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Less pressure contributes to gravity-driven membrane Ultrafiltration with greater performance:Enhanced driving efficiency and reduced disinfection by-products formation potential

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Journal of Environmental Sciences 2024年第3期137卷 407-419页

作者： Xiaoting Wu Yufei Li Zhaoyang Su Long Tian Muhammad Saboor Siddique Wenzheng Yu Colleges of Forestry Northeast Forestry UniversityHarbin 150040China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Gravity-driven membrane(GDM)systems have been well developed previously;however,impacts of driving(i.e.,transmembrane)pressure on their performance received little attention,which may infuence GDM performance.In this study,we evaluated 4 GDM systems via altering the transmembrane pressure from 50 mbar to 150 mbar with 2 groups,treating surface water in Beijing,China.Results showed that less driving pressure was more favorable.Specifically,compared to groups(150 mbar),groups under a pressure of 50 mbar were found to have greater normalized permeability and lower total resistance.During the whole operation period,the quality of effuents was gradually improved.For example,the removal efficiency of UV254was significantly improved;particularly,under low driving pressure,the removal efficiency of UV254in PES GDM system increased by 11.91%,as compared to the corresponding system under high driving pressure.This observation was consistent with the reduction on disinfection by-products(DBPs)formation potential;groups under 50 mbar achieved better DBPs potential control,indicating the advantages of lower driving pressure.Biofilms were analyzed and responsible for these differences,and distinct distributions of bacteria communities of two GDM systems under 50 and 150 mbar may be responsible for various humic-like substances removal efficiency.Overall,GDM systems under less pressure should be considered and expected to provide suggestions on the design of GDM systems in real applications.

关键词： Ultrafiltration Gravity driven operation Membrane fouling Biofilms Disinfection by-products

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Selective adsorption of tetracycline by ß-CD-immobilized sodium alginate aerogel coupled with Ultrafiltration for reclaimed water

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第4期68卷 27-34页

作者： Quan, Xi Zhang, Jun Yin, Linlin Zuo, Wei Tian, Yu Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm SKLU Harbin 150090 Peoples R China

In this work, a novel composite material based on ss-cyclodextrin-immobilized sodium alginate aerogel (ss-CD/NaAlg) was developed utilizing cross-linker of epichlorohydrin and applied as an adsorbent to remove tetracycline antibiotics from reclaimed wastewater. A series of characterizations were utilized to confirm the successful synthesis of the adsorbent and this ss-CD/NaAlg presented a three-dimensional network at the nanoscale or microscale. Under optimal conditions (pH = 4, t = 8 h, ss-CD: NaAlg = 9, adsorbent dosage = 1.5 g$L-1), the maximum removal rate of ss-CD/NaAlg to tetracycline was 70%. The adsorption behavior of tetracycline on ss-CD/NaAlg conformed to the Freundlich isotherm model (R2 = 0.9977) and the pseudo-second-order kinetic model (R2 = 0.9993). Moreover, the adsorbent still removed 55.3% of tetracycline after five cycles. Specially, the adsorbent was integrated with Ultrafiltration to adsorb tetracycline antibiotics from simulated reclaimed wastewater, and the removal rate of tetracycline reached 78.9% within 2 h. The existence of Cr (VI) had a negligible impact on tetracycline removal, while the presence of humic acid exhibited a promoting effect. The possible adsorption mechanisms were also elucidated through X-ray photoelectron spectroscopy and density functional theory analysis. In summary, ss-CD/NaAlg represents an environmentally friendly, efficient, and sustainable adsorbent for removing tetracycline antibiotics from reclaimed water. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

关键词： CD/NaAlg aerogel Covalent grafting Tetracycline antibiotics Ultrafiltration Selective adsorption Reclaimed water REMOVAL

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Charged modified tight ceramic Ultrafiltration membranes for treatment of cationic dye wastewater

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Chinese Journal of Chemical Engineering 2022年第1期35卷 267-277页

作者： Chen Zhao Yahan Ye Xianfu Chen Xiaowei Da Minghui Qiu Yiqun Fan State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211800China Nanjing Membrane Material Industry Technology Institute Co LtdNanjing 211800China

Tight ceramic Ultrafiltration membranes have been proven to exhibit good rejection performance for reactive dye wastewater at high temperatures because of their high thermal and chemical resistance.However,the application of ceramic membranes for the treatment of cationic dye wastewater is challenging because of their surface charge.In this study,a ceramic membrane is modified by grafting aminosilane(KH-551)to enhance the positive charge of the membrane surface.The rejection performance of the charged modified ceramic membrane toward the methylene blue solution is significantly improved.The modification substance is bonded to the ceramic membrane surface via covalent bonding,which imparts good thermal stability.The modified ceramic membrane exhibits stable separation performance toward the methylene blue solution.Overall,this study provides valuable guidance for the adjustment of the ceramic membrane surface charge for treating industrial cationic dye wastewater.

