This page has only limited features, please log in for full access.
In this paper, water quality redundancy/reliability was proposed based on information entropy technology including Tsalli entropy and Shannon entropy in water distribution system (WDS), which was applied to 26 WDS with various layouts. The residual chlorine is considered to be representative of water quality parameter, comply with first-order decay model. The method was performed based on EPANET toolkit and MATLAB environment. The results indicated that approach 1 focused on local nodal water quality is more suitable for evaluating water quality reliability, especially for small WDS. The water quality redundancy increased with the loop number for various layouts, and has an exponential relationship with distance-weighted average nodal degree. The water quality redundancy has a linear relationship with the hydraulic redundancy. In addition, the water quality reliability based on Tsalli entropy and Shannon entropy decreased with the value of decay coefficient, which indicated that the water quality redundancy/reliability can be applied to evaluate and compare the reliability of WDS from view of water quality. The proposed evaluation method based on information entropy can help design, analyze, and improve the scenarios in WDS.
Yumin Wang; Guangcan Zhu. Evaluation of water quality reliability based on entropy in water distribution system. Physica A: Statistical Mechanics and its Applications 2021, 126373 .
AMA StyleYumin Wang, Guangcan Zhu. Evaluation of water quality reliability based on entropy in water distribution system. Physica A: Statistical Mechanics and its Applications. 2021; ():126373.
Chicago/Turabian StyleYumin Wang; Guangcan Zhu. 2021. "Evaluation of water quality reliability based on entropy in water distribution system." Physica A: Statistical Mechanics and its Applications , no. : 126373.
BTEX and chlorinated aliphatic hydrocarbons (CAHs) are the common pollutants found at contaminated sites, and natural attenuation (NA) of CAHs was widely observed where they coexist. In this work, the groundwater in a site co-contaminated with BTEX and CAHs was monitored for one year. The compositions and activities of the microfloras, especially dechlorinators and their relationships with the contaminants, geochemical properties, seasons and depth were evaluated. The results are consistent with the well-known NA conceptual model where CAHs are not able to stimulate the enrichment of dechlorinators alone, but BTEX does promote dechlorination. The higher temperature, rather than ORP in the deeper groundwater of the wet season became a key factor to promote the abundance of dechlorinators, but only when BTEX was available, indicating that the substrates from the BTEX biodegradation played an important role in the dechlorinator enrichment. The elevated ORP in the shallower groundwater exceeded the optimum conditions for reductive dechlorination and no significant seasonal variation of dechlorinators was found. The co-occurrence network revealed the cooperative interactions among the functional microfloras in which dechlorinators, BTEX degraders, and fermentative bacteria jointly promoted the dechlorination. These findings provided us a further understanding of the NA processes in a commingled plume.
Xiaodong Zhang; Moye Luo; Shaopo Deng; Tao Long; Liwei Sun; Ran Yu. Field study of microbial community structure and dechlorination activity in a multi-solvents co-contaminated site undergoing natural attenuation. Journal of Hazardous Materials 2021, 127010 .
AMA StyleXiaodong Zhang, Moye Luo, Shaopo Deng, Tao Long, Liwei Sun, Ran Yu. Field study of microbial community structure and dechlorination activity in a multi-solvents co-contaminated site undergoing natural attenuation. Journal of Hazardous Materials. 2021; ():127010.
Chicago/Turabian StyleXiaodong Zhang; Moye Luo; Shaopo Deng; Tao Long; Liwei Sun; Ran Yu. 2021. "Field study of microbial community structure and dechlorination activity in a multi-solvents co-contaminated site undergoing natural attenuation." Journal of Hazardous Materials , no. : 127010.
Decentralized wastewater treatment technology, especially natural ecological treatment technology has widely been used in rural regions. In this paper, a comprehensive life cycle assessment (LCA) of a typical wastewater ecological treatment technology - artificial wetland technology was conducted. SimaPro software was applied to simulate the wastewater treatment facility, and the CML2 baseline2000 impact evaluation method was selected to analyze the environmental loads and benefits during the life cycle. The environmental impact of the facility adopting grey-black separation mode is compared with that of the unified collection and treatment model to provide scientific basis and suggestions for the selection of wastewater collection and treatment model. The results indicated that the main environmental impact of the Southeast University artificial wetland system comes from the construction and operation of the artificial wetland and aeration tank. Marine water ecotoxicity is the main impact factor, followed by freshwater water ecotoxicity.
Siyi Wang; Zixiang Ji; Yumin Wang. Life Cycle Assessment of Artificial Wetland Systems for Rural Wastewater Treatment. E3S Web of Conferences 2021, 299, 02006 .
AMA StyleSiyi Wang, Zixiang Ji, Yumin Wang. Life Cycle Assessment of Artificial Wetland Systems for Rural Wastewater Treatment. E3S Web of Conferences. 2021; 299 ():02006.
Chicago/Turabian StyleSiyi Wang; Zixiang Ji; Yumin Wang. 2021. "Life Cycle Assessment of Artificial Wetland Systems for Rural Wastewater Treatment." E3S Web of Conferences 299, no. : 02006.
