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学者姓名：鄢忠森
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Shale gas is abundant worldwide and has a smaller carbon footprint than conventional coal. However, exploitation of shale gas produces a large amount of hydraulic fracturing wastewater, which hurts the ecological environment. Effective treatment of shale gas produced water (SGPW) is a great challenge and membrane distillation (MD) which is not restricted by salinity is a hot topic in dealing with this wastewater. This paper focused on the influence of feed water quality on performance of direct contact MD by adjusting pH and pretreating. By analyzing MD permeate, controlling the feed water non-alkalinity facilitated MD treatment of SGPW and acidic condition greatly hindered the cross -membrane mass transfer of ammonia nitrogen. Among the traditional pretreatment methods, aluminum coagulant removed 99% of turbidity and exhibited the best superiority in mitigating membrane fouling, whose final flux was 2.2 times the raw SGPW. Dual coagulation and zeolite adsorption reduced ammonia nitrogen by about 50 % and 95 %, whose final permeate conductivities were about 65 % and 62 % of the untreated, respectively. Analyses of attenuated total reflection fourier transform infrared and scanning electron microscope equipped with an energy dispersive spectroscopy confirmed the reduction in membrane fouling after pretreatment of feed water. This study provides guidance for treatment of SGPW using MD.
Keyword ：
Ammonia transfer Ammonia transfer Feed water quality Feed water quality Membrane distillation (MD) Membrane distillation (MD) Membrane fouling Membrane fouling Shale gas produced water (SGPW) Shale gas produced water (SGPW)
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| GB/T 7714 | Lu, Mengzhe , Chang, Haiqing , Yan, Zhongsen et al. Water quality of shale gas produced water greatly influences the performance of membrane distillation [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 341 . |
| MLA | Lu, Mengzhe et al. "Water quality of shale gas produced water greatly influences the performance of membrane distillation" . | SEPARATION AND PURIFICATION TECHNOLOGY 341 (2024) . |
| APA | Lu, Mengzhe , Chang, Haiqing , Yan, Zhongsen , Qu, Fangshu , Zhou, Zhiwei , Liang, Ying et al. Water quality of shale gas produced water greatly influences the performance of membrane distillation . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 341 . |
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Membrane electrochemical reactor (MER) shows superiority to electrochemical oxidation (EO) in high salinity organic wastewater (HSOW) treatment, but requirement of proton exchange membranes (PEM) increases investment and maintenance cost. In this work, the feasibility of using low-cost pressure-driven membranes as the separation membrane in MER system was systematically investigated. Commonly used pressure-driven membranes, including loose membranes such as microfiltration (MF) and ultrafiltration (UF), as well as dense membranes like nanofiltration (NF) and reverse osmosis (RO), were employed in the study. When tested in a contamination-free solution, MF and UF exhibited superior electrochemical performance compared to PEM, with comparable pH regulation capabilities in the short term. When foulant (humic acid, Ca2+ and Mg2+) presented in the feed, UF saved the most energy (43 %) compared to PEM with similar removal rate of UV254 (similar to 85 %). In practical applications of MER for treating nanofiltration concentrate (NC) of landfill leachate, UF saved 27 % energy compared to PEM per cycle with the least Ca2+ and Mg2+ retention in membrane and none obvious organics permeation. For fouled RO and PEM with ion transport impediment, water splitting was exacerbated, which decreased the percentage of oxidation for organics. Overall, replacing of PEM with UF significantly reduce the costs associated with both the investment and operation of MER, which is expected to broaden the practical application for treating HSOW.
