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forward osmosis coupled with lime-soda ash softening for volume minimization of reverse osmosis concentrate and CaCO_(3) recovery: A case study on the coal chemical industry

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Frontiers of Environmental Science & Engineering 2021年第1期15卷 135-144页

作者： Jiandong Lu Shijie You Xiuheng Wang State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Reverse osmosis(RO)is frequently used for water reclamation from treated wastewater or desalination *** RO concentrate(ROC)produced from the coal chemical industry(CCI)generally contains refractory organic pollutants and extremely high-concentration inorganic salts with a dissolved solids content of more than 20 g/L contributed by inorganic ions,such as Na^(+),Ca^(2+),Mg^(2+),Cl^(−),and SO_(4)^(2−).To address this issue,in this study,we focused on coupling forward osmosis(FO)with chemical softening(FO-CS)for the volume minimization of CCI ROC and the recovery of valuable resources in the form of CaCO_(3).In the case of the real raw CCI ROC,softening treatment by lime-soda ash was shown to effectively remove Ca^(2+)/Ba^(2+)(>98.5%)and Mg^(2+)/Sr^(2+)/Si(>80%),as well as significantly mitigate membrane scaling during *** softened ROC and raw ROC corresponded to a maximum water recovery of 86%and 54%,*** cyclic FO tests(4×10 h),a 27%decline in the water flux was observed for raw ROC,whereas only 4%was observed for softened *** cleaning efficiency using EDTA was also found to be considerably higher for softened ROC(88.5%)than that for raw ROC(49.0%).In addition,CaCO3(92.2%purity)was recovered from the softening sludge with an average yield of 5.6 kg/m^(3) treated *** study provides a proof-of-concept demonstration of the FO-CS coupling process for ROC volume minimization and valuable resources recovery,which makes the treatment of CCI ROC more efficient and more economical.

关键词： Coal chemical industry forward osmosis Chemical softening Reverse osmosis concentrate

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Thin-film composite forward osmosis membranes with substrate layer composed of polysulfone blended with PEG or polysulfone grafted PEG methyl ether methacrylate

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Frontiers of Chemical Science and Engineering 2016年第4期10卷 562-574页

作者： Baicang Liu Chen Chen Pingju Zhao Tong Li Caihong Liu Qingyuan Wang Yongsheng Chen John Crittenden College of Architecture and Environment Sichuan University Chengdu 610065 China Institute of New Energy and Low Carbon Technology Siehnan University Chengdu 610207 China Litree Purifying Technology Co. Ltd Haikou 571126 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin 150090 China School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA 30332 USA

To advance commercial application of forward osmosis （FO）, we investigated the effects of two additives on the performance of polysulfone （PSf） based FO membranes： one is poly（ethylene glycol）（PEG）, and another is PSf grafted with PEG methyl ether methacrylate （PSf-g-PEGMA）. PSf blended with PEG or PSf-g- PEGMA was used to form a substrate layer, and then polyamide was formed on a support layer by interfacial polymerization. In this study, NaC1 （1 mol·L^-1） and deionized water were used as the draw solution and the feed solution, respectively. With the increase of PEG content from 0 to 15 wt-%, FO water flux declined by 23.4% to 59.3% compared to a PSf TFC FO membrane. With the increase of PSf-g-PEGMA from 0 to 15 wt-%, the membrane flux showed almost no change at first and then declined by about 52.0% and 50.4%. The PSfwith 5 wt-% PSf-g-PEGMA FO membrane showed a higher pure water flux of 8.74 L·m^-2·h^-1 than the commercial HTI membranes （6-8 L·m^-2·h^-1） under the FO mode. Our study suggests that hydrophobic interface is very important for the formation ofpolyamide, and a small amount of PSf- g-PEGMA can maintain a good condition for the formation of polyamide and reduce internal concentration polarization.

关键词： thin-film composite forward osmosis amphi-philic copolymer interfacial polymerization poly(ethyleneglycol)

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A review on the forward osmosis applications and fouling control strategies for wastewater treatment

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 661-680页

作者： Linwei Zhu Chun Ding Tengyang Zhu Yan Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074China Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

During the last decades,the utilization of osmotic pressure-driven forward osmosis technology for wastewater treatment has drawn great interest,due to its high separation efficiency,low membrane fouling propensity,high water recovery and relatively low energy *** review paper summarizes the implementation of forward osmosis technology for various wastewater treatment including municipal sewage,landfill leachate,oil/gas exploitation wastewater,textile wastewater,mine wastewater,and radioactive ***,membrane fouling is still a critical issue,which affects water flux stability,membrane life and operating *** membrane fouling types and corresponding fouling mechanisms,including organic fouling,inorganic fouling,biofouling and combined fouling are therefore further *** fouling control strategies including feed pre-treatment,operation condition optimization,membrane selection and modification,membrane cleaning and tailoring the chemistry of draw solution are also reviewed *** the end of paper,some recommendations are proposed.