Pesticide adjuvants (PAs) denote the general term for auxiliaries in pesticide preparations except for the active components. Toluene, chloroform, and trichloroethylene are the three most commonly used PAs as organic solvents. The residues of the three chemicals in the process of production and application of pesticides may endanger the ecosystem. In the present study, the mutagenicity of toluene, chloroform, and trichloroethylene as well the mixture of the three chemicals was tested by the Salmonella typhimurium reverse mutation test (Ames test) with TA97, TA98, TA100, and TA102 strains in the system with and without rat liver microsomal preparations (S9). The four tester strains have been used for more than 40 years to detect mutagenic compounds in chemicals, cosmetics, and environmental samples. The mutagenicity was detected on tester strains in the separated experiment from the three chemicals. The addition of S9 decreased the mutation ratios of toluene to four strains, except for the TA100 strain, but increased the mutation ratios of chloroform to four strains except for the TA98 strain. Trichloroethylene caused positive mutagenicity to become negative on the TA102 strain. In the mixed experiment, positive effects were detected only on the TA102 strain in the absence of S9. The addition of S9 increased the mutagenicity except for the TA102 strain. The mixture of toluene, chloroform, and trichloroethylene showed antagonism in mutagenicity to tester strains, except for the TA102 strain without S9. However, the mixture showed a synergistic effect to tester strains after adding S9 except for the TA98 strain.
Jing Zhang; Wenqiang Wang; Zhoutao Pei; Jingya Wu; Ran Yu; Yimin Zhang; Liwei Sun; Yuexiang Gao. Mutagenicity Assessment to Pesticide Adjuvants of Toluene, Chloroform, and Trichloroethylene by Ames Test. International Journal of Environmental Research and Public Health 2021, 18, 8095 .
AMA StyleJing Zhang, Wenqiang Wang, Zhoutao Pei, Jingya Wu, Ran Yu, Yimin Zhang, Liwei Sun, Yuexiang Gao. Mutagenicity Assessment to Pesticide Adjuvants of Toluene, Chloroform, and Trichloroethylene by Ames Test. International Journal of Environmental Research and Public Health. 2021; 18 (15):8095.
Chicago/Turabian StyleJing Zhang; Wenqiang Wang; Zhoutao Pei; Jingya Wu; Ran Yu; Yimin Zhang; Liwei Sun; Yuexiang Gao. 2021. "Mutagenicity Assessment to Pesticide Adjuvants of Toluene, Chloroform, and Trichloroethylene by Ames Test." International Journal of Environmental Research and Public Health 18, no. 15: 8095.
Two Lab-scale ANOXic DEPHosphation (DEPHANOX) bioreactors, in the continuous flow (DEPHANOX-CFR) and sequencing batch reactor (DEPHANOX-SBR) modes, were successfully operated and compared with varying influent C/P ratios. A decrease of influent chemical oxygen demand (COD)/total phosphorus (TP) feeding ratio from 250/4 to 250/14 generally did not significantly affect the nutrient removal performances. However, the overall microbial community structure and composition significantly shifted in the both two DEPHANOX bioreactors. Quantitative polymerase chain reaction results revealed that denitrifying phosphate-accumulating organisms (DPAOs) dominated and accounted for around 78.8 % of phosphorus accumulating organisms (PAOs). High-throughput sequencing results further suggested that the most three prominent phyla identified in the DEPHANOX system under different COD/TP ratio conditions included Proteobacteria (38.8-68.7 %), Bacteroidetes (10.3-12.3 %) and Chloroflexi (12.2-1.9 %). In addition, Dechloromonas and Pseudomonas spp. were identified as the dominant DPAOs. Furthermore, PICRUSt prediction analysis suggested that functional genes related to diverse metabolism pathways, including tricarboxylic acid cycle, electron transport, and nitrogen metabolism, were predicted to be actively involved with simultaneous phosphorus and nitrogen (SPN) removal. This study optimized the influent constituent characteristics and operating conditions of the DEPHANOX system, and provided novel insights into key metabolism functions of DPAOs in the DEPHANOX system.
Peng Chen; Junkang Wu; Xiwu Lu; Ran Yu. Denitrifying phosphorus removal and microbial community characteristics of two-sludge DEPHANOX system: Effects of COD/TP ratio. Biochemical Engineering Journal 2021, 172, 108059 .
AMA StylePeng Chen, Junkang Wu, Xiwu Lu, Ran Yu. Denitrifying phosphorus removal and microbial community characteristics of two-sludge DEPHANOX system: Effects of COD/TP ratio. Biochemical Engineering Journal. 2021; 172 ():108059.
Chicago/Turabian StylePeng Chen; Junkang Wu; Xiwu Lu; Ran Yu. 2021. "Denitrifying phosphorus removal and microbial community characteristics of two-sludge DEPHANOX system: Effects of COD/TP ratio." Biochemical Engineering Journal 172, no. : 108059.
