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CH4 flux measured by a portable chamber using an infrared analyzer was compared with the flux by static chamber measurement for CW at 13 different sites from May 2012 to May 2017 in the Living Water Garden (LWG) in Chengdu, Sichuan Province, China, over 4 timescales (daily, monthly, seasonal, and annual). During the measurement period, a total of 1443 data were collected. CH4 fluxes were measured using the portable chamber method and the results showed that the annual mean and median CH4 flux values in the LWG were 17.4 mg m−2 h−1 and 6.2 mg m−2 h−1, respectively, ranging from − 19.7 to 98.0 mg m−2 h−1. Cumulative CH4 emissions for LWG ranged from − 0.17 to 0.86 kg m−2 year−1. Global warming potential (GWP, 25.7 kg CO2eq m−2 year−1) was at a high level, which means that the LWG was a source of CH4 emissions. Significant temporal variations on the 4 timescales were observed. And the asymmetry of measurement uncertainty of CH4 flux increases with the timescale. Although the total mean CH4 flux measured by the portable chamber method was 42.1% lower than that of the static chamber method, the temporal variation trends of CH4 flux were similar. The uncertainty of CH4 flux measured in portable chamber was more symmetrical than that in static chamber. These results suggest that the portable chamber method has considerable value as a long-term measurement method for CH4 flux temporal variations.
Ru Xue; Xiaoling Liu; Xiaoying Fu; Hongbing Luo; Ke Zhang; Bruce C. Anderson; Mei Li; Bo Huang; Lijuan Yu; Xiaoting Li; Shuzhi Fu; Aiping Pu; Liangqian Fan; Wei Chen. Characteristics of methane emissions in the Living Water Garden in Chengdu City from 2012 to 2017. Environmental Science and Pollution Research 2020, 27, 39531 -39546.
AMA StyleRu Xue, Xiaoling Liu, Xiaoying Fu, Hongbing Luo, Ke Zhang, Bruce C. Anderson, Mei Li, Bo Huang, Lijuan Yu, Xiaoting Li, Shuzhi Fu, Aiping Pu, Liangqian Fan, Wei Chen. Characteristics of methane emissions in the Living Water Garden in Chengdu City from 2012 to 2017. Environmental Science and Pollution Research. 2020; 27 (31):39531-39546.
Chicago/Turabian StyleRu Xue; Xiaoling Liu; Xiaoying Fu; Hongbing Luo; Ke Zhang; Bruce C. Anderson; Mei Li; Bo Huang; Lijuan Yu; Xiaoting Li; Shuzhi Fu; Aiping Pu; Liangqian Fan; Wei Chen. 2020. "Characteristics of methane emissions in the Living Water Garden in Chengdu City from 2012 to 2017." Environmental Science and Pollution Research 27, no. 31: 39531-39546.
In the study, an activated carbon was prepared by co-pyrolyzing rice straw and sewage sludge with ZnCl2 activation (SS-RS AC) and used to remove Cr(VI) from wastewater. Firstly, for the preparation of SS-RS AC, the yield and iodine number were used to determine the appropriate addition percentage of rice straw. Then, a series of batch experiments including initial pH, adsorption kinetics and isotherms, and ionic strength as well as Fourier transform infrared (FT-IR) analysis of SS-RS AC before and after adsorption were performed to explore the Cr(VI) adsorption removal behavior and mechanism of SS-RS AC prepared from sewage sludge with the appropriate rice straw addition percentage. The results showed that the appropriate addition percentage of rice straw was 20%. For the Cr(VI) adsorption removal with SS-RS AC, the initial pH of solution significantly influenced the removal efficient. The highest efficiency of Cr(VI) adsorption removal (97.7%) could be attained at pH 2.0. The adsorption kinetics and isotherm data were best fitted by the pseudo-second-order model and the Langmuir-Freundlich model, respectively. The prepared SS-RS AC had the maximum Cr(VI) adsorption removal capacity of 138.69 mg/g at 40 °C. The main mechanisms for the Cr(VI) removal with SS-RS AC involve the electrostatic attraction and the reduction of Cr(VI). Carboxy, amine, and hydroxyl groups were found to act as electron donor groups, contributing to the reduction of Cr(VI). The ionic strength had an adverse effect on the Cr(VI) removal. Overall, the prepared SS-RS AC can be used as an alternative and low-cost adsorbent for the removal of Cr(VI).
