JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Feng-jiao Li,Yu-xiang Jia,Ting-ting Bai,Meng Wang
Nowadays, the reclamation of industrial waste acid characterized with low acid concentration and high metal ion content has attracted much attention. How to carry out effectively a separation between protons and metal ions becomes a top priority. In this report, a so-called proton permselective composite membrane was prepared specifically for waste acid reclamation by electrodialysis . Above all, a porous supporting membrane was prepared from polysulfone via classical wet phase inversion technology. Therein appropriate amount of sulfonated polysulfone (SPSF) was added to adjust its microstructure. Subsequently, a hydrophilic composite layer, such as Poly(ethylene imine) layer or Poly(vinyl alcohol) layer, was used to endow the proton permeability based on the unique transport mechanism of protons in which water molecules play an important role. ATR-FTIR and SEM were employed to monitor the changes in chemical composition and microstructure of as-prepared membranes, respectively. Furthermore, their electrodialytic transport properties, including electrical resistance, limiting current, water transport behaviors, proton permselectivity and anion-blocking ability, were investigated and compared with those of typical commercial cation-exchange membrane. As confirmed by series of electrochemical characterizations, as-prepared composite membranes, especially PVA-Series membranes, exhibited outstanding work performances and remarkable practical value in the acid recovery. At last, the ion substitution electrodialysis for waste acid reclamation in which typical composite membranes were assembled were also conducted to examine the process energy consumption, the concentration and purity of the produced acid.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yayue Lv,Sifan Wu,Junbin Liao,Yangbo Qiu,Jun Dong,Chunhong Liu,Huimin Ruan,Jiangnan Shen
Currently, water shortage has been emerged as a severe problem in human life. In this work, a zero liquid discharge technology was proposed combining macroporous resin adsorption and desorption, bipolar membrane electrodialysis (BMED) and electrodialysis (ED). During the process of resin adsorption and desorption, the adsorption capacity of the resin and the concentration of the desorption solution were investigated. In addition, the power supply, volume ratio, membrane type in BMED/ED processes were investigated. According to the results of the study, the eluting agent solution of 4% NaOH was the optimal content, with a desorption rate of 97.49%. In the BMED process, the acid/base concentration reached 1.25 mol/L and 0.85 mol/L, respectively. During ED process, the final concentration of NaOH was 0.14 mol/L, and the COD rejection rate reached 93.3%. In the whole work, the NaOH and the macroporous resin were recycled, which achieved the closed-loop zero liquid discharge of salt recycling and reuse in wastewater. Furthermore, techno-economic analysis (0.79 $/kg, 0.21 $/kg) and water recovery rate calculations (96%, 83%) were carried out for the BMED and ED processes, which demonstrated that the process was promising for industrial application.
研究领域:
环境科学
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化工工程
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水处理技术
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2021
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IF 5.485
Gongyi Jiang,Hongdi Li,Meng Xu,Huimin Ruan
In this work, a combination zero liquid discharge of reverse osmosis (RO), electrodialysis (ED) and bipolar membrane electrodialysis (BMED) for salt recovery and acid/base production is proposed for the treatment of cold-rolling wastewater. In ED concentrating process, parameters such as the most suitable voltage drop, membrane type and volume ratio were investigated according to concentration factor, energy consumption and water transport. The results indicated that the CMX/AMX stack showed good concentration factor of 2.19 in first-stage ED, and that the average flux of Na 2 SO 4 approached a high value (4.94 mol/m 2 h) at voltage drop of 12 V. Furthermore, an optimal volume ratio of 4:1 was selected for two-stage ED process. The concentration factor could approach 5.14 through two-stage ED (V d :V c = 4:1), while the energy consumption was 61.88 kW h/m 3 with second-stage ED. As result of BMED application, the Na 2 SO 4 -containing ED concentrate solution was sucessfully desalinated for acid/base production and pure water generation. The generated NaOH concentration can increased up to 2.03 mol/L with BP-1E/AMX/CMX stack (V f :V b :V a = 5:3:3). The results demonstrated that the hybrid RO-ED-BMED process has potential applicability for the sustainable treatment of cold-rolling wastewater.