Membrane bioreactor (MBR) technology has been paid extensive attention for wastewater treatment because of its advantages of high effluent quality and minimized occupation space and sludge production. However, the membrane fouling is always an inevitable problem, which causes high operation and maintenance costs and prevents the wide use of MBR technology. The membrane biofouling is the most complicated and has relatively slow progress among all types of fouling. In recent years, many membrane biofouling control methods have been developed. Different from the physical or chemical methods, the biological-based strategies are not only more effective for membrane biofouling control, but also milder and more environment-friendly and, therefore, have been increasingly employed. This paper mainly focuses on the mechanism, unique advantages and development of biological-based control strategies for MBR membrane biofouling such as quorum quenching, uncoupling, flocculants and so on. The paper summarizes the up-to-date development of membrane biofouling control strategies, emphasizes the advantages and promising potential of biological-based ones, and points out the direction for future studies.
Yin Cui; Huan Gao; Ran Yu; Lei Gao; Manjun Zhan. Biological-based control strategies for MBR membrane biofouling: a review. Water Science and Technology 2021, 83, 2597 -2614.
AMA StyleYin Cui, Huan Gao, Ran Yu, Lei Gao, Manjun Zhan. Biological-based control strategies for MBR membrane biofouling: a review. Water Science and Technology. 2021; 83 (11):2597-2614.
Chicago/Turabian StyleYin Cui; Huan Gao; Ran Yu; Lei Gao; Manjun Zhan. 2021. "Biological-based control strategies for MBR membrane biofouling: a review." Water Science and Technology 83, no. 11: 2597-2614.
To sustain water quality in water distribution system (WDS), disinfectant generally chlorine is boosted to water distribution system. However, the concentration of chlorine should be limited to acceptable scope. The upper bound of the scope is set for preventing the occurrence of disinfectant byproduct, which is harmful to human health. The lower bound of the scope is set for controlling the growth of microorganism as well as reducing the cost. As such, the optimization model was applied to solve the water quality issue in WDS. However, in WDS, chlorine decays and varies with time and space, affected by pipe material, temperature, pH value, and chlorine injection. Therefore, in this paper, an inexact \({\mathrm{m}}_{\uplambda }\) fuzzy chance-constrained programming (IMFCCP) model was proposed to optimize the chlorine injection to maintain chlorine in WDS at an acceptable level with consideration of uncertainty in water quality simulation. The results indicated that the upper bounds, the lower bounds, and intervals of the injection mass increased with preference parameter λ, which means that the results are more unreliable with higher preference parameter λ. However, the effect of reliability level ζ on the injection mass is determined by the relationship between the preference parameter λ and reliability level ζ. In case of \(\uplambda \le {\upzeta }_{\mathrm{U}}={\upzeta }_{\mathrm{L}}\), the effect is not more significant than the case of \(\uplambda >{\upzeta }_{\mathrm{U}}={\upzeta }_{\mathrm{L}}\). The results can help managers determine the injection strategy under uncertainty.
Yumin Wang. Inexact $${\mathrm{m}}_{\uplambda }$$ fuzzy chance-constrained programming of booster chlorination for water distribution system under uncertainty. Environmental Monitoring and Assessment 2021, 193, 1 -15.
AMA StyleYumin Wang. Inexact $${\mathrm{m}}_{\uplambda }$$ fuzzy chance-constrained programming of booster chlorination for water distribution system under uncertainty. Environmental Monitoring and Assessment. 2021; 193 (5):1-15.
Chicago/Turabian StyleYumin Wang. 2021. "Inexact $${\mathrm{m}}_{\uplambda }$$ fuzzy chance-constrained programming of booster chlorination for water distribution system under uncertainty." Environmental Monitoring and Assessment 193, no. 5: 1-15.
Water resources carrying capacity (WRCC) is a significant foundation for scientific management of water resources that connected with development of water resources, population, society, and economy. With the rapid development of economy and society, the shortage of water quantity is becoming one of the most profound global issues. In this paper, to evaluate WRCC scientifically and reasonably, index system of WRCC was established and applied for assessing the WRCC of four cities in China by fuzzy matter element (FME) model comprehensively. The indices were weighted by entropy method. The WRCC of four cities of Beijing, Tianjin, Shanghai, and Chongqing are 2.620, 2.503, 2.590, and 2.457, respectively. The results indicated that the WRCC of four cities decreased in the order of Chongqing > Tianjin > Shanghai > Beijing. The method proposed can be applied to other evaluation issues, and the results can help managers realize the importance of water resources in developing the economy and society.
Yumin Wang; Zixiang Ji. Evaluation of Water Resource Carrying Capacity Based on Fuzzy Matter-element Model. IOP Conference Series: Earth and Environmental Science 2021, 706, 012003 .
AMA StyleYumin Wang, Zixiang Ji. Evaluation of Water Resource Carrying Capacity Based on Fuzzy Matter-element Model. IOP Conference Series: Earth and Environmental Science. 2021; 706 (1):012003.
Chicago/Turabian StyleYumin Wang; Zixiang Ji. 2021. "Evaluation of Water Resource Carrying Capacity Based on Fuzzy Matter-element Model." IOP Conference Series: Earth and Environmental Science 706, no. 1: 012003.
