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Xiaoying Yang
Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China

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Journal article
Published: 01 July 2020 in Science of The Total Environment
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The sulfur ions generated during the microbial treatment of sulfate wastewater could cause secondary pollution problem, however, the application of the biomineralization technique could convert sulfur ions into sulfide nanocomposites with diverse properties. This study constructed a multi-stage process for sulfate wastewater treatment and CdS nanocomposites (CdS-NCs) recovery by using biomineralization, which simultaneously achieved the removal of pollutants and recovery of functional nanocomposites. In this process, about 97% of the sulfate could be removed, and the CdS-NCs with a diameter of 16.0–20.2 nm were collected at different pHs. The results of FTIR and Raman proved that the biomacromolecules derived from microorganisms participated in the formation of CdS-NCs. The Mott-Schottky curve suggested that the CdS-NCs belonged to n-type semiconductors with the energy gap of 2.29–2.38 eV and could be applied as the photocatalyst, and up to 78.2% of 200 mg/L tetracycline was photodegraded catalytically by CdS-NCs obtained at pH 6.5. In the application of CdS-NCs as anodes of lithium-ion batteries, all the batteries assembled by CdS-NCs exhibited a very strong cycle performance of more than 500 cycles. This research not only effectively recovered nanocomposites with great application potential from sulfate wastewater but also provided a perspective for the utilization of recovered resources.

ACS Style

Wanqing Ren; Chunli Wan; Zhengwen Li; Xiang Liu; Ren Zhang; Xiaoying Yang; Duu-Jong Lee. Functional CdS nanocomposites recovered from biomineralization treatment of sulfate wastewater and its applications in the perspective of photocatalysis and electrochemistry. Science of The Total Environment 2020, 742, 140646 .

AMA Style

Wanqing Ren, Chunli Wan, Zhengwen Li, Xiang Liu, Ren Zhang, Xiaoying Yang, Duu-Jong Lee. Functional CdS nanocomposites recovered from biomineralization treatment of sulfate wastewater and its applications in the perspective of photocatalysis and electrochemistry. Science of The Total Environment. 2020; 742 ():140646.

Chicago/Turabian Style

Wanqing Ren; Chunli Wan; Zhengwen Li; Xiang Liu; Ren Zhang; Xiaoying Yang; Duu-Jong Lee. 2020. "Functional CdS nanocomposites recovered from biomineralization treatment of sulfate wastewater and its applications in the perspective of photocatalysis and electrochemistry." Science of The Total Environment 742, no. : 140646.

Journal article
Published: 23 May 2020 in Atmospheric Research
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The Ru River Basin is facing severe water security challenges such as frequent occurrence of extreme events and serious nutrient enrichment of its water bodies. In simulating daily streamflow, monthly total nitrogen (TN) loads, and monthly total phosphorous (TP) loads of the basin, the SWAT (Soil and Water Assessment Tool) model utilizing hourly rainfall inputs was found to perform considerably better than the model utilizing daily rainfall inputs. For climate change impact assessment, the hourly weather generator AWE-GEN was calibrated based on historical hourly rainfall records from 1970 to 1999 in the basin. Evaluation of its performance have indicated that the AWE-GEN could reasonably characterize the main features of monthly, daily, and hourly rainfall in the basin. The outputs of eight GCMs under a total of four climate change scenarios were then downscaled with the AWE-GEN to produce synthetic future hourly rainfall series to drive the hourly rainfall SWAT model for climate change impact assessment. The ensemble of SWAT simulation results have suggested that future streamflow, TN loads and TP loads were all likely to increase in the flood season in the Ru River Basin. Since the Ru River has already been afflicted with nutrient enrichment issues, the projected increase in nutrient loads due to climate change necessitates the enforcement of additional nutrient abatement measures to offset the adverse impacts imposed by climate change.

ACS Style

Xiaoying Yang; Ruimin He; Jinyin Ye; Mou Leong Tan; Xiyan Ji; Lit Tan; Guoqing Wang. Integrating an hourly weather generator with an hourly rainfall SWAT model for climate change impact assessment in the Ru River Basin, China. Atmospheric Research 2020, 244, 105062 .

AMA Style

Xiaoying Yang, Ruimin He, Jinyin Ye, Mou Leong Tan, Xiyan Ji, Lit Tan, Guoqing Wang. Integrating an hourly weather generator with an hourly rainfall SWAT model for climate change impact assessment in the Ru River Basin, China. Atmospheric Research. 2020; 244 ():105062.

Chicago/Turabian Style

Xiaoying Yang; Ruimin He; Jinyin Ye; Mou Leong Tan; Xiyan Ji; Lit Tan; Guoqing Wang. 2020. "Integrating an hourly weather generator with an hourly rainfall SWAT model for climate change impact assessment in the Ru River Basin, China." Atmospheric Research 244, no. : 105062.

Journal article
Published: 24 March 2020 in Remote Sensing
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Owing to their advantages of wide coverage and high spatiotemporal resolution, satellite precipitation products (SPPs) have been increasingly used as surrogates for traditional ground observations. In this study, we have evaluated the accuracy of the latest five GPM IMERG V6 and TRMM 3B42 V7 precipitation products across the monthly, daily, and hourly scale in the hilly Shuaishui River Basin in East-Central China. For evaluation, a total of four continuous and three categorical metrics have been calculated based on SPP estimates and historical rainfall records at 13 stations over a period of 9 years from 2009 to 2017. One-way analysis of variance (ANOVA) and multiple posterior comparison tests are used to assess the significance of the difference in SPP rainfall estimates. Our evaluation results have revealed a wide-ranging performance among the SPPs in estimating rainfall at different time scales. Firstly, two post-time SPPs (IMERG_F and 3B42) perform considerably better in estimating monthly rainfall. Secondly, with IMERG_F performing the best, the GPM products generally produce better daily rainfall estimates than the TRMM products. Thirdly, with their correlation coefficients all falling below 0.6, neither GPM nor TRMM products could estimate hourly rainfall satisfactorily. In addition, topography tends to impose similar impact on the performance of SPPs across different time scales, with more estimation deviations at high altitude. In general, the post-time IMERG_F product may be considered as a reliable data source of monthly or daily rainfall in the study region. Effective bias-correction algorithms incorporating ground rainfall observations, however, are needed to further improve the hourly rainfall estimates of the SPPs to ensure the validity of their usage in real-world applications.