Liangqian Fan; Wenxin Wan; Xianda Wang; Jie Cai; Fenghui Chen; Wei Chen; Lin Ji; Hongbing Luo; Lin Cheng. Adsorption Removal of Cr(VI) with Activated Carbon Prepared by Co-pyrolysis of Rice Straw and Sewage Sludge with ZnCl2 Activation. Water, Air, & Soil Pollution 2019, 230, 233 .
AMA StyleLiangqian Fan, Wenxin Wan, Xianda Wang, Jie Cai, Fenghui Chen, Wei Chen, Lin Ji, Hongbing Luo, Lin Cheng. Adsorption Removal of Cr(VI) with Activated Carbon Prepared by Co-pyrolysis of Rice Straw and Sewage Sludge with ZnCl2 Activation. Water, Air, & Soil Pollution. 2019; 230 (10):233.
Chicago/Turabian StyleLiangqian Fan; Wenxin Wan; Xianda Wang; Jie Cai; Fenghui Chen; Wei Chen; Lin Ji; Hongbing Luo; Lin Cheng. 2019. "Adsorption Removal of Cr(VI) with Activated Carbon Prepared by Co-pyrolysis of Rice Straw and Sewage Sludge with ZnCl2 Activation." Water, Air, & Soil Pollution 230, no. 10: 233.
This work aims to investigate the methane emissions from integrated vertical-flow constructed wetlands (IVCWs) when ethanol is added as an external carbon source. In this study, a gradient of ethanol (0, 2, 4, 8, 16 and 32 mmol/L) was added as the carbon source in an IVCW planted with Cyperus alternifolius L. The results showed that the methane emission flux at an ethanol concentration of 32 mmol/L was 32.34 g CH4 m−2 day−1 less than that of the control experiment (0 mmol/L) and that the methane emission flux at an ethanol concentration of 16 mmol/L was 5.53 g CH4 m−2 day−1 less than that at 0 mmol/L. In addition, variations in the water quality driven by the different ethanol concentrations were found, with a redox potential range of −64 mV to +30 mV, a pH range of 6.6–6.9, a chemical oxygen demand (COD) removal rate range of 41% to 78%, and an ammonia nitrogen removal rate range of 59% to 82% after the ethanol addition. With the average CH4-C/TOC (%) value of 35% driven by ethanol, it will be beneficial to understand that CH4-C/TOC can be considered an ecological indicator of anthropogenic methanogenesis from treatment wetlands when driven by carbon sources or carbon loading. It can be concluded that adding ethanol as an external carbon source can not only meet the water quality demand of the IVCW treatment system but also stimulate and increase the average CH4 emissions from IVCWs by 23% compared with the control experiment. This finding indicates that an external carbon source can stimulate more CH4 emissions from IVCWs and shows the importance of carbon sources during sewage treatment processes when considering greenhouse emissions from treated wetlands.
Xiaoling Liu; Jingting Wang; Xiaoying Fu; Hongbing Luo; Bruce C. Anderson; Ke Zhang; Mei Li; Bo Huang; Liangqian Fan; Lijuan Yu; Guozhu He; Likou Zou; Shuzhi Fu; Limei Hu; Mingshu Jiang. Methane Emissions Driven by Adding a Gradient of Ethanol as Carbon Source in Integrated Vertical-Flow Constructed Wetlands. Water 2019, 11, 1086 .
AMA StyleXiaoling Liu, Jingting Wang, Xiaoying Fu, Hongbing Luo, Bruce C. Anderson, Ke Zhang, Mei Li, Bo Huang, Liangqian Fan, Lijuan Yu, Guozhu He, Likou Zou, Shuzhi Fu, Limei Hu, Mingshu Jiang. Methane Emissions Driven by Adding a Gradient of Ethanol as Carbon Source in Integrated Vertical-Flow Constructed Wetlands. Water. 2019; 11 (5):1086.
Chicago/Turabian StyleXiaoling Liu; Jingting Wang; Xiaoying Fu; Hongbing Luo; Bruce C. Anderson; Ke Zhang; Mei Li; Bo Huang; Liangqian Fan; Lijuan Yu; Guozhu He; Likou Zou; Shuzhi Fu; Limei Hu; Mingshu Jiang. 2019. "Methane Emissions Driven by Adding a Gradient of Ethanol as Carbon Source in Integrated Vertical-Flow Constructed Wetlands." Water 11, no. 5: 1086.