关键词： Membranes Ultrafiltration Separation Modification Surface charge Dye wastewater treatment

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The role of extracellular organic matter on the cyanobacteria Ultrafiltration process

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Journal of Environmental Sciences 2021年第12期33卷 12-20页

作者： Huikai Liang Xin Huang Han Wang Weiying Xu Baoyou Shi Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental ScienceChinese Academy of ScienceBeijing 100085China School of Water Conservancy and Environment University of JinanJinan 250022China University of Chinese Academy of Sciences Beijing 100049China

The membrane fouling caused by extracellular organic matter (EOM) and algal cells and organic matter removal of two typical cyanobacteria (M.aeruginosa and Pseudoanabaena sp.)during Ultrafiltration (UF) process were studied in this work.The results showed that EOM had a broad molecular weight (Mw) distribution and the irreversible membrane fouling was basically caused by EOM.Moreover,humic acid and microbial metabolites were major components of EOM of two typical cyanobacteria.Since EOM could fill the voids of cake layers formed by the algal cells,EOM and algal cells played synergistic roles in membrane fouling.Fourier transform infrared spectroscopy analysis indicated that the CH2and CH3chemical bonds may play an important role in membrane fouling caused by EOM.Interestingly,the cake layer formed by the algal cells could trap the organic matter produced by algae and alleviate some irreversible membrane fouling.The results also showed that although the cake layer formed by the algal cells cause severe permeate flux decline,it could play a double interception role with UF membrane and increase organic matter removal efficiency.Therefore,when using UF to treat algae-laden water,the balance of membrane fouling and organic matter removal should be considered to meet the needs of practical applications.

关键词： Cyanobacteria Extracellular organic matter Ultrafiltration Membrane fouling Water treatment

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Application of heat-activated peroxydisulfate process for the chemical cleaning of fouled Ultrafiltration membranes

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Chinese Chemical Letters 2023年第10期34卷 116-120页

作者： Jiaqi Ding Haoliang Xiao Xiaolong Huang Yujia Zou Zhimin Ye Songlin Wang Pengchao Xie Yongsheng Chen Jun Ma Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration BureauMinistry of Ecological EnvironmentWuhan 430010China School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Water&Wastewater Treatment(HUST) MOHURDWuhan 430074China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332United States State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China

Na Cl O has been widely used to restore membrane flux in practical membrane cleaning processes,which would induce the formation of toxic halogenated byproducts.In this study,we proposed a novel heatactivated peroxydisulfate(heat/PDS)process to clean the membrane fouling derived from humic acid(HA).The results show that the combination of heat and PDS can achieve almost 100%recovery of permeate flux after soaking the HA-fouled membrane in 1 mmol/L PDS solution at 50℃ for 2 h,which is attributed to the changes of HA structure and enhanced detachment of foulants from membranes.The properties of different treated membranes are characterized by scanning electron microscopy(SEM),atomic force microscope(AFM),attenuated total reflection Fourier transform infrared spectroscopy(ATRFTIR),and X-ray photoelectron spectroscopy(XPS),demonstrating that the reversible and irreversible foulants could be effectively removed by heat/PDS cleaning.The filtration process and fouling mechanism of the cleaned membrane were close to that of the virgin membrane,illustrating the good reusability of the cleaned membrane.Additionally,heat/PDS which can avoid the generation of halogenated byproducts shows comparable performance to Na Cl O on membrane cleaning and high performance for the removal of fouling caused by sodium alginate(SA),HA-bovine serum albumin(BSA)-SA mixture and algae,further suggesting that heat/PDS would be a potential alternative for membrane cleaning in practical application.