ACS Style

Xiaoying Yang; Yang Lu; Mou Leong Tan; Xiaogang Li; Guoqing Wang; Ruimin He. Nine-Year Systematic Evaluation of the GPM and TRMM Precipitation Products in the Shuaishui River Basin in East-Central China. Remote Sensing 2020, 12, 1042 .

AMA Style

Xiaoying Yang, Yang Lu, Mou Leong Tan, Xiaogang Li, Guoqing Wang, Ruimin He. Nine-Year Systematic Evaluation of the GPM and TRMM Precipitation Products in the Shuaishui River Basin in East-Central China. Remote Sensing. 2020; 12 (6):1042.

Chicago/Turabian Style

Xiaoying Yang; Yang Lu; Mou Leong Tan; Xiaogang Li; Guoqing Wang; Ruimin He. 2020. "Nine-Year Systematic Evaluation of the GPM and TRMM Precipitation Products in the Shuaishui River Basin in East-Central China." Remote Sensing 12, no. 6: 1042.

Articles
Published: 27 February 2020 in Environmental Technology
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Mature landfill leachate usually contains high levels of both recalcitrant organic matters and nitrogen compounds, which are hard to be removed simultaneously. In view of the difficulty, this study explored an innovative alternative that treated organic matters and nitrogen compounds separately by combining ferric trichloride (FTC) and polyacrylamide (PAM) coagulation with activated coke adsorption. Our study results have shown that the combination of chemical coagulation (750 mg/L of ferric trichloride and 2.0 mg/L of anionic polyacrylamide at pH= 5) with activated coke adsorption (5 g per 100 mL) was able to remove total organic carbon (TOC), chemical oxygen demand (COD), and colority by 91%, 57%, 100%, respectively. The removal efficiency (R.E.) of humic- and protein-like matters both exceeded 95%. Meanwhile, nitrogen compounds, such as nitrite and ammonia nitrogen, were mostly retained in the effluent. They could either be recovered as value-added products through technologies such as negative pressure steam-stripping or removed through methods such as air stripping and ion exchange. Overall, the proposed coagulation-adsorption process may provide a feasible alternative for tackling the worldwide concern over the secondary pollution caused by mature landfill leachate and its effective disposal.

ACS Style

Jianying Xiong; Chen Zhang; Xiaoying Yang; Tao Zhou; Shujun Yang. Combining chemical coagulation with activated coke adsorption to remove organic matters and retain nitrogen compounds in mature landfill leachate. Environmental Technology 2020, 42, 3487 -3495.

AMA Style

Jianying Xiong, Chen Zhang, Xiaoying Yang, Tao Zhou, Shujun Yang. Combining chemical coagulation with activated coke adsorption to remove organic matters and retain nitrogen compounds in mature landfill leachate. Environmental Technology. 2020; 42 (22):3487-3495.

Chicago/Turabian Style

Jianying Xiong; Chen Zhang; Xiaoying Yang; Tao Zhou; Shujun Yang. 2020. "Combining chemical coagulation with activated coke adsorption to remove organic matters and retain nitrogen compounds in mature landfill leachate." Environmental Technology 42, no. 22: 3487-3495.

Journal article
Published: 27 August 2019 in Ecological Indicators
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Although multiple pollution sources could discharge significant nutrient loads within a river basin, few studies have attempted to analyze the spatiotemporal distribution patterns of nutrient pollution source compositions across a basin. Using the Xiaohong River Basin as a case example, this study aims to establish a feasible framework for characterizing the spatiotemporal patterns of regional pollution source compositions that could be implemented in watersheds worldwide. Firstly, SWAT (Soil and Water Assessment Tool) was used to simulate nutrient loads from all main human activities in the basin. Driven by hourly rainfall, the SWAT model was able to simulate both monthly total nitrogen (TN) and total phosphorous (TP) loads in the basin satisfactorily. Source attribution of TN and TP loads through SWAT scenario analysis combined with the k-means clustering analysis was then used to characterize the spatiotemporal distribution patterns in the nutrient pollution source compositions. A total of six types of TN pollution source compositions and five types of TP pollution source compositions have been identified across the region. In general, crop production dominated TN load contributions in 24 sub-basins along the main reach and upstream tributaries, concentrated animal feeding operations (CAFOs) joined crop production as the leading source in eight sub-basins, and wastewater treatment plants (WWTPs) and industry contributed significant TN loads in the remaining three sub-basins. For TP, crop production dominated load contributions in six sub-basins along the upstream tributaries, CAFOs and crop production dominated in 28 sub-basins, while WWTPs were the leading source in the remaining sub-basin. Therefore, implementing effective programs to promote the utilization of organic fertilizers from animal manure for crop production is essential to alleviate the serious nutrient pollution situation in the basin.

ACS Style

Ruimin He; Xiaoying Yang; Philip W. Gassman; Guoqing Wang; Chenyangzi Yu. Spatiotemporal characterization of nutrient pollution source compositions in the Xiaohong River Basin, China. Ecological Indicators 2019, 107, 105676 .

