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| 1 | A novel integrated step-feed biofilm process for the treatment of decentralized domestic wastewater in rural areas of China显示文摘For wastewater treatment in rural areas, a novel three-stage step-feed wastewater treatment system, combined with a drop-aeration biofilm process, was tested in the laboratory to investigate its performance in removing suspended solids (SS), chemical oxygen demand (COD), NH4+-N, total nitrogen (TN), and total phosphorus (TP). The removal rates of SS, COD and NH4+-N were 90%, 80%, and 90% in efluent concentrations less than 10 mg/L, 50 mg/L and 8 mg/L, respectively. The TP removal rate was less satisfactory. The C/N ratio in the raw wastewater was often less than 3.5, and the removal efficiency of TN was therefore limited. A carbon-release batch experiment was carried out to measure the feasibility of enhancing denitrification at low influent C/N ratios. The result showed that the C/N could be over 9.0 in the supernatant. Polymerase chain reaction denaturing gradient gel electrophoresis technology was used to reveal the changes in the bacterial community during different stages of the integrated step-feed biofilm process. The results showed that banding patterns and the distribution of dominant bands for the same experimental period in different aerobic zones were similar. Phylogenetic analysis indicated that lanes 10, 11 and 12, which presented three aerobic zones at the same operation period, had the closest phylogenetic relationship among the lanes. | Hanwen Liang, Min Gao, Junxin Liu, Yuansong Wei, Xuesong Guo Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. | 2010 | Journal of Environmental Sciences2010，22，3： | 28 |
| 2 | Advanced treatment of municipal wastewater by nanofiltration: Operational optimization and membrane fouling analysis显示文摘Municipal sewage from an oxidation ditch was treated for reuse by nanofiltration(NF) in this study. The NF performance was optimized, and its fouling characteristics after different operational durations(i.e., 48 and 169 hr) were analyzed to investigate the applicability of nanofiltration for water reuse. The optimum performance was achieved when transmembrane pressure = 12 bar, p H = 4 and flow rate = 8 L/min using a GE membrane. The permeate water quality could satisfy the requirements of water reclamation for different uses and local standards for water reuse in Beijing. Flux decline in the fouling experiments could be divided into a rapid flux decline and a quasi-steady state. The boundary flux theory was used to predict the evolution of permeate flux. The expected operational duration based on the 169-hr experiment was 392.6 hr which is 175% longer than that of the 48-hr one. High molecular weight(MW) protein-like substances were suggested to be the dominant foulants after an extended period based on the MW distribution and the fluorescence characteristics. The analyses of infrared spectra and extracellular polymeric substances revealed that the roles of both humic- and polysaccharide-like substances were diminished, while that of protein-like substances were strengthened in the contribution of membrane fouling with time prolonged. Inorganic salts were found to have marginally influence on membrane fouling. Additionally, alkali washing was more efficient at removing organic foulants in the long term, and a combination of water flushing and alkali washing was appropriate for NF fouling control in municipal sewage treatment. | Kun Li Jianxing Wang Jibao Liu Yuansong Wei Meixue Chen | 2016 | Journal of Environmental Sciences2016，28，5： | 14 |