To understand the effects of effective microorganisms (EMs) containing multiple strains on microbes and nutrients in kiwifruit planting soil, EMs prepared with four different strains were added to kiwifruit planting soil monthly from April to August. The counts of bacteria, fungi, actinomycetes, and total microbes were determined. The pH, total nitrogen (TN), alkali-hydrolyzable nitrogen (A-N), organic matter (OM), available potassium (A-K), and available phosphorus (A-P) of the soil were measured. Results indicated that the counts of bacteria, fungi, actinomycetes, and total microbes reached 60.33 × 105, 4.00 × 105, 0.92 × 105, and 65.25 × 105 CFU/g, respectively, in August, all of which were higher than those of the control group (CK). The bacterial count of the experimental group (EG) was higher than that of the CK in August. The pH-values of the EG were always lower than those of the CK. In August, the TN content of the EG was 1.52 g/kg, which was higher than that of the CK (1.35 g/kg). A significant negative association between the actinomycetes count and TN (p < 0.05) was found. For A-N and OM, the content of the EG (A-N, 125.18 mg/kg; OM, 49.84 mg/kg) was roughly the same as that of the CK (A-N, 112.51 mg/kg; OM, 53.11 mg/kg) in August. However, the A-K and A-P contents of the EG (A-K, 145.25 mg/kg; A-P, 111.25 mg/kg) were lower than those of the CK (A-K, 182.52 mg/kg; A-P, 202.19 mg/kg) in August. Results show that application of EMs in kiwifruit planting soil can increase the counts of soil microbes and might promote the absorption of major nutrients for kiwifruit tree.
Liangqian Fan; Xi Zhou; Yongsheng Li; Lin Ji; Guoyan Wu; Bei Li; Lin Cheng; Mei Long; Wenwen Deng; Likou Zou. The Influence of Effective Microorganisms on Microbes and Nutrients in Kiwifruit Planting Soil. Applied Sciences 2016, 6, 168 .
AMA StyleLiangqian Fan, Xi Zhou, Yongsheng Li, Lin Ji, Guoyan Wu, Bei Li, Lin Cheng, Mei Long, Wenwen Deng, Likou Zou. The Influence of Effective Microorganisms on Microbes and Nutrients in Kiwifruit Planting Soil. Applied Sciences. 2016; 6 (6):168.
Chicago/Turabian StyleLiangqian Fan; Xi Zhou; Yongsheng Li; Lin Ji; Guoyan Wu; Bei Li; Lin Cheng; Mei Long; Wenwen Deng; Likou Zou. 2016. "The Influence of Effective Microorganisms on Microbes and Nutrients in Kiwifruit Planting Soil." Applied Sciences 6, no. 6: 168.
To provide the basic information about the release of heavy metals from the pyrite tailings of Huangjiagou pyrite mine, the pyrite tailings were investigated through a series of batch experiments under different initial pH of extractant, temperature, liquid-solid (LS) ratio, and soaking time conditions. Moreover, calcium carbonate was added in the pyrite tailings to determine the reduction effect on the release of heavy metals. The results show that Fe, Cr, Cu, Mn, Zn, and Ni were the major heavy metals in the pyrite tailings. Low initial pH and high LS ratio significantly promoted Fe, Cu, Mn, Ni, and Zn release, and high temperature significantly promoted Fe, Cu, Mn, and Ni release. Only small amounts of Cr were detected at low LS ratios. With the increase of soaking time, the released amount of Fe, Cu, Mn, Ni, and Zn increased to the maximum value within 48 h, respectively. After adding calcium carbonate, the released amounts of Fe, Cu, and Zn reduced at least 70.80% within 48 h soaking time. The results indicate that summer and the early soaking stage are the main phases for the release of heavy metals from the pyrite tailings. In the pyrite tailings, Cr is difficult to release. Adding calcium carbonate can effectively reduce the release of Fe, Cu, and Zn.
Liangqian Fan; Xi Zhou; Hongbing Luo; Jie Deng; Li Dai; Zhengfu Ju; Zhiming Zhu; Likou Zou; Lin Ji; Bei Li; Lin Cheng. Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments. Sustainability 2016, 8, 96 .
AMA StyleLiangqian Fan, Xi Zhou, Hongbing Luo, Jie Deng, Li Dai, Zhengfu Ju, Zhiming Zhu, Likou Zou, Lin Ji, Bei Li, Lin Cheng. Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments. Sustainability. 2016; 8 (1):96.
Chicago/Turabian StyleLiangqian Fan; Xi Zhou; Hongbing Luo; Jie Deng; Li Dai; Zhengfu Ju; Zhiming Zhu; Likou Zou; Lin Ji; Bei Li; Lin Cheng. 2016. "Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments." Sustainability 8, no. 1: 96.