关键词： Chemical cleaning Peroxydisulfate Heat Membrane fouling Ultrafiltration

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Influence of floc dynamic protection layer on alleviating Ultrafiltration membrane fouling induced by humic substances

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Journal of Environmental Sciences 2020年第4期32卷 10-19页

作者： Baiwen Ma Siqi Wu Bodong Wang Zenglu Qi Yaohui Bai Huijuan Liu Jiuhui Qu Ruijun Wu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China University of Chinese Academy of Sciences Beijing100049China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi'an710055China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing100084China Research Center for Water Quality and Ecology Tsinghua UniversityBeijing100084China State Key Laboratory of Membrane Materials and Membrane Applications Tianjin Motimo Membrane Technology Co.Ltd.Tianjin300457China

Cake layer formation is inevitable over time for Ultrafiltration(UF)membrane-based drinking water treatment.Although the cake layer is always considered to cause membrane fouling,it can also act as a"dynamic protection layer",as it further adsorbs pollutants and dramatically reduces their chance of getting to the membrane surface.Here,the UF membrane fouling performance was investigated with pre-deposited loose flocs in the presence of humic acid(HA).The results showed that the floc dynamic protection layer played an important role in removing HA.The higher the solution pH,the more negative the floc charge,resulting in lower HA removal efficiency due to the electrostatic repulsion and large pore size of the floc layer.With decreasing solution pH,a positively charged floc dynamic protection layer was formed,and more HA molecules were adsorbed.The potential reasons were ascribed to the smaller floc size,greater positive charge,and higher roughness of the floc layer.However,similar membrane fouling performance was also observed for the negative and positive floc dynamic protection layers due to their strong looseness characteristics.In addition,the molecular weight(MW)distribution of HA also played an important role in UF membrane fouling behavior.For the small MW HA molecules,the chance of forming a loose cake layer was high with a negatively charged floc dynamic protection layer,while for the large MW HA molecules it was high with a positively charged floc dynamic protection layer.As a result,slight UF membrane fouling was induced.

关键词： Ultrafiltration Floc dynamic protection layer Humic substances Fouling alleviation

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Characterization of dissolved organic matter and membrane fouling in coagulation-Ultrafiltration process treating micro-polluted surface water

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Journal of Environmental Sciences 2019年第1期31卷 318-324页

作者： Fan Bu Baoyu Gao Qinyan Yue Xue Shen Wenyu Wang Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University

Coagulation–Ultrafiltration(C–UF) is widely used for surface water treatment. With the removal of pollutants, the characteristics of organic matter change and affect the final treatment efficiency and the development of membrane fouling. In this study, we built a dynamic C–UF set-up to carry out the treatment of micro-polluted surface water, to investigate the characteristics of dissolved organic matter from different units. The influences of poly aluminum chloride and poly dimethyldiallylammonium chloride(PDMDAAC) on removal efficiency and membrane fouling were also investigated. Results showed that the dosage of PDMDAAC evidently increased the UV254 and dissolved organic carbon removal efficiencies,and thereby alleviated membrane fouling in the C–UF process. Most hydrophobic bases(HoB)and hydrophobic neutral fractions could be removed by coagulation. Similarly, UF was good at removing HoB compared to hydrophilic substances(HiS) and hydrophobic acid(HoA)fractions. HiS and HoA fractions with low molecule weight accumulated on the surface of the membrane, causing the increase of transmembrane pressure(TMP). Membrane fouling was mainly caused by a removable cake layer, and mechanical cleaning was an efficient way to decrease the TMP.

关键词： Coagulation Ultrafiltration Dissolved organic matter Membrane fouling

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Metabonomics:A Useful Tool to Reveal Underlying Relationships between Altered Chinese Medicine Syndromes and Ultrafiltration in Treatment of Heart Failure

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Chinese Journal of Integrative Medicine 2021年第4期27卷 259-264页

作者： GUO Li-jun CHEN Ke-ji SUN Ming-qian WANG An-zhu GAO Feng ZHENG Yuan MA Xiao-chang Graduate School of Beijing University of Chinese Medicine Beijing(100029)China Cardiovascular Disease Center Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing(100091)China Institute of Basic Medicine Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing(100091)China