AMA Style

Ruimin He, Xiaoying Yang, Philip W. Gassman, Guoqing Wang, Chenyangzi Yu. Spatiotemporal characterization of nutrient pollution source compositions in the Xiaohong River Basin, China. Ecological Indicators. 2019; 107 ():105676.

Chicago/Turabian Style

Ruimin He; Xiaoying Yang; Philip W. Gassman; Guoqing Wang; Chenyangzi Yu. 2019. "Spatiotemporal characterization of nutrient pollution source compositions in the Xiaohong River Basin, China." Ecological Indicators 107, no. : 105676.

Review
Published: 01 May 2019 in Water
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The Soil and Water Assessment Tool (SWAT) model is recognized as one of the top hydrological models applied for addressing hydrologic and environmental issues. This is the first review on the SWAT model studies in Southeast Asia, with an emphasis on its applications, current challenges and future research directions. A total of 126 articles were identified since 2006; roughly 50% of these studies were conducted in Vietnam or Thailand. About 16% of the studies were performed at a transnational scale, which included Cambodia, Lao PDR, Thailand, and Vietnam. Model capability assessment, land use, and climate change assessment are the main SWAT applications that have been reported for the region. Most of the SWAT calibration and validation results for these studies were classified as satisfactory to very good results based on widely recognized performance indicators. However, the parameterization, calibration and validation procedures are not well reported in some articles. Availability of reliable data is one of the main problems that SWAT users are confronted with, as these data are either not freely available or restricted from public access in some countries. Hence, future studies should be considered on identification and development of reliable input data for SWAT modeling. SWAT model modification based on the SEA climate, geographical and land use conditions is another research direction to be considered in the future. Moreover, application of SWAT for extreme events simulation requires more attention in this region.

ACS Style

Mou Leong Tan; Philip W. Gassman; Raghavan Srinivasan; Jeffrey G. Arnold; Xiaoying Yang. A Review of SWAT Studies in Southeast Asia: Applications, Challenges and Future Directions. Water 2019, 11, 914 .

AMA Style

Mou Leong Tan, Philip W. Gassman, Raghavan Srinivasan, Jeffrey G. Arnold, Xiaoying Yang. A Review of SWAT Studies in Southeast Asia: Applications, Challenges and Future Directions. Water. 2019; 11 (5):914.

Chicago/Turabian Style

Mou Leong Tan; Philip W. Gassman; Raghavan Srinivasan; Jeffrey G. Arnold; Xiaoying Yang. 2019. "A Review of SWAT Studies in Southeast Asia: Applications, Challenges and Future Directions." Water 11, no. 5: 914.

Journal article
Published: 01 March 2019 in Journal of Environmental Engineering
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The use of aquatic plants has recently become a popular technique for ecological restoration and purification of eutrophic rivers and lakes. In this paper, various technologies were studied and designed against the background of research and demonstration projects for pollution control in Dianchi Lake and comprehensive improvement of water quality. Different technical units were designed in the horizontal and vertical spaces of the water body. Horizontal spaces included plant buffers on the surface, algae enrichment and diversion, innovative floating beds, and emerging plant zones at the shoreline. Vertical spaces include ecological floating beds, ecological jellyfish, and ecological membrane coverings. Spatial growth patterns of aquatic plants were constructed with rational use of water space and integration with various techniques to maximize the absorption of nutrients in the lake, increase the transparency of the water, and alleviate lake eutrophication. The previous technologies were combined, and technical demonstrations were conducted using experiments. We set up an integrated technical demonstration district with an area of 0.25 km2 on the north shore of Dianchi Lake, and the results demonstrated the following: water transparency increased by >50 cm; algae biomass decreased by >70%; and the percent removal of total phosphorous (TP), total nitrogen (TN), and chemical oxygen demand (CODMn) was >30%.

ACS Style

Zheng Zheng; Weizhen Zhang; Xingzhang Luo; Shoubing Wang; Xiaoying Yang; Jian He; Er Nie. Design and Application of Plant Ecological Space Technology in Water Eutrophication Control. Journal of Environmental Engineering 2019, 145, 04018142 .

AMA Style

Zheng Zheng, Weizhen Zhang, Xingzhang Luo, Shoubing Wang, Xiaoying Yang, Jian He, Er Nie. Design and Application of Plant Ecological Space Technology in Water Eutrophication Control. Journal of Environmental Engineering. 2019; 145 (3):04018142.

Chicago/Turabian Style

Zheng Zheng; Weizhen Zhang; Xingzhang Luo; Shoubing Wang; Xiaoying Yang; Jian He; Er Nie. 2019. "Design and Application of Plant Ecological Space Technology in Water Eutrophication Control." Journal of Environmental Engineering 145, no. 3: 04018142.

Journal article
Published: 20 December 2018 in Remote Sensing
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The satellite-observed nighttime light emission (NTLE) data provide a new method for scrutinizing the footprint of human settlements. Changing NTLEs can be attributed to the direct/indirect influences of highly complex factors that are beyond the ability of simple statistical models to distinguish. Besides, the relatively coarse resolution of the NTLE products combined with light from human settlements may produce misleading results, as the relationship between spatiotemporal heterogeneity in the growth of developed land (e.g., urban and rural residences, shopping centers, industrial parks, mining plants, and transportation facilities) and the associated NTLEs has not been adequately analyzed. In this study, we developed a total nighttime brightness index (TotalNTBI) to measure the NTLEs with the defense meteorological satellite program/operational linescan system (DMSP/OLS) nighttime light data enhanced by sharpening the edges of the pixels. Thirty-six key cities in China were selected to investigate the relationship between the total developed land area and the associated TotalNTBI from 2000 to 2013 using panel regression and a simplified structural equation model (SEM). The results show that the overall trend in TotalNTBI agreed well with that of the total developed land area (mean adjusted R2 = 0.799). The panel regression models explained approximately 71.8% of the variance of total developed land area and 92.4% of the variance in TotalNTBI. The SEM revealed both the direct and indirect influences of independent variables on the total developed land area and the associated TotalNTBI. This study may provide useful information for decision-makers and researchers engaged in sustainable land development, urban management, and regional developmental inequality, focusing on recent issues, such as retrospective analysis of human footprint with sharpened nighttime NTLE products, the loss of natural and semi-natural land due to the sprawling developed land area indicated by intensively lit area, and the low efficiency of land development indicated by the anomalies of developed land area and associated NTBIs.

