Nature Water
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2025
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IF 24.1
Chen Yuanmiaoliang,Wang Longchao,del Cerro Martina,Wang Li,Zhang Xuan,Elimelech Menachem,Wang Zhangxin
High-salinity organic wastewaters pose a major challenge for conventional wastewater treatment processes. Here we propose dialysis as an innovative solution to overcome this challenge. Dialysis uses an ultrafiltration (UF) membrane that allows the passage of salts while rejecting the organic substances, operating in a bilateral countercurrent flow mode without the application of hydraulic pressure. Using bench-scale experiments and a model for salt and water transport in leaky membranes, we demonstrate that dialysis can effectively desalinate high-salinity organic wastewaters without diluting the wastewater stream. By comparing the salt/organic selectivity of dialysis and UF using the same membrane, we show that dialysis can effectively fractionate salts and organic substances in high-salinity organic wastewaters. Additionally, we find that, unlike UF, dialysis is almost unaffected by membrane fouling, highlighting its excellent fouling resistance. We conclude by proposing potential high-salinity organic wastewater treatment schemes based on dialysis, paving the way for more sustainable and effective management of challenging wastewaters.
研究领域:
环境科学
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水处理技术
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膜分离技术
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产品关联
DOI
高影响因子
FUEL
·
2022
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IF 8.035
Ruikun Wang,Zhaohua Lin,Pingbo Peng,Shiteng Tan,Zhenghui Zhao,Qianqian Yin,Chunbo Wang
Reusing the wastewater byproduct of the hydrothermal carbonization (HTC) process as a water source to prepare biomass slurry feedstock for the next HTC run provides a feasible wastewater disposal method. However, the influence of various organic components contained in the hydrothermal wastewater (HW) on the formation routes and characteristics of hydrochar is yet to be clarified. In this study, five representative organic components, phenol, acetic acid, furfural, 5-hydroxymethylfurfural (5-HMF), and 2,5-hexanedione, were selected to study their effects on the hydrochar fuel characteristics and HW components, based on which the hydrochar formation pathways in an organic wastewater environment were proposed. The phenol, furfural, and 5-HMF contained in the wastewater source could polymerize with the active intermediates from biomass degradation, thereby resulting in an increase in the hydrochar mass yield (HCY) by 1.13%–7.07% and an increase in the higher heating value of hydrochar to 27.36 MJ/kg. In contrast, the acetic acid and 2,5-hexanedione contained in the wastewater source resulted in a decrease in HCY, probably because of the catalytic effects of volatile fatty acids on biomass hydrolysis. Moreover, wastewater sources with all five organic components increased the energy recovery efficiency from biomass to a high level of 97.28% under the two effects of deep polymerization and catalytic carbonization.
研究领域:
能源与环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
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IF 6.7
Dongzheng Wang,Guo Yang,Caiyi Jiang,Xingyong Liu,Bo Xing,Min Li,Yi Wang,Fuping Zhang,Xiaolin Shi,Qian Zhou
Polyvinylidene fluoride (PVDF) membrane in-situ coupling catalytic oxidation technology holds great promise as a means to mitigate membrane fouling. However, its application is constrained by several factors, including the inherent incompatibility with inorganic nanoparticles, unsatisfactory hydrophily, and limited catalytic capacity. In this study, a novel in-situ coupling Fenton membrane catalyst with high permeability and anti-fouling capacity was processed based on highly efficient FeNi-LDHs@Cellulose. The performance evaluation exhibit that pure water flux and TOC removal efficiency increased from 556.81 L·m −2 ·h −1 , 65.42% to 665.24 L·m −2 ·h −1 , 99.03 % while rate of Irreversible contamination (Rir) decreased from 42 % to 11.7 %, respectively. After 5 cycles, the pure water flux decreased