Hydrogen evolution reaction (HER) involving electrocatalytic process is established as a promising and non-pollution method for hydrogen production. The cheap alternatives of precious-metal electrocatalysts with high activity and robust stability is essential for the high-scale application of electrocatalytic hydrogen evolution. Recently, carbon-based electrocatalysts derived from biomass have attracted more and more attentions with thanks to their characteristics as low-cost, renewable, abundantly distributed and environmentally friendly. In this work, the original carbon material derived from biomass and the one doped with N and/or S as HER electrocatalysts are intensively overviewed regarding to the electrochemical performance and hydrogen yield. The overpotential at 10 mA cm−2 (η10) is generally greater than 100 mV, which is far inferior to Pt-based catalysts. Consequently, biomass-based carbon materials decorated by transition metal and/or trace amount precious metal were introduced for improving the HER performance. The synergistic effect between metals and heteroatoms can significantly enhance the electrocatalytic activity, and the smallest value of η10 is 10 mV. The limitations and challenges in this area were also addressed as (1) the in-depth investigation of conversion and electrocatalytic mechanism, (2) metal modification via in-situ growth, (3) the reproducibility for biomass transformation, and (4) the catalyst assembly with renewable energy equipment.
Qichang Wang; Rui Guo; Zhanghong Wang; Dekui Shen; Ran Yu; Kaihong Luo; Chunfei Wu; Sai Gu. Progress in carbon-based electrocatalyst derived from biomass for the hydrogen evolution reaction. Fuel 2021, 293, 120440 .
AMA StyleQichang Wang, Rui Guo, Zhanghong Wang, Dekui Shen, Ran Yu, Kaihong Luo, Chunfei Wu, Sai Gu. Progress in carbon-based electrocatalyst derived from biomass for the hydrogen evolution reaction. Fuel. 2021; 293 ():120440.
Chicago/Turabian StyleQichang Wang; Rui Guo; Zhanghong Wang; Dekui Shen; Ran Yu; Kaihong Luo; Chunfei Wu; Sai Gu. 2021. "Progress in carbon-based electrocatalyst derived from biomass for the hydrogen evolution reaction." Fuel 293, no. : 120440.
The nitrogen transformation performances and greenhouse gas nitrous oxide (N2O) emissions in a sequencing batch reactor under chronic exposure to zinc oxide nanoparticles (ZnO NPs) were quantified and the system's self-recovery potentials were assessed. ZnO NPs posed a dose-dependent depression effect on the removal efficiencies of ammonia nitrogen (NH4+-N) and total nitrogen (TN), and the N2O emissions. The suppressed N2O emissions had a positive relationship with the activity ratios of nitrite/NO reductases and N2O reductase, and were expected to be caused by the inhibited heterotrophic denitrification process. The inhibition of glucose metabolism key enzymes and electron transport chain activities would be responsible for the heterotrophic denitrification performances deterioration. Furthermore, the removal efficiencies of NH4+-N and TN were recovered to control levels through the nitrite-shunt. However, the N2O emission increased significantly above the control during the recovery period mainly due to the irreversibility of the depressed nitrite oxidation activities.
Jinyu Ye; Huan Gao; Carlos Domingo-Félez; Junkang Wu; Manjun Zhan; Ran Yu; Barth F. Smets. Insights into chronic zinc oxide nanoparticle stress responses of biological nitrogen removal system with nitrous oxide emission and its recovery potential. Bioresource Technology 2021, 327, 124797 .
AMA StyleJinyu Ye, Huan Gao, Carlos Domingo-Félez, Junkang Wu, Manjun Zhan, Ran Yu, Barth F. Smets. Insights into chronic zinc oxide nanoparticle stress responses of biological nitrogen removal system with nitrous oxide emission and its recovery potential. Bioresource Technology. 2021; 327 ():124797.
Chicago/Turabian StyleJinyu Ye; Huan Gao; Carlos Domingo-Félez; Junkang Wu; Manjun Zhan; Ran Yu; Barth F. Smets. 2021. "Insights into chronic zinc oxide nanoparticle stress responses of biological nitrogen removal system with nitrous oxide emission and its recovery potential." Bioresource Technology 327, no. : 124797.
In the present study, the simplex lattice mixture design method was adopted to design the artificial biomass with different ratios of three major components (cellulose, hemicellulose, lignin). The methane yield from the co-digestion of the artificial/ natural biomass (corn stover, wheat stover, rice straw, and peanut stalk) samples with the mixed sludge at the mixture ratio of 1:1 based on total solid (TS) content was recorded for 50 days. The original mathematical prediction models for estimating the cumulative methane production, maximum methane production rate, and lag phase time were established based on the experimental results from the co-digestion of artificial biomass with sludge. To investigate the influence of the structural features of biomass and interactions among the components of biomass which contributing to the inhibition of methane production, the macroscopic factor (MF) was proposed. The mathematical models which revealed the relationship between MF and the methane production parameters were developed by the combination of the prediction results from the original mathematical prediction model and experimental results from the co-digestion of natural biomass with sludge. Modification of the original mathematical prediction models was carried out by considering MF. After modification, the relative error (RE) and root mean square error (RMSE) of the prediction model for cumulative methane production were declined from 19.00 to 30.18% and 42.38 mL/g VSadded to that of − 1.93~7.14% and 4.36 mL/g VSadded, respectively.