关键词： forward osmosis wastewater treatment membrane fouling fouling control

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Ultralong hydroxyapatite-based forward osmosis membrane for freshwater generation

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 37-49页

作者： Mohamed Gamal Gomaa Hamdy Maamoun Abdel-Ghafar Francesco Galiano Francesca Russo Alberto Figoli El-Sayed Ali Abdel-Aal Abdel-Hakim Taha Kandil Bahaa Ahmed Salah Central Metallurgical Research and Development Institute(CMRDI) 11421 CairoEgypt Chemistry Department Faculty of ScienceHelwan University11795 CairoEgypt Institute on Membrane Technology(CNR-ITM) 87036 RendeItaly

Increasing global water shortages are accelerating the pace of membrane manufacturing,which generates many environmentally harmful *** challenges need a radical rethink of developing innovative membranes that can address freshwater production without generating environmentally harmful *** work utilized the synthesized ultra-long hydroxyapatite(UHA)by the solvothermal method using the green solvent oleic acid in preparing UHA-based forward osmosis *** membranes were developed using different loading ratios of graphene oxide(GO)by vacuum-assisted filtration *** prepared GO/UHA membranes were identified using X-ray diffraction,scanning electron microscope,Fourier-transform infrared spectroscopy,and X-ray photoelectron *** contact angle and pore size distribution were determined for the obtained GO/UHA *** obtained hierarchical porous structure in the prepared membranes with interconnected channels results in a stable water flux with reverse salt *** best water flux rate of 42±2 L·m^(–2)·h^(–1)was achieved using the 50 mg GO/UHA membrane,which is 3.3 times higher than the pristine membrane,and a reverse salt flux of 67 g·m^(-2)·h^(–1).The obtained results showed a promising capability of a new generation of sustainable inorganic-based membranes that can be utilized in freshwater generation by energy-efficient techniques such as forward osmosis.

关键词： forward osmosis ultra-long hydroxyapatite graphene oxide inorganic-based membrane

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Polydopamine/Imogolite Nanotubes(PDA/INTs)Interlayer Modulated Thin Film Composite forward osmosis Membrane for Minimizing Internal Concentration Polarization

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Chinese Journal of Polymer Science 2022年第10期40卷 1233-1241,I0010页

作者： Jian-Chen Han Shao-Fei Wang Ran Deng Qing-Yun Wu School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo 31521China

forward osmosis(FO)as an energy-saving membrane process has attracted much attention in food concentration,water treatment,and *** film composite(TFC)membrane is the most popular FO membrane,but it suffers from the internal concentration polarization(ICP),which significantly limits the water flux and FO *** this report,we demonstrate a novel and high-performing thin film nanocomposite(TFN)membrane that employs a hydrophilic interlayer composed of imogolite nanotubes(INTs)and polydopamine(PDA).The INTs can be adhered to the porous substrate by the self-polymerization of PDA,and the as-prepared PDA/INTs interlayer displays a nanostructured network with outstanding *** detailed investigation was conducted to understand the relationship between the structure and property of the PDA/INTs interlayer and the morphology and performance of the TFN *** TFN membrane with the PDA/INTs interlayer performs a thinner and smoother polyamide selective ***,the TFN membrane shows a water flux of 18.38 L·m^(-2)·h^(-1),which is 2.18 times of the pristine TFC ***,the TFN membrane has a minimized structural parameter(577μm),almost a half of that of the pristine one(949μm).It reveals that the ICP effect of TFC membrane can be effectively alleviated by using a hydrophilic PDA/INTs *** TFN membrane with a satisfactory water permeability is promising in terms of future applications.