from 665.24 L·m −2 ·h −1 to 471.13 L·m −2 ·h −1 , and the TOC removal efficiency and flux recovery rate (FRR) still remained above 90%. In addition, further mechanistic insights by pollution model, extended Derjaguin-Landau-VerweyOverbeek (XDLVO), Three-dimensional fluorescence (3D-EEM) and EPR verified that anti-fouling mainly attribute to high hydrophilicity and in-situ decomposition pollutants. Meanwhile, the decomposition mechanism of pollutants and generation path of OH and 1 O 2 were proposed. This research provides insights for further improving the permeability and anti-fouling performance of PVDF membrane in the field of treatment organic wastewater by combining organic with inorganic nanoparticles.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Haohang Fang,Qianqian Yu,Di Xie,Yiyan Cai,Jianping Sun,Boxi Chen,Houkai Huang,Xin Li,Siyang Dai,Shaohong Shi,Yiqiang Wu,Fangchao Cheng
Membrane filtration technology demonstrates excellent continuous processing capability in organic wastewater treated processes, which is usually applied in continuous industrial processes. However, it still faces a contradiction between membrane flux and treatment efficiency. In this study, a flexible wood-based photocatalytic membrane with high membrane flux and exceptional photofenton performance was developed via partial fragment wood components and uniform loading of multi-metal oxide nanocatalysts, which breaks mentioned contradiction. The homogeneous and efficient wood-based dual-function water filtration/photofenton system was established by leveraging the directional porous structure of wood in conjunction with the nanocatalysts while adjusting their ratios, enabling effective purification of highly concentrated mixed organic wastewater. Under one solar intensity and negative pressure filtration (0.03 MPa), the system treated a mixed solution containing Rhodamine B, phenol , and tetracycline at a concentration of 280 mg L −1 with the removal efficiencies of 100 %, 93.4 %, and 90.2 %, respectively, and the membrane flux could up to 315.3 Lm −2 h −1 within one hour. The membrane showed a good recycling performance, and the decay rates were all below 5 % after five cycles. This wood-based dual-function water filtration/photo-Fenton system provides a new approach for the continuous dynamic treatment of high-concentration organic wastewater on an industrial scale.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Zonglin Pan,Fangpeng Yu,Lin Li,Ming Liu,Chengwen Song,Jiawei Yang,Hanxu Li,Chunlei Wang,Yanqiu Pan,Tonghua Wang
Electrochemical filtration membranes are highly effective for wastewater treatment. However, their relatively high production cost may limit their large-scale production and industrial application. In this work, a low-cost and efficient electrochemical filtration carbon membrane (ECM) was developed via a simple method using coal as the precursor and relying on its self-bonding property. The effects of raw coal blending ratio, carbonization temperature and the addition of pore former on the performance of ECMs were systematically studied. The electrochemical filtration efficiency of the ECM was evaluated using four typical organic pollutants (phenol, bisphenol A (BPA), tetracycline (TC) and rhodamine B (RhB)). Finally, the oxidation mechanism of the ECM was also explored. The high caking property of the raw coal resulted in high mechanical strength ECMs but also led to low porosity and small pore size, which may cause high hydraulic resistance. The overall performance of the ECMs was improved by using blended coal samples as raw materials. The ECM obtained by the optimal preparation conditions exhibited a porosity value of 51.83%, mean pore width of 0.88 μm, mechanical strength of 78.8 N, electrical resistivity of 33.91 mΩ cm and high permeability (393.17 L·m −2 ·h −1 ·bar −1 ). Under a cell potential of 2.0 V, the removal rates of the ECM for all four pollutants were greatly enhanced by electrochemical oxidation, and the electrochemical oxidation activity of the ECM involve both direct and indirect oxidation. Overall, these results demonstrated the potential applicability of ECMs for large-scale production and organic wastewater treatment.