Keyword ：
Energy consumption Energy consumption High salinity organic wastewater High salinity organic wastewater Membrane electrochemical reactor Membrane electrochemical reactor Pressure-driven membrane Pressure-driven membrane
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| GB/T 7714 | Yan, Zhongsen , Chen, Xiaolei , Chang, Haiqing et al. Feasibility of replacing proton exchange membranes with pressure-driven membranes in membrane electrochemical reactors for high salinity organic wastewater treatment [J]. | WATER RESEARCH , 2024 , 254 . |
| MLA | Yan, Zhongsen et al. "Feasibility of replacing proton exchange membranes with pressure-driven membranes in membrane electrochemical reactors for high salinity organic wastewater treatment" . | WATER RESEARCH 254 (2024) . |
| APA | Yan, Zhongsen , Chen, Xiaolei , Chang, Haiqing , Pang, Heliang , Fan, Gongduan , Xu, Kaiqin et al. Feasibility of replacing proton exchange membranes with pressure-driven membranes in membrane electrochemical reactors for high salinity organic wastewater treatment . | WATER RESEARCH , 2024 , 254 . |
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The imperative for sustainable urban development necessitates the proper treatment of landfill leachate (LFL), driven by its high level of contaminants. Although membrane distillation (MD) effectively captures non-volatile contaminants, impediments persist in practical implementation in LFL, notably membrane fouling and scaling induced by organic and inorganic substances. These challenges are particularly salient in treating LFL with varying contaminant concentrations contingent upon its age. This study comprehensively investigated the treatment efficiency of direct contact membrane distillation (DCMD) for both young landfill leachate (YLFL) and aged landfill leachate (ALFL), along with an examination of the associated membrane fouling and scaling conditions over a 15-d period. The results demonstrated that chemical oxygen demand (COD) and metal ions in both YLFL and ALFL were effectively retained by DCMD, with rejection rates exceeding 99 %. Nevertheless, escalating membrane fouling led to diminished distillate fluxes, with reductions of 26 %-32 % for YLFL and 63 %-86 % for ALFL. The fouling mechanisms differed between YLFL and ALFL treatments. YLFL primarily induced organic fouling through biopolymers and humic acid (HA), while ALFL introduced inorganic salt ions (e.g., Ca2+ and Mg2+) and organics, resulting in scaling and hybrid organic -inorganic fouling. Acid cleaning proved more efficacious than alkali cleaning for ALFL treatment, as it dissolved ions and disrupting the crystal -organic crosslinked fouling layer. This study sheds new light on membrane fouling control during DCMD-based treatment of LFL at varying ages.
Keyword ：
Crystal-organics combined fouling Crystal-organics combined fouling Direct contact membrane distillation Direct contact membrane distillation Landfill leachate Landfill leachate Membrane fouling Membrane fouling Scaling Scaling
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| GB/T 7714 | Yang, Zhimeng , Lin, Songze , Ye, Linxiong et al. Landfill leachate treatment by direct contact membrane distillation: Impacts of landfill age on contaminant removal performance, membrane fouling and scaling [J]. | DESALINATION , 2024 , 577 . |
| MLA | Yang, Zhimeng et al. "Landfill leachate treatment by direct contact membrane distillation: Impacts of landfill age on contaminant removal performance, membrane fouling and scaling" . | DESALINATION 577 (2024) . |
| APA | Yang, Zhimeng , Lin, Songze , Ye, Linxiong , Qu, Dan , Yang, Haiyang , Chang, Haiqing et al. Landfill leachate treatment by direct contact membrane distillation: Impacts of landfill age on contaminant removal performance, membrane fouling and scaling . | DESALINATION , 2024 , 577 . |