ACS Style

Hui-Min Li; Xiao-Gang Li; Xiao-Ying Yang; Hao Zhang. Analyzing the Relationship between Developed Land Area and Nighttime Light Emissions of 36 Chinese Cities. Remote Sensing 2018, 11, 10 .

AMA Style

Hui-Min Li, Xiao-Gang Li, Xiao-Ying Yang, Hao Zhang. Analyzing the Relationship between Developed Land Area and Nighttime Light Emissions of 36 Chinese Cities. Remote Sensing. 2018; 11 (1):10.

Chicago/Turabian Style

Hui-Min Li; Xiao-Gang Li; Xiao-Ying Yang; Hao Zhang. 2018. "Analyzing the Relationship between Developed Land Area and Nighttime Light Emissions of 36 Chinese Cities." Remote Sensing 11, no. 1: 10.

Journal article
Published: 31 August 2018 in Journal of Cleaner Production
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Given the high ammonia nitrogen (NH3-N) concentration and low biological oxygen demand/chemical oxygen demand (BOD/COD) ratio (<0.1) in mature landfill leachate, it is hard to treat it with the membrane bioreactor (MBR) system to meet the discharge standard for Pollution Control of the Municipal Solid Waste Landfills” (GB16889-2008) without additional carbon source. This pilot-scale study evaluated the use of negative pressure steam-stripping technology for the pretreatment of mature landfill leachate. Our study results have shown that NH3-N concentrations of raw leachate and treated effluent from steam-stripping tower were respectively 2941–3648 mg/L and 401–710 mg/L, yielding an average NH3-N removal efficiency of 82.03%. Nitrogen (N) was recovered via the formation of NH4HCO3 in the ammonia recovery tower, and the effluent of steam-stripping tower was further treated by MBR system. Economic evaluation results showed that initial investment in pretreatment could be offset by respectively reducing energy consumption and operational costs of the MBR system by 60% and 80%. Furthermore, most of Ca2+ and Mg2+ in mature leachate was removed through the formation of CaCO3 and MgCO3 after pretreatment, which avoided membrane fouling and increased the membrane filtration efficiency of MBR system. To conclude, this pilot-study has indicated that negative pressure steam-stripping pretreatment is an efficient and cost-effective technology for the removal of NH3-N, making MBR technology viable without the need for additional carbon source.

ACS Style

Jianying Xiong; Zheng Zheng; Xiaoying Yang; Xiaodong Dai; Tao Zhou; Jian He; Xingzhang Luo. Recovery of NH3-N from mature leachate via negative pressure steam-stripping pretreatment and its benefits on MBR systems: A pilot scale study. Journal of Cleaner Production 2018, 203, 918 -925.

AMA Style

Jianying Xiong, Zheng Zheng, Xiaoying Yang, Xiaodong Dai, Tao Zhou, Jian He, Xingzhang Luo. Recovery of NH3-N from mature leachate via negative pressure steam-stripping pretreatment and its benefits on MBR systems: A pilot scale study. Journal of Cleaner Production. 2018; 203 ():918-925.

Chicago/Turabian Style

Jianying Xiong; Zheng Zheng; Xiaoying Yang; Xiaodong Dai; Tao Zhou; Jian He; Xingzhang Luo. 2018. "Recovery of NH3-N from mature leachate via negative pressure steam-stripping pretreatment and its benefits on MBR systems: A pilot scale study." Journal of Cleaner Production 203, no. : 918-925.

Journal article
Published: 22 August 2018 in Process Safety and Environmental Protection
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With a growing number of landfills reaching the mature stage, finding feasible alternatives for effective treatment of mature landfill leachate has become an imminent challenge for landfill management worldwide. Due to its special characteristics of low levels of biodegradable organic matters but extremely high levels of ammonia, removing nitrogen from mature landfill leachate is especially challenging. Focusing on the nitrification process, this study examined the nitrification efficiency of the moving bed biofilm reactor (MBBR) inoculated with biocarriers from a municipal wastewater treatment plant (MWTP). The MBBR was operated to treat mature landfill leachate over a period of 126 days to evaluate its nitrification efficiency in five phases with variable operation conditions in terms of running mode, hydraulic retention time, carbon source, duration of aeration and agitation, pH, and influent ammonia concentration. Our study results have indicated that the MBBR could tolerate the large fluctuations in ammonium concentrations at high levels and maintained a nitrification efficiency of above 60% under various operation conditions. The abundance of ammonia-oxidizing bacteria such as β-Proteobacteria and nitrite-oxidizing bacteria such as α-Proteobacteria in the biofilm sludge facilitated the nitrification process in the MBBR. As more MWTPs are expected to install MBBRs in the near future, inoculating the MBBR with biocarriers from MWTPs for mature landfill leachate treatment may provide a viable solution to the imminent risk of secondary landfill leachate pollution in China, and possibly other countries around the world.