研究领域:
环境工程
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水处理
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膜技术
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废水管理
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可持续工程
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产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Mingzhi Lv,Yaoxing Liu,Jie Jiang,Rui Lian,Hun Xue,Riyao Chen,Rui Ding,Jianxi Liu
With the development of industrial civilization, large amounts of wastewater containing boron and zinc are being produced. Such wastewater poses a great threat to human health if discharged without treatment. In this study, an integrated technology of electrodialytic metathesis (EDM) and a hydrothermal process was utilized to recover boron and zinc from wastewater in the form of zinc borate (Zn 2 B 6 O 11 ·3H 2 O). Experimental results showed that electrolyte concentration , current density , and initial boron and zinc concentration clearly affected the recovery ratios for B 4 O 7 2− and Zn 2+ and their corresponding specific energy consumption and current efficiencies . Under the optimal experimental conditions (an electrolyte concentration of 1.0 mol/L in the recycling compartment in the experimental setup, a current density of 15 mA/cm 2 , initial ZnSO 4 and Na 2 B 4 O 7 concentrations of 0.1 mol/L, and a flow rate of 20 mL/min), the recovery ratio, specific energy consumption, and current efficiency were 85.6 %, 6.5 kW·h/mol, and 12.3 %, respectively, for recovering B 4 O 7 2− and 80.6 %, 1.7 kW·h/mol, and 45.7 %, respectively, for recovering Zn 2+ . When one recovery compartment was employed, the current efficiencies for recovering B 4 O 7 2− and Zn 2+ were 12.3 % and 45.7 %, respectively, and these values were 11.4 % and 43.8 %, respectively, when two recovery compartment were used. After B 4 O 7 2− and Zn 2+ concentrated by EDM were treated via a hydrothermal process, a white precipitate was produced. The results of X-ray diffraction, Fourier transform infrared spectroscopy , and thermogravimetric analyses showed that this precipitate exhibited physicochemical properties similar to those of commercial Zn 2 B 6 O 11 ·3H 2 O. Thus, the integrated technology can be regarded as an effective method for recovering boron and zinc from wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Yuting Yuan,Xu Zhang,Li Liu,Haofan Wang,Zhiqi Bao,Yahua Liu,Chenxiao Jiang,Bin Wu
Bipolar membrane electrodialysis (BMED) efficiently transforms salts into acids and bases, with bipolar membranes (BPMs) playing a pivotal role. This study pioneers high-performance BPMs via a layer-by-layer casting/spraying technique, incorporating sulfonated polysulfone cation-exchange layers, polydopamine-modified MXene (PDA-Ti 3 C 2 T X ) interfacial layers, and quaternized polyphenylene oxide anion-exchange layers. PDA-Ti 3 C 2 T X exhibits remarkable catalytic activity, promoting water dissociation. The BPMs exhibit exceptional interfacial compatibility, alkali resistance, and long-term durability. At 80 mA · cm −2 , the BPMs manifest reduced transmembrane voltages (1.54 ∼ 2.80 V) compared to control samples (Blank BPM: 7.70 V; 0.75 %-Ti 3 C 2 T X -BPM: 5.51 V). Post-BMED salt conversion, the 1.00 %-PDA-Ti 3 C 2 T X -BPM displays the lowest final voltage drop (9.9 V), akin to the commercial SSBP-1 (9.8 V). The 0.75 %-PDA-Ti 3 C 2 T X -BPM attains the highest OH – concentration (0.094 mol·L -1 ) and current efficiency (98.79 %), surpassing SSBP-1 (0.090 mol·L -1 , 94.47 %). The BPMs demonstrate superior energy consumption (2.00 ∼ 2.49 kWh kg −1 ) compared to SSBP-1 (2.94 kWh kg −1 ). This investigation delineates efficient and stable BPMs for BMED applications.
研究领域:
材料科学
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化学工程
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环境工程
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产品关联
DOI
高影响因子
DESALINATION
·
2025
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IF 9.8
Xiao Ge,Baole Li,Xiang Meng,Tiansheng He,Tianchi Li,Qi Yang,Zheng Wei,Taihong Yan,Zhongwei Yuan
In recent years, acetohydroxamic acid (AHA) has gained significant attention as a novel organic salt-free reagent in the reprocessing of the spent nuclear fuel. However, the primary byproduct of the AHA in the process, acetic acid (HAC), is difficult to destroy during the heating. It tends to evaporate along with nitric acid, which can contaminate the recovered nitric acid and affect its reuse. This study utilizes a multi-stage electrodialysis process to separate nitric acid from acetic acid, exploiting differences in their ionization degrees and ion migration speeds under an external electric field. The effects of current, type of reflux solution, reflux flow rate, and the number of reflux stages on the purity and recovery of nitric acid were examined. Results indicated that under the same reflux condition, increasing the current, raising the reflux flow rate or the concentration of solution could enhance the recovery rate of nitric acid. The purity of nitric acid products could reach 99.88 % at the two-stage reflux using nitric acid as a reflux solution. And a high recovery rate on the nitric acid of 97.48 % also could achieve, which meets the criteria for nitric acid reuse in the reprocessing of the spent nuclear fuel.