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Membrane distillation (MD), boasting high interception efficiency and low operational pressures, emerges as an innovative membrane technology. However, the occurrence of membrane fouling due to interaction between natural organic matter (NOM) and inorganic ions during the MD process curtails water purification efficiency, thereby constraining its potential applications. To address this quandary, this study integrates sulfate radical-based advanced oxidation processes (SR-AOPs) into MD technology to bolster membrane fouling control. A straightforward hydrothermal method coupled with vacuum filtration was employed to synthesize a Co3O4/Nitrogen-modified carbon quantum dots (NCDs)/PVDF (CN-PVDF) membrane for the first time, which was utilized in the MD treatment of simulated humic acid (HA) wastewater. Under visible light irradiation (1.9 kW/m2), CN-PVDF membrane activation of peroxymonosulfate (PMS) effectively altered the chemical attributes of the MD feed solution and reduced organic matter concentration. Moreover, it dismantled the carboxyl sites on HA that interact with Ca2+, consequently attenuating the formation of organic–inorganic complex pollutants. The XDLVO analysis showcased that photo-Fenton oxidation led to a diminishment in pollutant hydrophobicity, correlating with a 17.59 kT reduction in pollutant-membrane adsorption and a 7.47 kT amplification in adhesion barriers. This strategy transformed the initial two-stage fouling mode into a singular one, which significantly decreased the flux decline and the fouling layer thickness. Furthermore, the CN-PVDF membrane demonstrated self-cleaning capabilities via photo-Fenton. This study advances an innovative approach to bolster the fouling resistance of MD membranes and provides substantial theoretical support for the integration of SR-AOPs and MD technologies. © 2024
Keyword ：
Biogeochemistry Biogeochemistry Chemicals removal (water treatment) Chemicals removal (water treatment) Distillation Distillation Efficiency Efficiency Membrane fouling Membrane fouling Membrane technology Membrane technology Microfiltration Microfiltration Organic compounds Organic compounds Oxidation Oxidation Semiconductor quantum dots Semiconductor quantum dots Sulfur compounds Sulfur compounds Wastewater treatment Wastewater treatment
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| GB/T 7714 | Lu, Zhenyu , Yan, Zhongsen , Chang, Haiqing et al. New insights into antifouling property and interfacial mechanism in photo-Fenton membrane distillation [J]. | Chemical Engineering Journal , 2024 , 492 . |
| MLA | Lu, Zhenyu et al. "New insights into antifouling property and interfacial mechanism in photo-Fenton membrane distillation" . | Chemical Engineering Journal 492 (2024) . |
| APA | Lu, Zhenyu , Yan, Zhongsen , Chang, Haiqing , Wang, Qiankun , Liu, Fujian , Ni, Qichang et al. New insights into antifouling property and interfacial mechanism in photo-Fenton membrane distillation . | Chemical Engineering Journal , 2024 , 492 . |
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Fouling of membranes continues to be a prominent challenge in the membrane distillation (MD) treatment of high salinity organic wastewater (HSOW). Although membrane electrochemical reactor (MER) can effectively inhibit the membrane fouling of MD, the high cost of the proton exchange membrane (PEM) used in MER limits its widespread application. In this study, cost-effective pressure-driven membranes were employed as a substitute for PEM to establish pressure-driven membrane electrochemical reactors for HSOW pre-treatment. By using ultrafiltration membrane (UFM) and reverse osmosis membrane (ROM), UFMER and ROMER were developed, respectively. Due to the superior electrochemical performance of UFM, UFMER saved 43 % of energy compared to PEMER with the highest removal rate of organics (~85 %) in the simulated HSOW treatment. In practical applications, using UFMER significantly reduced the amount and size of complexes in the real nanofiltration concentrate (NC) of landfill leachate. This contributed to the superior specific flux maintenance (97 %) with a salt rejection (>99 %) and the highest recovered specific water flux (99.6 %) in MD cases. UFMER reduced ~27 % of energy compared to PEMER in MER pre-treatment, and saved the most energy (~39.6 %) in MD post-treatment. Hence, this strategy is potential for forthcoming applications, notably in lowering the membrane cost of MER and energy consumption of both MER and MD. © 2024 Elsevier B.V.