ACS Style

Jianying Xiong; Zheng Zheng; Xiaoying Yang; Jian He; Xingzhang Luo; Bin Gao. Mature landfill leachate treatment by the MBBR inoculated with biocarriers from a municipal wastewater treatment plant. Process Safety and Environmental Protection 2018, 119, 304 -310.

AMA Style

Jianying Xiong, Zheng Zheng, Xiaoying Yang, Jian He, Xingzhang Luo, Bin Gao. Mature landfill leachate treatment by the MBBR inoculated with biocarriers from a municipal wastewater treatment plant. Process Safety and Environmental Protection. 2018; 119 ():304-310.

Chicago/Turabian Style

Jianying Xiong; Zheng Zheng; Xiaoying Yang; Jian He; Xingzhang Luo; Bin Gao. 2018. "Mature landfill leachate treatment by the MBBR inoculated with biocarriers from a municipal wastewater treatment plant." Process Safety and Environmental Protection 119, no. : 304-310.

Journal article
Published: 01 February 2018 in Science of The Total Environment
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It is increasingly recognized that climate change could affect the quality of water through complex natural and anthropogenic mechanisms. Previous studies on climate change and water quality have mostly focused on assessing its impact on pollutant loads from agricultural runoff. A sub-daily SWAT model was developed to simulate the discharge, transport, and transformation of nitrogen from all known anthropogenic sources including industries, municipal sewage treatment plants, concentrated and scattered feedlot operations, rural households, and crop production in the Upper Huai River Basin. This is a highly polluted basin with total nitrogen (TN) concentrations frequently exceeding Class V of the Chinese Surface Water Quality Standard (GB3838-2002). Climate change projections produced by 16 Global Circulation Models (GCMs) under the RCP 4.5 and RCP 8.5 scenarios in the mid (2040-2060) and late (2070-2090) century were used to drive the SWAT model to evaluate the impacts of climate change on both the TN loads and the effectiveness of three water pollution control measures (reducing fertilizer use, constructing vegetative filter strips, and improving septic tank performance) in the basin. SWAT simulation results have indicated that climate change is likely to cause an increase in both monthly average and extreme TN loads in February, May, and November. The projected impact of climate change on TN loads in August is more varied between GCMs. In addition, climate change is projected to have a negative impact on the effectiveness of septic tanks in reducing TN loads, while its impacts on the other two measures are more uncertain. Despite the uncertainty, reducing fertilizer use remains the most effective measure for reducing TN loads under different climate change scenarios. Meanwhile, improving septic tank performance is relatively more effective in reducing annual TN loads, while constructing vegetative filter strips is more effective in reducing annual maximum monthly TN loads.

ACS Style

Xiaoying Yang; Rachel Warren; Yi He; Jinyin Ye; Qiaoling Li; Guoqing Wang. Impacts of climate change on TN load and its control in a River Basin with complex pollution sources. Science of The Total Environment 2018, 615, 1155 -1163.

AMA Style

Xiaoying Yang, Rachel Warren, Yi He, Jinyin Ye, Qiaoling Li, Guoqing Wang. Impacts of climate change on TN load and its control in a River Basin with complex pollution sources. Science of The Total Environment. 2018; 615 ():1155-1163.

Chicago/Turabian Style

Xiaoying Yang; Rachel Warren; Yi He; Jinyin Ye; Qiaoling Li; Guoqing Wang. 2018. "Impacts of climate change on TN load and its control in a River Basin with complex pollution sources." Science of The Total Environment 615, no. : 1155-1163.

Research article
Published: 26 September 2017 in Environmental Science and Pollution Research
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It is increasingly recognized that climate change could impose both direct and indirect impacts on the quality of the water environment. Previous studies have mostly concentrated on evaluating the impacts of climate change on non-point source pollution in agricultural watersheds. Few studies have assessed the impacts of climate change on the water quality of river basins with complex point and non-point pollution sources. In view of the gap, this paper aims to establish a framework for stochastic assessment of the sensitivity of water quality to future climate change in a river basin with complex pollution sources. A sub-daily soil and water assessment tool (SWAT) model was developed to simulate the discharge, transport, and transformation of nitrogen from multiple point and non-point pollution sources in the upper Huai River basin of China. A weather generator was used to produce 50 years of synthetic daily weather data series for all 25 combinations of precipitation (changes by − 10, 0, 10, 20, and 30%) and temperature change (increases by 0, 1, 2, 3, and 4 °C) scenarios. The generated daily rainfall series was disaggregated into the hourly scale and then used to drive the sub-daily SWAT model to simulate the nitrogen cycle under different climate change scenarios. Our results in the study region have indicated that (1) both total nitrogen (TN) loads and concentrations are insensitive to temperature change; (2) TN loads are highly sensitive to precipitation change, while TN concentrations are moderately sensitive; (3) the impacts of climate change on TN concentrations are more spatiotemporally variable than its impacts on TN loads; and (4) wide distributions of TN loads and TN concentrations under individual climate change scenario illustrate the important role of climatic variability in affecting water quality conditions. In summary, the large variability in SWAT simulation results within and between each climate change scenario highlights the uncertainty of the impacts of climate change and the need to incorporate extreme conditions in managing water environment and developing climate change adaptation and mitigation strategies.

ACS Style

Xiaoying Yang; Lit Tan; Ruimin He; Guangtao Fu; Jinyin Ye; Qun Liu; Guoqing Wang. Stochastic sensitivity analysis of nitrogen pollution to climate change in a river basin with complex pollution sources. Environmental Science and Pollution Research 2017, 24, 26545 -26561.

AMA Style

Xiaoying Yang, Lit Tan, Ruimin He, Guangtao Fu, Jinyin Ye, Qun Liu, Guoqing Wang. Stochastic sensitivity analysis of nitrogen pollution to climate change in a river basin with complex pollution sources. Environmental Science and Pollution Research. 2017; 24 (34):26545-26561.