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
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
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IF 10.8
Hongchao Li,Xinyue Zhang,Shuai Yang,Yibing Sun,Jieshu Qian
Significant efforts have recently been exerted toward construction of singlet oxygen (1O2)-dominated catalytic oxidation systems for selective removal of organic contaminants from wastewater, with peroxides serving as the chemical source. However, the relevance of 1O2 in the removal of pollutants remains ambiguous and requires elucidation. In this study, we scrupulously exclude the significant role of 1O2 in contaminant degradation in various peroxymonosulfate (PMS) activation systems. Multiple experimental results indicate that the activation of PMS catalyzed by CuO, MnO2, Fe-doped g-C3N4 (Fe–CN), or N-doped graphite does not predominantly follow the 1O2 pathway. More importantly, the reactivity of 1O2 is remarkably overestimated in the literature, given its inferior capacity in degradation of a range of heterocyclic contaminants and aromatic compounds possessing electron-withdrawing groups. In addition, the strong physical quenching effect of water, coupled with the low oxidizing ability of 1O2, would notably reduce the utilization efficiency of peroxide, which is particularly apparent in the degradation of micropollutants. We reckon that this study is expected to end the long-running dispute associated with the relevance of 1O2 in pollutant removal.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Sijia Liu,Xifei Zhou,Changqing Yang,Chaohai Wei,Yun Hu
The extensive use of sacrificial agents and the low carrier separation and utilization efficiency remain important factors limiting the development of photocatalytic hydrogen production . We report a three-layered, dual-functional photocatalysts of Cu atomics@UiO-66-NH 2 (U6N)/ZnIn 2 S 4 nanosheets (ZIS), for the simultaneous production of photocatalytic hydrogen and degradation of organic pollutants . When common and highly toxic organic pollutants (phenolic compounds and antibiotics) were substituted for the sacrificial agents, Cu@U6N/ZIS exhibited superior sustained hydrogen production, approximately 28 times greater than that of pure ZIS. The experimental results suggested that the window size of U6N (< organic pollutants molecular size) separates the reaction sites of organic pollutants oxidation and reduction of hydrogen ions (H + ), thereby achieving spatial separation of redox sites. Besides, the structure of Cu@U6N/ZIS, which was anchored Cu within U6N and encapsulated by ZIS nanosheets, forming Z-type heterojunctions, achieved the control of the directional transfer of photogenerated electrons. And the coupled system can effectively enhance water quality by reducing the biological toxicity of the wastewater. This study suggests new avenues for environmental restoration and non-fossil fuel production.
研究领域:
环境科学
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能源科学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
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IF 8.8
Linsong Cheng,Yuanxiang Mao,Lei Jiang,Rui Ma,Jiangsen Ma,Yiyuan Zhuo,Qiushi Shen,Caocong Liu,Liuwei Zhao,Xiaoyi Xu,Fangying Ji
The high concentration of salt in organic wastewater has a strong inhibitory effect on the removal of pollutants. A method for the efficient removal of trace pollutants in high-salinity organic wastewater was developed. This study investigated the effect of the combination of permanganate [Mn(VII)] and calcium sulfite [S(IV)] on pollutant removal in hypersaline wastewater . The Mn(VII)-CaSO 3 system removed more pollutants from high-salinity organic wastewater than from normal-salinity wastewater. Chloride (increasing from 1 M to 5 M) and low concentration of sulfate (increasing from 0.05 M to 0.5 M) significantly enhanced the system's resistance to pollutants under neutral conditions. Despite the fact that Cl − can combine with the free radicals in the system and reduce their efficiency in removing pollutants, the presence of chloride ions greatly enhances the electron transfer rate in the system, promoting the conversion of Mn(VII) to Mn(III) and significantly increasing the reaction rate of Mn(III) as the primary active species. Therefore, chloride salts can greatly enhance the removal of organic pollutants by Mn(VII)-CaSO 3 . Although sulfate does not react with free radicals, a high concentration of sulfate (1 M) will affect the formation of Mn(III), which greatly weakens the removal effect of the entire system on pollutants. The system can still have a good pollutant removal effect with mixed salt. Altogether, this study demonstrates that the Mn(VII)-CaSO 3 system offers new possibilities for the treatment of organic pollutants in hypersaline wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2023
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IF 2.8
Qian He,Huixia Chen,Haiyan Tang,Jiyuan Sun,Hongbin Xu,You Zhang