Keyword ：
Cost effectiveness Cost effectiveness Distillation Distillation Energy utilization Energy utilization Leachate treatment Leachate treatment Membrane fouling Membrane fouling Membranes Membranes Proton exchange membrane fuel cells (PEMFC) Proton exchange membrane fuel cells (PEMFC) Reverse osmosis Reverse osmosis Wastewater treatment Wastewater treatment
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| GB/T 7714 | Chen, Xiaolei , Yan, Zhongsen , Chang, Haiqing et al. Enhancing membrane distillation efficiency in treating high salinity organic wastewater: A pressure-driven membrane electrochemical reactor approach [J]. | Desalination , 2024 , 582 . |
| MLA | Chen, Xiaolei et al. "Enhancing membrane distillation efficiency in treating high salinity organic wastewater: A pressure-driven membrane electrochemical reactor approach" . | Desalination 582 (2024) . |
| APA | Chen, Xiaolei , Yan, Zhongsen , Chang, Haiqing , Wang, Qiankun , Fan, Gongduan , Ye, Jinghan et al. Enhancing membrane distillation efficiency in treating high salinity organic wastewater: A pressure-driven membrane electrochemical reactor approach . | Desalination , 2024 , 582 . |
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It is a great challenge for effective treatment of shale gas produced water (SGPW), a typical industrial wastewater with complex composition. Single forward osmosis (FO) or membrane distillation (MD) process has been widely used for desalination of SGPW, with membrane fouling not well addressed. Fertilizer draw solution (DS) with high osmotic pressure is less likely to cause FO fouling and can be used for irrigation. An integrated process using fertilizer-driven FO (FDFO) and MD process was proposed for the first time for SGPW treatment, and characteristics of fertilizer DS and powdered activated carbon (PAC) enhancement were assessed. The DS using KCl and (NH4)2SO4 had high MD fluxes (36.8–38.8 L/(m2·h)) and low permeate conductivity (below 50 μS/cm), increasing the contact angle of the MD membrane by 113 % than that without FO, while the DS using MgCl2 and NH4H2PO4 produced a lower reverse salt flux (0.9–3.2 g/(m2·h)). When diluted DS was treated using PAC, the MD permeate conductivity was further reduced to 35 μS/cm without ammonia, and the membrane hydrophobicity was maintained to 71–83 % of the original. The mechanism of the FDFO-MD integrated process for mitigating MD fouling and improving permeate quality was analyzed, providing guidance for efficient SGPW treatment. © 2024 Elsevier Ltd
Keyword ：
Draw solution (DS) Draw solution (DS) Fertilizer Fertilizer Forward osmosis (FO) Forward osmosis (FO) Membrane distillation (MD) Membrane distillation (MD) Shale gas produced water (SGPW) Shale gas produced water (SGPW)
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| GB/T 7714 | Chang, H. , Ma, Z. , Qu, D. et al. Fertilizer-driven FO and MD integrated process for shale gas produced water treatment: Draw solution evaluation and PAC enhancement [J]. | Water Research , 2024 , 266 . |
| MLA | Chang, H. et al. "Fertilizer-driven FO and MD integrated process for shale gas produced water treatment: Draw solution evaluation and PAC enhancement" . | Water Research 266 (2024) . |
| APA | Chang, H. , Ma, Z. , Qu, D. , Yan, Z. , Liang, Y. , Meng, Y. et al. Fertilizer-driven FO and MD integrated process for shale gas produced water treatment: Draw solution evaluation and PAC enhancement . | Water Research , 2024 , 266 . |
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Substantial volumes of hazardous shale gas produced water (SGPW) generated in unconventional natural gas exploration. Membrane distillation (MD) is a promising approach for SGPW desalination, while membrane fouling, wetting, and permeate deterioration restrict MD application. The integration of gravity-driven membrane (GDM) with MD process was proposed to improve MD performance, and different pretreatment methods (i.e., oxidation, coagulation, and granular filtration) were systematically investigated. Results showed that pretreatment released GDM fouling and improved permeate quality by enrich certain microbes’ community (e.g., Proteobacteria and Nitrosomonadaceae), greatly ensured the efficient desalination of MD. Pretreatment greatly influences GDM fouling layer morphology, leading to different flux performance. Thick/rough/hydrophilic fouling layer formed after coagulation, and thin/loose fouling layer formed after silica sand filtration improved GDM flux by 2.92 and 1.9 times, respectively. Moreover, the beneficial utilization of adsorption-biodegradation effects significantly enhanced GDM permeate quality. 100 % of ammonia and 53.99 % of UV254 were efficiently removed after zeolite filtration-GDM and granular activated carbon filtration-GDM, respectively. Compared to the surged conductivity (41.29 μS/cm) and severe flux decline (>82 %) under water recovery rate of 75 % observed in single MD for SGPW treatment, GDM economically controlled permeate conductivity (1.39-19.9 μS/cm) and MD fouling (flux decline=8.3 %-27.5 %). Exploring the mechanisms, the GDM-MD process has similarity with Janus MD membrane in SGPW treatment, significantly reduced MD fouling and wetting. © 2024