Chicago/Turabian Style

Xiaoying Yang; Lit Tan; Ruimin He; Guangtao Fu; Jinyin Ye; Qun Liu; Guoqing Wang. 2017. "Stochastic sensitivity analysis of nitrogen pollution to climate change in a river basin with complex pollution sources." Environmental Science and Pollution Research 24, no. 34: 26545-26561.

Journal article
Published: 01 May 2016 in Water Research
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Environmental problems such as eutrophication caused by excessive nutrient discharge are global challenges. There are complex pollution sources of nitrogen (N) discharge in many river basins worldwide. Knowledge of its pollution sources and their respective load contributions is essential to developing effective N pollution control strategies. N loads from all known anthropogenic pollution sources in the Upper Huai River basin of China were simulated with the process-based SWAT (Soil and Water Assessment Tool) model. The performances of SWAT driven by daily and hourly rainfall inputs were assessed and it was found that the one driven by hourly rainfall outperformed the one driven by daily rainfall in simulating both total nitrogen (TN) and ammonia nitrogen (NH4-N) loads. The hourly SWAT model was hence used to examine the spatiotemporal patterns of TN and NH4-N loads and their source attributions. TN load exhibited significant seasonal variations with the largest in summer and the smallest in spring. Despite its declining proportion of contribution downstream, crop production remained the largest contributor of TN load followed by septic tanks, concentrated animal feedlot operations (CAFOs), municipal sewage treatment plants, industries, and scattered animal feedlot operations (SAFOs). There was much less seasonal variation in NH4-N load. CAFOs remained the largest source of NH4-N load throughout the basin, while contributions from industries and municipal sewage treatment plants were more evident downstream. Our study results suggest the need to shift the focus of N load reduction from “end-of-pipe” sewage treatment to an integrated approach emphasizing stakeholder involvement and source prevention.

ACS Style

Xiaoying Yang; Qun Liu; Guangtao Fu; Yi He; Xingzhang Luo; Zheng Zheng. Spatiotemporal patterns and source attribution of nitrogen load in a river basin with complex pollution sources. Water Research 2016, 94, 187 -199.

AMA Style

Xiaoying Yang, Qun Liu, Guangtao Fu, Yi He, Xingzhang Luo, Zheng Zheng. Spatiotemporal patterns and source attribution of nitrogen load in a river basin with complex pollution sources. Water Research. 2016; 94 ():187-199.

Chicago/Turabian Style

Xiaoying Yang; Qun Liu; Guangtao Fu; Yi He; Xingzhang Luo; Zheng Zheng. 2016. "Spatiotemporal patterns and source attribution of nitrogen load in a river basin with complex pollution sources." Water Research 94, no. : 187-199.

Journal article
Published: 18 March 2016 in International Journal of Environmental Research and Public Health
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Many water quality models have been successfully used worldwide to predict nutrient losses from anthropogenically impacted catchments, but hydrological and nutrient simulations with limited data are difficult considering the transfer of model parameters and complication of model calibration and validation. This study aims: (i) to assess the performance capabilities of a new and relatively more advantageous model, namely, Hydrological Predictions for the Environment (HYPE), that simulates stream flow and nutrient load in agricultural areas by using a multi-site and multi-objective parameter calibration method and (ii) to investigate the temporal and spatial variations of total nitrogen (TN) and total phosphorous (TP) concentrations and loads with crop rotation by using the model for the first time. A parameter estimation tool (PEST) was used to calibrate parameters. Results show that the parameters related to the effective soil porosity were highly sensitive to hydrological modeling. N balance was largely controlled by soil denitrification processes. P balance was influenced by the sedimentation rate and production/decay of P in rivers and lakes. The model reproduced the temporal and spatial variations of discharge and TN/TP relatively well in both calibration (2006–2008) and validation (2009–2010) periods. Among the obtained data, the lowest Nash-Suttclife efficiency of discharge, daily TN load, and daily TP load were 0.74, 0.51, and 0.54, respectively. The seasonal variations of daily TN concentrations in the entire simulation period were insufficient, indicated that crop rotation changed the timing and amount of N output. Monthly TN and TP simulation yields revealed that nutrient outputs were abundant in summer in terms of the corresponding discharge. The area-weighted TN and TP load annual yields in five years showed that nutrient loads were extremely high along Hong and Ru rivers, especially in agricultural lands.

ACS Style

Yunxing Yin; SanYuan Jiang; Charlotta Pers; Xiaoying Yang; Qun Liu; Jin Yuan; Mingxing Yao; Yi He; Xingzhang Luo; Zheng Zheng. Assessment of the Spatial and Temporal Variations of Water Quality for Agricultural Lands with Crop Rotation in China by Using a HYPE Model. International Journal of Environmental Research and Public Health 2016, 13, 336 .

AMA Style

Yunxing Yin, SanYuan Jiang, Charlotta Pers, Xiaoying Yang, Qun Liu, Jin Yuan, Mingxing Yao, Yi He, Xingzhang Luo, Zheng Zheng. Assessment of the Spatial and Temporal Variations of Water Quality for Agricultural Lands with Crop Rotation in China by Using a HYPE Model. International Journal of Environmental Research and Public Health. 2016; 13 (3):336.

Chicago/Turabian Style

Yunxing Yin; SanYuan Jiang; Charlotta Pers; Xiaoying Yang; Qun Liu; Jin Yuan; Mingxing Yao; Yi He; Xingzhang Luo; Zheng Zheng. 2016. "Assessment of the Spatial and Temporal Variations of Water Quality for Agricultural Lands with Crop Rotation in China by Using a HYPE Model." International Journal of Environmental Research and Public Health 13, no. 3: 336.