Pengfei Li; Chao He; Chongbo Cheng; Youzhou Jiao; Dekui Shen; Ran Yu. Prediction of methane production from co-digestion of lignocellulosic biomass with sludge based on the major compositions of lignocellulosic biomass. Environmental Science and Pollution Research 2021, 28, 25808 -25818.
AMA StylePengfei Li, Chao He, Chongbo Cheng, Youzhou Jiao, Dekui Shen, Ran Yu. Prediction of methane production from co-digestion of lignocellulosic biomass with sludge based on the major compositions of lignocellulosic biomass. Environmental Science and Pollution Research. 2021; 28 (20):25808-25818.
Chicago/Turabian StylePengfei Li; Chao He; Chongbo Cheng; Youzhou Jiao; Dekui Shen; Ran Yu. 2021. "Prediction of methane production from co-digestion of lignocellulosic biomass with sludge based on the major compositions of lignocellulosic biomass." Environmental Science and Pollution Research 28, no. 20: 25808-25818.
The accelerated urbanization in China has caused intensified micro-pollution problems for drinking water sources, severely challenging drinking water treatment efficiencies and its biostability. This study mainly investigated the effects of ozonation on disinfection by-product formation potentials (DBPFPs) and biological dissolved organic carbon (BDOC) in a pilot-scale ozonation-biological activated carbon advanced drinking water treatment plant with micro-polluted raw water. The results indicated that the micro-polluted water would be effectively treated in the advanced treatment processes with DBPFPs significantly eliminated. The total removal rates of trihalomethane formation potentials (THMFPs) and haloacetic acid formation potentials (HAAFPs) increased with the elevated ozone dosage to finally a relatively stable stage, and the maximum removal rates of 77.3% and 57.0%, respectively, were achieved at the ozone dosage of 2 mg/L. The bromine incorporation in total THMFPs (TTHMFPs) was dramatically suppressed after integrated advanced treatment processes, while that in total HAAFPs (THAAFPs) was promoted with the corresponding increment of up to 25.3% for bromine incorporation factor, which caused relatively high brominated HAAFP proportions in the treated water than in the raw water. In addition, the BDOC generation rate and THAAFP removal rate during the post-ozonation treatment displayed apparent positive correlation, and a similar relationship was observed for the BDOC degradation rate and TTHMFP removal rate during the BAC treatment in the studied ozone dosage (1 ∼ 5 mg/L). The findings strongly implied a promising alternative to measure DBPFP removal rate instead of BDOC level for more sensitive and convenient monitoring of the biostability in the reclaimed water. GRAPHICAL ABSTRACT
Huan Gao; Hongjun Ji; Ran Yu; Guangcan Zhu. Effects of ozonation on disinfection by-product formation potentials and biostability in a pilot-scale drinking water treatment plant with micro-polluted water. Environmental Technology 2020, 1 -12.
AMA StyleHuan Gao, Hongjun Ji, Ran Yu, Guangcan Zhu. Effects of ozonation on disinfection by-product formation potentials and biostability in a pilot-scale drinking water treatment plant with micro-polluted water. Environmental Technology. 2020; ():1-12.
Chicago/Turabian StyleHuan Gao; Hongjun Ji; Ran Yu; Guangcan Zhu. 2020. "Effects of ozonation on disinfection by-product formation potentials and biostability in a pilot-scale drinking water treatment plant with micro-polluted water." Environmental Technology , no. : 1-12.
Wang, Y.; Wu, Y., and Jiang, L., 2020. Application of interval information comprehensive ranking model based on entropy weight in river water quality evaluation. In: Hu, C. and Cai, M. (eds.), Geo-informatics and Oceanography. Journal of Coastal Research, Special Issue No. 105, pp. 137–140. Coconut Creek (Florida), ISSN 0749-0208.In this article, an interval information comprehensive ranking model based on entropy weight is established and applied to river water quality evaluation. In this model, the monitoring interval value of water quality index of river section is weighted with the interval data of standard grade. The weight of each index is calculated by using information entropy technology, and the water quality grade of each section is determined by comprehensive weighted ranking of each section and evaluation grade. The results show that the concept of the model is clear, the calculation is simple, and the evaluation results are objective and reasonable.
Yumin Wang; Yifeng Wu; Lan Jiang. Application of Interval Information Comprehensive Ranking Model Based on Entropy Weight in River Water Quality Evaluation. Journal of Coastal Research 2020, 105, 137 -140.
AMA StyleYumin Wang, Yifeng Wu, Lan Jiang. Application of Interval Information Comprehensive Ranking Model Based on Entropy Weight in River Water Quality Evaluation. Journal of Coastal Research. 2020; 105 (sp1):137-140.
Chicago/Turabian StyleYumin Wang; Yifeng Wu; Lan Jiang. 2020. "Application of Interval Information Comprehensive Ranking Model Based on Entropy Weight in River Water Quality Evaluation." Journal of Coastal Research 105, no. sp1: 137-140.