Keyword ：
Coagulation Coagulation Granular filtration Granular filtration Gravity-driven membrane (GDM) Gravity-driven membrane (GDM) Membrane distillation (MD) Membrane distillation (MD) Oxidation Oxidation Shale gas produced water (SGPW) Shale gas produced water (SGPW)
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| GB/T 7714 | Ji, Z. , Wang, J. , Yan, Z. et al. Gravity-driven membrane integrated with membrane distillation for efficient shale gas produced water treatment [J]. | Water Research , 2024 , 266 . |
| MLA | Ji, Z. et al. "Gravity-driven membrane integrated with membrane distillation for efficient shale gas produced water treatment" . | Water Research 266 (2024) . |
| APA | Ji, Z. , Wang, J. , Yan, Z. , Liu, C. , Liu, Z. , Chang, H. et al. Gravity-driven membrane integrated with membrane distillation for efficient shale gas produced water treatment . | Water Research , 2024 , 266 . |
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The significant volume and substantial pollutant load in produced water (PW) pose challenges for the environment, thus necessitating exploration of appropriate treatment techniques. Though single oxidation or membrane methods exhibit effectiveness and individual merits, significant challenges persist in practical PW treatment. The efficacy of oxidation-membrane treatment trains in mitigating membrane fouling and enhancing permeate quality have been recognized. However, a significant deficiency lies in the discussion concerning the actual treatment performance and the synergistic effects between oxidation and membranes. Three typical hybrid methods integrating oxidation and membranes were proposed based on their individual performance, with the aim of facilitating PW beneficial reuse and achieving zero liquid discharge. Moreover, the state-of-theart treatment behaviors and the mechanisms for fouling alleviation were systematically evaluated. In particular, pre-ozonation-ultrafiltration/microfiltration stands out as the predominantly researched treatment method, whereas oxidation-nanofiltration/reverse osmosis has received limited research attention. Oxidation proved effective in removing both organic and reductive inorganic compounds from PW. After oxidation, the quality of PW can be significantly improved to cause less fouling in the following membrane steps. Additionally, effect of PW constituents on oxidation efficiency, oxidation-membrane, the compatibility of the oxidation-membrane hybrid process, management of hazardous hazardous byproducts disposal, and economic feasibility were proposed as the future research directions.
Keyword ：
Fouling alleviation Fouling alleviation Membrane Membrane Oxidation Oxidation Produced water (PW) Produced water (PW) Synergistic effects Synergistic effects
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| GB/T 7714 | Ji, Zhengxuan , Wang, Jiaxuan , Yan, Zhongsen et al. Integrated oxidation and membrane processes for produced water treatment: An overview and challenges [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 351 . |
| MLA | Ji, Zhengxuan et al. "Integrated oxidation and membrane processes for produced water treatment: An overview and challenges" . | SEPARATION AND PURIFICATION TECHNOLOGY 351 (2024) . |
| APA | Ji, Zhengxuan , Wang, Jiaxuan , Yan, Zhongsen , Liu, Bin , Liu, Zhe , Chang, Haiqing et al. Integrated oxidation and membrane processes for produced water treatment: An overview and challenges . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 351 . |
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Membrane distillation technology, utilized for treating hypersaline wastewater from seawater desalination, often encounters challenges related to inorganic scaling, adversely affecting membrane performance. Herein, we introduce a innovative approach employing a sacrificial layer on the surface of Thin Film Composite (TFC) membranes to concurrently enhance inorganic scaling resistance and facilitate membrane reusability. The sacrificial layer (Fe3+-TA) consisted of tannic acid (TA) complexed with iron ions (Fe3+) and could be removed and regenerated in situ. The results demonstrated that the Fe3+-TA layer significantly improved the membrane's surface smoothness and densification, maintaining superior anti-scaling performance. The modified membrane exhibited remarkable durability, sustaining six reuse cycles with a flux recovery exceeding 97 % in gypsum scaling tests. Furthermore, the formation of new complexes during gypsum scaling tests confirmed the membrane's augmented scaling retardation capabilities. Thus, integrating of a sacrificial layer into TFC membranes presents a promising strategy for advancing membrane distillation processes in hypersaline wastewater treatment. © 2024 Elsevier B.V.