| 3 | Optimization of H_2O_2 dosage in microwave-H_2O_2 process for sludge pretreatment with uniform design method显示文摘A microwave-H2O2 process for sludge pretreatment exhibited high efficiencies of releasing organics,nitrogen,and phosphorus,but large quantities of H2O2 residues were detected.A uniform design method was thus employed in this study to further optimize H2O2 dosage by investigating effects of pH and H2O2 dosage on the amount of H2O2 residue and releases of organics,nitrogen,and phosphorus.A regression model was established with pH and H2O2 dosage as the independent variables,and H2O2 residue and releases of organics,nitrogen,and phosphorus as the dependent variables.In the optimized microwave-H2O2 process,the pH value of the sludge was firstly adjusted to 11.0,then the sludge was heated to 80°C and H2O2 was dosed at a H2O2:mixed liquor suspended solids(MLSS)ratio of 0.2,and the sludge was finally heated to 100°C by microwave irradiation.Compared to the microwave-H2O2 process without optimization,the H2O2 dosage and the utilization rate of H2O2 in the optimized microwave-H2O2 process were reduced by 80% and greatly improved by 3.87 times,respectively,when the H2O2:MLSS dosage ratio was decreased from 1.0 to 0.2,resulting in nearly the same release rate of soluble chemical oxygen demand in the microwave-H2O2 process without optimization at H2O2:MLSS ratio of 0.5. | Qingcong Xiao Hong Yan Yuansong Wei Yawei Wang Fangang Zeng Xiang Zheng | 2012 | Journal of Environmental Sciences2012，24，12： | 12 |
| 4 | Evaluation of phosphorus removal from wastewater by soils in rural areas in China显示文摘Low-cost, easy-maintenance and high-efficiency decentralized wastewater treatment technologies are urgently needed in rural areas of China. Processes with high potential for phosphorus removal are of great interest. However, commonly used treatment methods often do not meet the strict criteria for removing phosphorus from rural wastewater. In order to search an economic and simple technology for phosphorus removal from the common bio-technologies efluent, seven soil types collected from different rural areas in China were investigated for their ability to remove phosphorus. X-ray diffraction (XRD) was used to analyse the mineral structure, and inductively coupled plasma optical emission spectrometer (ICP-OES) was used to analyse the geochemical composition of the soil samples. Three primary minerals-quartz, albite and montmorillonite-were clearly detected. The samples were divided into two soil types, acidic soils and alkaline soils, based on their pH values. The geochemical composition study indicated that a higher percentage of Ca and Mg occurred in alkaline soils (pH>8) than in acidic soils (pH<6.5). Adsorption isotherms from batch experiments fitted the Langmuir and Freundlich models well, the maximum P adsorption capacities ranged from 0.256 to 1.598 mg P/g, indicating a high phosphorus removal potential for all of these soils. The P fractions extracted revealed that the sum of NaOH-extracted inorganic P (NaOH-Pi) was the major P component in the acidic soils, and CaCO3-bound phosphorus (Ca-P) in the alkaline soils. Dynamic adsorption simulation showed that these soils have the ability to remove phosphorus from wastewater. | Hanwen Liang, Junxin Liu, Yuansong Wei, Xuesong GuoResearch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | 2010 | Journal of Environmental Sciences2010，22，1： | 7 |
| 5 | Influence of carbon sources on nutrient removal in A2/O-MBRs: Availability assessment of internal carbon source显示文摘Both internal carbon source and some external carbon sources were used to improve the nutrient removal in Anaerobic-Anoxic-Oxic-Membrane Bioreactor(A^2/O-MBRs), and their technical and cost analysis was investigated. The experimental results showed that the nutrient removals were improved by all the carbon source additions. The total nitrogen and phosphorus removal efficiency were higher in the experiments with external carbon source additions than that with internal carbon source addition. It was found that pathways of nitrogen and phosphorus transform were different dependent on different carbon source additions by the mass balance analysis. With external carbon source addition, the simultaneous nitrification and