Despite the behaviors of ZnO nanoparticles (ZnO NPs) in wastewater treatment processes have been widely explored, the impacts of ZnO NPs on the activated sludge's flocculation and sedimentation performances for solid-liquid separation have rarely been involved yet. In this study, ZnO NPs were observed to exert a dose-dependent negative effect on the sludge's flocculation performance but did not significantly impact the sludge’ sedimentation behaviors. Furthermore, it was NPs themselves rather than the dissolved Zn2+ who impaired on the sludge flocculation performance because the Zn2+ alone would not compromise the sludge's flocculation efficiency. In addition, the sludge flocculation performance was revealed to be inversely related to the extracellular polymeric substances (EPS) content in the sludge and the direct contacts between ZnO NPs and the cells in the sludge should be the prerequisite to stimulate the secretion of the sludge EPS. The poor sludge flocculation performance could also be caused by the reduced protein/polysaccharide (PN/PS) ratio and the zeta (ζ) potential in the loosely bound (LB-EPS) after the sludge exposure to ZnO NPs. Fourier transform-infrared spectra (FT-IR) and three dimensional - excitation emission fluorescence spectra (3D-EEM) analysis further revealed that the decrease of the tyrosine PN-like substance level in the LB-EPS was probably the key reason for the decreased PN/PS ratio and ζ potential in the LB-EPS, which eventually induced the decline of the sludge flocculation performance under the ZnO NP stress. These results could potentially expand the knowledge on sludge flocculation and sedimentation in the presence of ZnO NPs.
Jinyu Ye; Huan Gao; Junkang Wu; Ran Yu. Effects of ZnO nanoparticles on flocculation and sedimentation of activated sludge in wastewater treatment process. Environmental Research 2020, 192, 110256 .
AMA StyleJinyu Ye, Huan Gao, Junkang Wu, Ran Yu. Effects of ZnO nanoparticles on flocculation and sedimentation of activated sludge in wastewater treatment process. Environmental Research. 2020; 192 ():110256.
Chicago/Turabian StyleJinyu Ye; Huan Gao; Junkang Wu; Ran Yu. 2020. "Effects of ZnO nanoparticles on flocculation and sedimentation of activated sludge in wastewater treatment process." Environmental Research 192, no. : 110256.
To investigate the possibility of culture medium reuse in large-scale industrial microalgae cultivation for the alleviation of the massive water requirement pressure, the aging forming process of Chlorella vulgaris growing medium was explored and the aged medium’s inhibition mechanisms on cell growth were inspected. The results demonstrated that when the medium was continuously reused, the collected maximal C. vulgaris biomass decreased. After the fourth medium reuse, the maximal biomass concentration was only 55 ± 1.1% of that in the fresh medium, which indicated the gradual aging of the medium. Furthermore, the composition variation of the released organic secretions during the culture medium reuse was monitored and the results showed that high concentrations of fatty acids (FAs), including palmitic acid, stearic acid, and small amounts of polysaccharides, were accumulated. Further investigation indicated that the obtained maximal biomass of C. vulgaris has a negative relationship with the manually added initial FA concentrations in the medium which suggested that the accumulated FAs in the medium probably were the main C. vulgaris growth inhibition factor. The inhibition effect of FAs on C. vulgaris was mainly achieved via impacting the cells’ photosynthesis efficiencies to destroy the intracellular antioxidant system.
Xue He; Yang Yu; Zhongqiang Zhu; Mengting Xue; Panpan Li; Ran Yu. Aging forming process of Chlorella vulgaris growing medium and its cultivation inhibition mechanism. Bioprocess and Biosystems Engineering 2020, 43, 1921 -1929.
AMA StyleXue He, Yang Yu, Zhongqiang Zhu, Mengting Xue, Panpan Li, Ran Yu. Aging forming process of Chlorella vulgaris growing medium and its cultivation inhibition mechanism. Bioprocess and Biosystems Engineering. 2020; 43 (10):1921-1929.
Chicago/Turabian StyleXue He; Yang Yu; Zhongqiang Zhu; Mengting Xue; Panpan Li; Ran Yu. 2020. "Aging forming process of Chlorella vulgaris growing medium and its cultivation inhibition mechanism." Bioprocess and Biosystems Engineering 43, no. 10: 1921-1929.
Microbial fuel cell (MFC) is an innovative bioconversion technology for wastewater treatment accompanied with electricity recovery. In this study, a kinetic model was developed base on Activated Sludge Model No.1 (ASM1) to describe electron transfer pathways during the simultaneous nitrification and denitrification (SND) process in the biocathode system of a dual-chamber MFC. The batch running of the dual-chamber MFC system showed that it produced a power density up to 2.96 W m−3 within 48 h, the achieved SND efficiency and autotrophic denitrification ratio in the cathodic denitrification process were up to 87.3 ± 0.8% and 69.5 ± 6.6%, respectively. Meanwhile, by integrating nitrification, autotrophic denitrification, heterotrophic denitrification, organic carbon oxidation, and oxygen reduction in the cathode, the model was able to precisely fit the concentration variations of NH3–N, dissolved oxygen (DO) and chemical oxygen demand (COD) during the cathodic SND process (R2 ≥ 0.9876). The cathode electrons tended to be completely utilized with the increase of autotrophic denitrification ratio in the cathodic denitrification process. When the nitrification rate was enhanced, the autotrophic denitrification would prevail in the competition with the heterotrophic denitrification. In summary, the developed model was confirmed to be effective and reliable for describing the electron transfer pathways and predicting the performance of the nitrogen removal reactions during the cathodic SND process in a double-chamber MFC.
