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The variation of DOM during long distance water transport by the China South to North Water Diversion Scheme and impact on drinking water treatment

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 85-100页

作者： Hankun Yang Yujuan Li Hongyu Liu Nigel J.D.Graham Xue Wu Jiawei Hou Mengjie Liu Wenyu Wang Wenzheng Yu State Key Laboratory of Environmental Aquatic Chemistry Key Laboratory of Drinking Water Science and TechnologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China School of Environment and Municipal Engineering Qingdao Technological UniversityQingdao266033China Colleges of Forestry Northeast Forestry UniversityHarbin150006China Department of Civil and Environmental Engineering Imperial College LondonSouth Kensington CampusLondonSW7 2AZUK School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Separation membrane Processes School of Environment Science and EngineeringTiangong UniversityTianjin300387China

In this study,samples were taken from three locations,upstream to downstream,along the central route project of the China South to North Water Diversion(SNWD)scheme in summer and winter.These were used to reveal the variations of dissolved organic matter(DOM)during the water transfer process,and the effects of these variations on drinking water treatment and disinfection by-products formation potential(DBPs-FP).The results showed that polysaccharides accumulate in summer and reduce in winter with flow distance,which has an important effect on the overall properties of DOM,as well as on the performance of coagulation,ultrafiltration,and the formation of DBPs.Humic substances,and their hydrophilic content,also increased in summer and decreased in winter with flow distance.In contrast,the concentration of small organic substances(MW⩽1000 Da)increased in both summer and winter with flow distance,which affected both nanofiltration(NF)membrane fouling and DBPs-FP.The results provide a useful case study of spatial and temporal changes in raw water DOM during long distance water transfer and their impact on the treatment and quality of drinking water from the SNWD.

关键词： Long-distance water transfer The China South to North Water Diversion Scheme Coagulation membrane filtration Disinfection by-products

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Microfiltration,ultrafiltration and nanofiltration as a post-treatment of biological treatment process with references to oil field produced water of Moran oilfield of Assam

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Petroleum Research 2024年第1期9卷 143-154页

作者： Amarjit Rajbongshi Subrata Borgohain Gogoi Brahmaputra Valley Fertilizer Corporation Limited NamrupAssamIndia Department of Petroleum Technology Dibrugarh UniversityAssamIndia

The selection of an apt technology for the treatment of Oilfield Produced Water(OFPW)depends mainly on the quality of OFPW and methods of pre-and post-treatment processes.The most challenging part of the OFPW treatment process is the removal of Suspended Solid(SS),Oil&Grease(O&G)and dissolved organics.SS and O&G pose an acute problem to the membrane filtration system by fouling the membrane surface which increases operation&maintenance costs and decreases the life of the membrane.Fouling of the membrane surface is mainly attributed to the presence of low molecular weight aromatic compounds and naphthenic acids in the suspended and dissolved organic compounds.Thus,the removal of these suspended and dissolved organic compounds before membrane filtration proffers a challenge to the researchers.In this research,bioremediation process has been applied to remove the organic compounds and the performance and fouling behaviour of hollow fibre Microfiltration(MF),Ultrafiltration(UF)and Nanofiltration(NF)membranes after the bioremediation process has been analyzed in detail.The level of toxicity was determined by comparing the pollutants with the safe discharge limit for disposal into the environment set by Central Pollution Control Board(CPCB),India.The research presents its novelty by using a hydrocarbon-degrading bacteria,Pseudomonas aeruginosa for the Reduction of Organic Loads(ROL)from OFPW of Moran oil field of Upper Assam as a pre-treatment to membrane filtration.The Total Sum Corrected Area(TSCA)method through chromatographic analyses was used for this.The organic loads removal from OFPW by the TSCA method was found to be 67-100%,100%and 100%after 7,14 and 21 days of bioremediation respectively.The major parameters in feed OFPW of Moran oil field were found to be pH(7.5-9.3),Total Dissolved Solid(TDS)(1.79-4.75)ppt,O&G(1.78-2.8)ppt,Salinity(2.94-6.98)ppt,Chloride(Cl^(-))(1.6-3.86)ppt,Bicarbonate(HCO_(3)^(-))(2.89-4.03)ppt.It was observed that the ranges of pollutants removal by NF was highest such as TDS(26-86%),sa