关键词： Interlayer forward osmosis Internal concentration polarization Nanotube Thin film composite membrane

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Osmotic concentration of succinic acid by forward osmosis:Influence of feed solution pH and evaluation of seawater as draw solution

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Chinese Journal of Chemical Engineering 2018年第5期26卷 976-983页

作者： Jeng Yih Law Abdul Wahab Mohammad Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Section of Chemical Engineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical & Bioengineering Technology

In this study, we investigated the essential role of feed solution pH so as to gain insights into the transport mechanisms of succinic acid concentration by osmotically-driven forward osmosis （FO） process. FO performances including water flux and bidirectional transport of succinate and chloride anions were systematically examined using cellulose triacetate-based FO membrane. Additionally, real seawater was explored as draw solution. Experimental results revealed that the pH-dependent speciation of succinic acid can affect the FO performances. Ionization of succinic acid at higher solution pH enhanced the osmotic pressure of feed solution, thus leading to lower water flux performance. A strong effect was pointed out on the succinate rejection for which nearly 100% rejections were achieved at pH above its pKa2 value. The rejection of succinate increased in the following order of chemical form： C2H4C2O4H2 〈 C2H4C2OH- 〈 C2H4C2O24-. With real seawater as the draw solution, low to moderate water fluxes （〈4 L. m- 2. h- 1 ） were observed. The divalent succinate anion was highly retained in the feed side despite differences in the succinic acid feed concentration at pH of approximately 6.90.

关键词： forward osmosis Succinic acid pH Transport mechanism Seawater

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Preparation of novel magnetic nanoparticles as draw solutes in forward osmosis desalination

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Chinese Journal of Chemical Engineering 2022年第6期35卷 223-230页

作者： Dongze Ma Ye Tian Tiefei He Xiaobiao Zhu Department of Environmental Science and Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Novel magnetic nanoparticles(MNPs),Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2),were prepared by loading different amounts of SiO_(2) or/and PEG-(COOH)_(2) onto Fe_(3)O_(4) nanoparticles,and their feasibility to be used as forward osmosis(FO)draw solutes was *** characterization of the materials showed that,compared to normal Fe_(3)O_(4) nanoparticles,the modified MNPs exhibited enhanced dispersity and high osmotic pressure in aqueous *** FO experiment indicated that the synthesized draw solutes could obtain a water flux as high as 10 L·m^(-2)·h^(-1) with an aquaporin FO *** optimal concentration of the added tetraethyl orthosilicate was 30%during the *** novel MNPs could be easily recovered from draw solutions by magnetic field,and the recovery rate of Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) was 83.95%and 63.37%,***,after 5 recycles of reuse,the water flux of Fe_(3)O_(4)@SiO_(2) and Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) as draw solutes still remained 64.36%and 85.26%,*** experimental results demonstrated that the synthesized core–shell magnetic nanoparticles are promising draw solutes,and the Fe_(3)O_(4)@SiO_(2)@PEG-(COOH)_(2) was more suitable to be used as draw solute in FO process.

关键词： Magnetic nanoparticles forward osmosis Draw solute Fe_(3)O_(4) PEG-(COOH)_(2)

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Photocatalytic thin film composite forward osmosis membrane for mitigating organic fouling in active layer facing draw solution mode

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Chinese Chemical Letters 2023年第6期34卷 230-235页

作者： Yang Hu Pin Zhao Hao Liu Xiawen Yi Weilong Song Xinhua Wang Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

As a high-flux operation mode of thin film composite-forward osmosis(TFC-FO)membrane,active layer facing draw solution(AL-DS)mode suffers from the severe membrane fouling tendency,which is not addressed ***,we introduced a photocatalyst(Anatase titanium dioxide,A-TiO_(2))onto the support layer of TFC-FO membrane via the bonding of polydopamine(PDA)and polytetrafluoroethylene(PTFE),and prepared two photocatalytic membranes,A-TiO_(2)/PDA@TFC and A-TiO_(2)/PTFE@*** with the pristine TFC-FO membrane,both A-Ti O_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC had an improved water permeability(10.5 L m^(-2)h^(-1)and 9.5 L m^(-2)h^(-1),respectively)and reduced reverse Na Cl flux salt(0.8 g m^(-2)h^(-1)and 0.7 g m^(-2)h^(-1),respectively)in the AL-DS mode using 1 mol/L Na Cl as draw solution and pure water as feed ***,in the 16 h fouling experiment using 200 ppm bovine serum albumin(BSA)solution as a representative pollutant,the flux decline rate of both photocatalytic membranes was dramatically alleviated from 39.7%and 21.7%in the darkness to 8.5%and 9.7%under UV irradiation,respectively,indicating a significant anti-fouling capacity of photocatalytic *** all,the presence of A-TiO_(2)endowed membrane with high permeability,high rejection efficiency and excellent anti-fouling capacity under UV *** bonding agent,PTFE provided the modified membrane with a high photocatalytic effect and high self-cleaning capacity,while PDA increased the membrane permeability and protected membrane against photocatalytic *** work provides a simple and feasible method to improve the anti-fouling capacity of TFC-FO membrane in AL-DS mode.