Feng Ling; Yongze Lu; Ce Wang; Zhan Yuan; Ran Yu; Guangcan Zhu. Electron transfer pathways and kinetic analysis of cathodic simultaneous nitrification and denitrification process in microbial fuel cell system. Environmental Research 2020, 186, 109505 .
AMA StyleFeng Ling, Yongze Lu, Ce Wang, Zhan Yuan, Ran Yu, Guangcan Zhu. Electron transfer pathways and kinetic analysis of cathodic simultaneous nitrification and denitrification process in microbial fuel cell system. Environmental Research. 2020; 186 ():109505.
Chicago/Turabian StyleFeng Ling; Yongze Lu; Ce Wang; Zhan Yuan; Ran Yu; Guangcan Zhu. 2020. "Electron transfer pathways and kinetic analysis of cathodic simultaneous nitrification and denitrification process in microbial fuel cell system." Environmental Research 186, no. : 109505.
Eutrophication has become one of the most serious problems threatening the lakes/reservoirs in China over 50 years. Evaluation of eutrophication is a multi-criteria decision-making process with uncertainties. In this study, a cloud matter element (CME) model was developed in order to evaluate eutrophication level objectively and scientifically, which incorporated the randomness and fuzziness of eutrophication evaluation process. The elements belonging to each eutrophication level in the CME model were determined by means of certainty degrees through repeated simulations of cloud model with reasonable parameters of expectation Ex, entropy En, and hyper-entropy He. The weights of evaluation indicators were decided by a combination of entropy technology and analytic hierarchy process method. The neartudes of water samples to each eutrophication level of lakes/reservoirs in the CME model were generated and the eutrophication levels were determined by maximum neartude principal. The proposed CME model was applied to evaluate eutrophication levels of 24 typical lakes/reservoirs in China. The results of the CME model were compared with those of comprehensive index method, matter element model, fuzzy matter element model, and cloud model. Most of the results obtained by the CME model were consistent with the results obtained by other methods, which proved the CME model is an effective tool to evaluate eutrophication.
Yumin Wang; Xian’E Zhang; Yifeng Wu. Eutrophication Assessment Based on the Cloud Matter Element Model. International Journal of Environmental Research and Public Health 2020, 17, 334 .
AMA StyleYumin Wang, Xian’E Zhang, Yifeng Wu. Eutrophication Assessment Based on the Cloud Matter Element Model. International Journal of Environmental Research and Public Health. 2020; 17 (1):334.
Chicago/Turabian StyleYumin Wang; Xian’E Zhang; Yifeng Wu. 2020. "Eutrophication Assessment Based on the Cloud Matter Element Model." International Journal of Environmental Research and Public Health 17, no. 1: 334.
The bromide concentration in water source (WS) of Yancheng City in China increased unexpectedly due to industrial discharge and saltwater intrusion, which leads to the formation of trihalomethane (THMs) in finished water of water treatment plants (WTP), especially brominated THMs. In Yancheng City, drinking water is supplied by WTP1 and WTP2, primarily sourced by WS1 and WS2, respectively. In this paper, the seasonal variations of bromide in WS1 and WS2 and THMs species in WTP1 and WTP2 were analyzed and compared. The effects of bromide in WS on THMs formation in finished water of WTP in terms of bromine substitution factor (BSF) were simulated by statistical linear model. Although the THMs concentrations in WTP1 were approximate to that in WTP2, the brominated THMs concentrations in WTP1 were higher than that in WTP2 due to higher bromide concentration in WS1 than WS2. The cancer risk analysis indicated that THMs’ species of DBCM is the dominant THMs for WTP1 as well as WTP2, which can provide more information for WTPs with higher bromide concentration in water source.
Yumin Wang; Guangcan Zhu. Risk associated with increasing bromide in drinking water sources in Yancheng City, China. Environmental Monitoring and Assessment 2019, 192, 36 .
AMA StyleYumin Wang, Guangcan Zhu. Risk associated with increasing bromide in drinking water sources in Yancheng City, China. Environmental Monitoring and Assessment. 2019; 192 (1):36.
Chicago/Turabian StyleYumin Wang; Guangcan Zhu. 2019. "Risk associated with increasing bromide in drinking water sources in Yancheng City, China." Environmental Monitoring and Assessment 192, no. 1: 36.