关键词： Oilfield produced water Organic compounds Bioremediation membrane filtration membrane fouling

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The effect of coupling coagulation and flocculation with membrane filtration in water treatment:A review

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Journal of Environmental Sciences 2009年第1期21卷 8-12页

作者： TorOve Leiknes NTNU-Norwegian University of Science and Technology Department of Hydraulic and Environmental EngineeringS. P. Andersensvei 5N-7491 TrondheimNorway

Water supply and sanitation demands are foreseen to face enormous challenges over the coming decades to meet the fast growing needs in a global perspective. Significant growth in the industry is predicted and membrane separation technologies have been identified as one of the possible solutions to meet future demands. Application and implementation of membrane technology is expected both in production of potable water as well as in treatment of wastewater. In potable water production membranes are substituting conventional separation technologies due to the superior performance, potential for less chemical use and sludge production, as well as the potential to fulfill hygienic barrier requirements. membrane bio-reactor （MBR） technology is probably the membrane process which has had most success and has the best prospects for the future in wastewater treatment. Trends and developments indicate that this technology is becoming accepted and is rapidly becoming the best available technology for many wastewater treatment applications. A major drawback of MBR systems is membrane fouling. Studies have shown that fouling mitigation in MBR systems can potentially be done by coupling coagulation and flocculation to the process.

关键词： coagulation and flocculation membrane filtration potable water wastewater

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Transfer and transport of aluminum in filtration unit

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Journal of Environmental Sciences 2007年第8期19卷 897-901页

作者： WANG Wen-dong YANG Hong-wei ZHAO Hua-zhang JIANG Zhan-peng Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China. Department of Environmental Science and Engineering Peking University Beijing 100871 China

Aluminum salt coagulants were used prevalently in various water works. In this article, the effects of filtration on residual aluminum concentration and species distribution were researched by determining the concentration of different aluminum species before and after single layer filter, double layer filter, and membrane filtration units. In the research, size exclusion chromatography （SEC） was used to separate colloidal and soluble aluminum, ion exchange chromatography （IEC） was used to separate organic and inorganic aluminum, and inductivity coupled plasma-atomic emission spectrometry （ICP-AES） was used to determine the aluminum concentration. The results showed that the rapid filtration process had the ability of removing residual aluminum from coagulant effluent water, and that double layer filtration was more effective in residual aluminum removal than single layer filtration, while nano filtration was more effective than micro filtration. It was found that when the residual aluminum concentration was below lmg/L in sediment effluent, the residual aluminum concentration in treated water was above 0.2 mg/L. The direct rapid filtration process mainly removed the suspended aluminum. The removal of soluble and colloidal aluminum was always less than 10% and the natural small particles that adsorbed the amount of soluble or small particles aluminum on their surface were difficult to be removed in this process. Micro filtration and nano filtration were good technologies for removing aluminum; the residual aluminum concentration in the effluent was less than 0.05 mg/L.

关键词： aluminum species membrane filtration rapid filtration

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Pre-oxidation enhanced cyanobacteria removal in drinking water treatment: A review

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Journal of Environmental Sciences 2021年第12期33卷 160-168页

作者： Jing Qi Baiwen Ma Shiyu Miao Ruiping Liu Chengzhi Hu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Cyanobacterial bloom has many adverse effects on source water quality and drinking water production. The traditional water treatment process can hardly achieve satisfactory removal of algae cells. This review examines the impact of pre-oxidation on the removal of cyanobacteria by solid-liquid separation processes. It was reported that the introduction of chemical oxidants such as chlorine, potassium permanganate, and ozone in algae-laden water pretreatment could improve algae removal by the subsequent solid-liquid separation processes. However, over dosed oxidants can result in more serious water quality risks due to significant algae cell lysis and undesirable intracellular organic matter release. It was suggested that moderate pre-oxidation may enhance the removal of cyanobacteria without damaging algae cells. In this article, effects of moderate pretreatment on the solid-liquid separation processes(sedimentation, dissolved air flotation, and membrane filtration) are reviewed.