denitrification occurred in aerobic zone, and the P-uptake in aerobic phase was evident. Therefore, with addition of C-MHP(internal carbon source produced from sludge pretreatment by microwave-H_2O_2 process), the denitrification and phosphorus-uptake in anoxic zone was notable. Cost analysis showed that the unit nitrogen removal costs were 57.13 CNY/kgN of C-acetate addition and 54.48 CNY/kgN of C-MHP addition, respectively. The results indicated that the C-MHP has a good technical and economic feasibility to substitute external carbon sources partially for nutrient removal. | Rongle Xu Yaobo Fan Yuansong Wei Yawei Wang Nan Luo Min Yang Xing Yuan Rong Yu | 2016 | Journal of Environmental Sciences2016，28，10： | 6 |
| 6 | Effects of chlortetracycline,Cu and their combination on the performance and microbial community dynamics in swine manure anaerobic digestion显示文摘Swine manure was typical for the combined pollution of heavy metals and antibiotics. The effects of widely used veterinary antibiotic chlortetracycline(CTC), Cu and their combination on swine manure anaerobic digestion performance and microbial community have never been investigated. Thus, four 2 L anaerobic digestion reactors were established including reactor A(control), B(CTC spiked by 0.5 g/kg dry weight, dw), C(Cu spiked by 5 g/kg dw) and D(combination of CTC, 0.5 g/kg dw, and Cu, 5 g/kg dw), and dynamics of bacterial and archaeal community structure was investigated using high throughput sequencing method. Results showed that addition of CTC and Cu separately could increase the total biogas production by21.6% and 15.8%, respectively, while combination of CTC and Cu severely inhibited anaerobic digestion(by 30.3%). Furthermore, corresponding to different stages and reactors, four kinds of microbes including bacteria and archaea were described in detail, and the effects of CTC, Cu and their combination mainly occurred at hydrolysis and acidification phases. The addition of Cu alone changed the dynamics of archaeal community significantly. It was genus Methanomassiliicoccus that dominated at the active methane production for A, B and D, while it was genus Methanobrevibacter and Methanoculleus for C. | Rui Wang Junya Zhang Jibao Liu Dawei Yu Hui Zhong Yawei Wang Meixue Chen Juan Tong Yuansong Wei | 2018 | Journal of Environmental Sciences2018，30，5： | 5 |
| 7 | Effect of non-solvent additives on the morphology,pore structure, and direct contact membrane distillation performance of PVDF-CTFE hydrophobic membranes显示文摘Four common types of additives for polymer membrane preparation including organic macromolecule and micromolecule additives, inorganic salts and acids, and the strong non-solvent H2 O were used to prepare poly(vinylidene fluoride-co-chlorotrifluoroethylene)(PVDF-CTFE) hydrophobic flat-sheet membranes. Membrane properties including morphology, porosity, hydrophobicity, pore size and pore distribution were investigated, and the permeability was evaluated via direct contact membrane distillation(DCMD) of 3.5 g/L Na Cl solution in a DCMD configuration. Both inorganic and organic micromolecule additives were found to slightly influence membrane hydrophobicity. Polyethylene glycol(PEG),organic acids, Li Cl, Mg Cl2, and Li Cl/H2 O mixtures were proved to be effective additives to PVDF-CTFE membranes due to their pore-controlling effects and the capacity to improve the properties and performance of the resultant membranes. The occurrence of a pre-gelation process showed that when organic and inorganic micromolecules were added to PVDF-CTFE solution, the resultant membranes presented a high interconnectivity structure. The membrane prepared with dibutyl phthalate(DBP) showed a nonporous surface and symmetrical cross-section. When H2 O and Li Cl/H2 O mixtures were also used as additives, they were beneficial for solid–liquid demixing, especially when Li Cl/H2 O mixed additives were used. The membrane prepared with 5% Li Cl + 2% H2 O achieved a flux of24.53 kg/(m2·hr) with 99.98% salt rejection. This study is expected to offer a reference not only for PVDF-CTFE membrane preparation but also for other polymer membranes. | Libing Zheng Zhenjun Wu Yong Zhang Yuansong Wei Jun Wang | 2016 | Journal of Environmental Sciences2016，28，7： | 5 |