研究领域:
化学工程
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核燃料再处理
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产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 5
·129
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IF 3.6
Shichang Xu,Long Zhang,Zhen Zhang,Lixin Xie,Wen Zhang
In this study, the integrated process of reverse osmosis (RO) and electrodialysis (ED) is developed to concentrate the dilute solution of acetic acid (HAc). The key parameters, such as RO pressure, ED voltage, and ED volume ratio, were systematically evaluated and the operation conditions of the processes were optimized. Under an operating pressure of 5 MPa, RO can enrich low-concentration HAc from 1.5 wt.% to 6.5% wt.% and the energy consumption is 0.37 kW·h·kg−1. Next, RO-concentrated water was used as the ED feed and the first ED with a volume ratio of the concentrated to dilute chamber of 1:4 was carried out under the conditions of a flow rate of 30 L/h and an operating voltage of 12 V; the HAc concentration reached 12.50 wt.%. The second ED with a volume ratio of 1:5 made the final HAc concentration reach 19.02 wt.%. This study shows that using RO-concentrated water instead of initial water for the ED process can reduce water energy consumption and cost markedly, and the RO–ED integrated process can efficiently pre-enrich low-concentration HAc aqueous solution, and the enriched HAc concentration meets the requirements for the further distillation of HAc.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 26
·19807-19817
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IF 3.84
Yun Zheng,Xueli Gao,Xinyan Wang,Zhaokui Li,Yuhong Wang,Congjie Gao
In this study, a laboratory-scale electrodialysis (ED) system with an effective area of 88 cm2 was used to remove copper and cyanide in simulated and real gold mine effluents. The membrane fouling was characterized by FTIR, SEM-EDX, membrane resistance measurements and static contact angle. The effects of applied voltage, initial concentration, and flux rate on the removal rate of copper and cyanide were investigated. The highest copper (99.41%) and cyanide (99.83%) removal rates were achieved under the following conditions: applied voltage of 25 V, initial concentration of C2 (concentration of copper and cyanide were 47 mg L−1 and 242 mg L−1), and a flux rate of 4.17 mL s−1. In addition, the lowest concentration of copper (0.44 mg L−1), cyanide (0.48 mg L−1) and zinc (0.34 mg L−1) in the treated effluent were all below regulatory limits (copper, cyanide <0.5 mg L−1, zinc <2.0 mg L−1). The results showed the presence of CuCN, [Cu(CN)3]2−, Cu(OH)2, and Zn(OH)2 in the precipitate, and the fouling of anion-exchange membranes (AEMs) could be decreased significantly via pH adjustment. This research provides a new insight into the removal of copper and cyanide from gold mine effluent.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
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IF 2.627
Hanxiao Du,Lixin Xie,Jie Liu,Shichang Xu
The absorption process in acrylic acid production was water-intensive. The concentration of acrylic acid before distillation process was low, which induced to large amount of wastewater and enormous energy consumption. In this work, a new method was proposed to concentrate the side stream of absorption column and thus increase the concentration in bottom product by electrodialysis . The influence of operating conditions on concentration rate and specific energy consumption were investigated by a laboratory-scale device. When the voltage drop was 1 V·cP −1 (1 cP=10 −3 Pa⋅S), flow velocity was 3 cm·s −1 and the temperature was 35 °C, the concentration rates of acrylic acid and acetic acid could be 203.3% and 156.6% in the continual-ED process. Based on the experimental data, the absorption process combined with ED was simulated, in which the diluted solution from ED process was used as spray water and the concentrated solution was feed back to the absorption column. The results shown that the flow rate of spray water was decreased by 37.1%, and the acrylic acid concentration at the bottom of the tower was increased by 4.56%. The ions exchange membranes before and after use 1200 h were tested by membrane surface morphology (scanning electron microscope), membrane chemical groups (infrared spectra), ion exchange capacity, and membrane area resistance, which indicated the membrane were stable in the acid system. This method provides new method for energy conservation and emission reduction in the traditional chemical industry.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Qiuyue Wang,George Q. Chen,Lin Lin,Xiaoyan Li,Sandra E. Kentish