关键词： Cyanobacterial bloom Pre-oxidation Sedimentation Dissolved air flotation membrane filtration

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Simulation and assessment of sludge concentration and rheology in the process of waste activated sludge treatment

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Journal of Environmental Sciences 2009年第12期21卷 1639-1645页

作者： XIA Mingfang WANG Zhiwei WU Zhichao WANG Xinhua ZHOU Zhen LU Jilai State Key Laboratory of Pollution Control and Resource Reuse Nanjing University Nanjing 210093 China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China

The process of using flat-sheet membrane for simultaneous sludge thickening and digestion （MSTD） was employed. The variations of sludge concentration and rheology were characterized and simulated. Based on mass balance analysis, mathematical models were developed and successfully used to predict and evaluate the variations of sludge concentration and the digestion efficiency in the MSTD process. The apparent viscosity of sludge could be modeled as functions of mixed liquor suspended solids and shear rates. The sludge in the MSTD process showed both shear-thinning and viscoplastic behaviour, and under various shear rates different rheological models could be chosen to predict their flow behaviour. It was also found that sludge concentration and viscosity had significant correlations with membrane fouling in the MSTD process.

关键词： membrane filtration membrane fouling sludge thickening sludge digestion waste activated sludge

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Superhydrophilic membrane with photo-Fenton self-cleaning property for effective microalgae anti-fouling

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中国化学快报:英文版 2023年第8期34卷 444-448页

作者： Yunhua Wang Zhengqi Jiao Wenlong Li Sen Zeng Jiliang Deng Miao Wang Lei Ren Department of Biomaterials College of MaterialsKey Laboratory of Biomedical Engineering of Fujian Province University/Research Center of Biomedical Engineering of XiamenXiamen UniversityXiamen 361005China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

membrane filtration is one of the effective approaches to harvest microalgae for industrial biofuel production.However,during the filtration process,microalgae cells and extracellular organic matter(EOM)will deposit on the membrane surface leading to reversible membrane fouling that can be removed by physical methods.When hydrophobic EOM is adsorbed on the membrane surface or inside pores,it will build up a gel layer,causing irreversible membrane fouling.Irreversible fouling can only be removed using chemical methods that will decrease membrane lifespan and increase operational costs.Here,we introduce a versatile superhydrophilic membrane with photo-Fenton self-cleaning property,which can prevent the reversible fouling and remove the irreversible fouling.Tannic acid(TA)and 3-aminopropyltriethoxysilane(APTES)were co-deposited on the polyvinylidene fluoride(PVDF)membrane via Schiff base and Michael addition reactions,andβ-FeOOH nanorods were inlaid on the membrane surface by in situ mineralization.The water contact angle of the modified membrane is reduced from 120°to 0°Under 60 min visible light,the hydroxyl radical(·OH)generated by the photo-Fenton reaction degraded the irreversible fouling that blocked membrane pores.The irreversible fouling rates of modified membrane was reduced from 39.57%to 3.26%,compared with the original membrane.Microalgae harvesting results illustrated that the membrane has a high flux recovery rate(FRR)of 98.2%,showed excellent passive antifouling and active antifouling performance.We believe this work will spark a novel platform for optimizing energy-efficient microalgae harvesting separation membrane modules.In addition,this method of anti-fouling filtration for microorganisms can be extended to the industrial production of various bioenergy sources and will have very promising practical applications.