Journal article
Published: 08 December 2015 in Hydrological Processes
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Zheng Zheng; Junqi Gao; Zhen Ma; Zhengfang Wang; Xiaoying Yang; Xingzhang Luo; Thierry Jacquet; Guangtao Fu. Urban flooding in China: main causes and policy recommendations. Hydrological Processes 2015, 30, 1149 -1152.

AMA Style

Zheng Zheng, Junqi Gao, Zhen Ma, Zhengfang Wang, Xiaoying Yang, Xingzhang Luo, Thierry Jacquet, Guangtao Fu. Urban flooding in China: main causes and policy recommendations. Hydrological Processes. 2015; 30 (7):1149-1152.

Chicago/Turabian Style

Zheng Zheng; Junqi Gao; Zhen Ma; Zhengfang Wang; Xiaoying Yang; Xingzhang Luo; Thierry Jacquet; Guangtao Fu. 2015. "Urban flooding in China: main causes and policy recommendations." Hydrological Processes 30, no. 7: 1149-1152.

Journal article
Published: 01 December 2015 in Atmospheric Research
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Located in a transition zone between the northern and southern climates in China, the Huai River Basin is prone to extreme events such as drought and flood. Based on the daily precipitation data at 134 stations between 1961 and 2013, this paper analyzed the spatial and temporal patterns of the dry and wet conditions in the Huai River Basin through the statistical analysis of the rainfall stations' annual and seasonal standard precipitation index (SPI) series. Annual SPI series exhibited a decreasing trend at 86 stations and an increasing trend at the remaining stations. None of the increasing trend was significant, while the decreasing trend was significant at two stations at 5% significance level (α = 0.05) and one station at 10% level. Seasonal-wise, there has been a prevailing trend of drying in spring and autumn, and wetting in summer and winter. The trends in the spring and summer SPI series have been mostly insignificant, while those in autumn and winter, significant (α = 0.10) at over 30 stations. The Pettitt test results indicated that the significant transitions (α = 0.10) in the autumn and winter SPI series mostly occurred in the middle to late 1980s. Comparison of the average number of dry and wet years between the two sub-periods of 1961–1984 and 1990–2013 suggested a significant increase (α = 0.05) in the average number of severely wet years across much of the basin. Overall, significant changes have already occurred in the dry and wet conditions of the Huai River Basin, which could have profound impacts on the food and water safety situation of the region

ACS Style

Yi He; Jinyin Ye; Xiaoying Yang. Analysis of the spatio-temporal patterns of dry and wet conditions in the Huai River Basin using the standardized precipitation index. Atmospheric Research 2015, 166, 120 -128.

AMA Style

Yi He, Jinyin Ye, Xiaoying Yang. Analysis of the spatio-temporal patterns of dry and wet conditions in the Huai River Basin using the standardized precipitation index. Atmospheric Research. 2015; 166 ():120-128.

Chicago/Turabian Style

Yi He; Jinyin Ye; Xiaoying Yang. 2015. "Analysis of the spatio-temporal patterns of dry and wet conditions in the Huai River Basin using the standardized precipitation index." Atmospheric Research 166, no. : 120-128.

Journal article
Published: 01 September 2015 in Environmental Engineering Science
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Degradation of ibuprofen (IBP) at two concentrations (0.05 and 0.1 mM) through ultrasonic irradiation at 585 kHz was studied under the air-, oxygen-, argon-, and nitrogen-saturated conditions. Effects of H2O2 on the degradation of IBP were also studied. Addition of hydroxyl radical scavengers (isopropyl alcohol and terephthalic acid) was used to derive and compare the reaction constants of IBP in the three zones (the cavitation bubble, the bulk solution, and the supercritical interface) formed during ultrasonic irradiation. Some results are as follows: first, degradation pathways proceed through first-order kinetics in all experiments by ultrasonic irradiation; second, IBP degradation rate was faster at the lower IBP concentration of 0.05 mM; third, additions of H2O2 from 0 to 5 mM could accelerate the degradation of IBP. In addition, degradation of IBP by γ-radiolysis was also compared to the degradation by ultrasonic irradiation under the air-, nitrous oxide-, and argon-saturated conditions. Results indicated that IBP degradation per unit energy during ultrasonic irradiation was only about 0.01% of that in γ-radiolysis at both IBP concentrations. Pathways of IBP degradation in both ultrasonic irradiation and γ-radiolysis were proposed based on liquid chromatography–mass spectrometry analysis, which mainly differed in the exclusive formation of two 5-membered ring products in γ-radiolysis.

ACS Style

Er Nie; Qun Liu; Zhengfang Wang; Jihua Li; Xiaoying Yang; Xing Zhang Luo; Zheng Zheng. Degradation of Ibuprofen by Ultrasonic Irradiation and γ-Radiolysis: Kinetic Studies and Degradation Pathways. Environmental Engineering Science 2015, 32, 773 -780.

AMA Style

Er Nie, Qun Liu, Zhengfang Wang, Jihua Li, Xiaoying Yang, Xing Zhang Luo, Zheng Zheng. Degradation of Ibuprofen by Ultrasonic Irradiation and γ-Radiolysis: Kinetic Studies and Degradation Pathways. Environmental Engineering Science. 2015; 32 (9):773-780.

Chicago/Turabian Style

Er Nie; Qun Liu; Zhengfang Wang; Jihua Li; Xiaoying Yang; Xing Zhang Luo; Zheng Zheng. 2015. "Degradation of Ibuprofen by Ultrasonic Irradiation and γ-Radiolysis: Kinetic Studies and Degradation Pathways." Environmental Engineering Science 32, no. 9: 773-780.