Objective:To reveal the underlying relationships between Chinese medicine(CM)syndromes and Ultrafiltration(UF)in the treatment of heart failure based on a metabonomic approach.Methods:Seventeen acute decompensated heart failure(ADHF)patients were enrolled,and their CM syndromes before and after UF were collected.In addition,their venous plasma collected before and after UF was used for liquid chromatographmass spectrometer-based metabonomic analysis.Both reversed phase liquid chromatography and hydrophilic interaction liquid chromatography were used to analyze the plasma samples.Partial least-squares to latent structure-discriminant analyses were used for data analysis.Results:An obvious difference was observed preand post-treatment.A total of 17 potential biomarkers associating with alterd syndromes with UF including hypoxanthine,1-methylhistidine,phytosphingosine,O-decanoyl-R-carnitine,etc.were screened out,showing a significant change after UF.The major adjusted m etabolic pathways were purine metabolism,histidine metabolism,leucine and isoleucine metabolism,arginine and proline metabolism,carnitine shuttle,sphingolipid metabolism and phospholipid metabolism.Conclusions:Metabonomic approach is a useful tool to identify potential biomarkers of altered syndromes link to UF and could provide a theoretical basis for further research on the therapeutic mechanism of UF combined with CM.

关键词： metabonomics heart failure Ultrafiltration Chinese medicine

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Effects of protein properties on Ultrafiltration membrane fouling performance in water treatment

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Journal of Environmental Sciences 2019年第3期31卷 273-281页

作者： Yanyan Ding Baiwen Ma Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Protein-like substances always induce severe Ultrafiltration(UF) membrane fouling. To systematically understand the effect of proteins, regenerated cellulose UF membrane(commonly used for protein separation) performance was investigated in the presence of bovine serum albumin(BSA) under various water conditions. Results showed that although trypsin enhanced the membrane flux via proteolysis, catalysis took a long time. Membrane fouling was alleviated at high solution p H and low water temperature owing to the strong electrostatic repulsion force among BSA molecules. Both Na^+ and Ca^(2+)could increase membrane flux. However, Ca^(2+)played a bridging role between adjacent BSA molecules,whereas membrane fouling was alleviated via a hydration repulsion force with Na+. The order of influence on membrane fouling was as follows: Ca^(2+)concentration > Na+concentration > pH > temperature > trypsin concentration. Furthermore, a polyvinylidene fluoride UF membrane experiment showed that Ca^(2+)could reduce the fouling induced by BSA. Thus, the differences in UF membrane performance will have application potential for alleviating UF membrane fouling induced by proteins during water treatment.

关键词： Ultrafiltration membrane Protein properties Influencing factors Membrane performance

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Effects of effluent organic matters on endocrine disrupting chemical removal by Ultrafiltration and ozonation in synthetic secondary effluent

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Journal of Environmental Sciences 2019年第2期31卷 57-64页

作者： Xiurong Si Zunfang Hu Ding Ding Xu Fu Civil Engineering Department North China Institute of Aerospace Engineering Shandong Institute of Geophysical and Geochemical Exploration

Endocrine disrupting chemicals(EDCs) in the secondary effluent discharged from wastewater treatment plants are of great concern when water reuse is intended. Ozonation and Ultrafiltration(UF) are powerful technologies reported to eliminate EDCs. Due to the importance of effluent organic matters(EfOMs) in secondary effluent, the effects of three kinds of EfOM on the treatment of five EDCs using ozonation and UF were investigated. The three kinds of EfOM studied were humic acid sodium salt(NaAH), bovine serum albumin(BSA)and sodium alginate(NaAg); and the five EDCs were estrone, 17β-estradiol, estriol, 17α-ethynyl estradiol and bisphenol A. The results showed that EfOM accelerated the decay rate of ozone and inhibited the degradation efficiency of EDCs by ozonation in the order NaAH > BSA > NaAg.The ultraviolet absorbance at 280 nm(UVA_(280)) has potential for use as a surrogate indicator to assess EDC removal via ozonation without conducting difficult EDC analyses. When the decline in UVA_(280) exceeded 18%, the five EDCs had been completely removed. The UF behavior of NaAH,BSA and NaAg was found to follow the cake filtration law. The fouling potential of EfOM followed the order NaAg > NaAH > BSA; while EfOM on the membrane surface enhanced EDC removal in the order NaAH > BSA > NaAg. The mean retention rate of the membrane was increased by 24%, 10% and 8%, respectively. The properties of EDCs and EfOM cakes both influenced the EDC removal rates due to adsorption, size exclusion and charge attraction.

关键词： Endocrine disrupting chemicals Ultrafiltration Ozonation Effluent organic matters Secondary effluent

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