关键词： membrane filtration Microalgae harvesting Irreversible membrane fouling Photo-Fenton Superhydrophilic

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A hybrid membrane process for simultaneous thickening and digestion of waste activated sludge

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Frontiers of Environmental Science & Engineering 2010年第3期4卷 272-279页

作者： Zhiwei WANG Qiaoying WANG Zhichao WU Xinhua WANG State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

A hybrid membrane process for simultaneous sludge thickening and digestion(MSTD)was studied.During one cycle(15 d)of operation under a hydraulic retention time of 1 d,the concentration of mixed liquor suspended solids(MLSS)continuously increased from about 4 g·L^(–1)to 34 g·L^(–1),and the mixed liquor volatile suspended solids(MLVSS)increased from about 3 g·L^(–1)to over 22 g·L^(–1).About 42%of the MLVSS and 39%of the MLSS reduction were achieved.The thickening and digestion effects in the MSTD were further analyzed based on a mass balance analysis.Test results showed that biopolymers and cations of biomass were gradually released to the bulk solution during the process.It was also found that the capillary suction time,colloidal chemical oxygen demand,soluble microbial products,viscosity,and MLSS had significant positive correlations with the membrane fouling rate,whereas extracellular polymeric substances,polysaccharides,and proteins extracted from biomass had negative impacts on membrane fouling.

关键词： membrane filtration sludge digestion sludge thickening waste activated sludge

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Upgrading Paper-grade Softwood Kraft Pulp to Dissolving Pulp by Cold Caustic Extraction

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Paper And Biomaterials 2016年第1期1卷 31-37页

作者： Chao Tian QingXian Miao LinQiang Zheng YongHao Ni China National Pulp and Paper Research Institute Beijing 100102 China Limerick Pulp and Paper Centre Department of Chemical Engineering University of New Brunswick Fredericton NB E3B 5A3 Canada Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and Technology Tianjin 300457 China College of Material Engineering Fujian Agriculture and Forestry University Fuzhou Fujian Province 350002 China

Cold caustic extraction has potential applications in the production of dissolving-grade pulps due to its ability to selectively remove hemicellulose from lignocellulosic materials. In this study,we demonstrate the conversion of paper-grade kraft pulp into dissolving pulp by a single-stage cold caustic extraction. Under the extraction conditions of 12 wt% NaOH lye,11% pulp consistency,a temperature of 35℃,and 2 h,a paper-grade softwood kraft pulp was purified to high-grade dissolving pulp with 97. 1% α-cellulose content,1. 2% pentosane content,and narrowed molecular weight distribution. The resulting extraction filtrate was concentrated by nano-filtration to obtain the hemicellulose content of 59. 0 g / L,while the permeate was a clear Na OH solution with 10. 9 wt% concentration. A process configuration was also proposed,integrating this cold caustic extraction process with existing pulp and paper production and multi-purpose utilization of the extraction filtrate.

关键词： cold caustic extraction dissolving pulp α-cellulose membrane filtration hemicellulose

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Electrospun Nanofibrous Mats/membranes for filtration and Separation/Purification Applications

Electrospun Nanofibrous Mats/Membranes for Filtration and Se...

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中国第四届静电纺丝大会(CICE2016)

作者： Xiaojing Ma Zhao Wang Hao Fong Program of Nanoscience and Nanoengineering South Dakota School of Mines and Technology Department of Chemistry and Applied Biological Sciences South Dakota School of Mines and Technology

Low cost and high efficiency methods for water purification have attracted growing research interests.membrane filtration/separation processes provide important approaches for water purification.It is important to note that membrane filtration/separation processes are generally able to operate with substantially less energy consumption than conventional thermal filtration/separation processes.In this talk,electrospun nanofibrous mats/membranes for water purification will be presented in terms of microfiltration,ultrafiltration,nanofiltration,and reverse osmosis;and these mats/membranes exhibit superior performance（i.e.,high rejection fraction,large flux value,low operating pressure,and low degree of fouling）.Additionally,surface-functionalized electrospun nanofibrous mats/membranes as innovative separation media for purification of biological products（e.g.,proteins）will also be presented;such mats/membranes mitigate the concern of high-pressure drop with elevated flow rate and minimize the slow intra-particle diffusion required for traditional resin-bead separation,thus allowing for much faster processing time and significantly reduced liquid waste volume.

关键词： electrospun nanofibers membrane filtration water purification protein separation

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