The feasibility of using electrodialysis with bipolar membranes (EDBM), combined with monovalent selective anion exchange membranes was investigated to purify organic acids from fermentation broths or wastewater streams. A simulated beet molasses feed containing a mixture of monobasic lactic acid and polybasic citric acid was used for this purpose. The impact of the feed pH, the configuration of the membrane stack and the voltage applied on the selectivity of the process was investigated. At a pH of 9–10 and an electric field intensity of 9 V/cm, a lactic acid product with a purity of at least 97% can be obtained by using both two chamber (BP-A) and three chamber (BP-A-C) configurations with the monovalent selective membrane. When using the BP-A configuration, the hydroxide ions generated by the bipolar membrane compete with the lactate anions to move into the acid solution and so the energy efficiency is lower than with the BP-A-C configuration. To mimic a multiple pass process and increase the lactic acid concentration of the final product, experiments were performed across a range of volume ratios between the feed and acid solutions. As this ratio is varied, the purity of lactic acid produced remains higher than 95% while the energy consumption is essentially unaffected. Due to the osmotic flow of water during experiments, the highest lactic acid concentration that can be achieved is limited to 153 g/L at a volume ratio (V A : V F ) of 1:10.
研究领域:
生物工程
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环境科学
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产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Shishuo Wang,Fei Guo,Xuemei Wu,Yuandong Jia,Gaohong He,Xiaobin Jiang
Lithium and its compounds are critical strategic resources with wide-ranging applications. This study developed a bipolar membrane precipitation coupled electrodialysis enrichment (BMp-EDe) process for extracting lithium from brines with an Mg/Li ratio of 20. The method is based on phase separation achieved through precipitation-coupled ion permeation and a synergistic mechanism for ion enrichment, resulting in significant process intensification. Key factors such as current density, molar ratio between diluate and base chambers, and base chamber concentration were optimized to control nucleation and prevent membrane fouling. Under conditions of current density ranging from 200 to 400 A·m −2 and a molar ratio of the diluate chamber to the base chamber between 13 and 16, the magnesium removal rate in the BMp-EDe process is found to exceed 99.90 %, with a separation factor greater than 20,000. The optimal separation factor is observed to reach 40,244, with a magnesium removal rate as 99.96 % and a lithium recovery rate as 95.32 %. With optimized operation conditions, the energy consumption of magnesium precipitation decreased from 11.89 kWh·kg −1 (Mg 2+ ) to 7.97 kWh·kg −1 (Mg 2+ ). Thus, an alternative method is presented that employs commercial bipolar membranes to achieve ultra-high magnesium‑lithium separation efficiency. Additionally, a mechanism for the continuous operation of the magnesium precipitation chamber is validated, which can effectively prevent membrane fouling.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Boqiang Li,Fei Yang,Baiyang Chen,Juan Li,Lijuan Zhu,Wen-Tao Li
Dissolved organic nitrogen (DON) plays a key role in many biogeochemistry and engineering processes such as forming nitrogenous disinfection byproducts . However, detecting aqueous DON at trace levels is challenging currently because conventional DON conversion methods have very high method detection limits (MDL). In addition, DON is measured indirectly by subtracting dissolved inorganic nitrogen (DIN) from total dissolved nitrogen (TDN), which can propagate analytical errors of each analyte. In order to solve these issues, we isolated DON from DIN with electrodialysis before and herein tested vacuum ultraviolet (VUV) in tandem with several oxidants to convert DON completely into nitrate for subsequent N analysis. Results showed that H 2 O 2 was more suitable than chlorine and persulfate because VUV/chlorine or VUV/persulfate is either inefficient to convert DON or subjected to nonnegligible N loss. To verify the efficiency, we evaluated the effects of typical water and operating variables on the conversions of four model DON compounds and their yields of nitrate. Under optimal conditions (pH 10.3 and 500 mg/L H 2 O 2 ), the process converted DON completely into nitrate within just 60 min. Compared to conventional TDN analytical methods, the VUV/H 2 O 2 method features not only better analytical precision but also lower MDL because the formed nitrate can be analyzed at very low MDL by ion chromatography (IC). So, this approach moves one step further to achieve a conceptually new DON analytical method by coupling electrodialysis, VUV/H 2 O 2 , and IC.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）