| 8 | Effect of organic matter on phosphorus recovery from sewage sludge subjected to microwave hybrid pretreatment显示文摘Microwave(MW) hybrid processes are able to disrupt the flocculent structure of complex waste activated sludge,and help promote the recovery of phosphorus as struvite.In this study,to optimize struvite yield,(1) the characteristics of matter released in MW-hybrid treatments were compared,including MW,MW-acid,MW-alkali,MW-H_2O_2,and MW-H_2O_2- alkali.The results showed that selective release of carbon,nitrogen,phosphorus,Ca^(2+),and Mg^(2+) achieved by sludge pretreatment using MW-hybrid processes.MW-H_2O_2 is the recommended sludge pretreatment process for phosphorus recovery in the form of struvite.The ratio of Mg^(2+):NH_4^+-N:PO_4^(3-)-P was 1.2:2.9:1 in the supernatant.(2) To clarify the effects of organic matter on struvite recovery,the composition and molecular weight distribution of organic matters were analyzed.Low molecular weight COD was found to facilitate the removal rate of NH_4^+-N and PO_4^(3-)P via crystallization,and the amorphous struvite crystals(<1 kDa) from the filtered solutions had high purity.Therefore,the present study reveals the necessity of taking into consideration the interference effect of high molecular weight organic matters during struvite crystallization from sewage sludge. | Yawei Wang Qingcong Xiao Hui Zhong Xiang Zheng Yuansong Wei | 2016 | Journal of Environmental Sciences2016，28，1： | 4 |
| 9 | Optimized pre-treatment of high strength food waste digestate by high content aluminum-nanocluster based magnetic coagulation显示文摘Coagulation-based pre-treatment efficiency of high strength digestate of food waste(HSDFW) anaerobic digestion is negated by organic ligand-catalyzed decomposition of coagulants. In this study, an efficient HSDFW pre-treatment method, magnetic seeds(MS) coagulation, was employed by using highly stable Keggin Al_(30) nanocluster(PAC_(30)), MS and polyacrylamide(PAM), and its operation was optimized by evaluating the performance of removing turbidity, total suspended solids(TSS), chemical oxygen demand(COD), and total phosphorous(TP) phosphate. Results showed that at the optimum dosage of 4.82 g/L, PAC_(30) demonstrated excellent removals as high as 98.93% ± 0.1% of turbidity, 98.04% ± 0.1% of TSS, 58.28% ± 0.3% of total COD, 99.98% ± 0.01% of TP and 99.50% ± 0.01% of dissolved phosphate, respectively. Apparent molecular weight(AMW) and three-dimensional excitation-emission matrix(3 D-EEM) fluorescence spectroscopy analyses demonstrated more efficient removal of dissolved organic matter(DOM), particularly non-biodegradable and hydrophobic components by PAC_(30) than commercial coagulant. The sedimentation was much improved from 40 min by coagulation/flocculation to about 5 min settling by MS coagulation. The PAC_(30) based magnetic coagulation(MC) presents theoretical guidance on a cost-effective and much less footprint pre-treatment alternative for high strength wastewater. | Tharindu Ritigala Hailu Demissie Yanlin Chen Jiaxi Zheng Libing Zheng Jinxing Zhu Hua Fan Jiao Li Dongsheng Wang Sujithra KWeragoda Rohan Weerasooriya Yuansong Wei | 2021 | Journal of Environmental Sciences2021，33，6： | 4 |
| 10 | The behavior of tetracyclines and their degradation products during swine manure composting显示文摘 | Xiaofeng Wu Yuansong Wei Jiaxi Zheng Xin Zhao Weike Zhong | 2011 | Bioresource Technology2011，，10： | 3 |