关键词： forward osmosis Photocatalysis Membrane orientation Membrane fouling Water permeation

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Lithium-based draw solute for forward osmosis to treat wastewater discharged from lithium-ion battery manufacturing

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 755-763页

作者： Rongzhen Chen Xinfei Dong Qingchun Ge College of Environment and Safety Engineering Fuzhou UniversityFuzhou 350116China

As draw solute is the core element of forward osmosis(FO)technology,here Li-Bet-Tf_(2)N synthesized from a customized ionic liquid betainium bis(trifluoromethylsulfonyl)imide([Hbet][Tf_(2)N])and Li2CO_(3) recovered from lithium-ion battery(LIB)wastes is proposed as a novel draw solute to treat Li+-containing wastewater from LIB manufacturing through FO *** high dissociation ability and an extended structure,Li-Bet-Tf_(2)N generates a sufficiently high osmotic pressure to drive the FO filtration efficiently along with insignificant reverse solute ***-Bet-Tf_(2)N produces a water flux of 21.3 L·(m^(2)·h)–1 at 1.0 mol∙L^(-1) against deionized water,surpassing conventional NaCl and MgCl2 draw solutes with a higher water recovery efficiency and a smaller solute ***-Bet-Tf_(2)N induces a more stable and higher water permeation flux with a 10.0%water flux decline than NaCl and MgCl_(2) for which the water fluxes decline 16.7%and 16.4%,respectively,during the treatment of 2000 mg∙L^(-1) Li+-containing wastewater for 12 *** remarkably,unlike other draw solutes which require intensive energy input and complicated processes in recycling,Li-Bet-Tf_(2)N is easily separated from water via solvent *** results are achieved with the recycled Li-Bet-Tf_(2)***-Bet-Tf_(2)N thus demonstrates a novel class of draw solute with great potentials to treat wastewater economically.

关键词： forward osmosis lithium-ion battery draw solution lithium-containing wastewater water treatment

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Design of nanofibre interlayer supported forward osmosis composite membranes and its evaluation in fouling study with cleaning

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Frontiers of Environmental Science & Engineering 2022年第9期16卷 77-88页

作者： Tao Ma Haiqing Hui Xiaofei You Zhiqiang Pei Miao Tian Bing Wu School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710072China Singapore Membrane Technology Centre Nanyang Environment and Water Research InstituteNanyang Technological UniversitySingapore 637141Singapore Beijing Origin Water Membrane Technology Co. Ltd.Beijing 101407China Faculty of Civil and Environmental Engineering University of IcelandReykjavik IS-107Iceland

Nanofibre-supported forward osmosis(FO)membranes have gained popularity owing to their low structural parameters and high water ***,the nanofibrous membranes are less stable in long-term use,and their fouling behaviours with foulants in both feed solution(FS)and draw solution(DS)is less *** study developed a nanofibrous thin-film composite(TFC)FO membrane by designing a tiered dual-layer nanofibrous substrate to enhance membrane stability during long-term usage and *** characterisation methods were used to study the effect of the electrospun nanofibre interlayer and drying time,which is the interval after removing the M-phenylenediamine(MPD)solution and before reacting with trimesoyl chloride(TMC)solution,on the intrinsic separation FO *** separation performance of the dual-layer nanofibrous FO membranes was examined using model foulants(sodium alginate and bovine serum albumin)in both the FS and *** dual-layer nanofibrous substrate was superior to the single-layer nanofibrous substrate and showed a flux of 30.2 L/m^(2)/h(LMH)when using 1.5 mol/L NaCl against deionised(DI)water in the active layer facing draw solution(AL-DS)*** the fouling test,the water flux was effectively improved without sacrificing the water/solute selectivity under the condition that foulants existed in both the FS and *** addition,the dual-layer nanofibrous TFC FO membrane was more robust during the fouling test and cleaning.

关键词： forward osmosis Electro-spinning Interfacial polymerisation Fouling Polyvinylidene fluoride

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