The sediments of water bodies are not only pollutants sink but also sources of pollution. The assessment for the whole-sediment toxicity is still challenging research. Although the application of immobilized algal bead could overcome the practical difficulties in sediment toxicity assay, the weak growth and reduced sensitivity of algae inside the bead restricted its application. In this study, a sediment toxicity test was developed using immobilized sediment and Chlorella vulgaris. The immobilized sediment was prepared by mixing 2 g freeze-dried sediment and 15-mL 3% (w/v) alginate and hardened in a 4% (w/v) CaCl2 solution. Based on a C. vulgaris growth inhibition test and using the immobilized sediment, the median effective concentration value (EC50) of the spiked Cu and diuron was 506.23 and 2.37 mg/kg respectively, lower than that of using immobilized algae (719.62 and 3.12 mg/kg respectively). The Cu and diuron concentrations in the corresponding overlying water from the spiked immobilized and free sediment showed that sediment pollutants' diffusion capacity was not decreased after immobilization. By using the immobilized sediment in algae toxicity bioassay, the changes in the sediment toxicity of a polluted river before and after dredging was evaluated. The C. vulgaris growth inhibition in sediment A decreased from 81.94% to 8.43%; sediment B remained unchanged; sediment C stimulated the growth of C. vulgaris before dredging (−15.56%), but inhibited the algae growth after dredging (26.88%), and sediment D decreased growth inhibition from 32.66% to −12.60%.
Zhou-Tao Pei; Rou-Rou Xu; Han-Yang Liu; Wen-Qiang Wang; Meng Zhang; Li-Ling Zhang; Jing Zhang; Ran Yu; Li-Wei Sun. Development and application of a novel whole sediment toxicity test using immobilized sediment and Chlorella vulgaris. Ecotoxicology and Environmental Safety 2019, 189, 109979 .
AMA StyleZhou-Tao Pei, Rou-Rou Xu, Han-Yang Liu, Wen-Qiang Wang, Meng Zhang, Li-Ling Zhang, Jing Zhang, Ran Yu, Li-Wei Sun. Development and application of a novel whole sediment toxicity test using immobilized sediment and Chlorella vulgaris. Ecotoxicology and Environmental Safety. 2019; 189 ():109979.
Chicago/Turabian StyleZhou-Tao Pei; Rou-Rou Xu; Han-Yang Liu; Wen-Qiang Wang; Meng Zhang; Li-Ling Zhang; Jing Zhang; Ran Yu; Li-Wei Sun. 2019. "Development and application of a novel whole sediment toxicity test using immobilized sediment and Chlorella vulgaris." Ecotoxicology and Environmental Safety 189, no. : 109979.
Although the adverse effects of ZnO nanoparticles (ZnO NPs) on biological nitrogen removal (BNR) processes have widely been reported, the impacts of ZnO NPs on the whole nitrogen transformation processes, especially the production of nitrous oxide (N2O), a typical greenhouse gas in a BNR system have rarely been systematically studied yet. In this study, the performances of both the nitrification and denitrification processes were investigated and the N2O emission was simultaneously monitored in a sequencing batch reactor (SBR) when exposed to 1, 25 or 50 mg/L ZnO NPs for one cycle. The dose-dependent ZnO NP depression effects were generally observed on denitrification processes, total nitrogen (TN) removal efficiency and N2O emissions but not nitrification process. Meanwhile, the N2O emission was positively correlated with NO2−-N accumulation in the oxic stage. Further investigation showed that the expressions of nitrate (NO3−) reduction associated narG gene were down-regulated with the increase of NP stress, and the transcript ratios of NO2−/NO reduction gene to N2O reduction one (nirK/nosZ and norB/nosZ) decreased. The released Zn2+ from ZnO NPs took an important role in the inhibition of denitrification processes. ZnO NPs addition also induced the dose-dependent variations in the superoxide dismutase (SOD) and catalase (CAT) activities, which probably contributed to the suppression of the excess reactive oxygen species (ROS) generations to mitigate nanotoxicity. The excessive secretion of protein (PN) in tightly bound EPS (TB-EPS) when ZnO NPs were no <25 mg/L further supported the system's potential self-regulation mechanism for nanotoxicity resistance. The effects of ZnO NPs on the whole nitrogen transformation processes in a biological nitrogen removal sequencing batch reactor, including the N2O emissions were investigated. The system's potential self-regulation mechanism for nanotoxicity resistance was addressed.
Jinyu Ye; Huan Gao; Junkang Wu; Yan Chang; Zhoukai Chen; Ran Yu. Responses of nitrogen transformation processes and N2O emissions in biological nitrogen removal system to short-term ZnO nanoparticle stress. Science of The Total Environment 2019, 705, 135916 .
AMA StyleJinyu Ye, Huan Gao, Junkang Wu, Yan Chang, Zhoukai Chen, Ran Yu. Responses of nitrogen transformation processes and N2O emissions in biological nitrogen removal system to short-term ZnO nanoparticle stress. Science of The Total Environment. 2019; 705 ():135916.
Chicago/Turabian StyleJinyu Ye; Huan Gao; Junkang Wu; Yan Chang; Zhoukai Chen; Ran Yu. 2019. "Responses of nitrogen transformation processes and N2O emissions in biological nitrogen removal system to short-term ZnO nanoparticle stress." Science of The Total Environment 705, no. : 135916.