| 11 | High-performance fiber-integrated multifunctional graphene-optoelectronic device with photoelectric detection and optic-phase modulation显示文摘In graphene-based optoelectronic devices,the ultraweak interaction between a light and monolayer graphene leads to low optical absorption and low responsivity for the photodetectors and relative high half-wave voltage for the phase modulator.Here,an integration of the monolayer graphene onto the side-polished optical fiber is demonstrated,which is capable of providing a cost-effective strategy to enhance the light–graphene interaction,allowing us to obtain a highly efficient optical absorption in graphene and achieve multifunctions:photodetection and optical phase modulation.As a photodetector,the device has ultrahigh responsivity(1.5×10^(7) A/W)and high external quantum efficiency(>1.2×10^(9)%).Additionally,the polybutadiene/polymethyl methacrylate(PMMA)film on the graphene can render the device an optical phase modulator through the large thermo-optic effect of the PMMA.As a phase modulator,the device has a relatively low half-wave voltage of 3 V with a 16 dB extinction ratio in Mach–Zehnder interferometer configuration. | LINQING ZHUO PENGPENG FAN SHUANG ZHANG YUANSONG ZHAN YANMEI LINYU ZHANG DONGQUAN LI ZHEN CHE WENGUO ZHU HUADAN ZHENG JIEYUAN TANG JUN ZHANG YONGCHUN ZHONG WENXIAO FANG GUOGUANG LU JIANHUI YU ZHE CHEN | 2020 | Photonics Research2020，8，12： | 3 |
| 12 | Minimization of excess sludge production for biological wastewater treatment显示文摘 | Yuansong Wei Renze T. Van Houten Arjan R. Borger Dick H. Eikelboom Yaobo Fan | 2003 | Water Research2003，，18： | 2 |
| 13 | Analysis of contact melting around a horizontal elliptical cylinder heat source显示文摘The process of DT-driven contact melting of the solid phase change material (PCM) around a horizontal elliptical cylinder heat source is analyzed. Aiming at the problem existed in the published literature, namely the thickness of boundary layer tends to be infinite at φ= 90°, and considering the difference of normal angle between the horizontal elliptical cylinder surface and the solid-liquid interface of PCM, a new mathematic model is proposed, and the fundamental equations for the melting process are derived with the film theory. The new pressure distribution inside the boundary layer, the variation law of normal angle of the solid-liquid interface, the thickness of the boundary layer and the relationship between the melting velocity and resultant force are obtained. The solutions of the fundamental equations under different elliptical compression coeffcients are analyzed and discussed. It is found that the thickness of the boundary layer obtained by the new model is a finite value and accords with the experimental result at φ = 90°. | Miao Gong Wenzhen Chen Yuansong Zhao Bo Zhu Fengrui Sun | 2008 | Progress in Natural Science:Materials International2008，18，4： | 2 |
| 14 | Sludge Reduction with a Novel Combined Worm-reactor显示文摘 | Yuansong Wei Junxin Liu | 2006 | Hydrobiologia2006，，1： | 1 |
| 15 | Determination and comparison of sludge reduction rates caused by microfaunas’ predation显示文摘 | Peng Liang Xia Huang Yi Qian Yuansong Wei Guoji Ding | 2005 | Bioresource Technology2005，，6： | 1 |
| 16 | Enhanced biohydrogen production from sewage sludge with alkaline pretreatment 显示文摘 | CAI Muiin LIU Junxin WEI Yuansong | 2004 | Environ Sci Technol2004，38，： | 1 |
| 17 | Effect of H 2 O 2 dosing strategy on sludge pretreatment by microwave-H 2 O 2 advanced oxidation process显示文摘 | Yawei Wang Yuansong Wei Junxin Liu | 2009 | Journal of Hazardous Materials2009，，1： | 1 |
| 18 | Minimization of excess sludge production for biological wastewater treatment 显示文摘 | Wei Yuansong van Houten R T Borger A R | 2003 | Water Res2003，37，18： | 1 |
| 19 | Minimization of Excess Sludge Production for Biological Wastewater Treatment显示文摘 | Wei Yuansong Van Houten R T Borger A R | 2003 | Water Research2003，37，18： | 1 |
| 20 | Greenhouse gas emission from the full process of swine manure composting and land application of compost显示文摘 | Zhong Jia Wei Yuansong Wan Hefeng | 2013 | Atmospheric Environment2013，81，： | 1 |
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