Keyword ：
Anti-scaling Anti-scaling Inorganic scaling Inorganic scaling Membrane distillation Membrane distillation Reuse Reuse Sacrificial protective layer Sacrificial protective layer
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| GB/T 7714 | Yan, Z. , Lin, S. , Chang, H. et al. Functional of thin-film composite Janus membrane with sacrificial layer for inorganic scaling control in membrane distillation [J]. | Journal of Membrane Science , 2024 , 710 . |
| MLA | Yan, Z. et al. "Functional of thin-film composite Janus membrane with sacrificial layer for inorganic scaling control in membrane distillation" . | Journal of Membrane Science 710 (2024) . |
| APA | Yan, Z. , Lin, S. , Chang, H. , Xu, J. , Dai, W. , Qu, D. et al. Functional of thin-film composite Janus membrane with sacrificial layer for inorganic scaling control in membrane distillation . | Journal of Membrane Science , 2024 , 710 . |
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Membrane distillation (MD) offers promise for recycling shale gas produced water (SGPW), while membrane fouling is still a major obstacle in standalone MD. Herein, sodium percarbonate (SPC) oxidation was proposed as MD pretreatment, and the performance of the single MD, SPC-MD hybrid process and Fe(II)/SPC-MD hybrid process for SGPW treatment were systematically evaluated. Results showed that compared to raw SGPW, the application of SPC and Fe(II)/SPC led to the decrease of the fluorescent organics by 28.54 % and 54.52 %, respectively. The hydrophobic fraction decreased from 52.75 % in raw SGPW to 37.70 % and 27.20 % for SPC and Fe(II)/SPC, respectively, and the MD normalized flux increased from 0.19 in treating raw SGPW to 0.65 and 0.81, respectively. The superiority of SPC oxidation in reducing the deposited membrane foulants and restoring membrane properties was further confirmed through scanning electron microscopy observation, attenuated total reflection fourier transform infrared, water contact angle and surface tension analyses of fouled membranes. Correlation analysis revealed that hydrophobic/hydrophilic matters and fluorescent organics in SGPW took a crucial role in MD fouling. The mechanism of MD fouling mitigation by Fe(II)/SPC oxidation was attributed to the decrease in concentrations and hydrophobicity of organic by synergistic oxidation, coagulation and adsorption. © 2024 Elsevier Ltd
Keyword ：
Fe(II) Fe(II) Membrane distillation (MD) Membrane distillation (MD) Membrane fouling Membrane fouling Shale gas produced water (SGPW) Shale gas produced water (SGPW) Sodium percarbonate (SPC) oxidation Sodium percarbonate (SPC) oxidation
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| GB/T 7714 | Gu, S. , Qu, F. , Qu, D. et al. Improving membrane distillation performance by Fe(II) activated sodium percarbonate oxidation during the treatment of shale gas produced water [J]. | Water Research , 2024 , 262 . |
| MLA | Gu, S. et al. "Improving membrane distillation performance by Fe(II) activated sodium percarbonate oxidation during the treatment of shale gas produced water" . | Water Research 262 (2024) . |
| APA | Gu, S. , Qu, F. , Qu, D. , Yan, Z. , Meng, Y. , Liang, Y. et al. Improving membrane distillation performance by Fe(II) activated sodium percarbonate oxidation during the treatment of shale gas produced water . | Water Research , 2024 , 262 . |
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