Original paper
Published: 17 June 2015 in Stochastic Environmental Research and Risk Assessment
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Despite the significant role of precipitation in the hydrological cycle, few studies have been conducted to evaluate the impacts of the temporal resolution of rainfall inputs on the performance of SWAT (soil and water assessment tool) models in large-sized river basins. In this study, both daily and hourly rainfall observations at 28 rainfall stations were used as inputs to SWAT for daily streamflow simulation in the Upper Huai River Basin. Study results have demonstrated that the SWAT model with hourly rainfall inputs performed better than the model with daily rainfall inputs in daily streamflow simulation, primarily due to its better capability of simulating peak flows during the flood season. The sub-daily SWAT model estimated that 58 % of streamflow was contributed by baseflow compared to 34 % estimated by the daily model. Using the future daily and 3-h precipitation projections under the RCP (Representative Concentration Pathways) 4.5 scenario as inputs, the sub-daily SWAT model predicted a larger amount of monthly maximum daily flow during the wet years than the daily model. The differences between the daily and sub-daily SWAT model simulation results indicated that temporal rainfall resolution could have much impact on the simulation of hydrological process, streamflow, and consequently pollutant transport by SWAT models. There is an imperative need for more studies to examine the effects of temporal rainfall resolution on the simulation of hydrological and water pollutant transport processes by SWAT in river basins of different environmental conditions.

ACS Style

Xiaoying Yang; Qun Liu; Yi He; Xingzhang Luo; Xiaoxiang Zhang. Comparison of daily and sub-daily SWAT models for daily streamflow simulation in the Upper Huai River Basin of China. Stochastic Environmental Research and Risk Assessment 2015, 30, 959 -972.

AMA Style

Xiaoying Yang, Qun Liu, Yi He, Xingzhang Luo, Xiaoxiang Zhang. Comparison of daily and sub-daily SWAT models for daily streamflow simulation in the Upper Huai River Basin of China. Stochastic Environmental Research and Risk Assessment. 2015; 30 (3):959-972.

Chicago/Turabian Style

Xiaoying Yang; Qun Liu; Yi He; Xingzhang Luo; Xiaoxiang Zhang. 2015. "Comparison of daily and sub-daily SWAT models for daily streamflow simulation in the Upper Huai River Basin of China." Stochastic Environmental Research and Risk Assessment 30, no. 3: 959-972.

Journal article
Published: 09 May 2015 in Environmental Biology of Fishes
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This study investigated the flocculation of Microcystis aeruginosa by steel slag and evaluated the safety of treated water. The results showed that algal cells at a steel slag dosage of 0.48 g L−1 were effectively removed from two diluted algal solutions when their algogenic organic matter (AOM) contents were 3.54 and 5.81 mg L−1 (referred to as S1 and S2) with algae removal rates of 93.8 and 92.6 %, respectively. Simultaneously, the concentrations of AOM were reduced in S1 and S2 with removal efficiencies of 72.6 and 70.2 %, respectively. Charge neutralisation and bridging were probably the mechanisms that accelerated the flocculation processes. However, AOM had a priority over the algae in the reaction with the steel slag by producing protein complexation, which adversely affected coagulation and increased coagulant demand. Increased K+ and AOM after flocculation indicated that cell damage occurred at a retention time of 36 h. However, acute toxicity test demonstrated that the inhibition rate did not significantly increase until the retention time reached 48 h. Overall, steel slag has a great potential as a low-cost alternative to control algal bloom and restore aquatic ecosystems.

ACS Style

Jihua Li; Xin Cao; Zhigang Ge; Xiaoying Yang; Zheng Zheng. Flocculation of Microcystis aeruginosa by steel slag and its safety evaluation. Environmental Biology of Fishes 2015, 28, 261 -268.

AMA Style

Jihua Li, Xin Cao, Zhigang Ge, Xiaoying Yang, Zheng Zheng. Flocculation of Microcystis aeruginosa by steel slag and its safety evaluation. Environmental Biology of Fishes. 2015; 28 (1):261-268.

Chicago/Turabian Style

Jihua Li; Xin Cao; Zhigang Ge; Xiaoying Yang; Zheng Zheng. 2015. "Flocculation of Microcystis aeruginosa by steel slag and its safety evaluation." Environmental Biology of Fishes 28, no. 1: 261-268.

Journal article
Published: 20 February 2015 in Ambio
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Face-to-face interviews (n = 553) were conducted in five counties in East-Central China to study farmers' fertilizer application behaviors, decision-making processes, attitudes towards adopting better fertilizer application technologies, and environmental consciousness. The survey results revealed widespread fertilizer misapplication and highly variable application behaviors in the study regions. The lack of scientific knowledge on fertilizers and the absence of guidance from agricultural extension services have forced the farmers to rely on personal judgment and advice from fertilizer dealers and friends to make decisions in fertilizer application. Overall, farmers have been idiosyncratic in fertilizer application with limited adoption of better fertilizer application technologies. There are great potentials for reducing pollutant load from agricultural runoff through promoting scientific fertilizer application in the regions. However, farmers' diverse preferences over agricultural extension programs necessitate an integrated approach emphasizing farmer involvement throughout the development of such programs for promoting better fertilizer application practices.

ACS Style

Xiaoying Yang; Shubo Fang. Practices, perceptions, and implications of fertilizer use in East-Central China. Ambio 2015, 44, 647 -652.

AMA Style

Xiaoying Yang, Shubo Fang. Practices, perceptions, and implications of fertilizer use in East-Central China. Ambio. 2015; 44 (7):647-652.

Chicago/Turabian Style

Xiaoying Yang; Shubo Fang. 2015. "Practices, perceptions, and implications of fertilizer use in East-Central China." Ambio 44, no. 7: 647-652.