The lightweight aggregate ceramsite (LAC) was prepared from by-product sulfate salt slag (BPSS) of high-salt organic wastewater with fly ash. The BPSS fixation rate, leaching toxicity, morphological structures and potential environmental risks of heavy metals in LAC were investigated. BPSS can be fixed in LAC when the mass ratio of Fly ash: Kaolin: clay was 7:1:2, the addition of BPSS was 28%, the heating rate was 8°C min−1, and the calcination temperature was 1100°C. The characteristics of the LAC met the requirements for Chinese lightweight aggregate standards (GB/T17431.2-2010). The Total Organic Carbon (TOC) content of the aqueous leaching liquor in LAC was less than 0.5 mg·L−1. And the fixation rate of heavy metal was more than 99%, which meets the requirements of GB 5085.3-2007. The BPSS immobilization mechanisms were mainly related to the formation of new crystal phases, including Leucite (KAlSi2O6), Albite (Na2O·Al2O3·6SiO2), Potash Feldspar (K2O·Al2O3·6SiO2), Jadeite (NaAlSi2O6), Hauyne ([Na,Ca]8[Si,Al]12O24[SO4]2), Nosean (Na8Al6Si6O24SO4), and Sodalite (Na8Al6Si6O24[MnO4]2) by incorporation of heavy metals in high-temperature curing reaction. This work provides an effective method for the harmless treatment and recycling of by-product salt residues from high-salt organic wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yanjie Niu,Jie Xu,Liqing Chen,Sixi Guo,Fanhui Guo,Yixin Zhang,Jianjun Wu
As a typical coal-based solid waste, coal gasification fine slag (GFS) will have an annual discharge of more than 50 million tons in 2025 in China alone. However, the difficulty of its resource utilization lies in the precise separation of carbon and ash due to their complex distribution pattern. There is an urgent need to develop GFS-based materials for comprehensive utilization of carbon and ash. In this study, a combined process of acid leaching and pyrolysis was designed, in which active metal iron was leached from ash and immobilized on the surface of residual carbon in the form of Fe-N-C. The unique structure of Fe-N doped carbon/ash synergistically improved the efficiency of electrocatalytic degradation of organic wastewater by 72.78 ± 1.37%. The hierarchical porous structure of residual carbon considerably enhanced the accessibility of ash catalytic sites. Abundant ash defects and Fe-N active sites promoted the conversion of free radical precursors to reactive oxygen species (ROS). The removal rate of various organic wastewater within 35 min reached more than 100 ± 1.83% %, with excellent electrocatalytic performance and pH adaptability. Fe-NCPE had a high specific surface area (318.36 m 2 ·g −1 ), orderly graphite phase (002 crystal surface size 1.3 nm), and abundant catalytic sites. We also proposed the catalytic mechanism by combining molecular simulation with experiments. The high adsorption capacity above 24.07 ± 0.12 mg·g −1 ensured the continuous and rapid supply of pollutants and H 2 O 2 near the catalytic site·H 2 O 2 was converted into ROS mainly composed of hydroxyl groups through the valence state change of aluminum or Fenton-like reaction of nitrogen-linked iron. The ROS then attacked organic molecules to degrade pollutants. The above two processes corresponded to two cyclic catalytic reactions. Therefore, this study provides an innovative and promising approach for comprehensive utilization of carbon and ash in GFS.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Jinli Zhao,Haotian Wang,Mengwei Yang,Fan Hong,Qingbai Chen,Luyao Ren,Yuzhong Zhang,Jianyou Wang
Developing an inexpensive green method for preparing membranes is crucial to reduce the cost of electrodialysis (ED). Introducing cationic functional groups into the main polymer chain of anion-exchange membranes (AEMs) is a common approach for modifying AEM materials, despite involving complex chemical processes. This study employs various cationic surfactants as functional materials, PVP as a hydrophilic agent, and polyether sulfone as the skeleton material to prepare AEMs using a simple procedure. The evaluated cationic surfactants have identical quaternary ammonium groups but different lengths of hydrophobic alkyl chains. The internal structures of the resulting AEMs are regulated by the compounding effects between the PVP and surfactants with distinct alkyl chains. The prepared AEMs were integrated into an ED system to evaluate their performance in the (i) desalination of brackish water, (ii) desalination of salt solutions containing organic matter, and (iii) removal of phenol from phenolic solutions. All AEMs exhibited good membrane-forming properties, although that prepared with hexadecyltrimethylammonium chloride as the functional material achieved the best overall performance. Overall, this report describes a simple and green method for preparing AEMs that can efficiently separate salts from organic solutions.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Xiaolei Chen,Zhongsen Yan,Haiqing Chang,Qiankun Wang,Gongduan Fan,Jinghan Ye,Kaiqin Xu,Heng Liang,Fangshu Qu
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.
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
危险品化学品经营许可证（带存储）