SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Lijun Meng,Minjie Wu,Haisheng Chen,Yu Xi,Manhong Huang,Xubiao Luo
Wastewater containing heavy metal antimony (Sb) from textile and printing industry has high potential toxicity to environment and human health. In this study, forward osmosis (FO) technology was firstly used to remove Sb from both model Sb wastewater and real dyeing and printing wastewater. The evaluation of FO performance with different feed solution pH and NaCl concentration indicated that the water flux and reverse salt flux were proportional to both the feed solution pH and NaCl concentration. The rejection of Sb decreased with NaCl concentration while increased with feed solution pH. The addition of Cr (VI) as co-existing ions in the feed further increased Sb removal for a range of feed solution pH and NaCl concentration. FO process exhibited high removal efficiency for Sb (>99.7%) and other water quality parameters (TN, TP, NH 3 -N, SS, COD and TOC) when it was applied for the treatment of real dyeing and printing wastewater. The mass balance of Sb in FO process was also analyzed to investigate the membrane fouling and rejection mechanism.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 2
·690-702
·
IF 2.578
Xiuzhen Wei,Shiyu Cao,Jiayao Hu,Yi Chen,Ruiyuan Yang,Jiahao Huang,Ze Wang,Qinghua Zhou,Jinyuan Chen
Graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) modified nanofiltration (NF) membranes were successfully fabricated by interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC). Compared with the pristine polyamide (PA) membrane and GO membrane, the typical structure of the granular protrusions on the surface of the GO/MWCNTs membrane gradually disappeared, and a regular ordered morphology appeared. The membrane thickness and surface roughness were increased according to the results of field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). The contact angle of GO/MWCNTs NF membranes progressively decreased from 57° to 23°, indicating the enhancement of surface hydrophilicity. The best NF performance was achieved when the ratio of GO to MWCNTs was 6:3 (G-M-3). The water flux was 55.6 L/m 2 .h, which was 33.7% higher than that of the GO membrane, and the rejection rate for Na 2 SO 4 was maintained at approximately 94%. Both modified NF membranes could treat actual dyeing-printing wastewater effectively. The anti-fouling performance of G-M-3 was better than that of G3. Therefore, GO/MWCNTs-modified NF membranes have a good application prospects in the field of wastewater treatment and water purification.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Chen Yunlu,Cheng Yunqin,Guan Xiaohong,Liu Yan,Nie Jianxin,Li Chenxi
A rapid Fenton treatment at second-scale intervals was investigated for further removal of organic compounds in the effluent of bio-treated dyeing and finishing wastewater (BDFW). The decolorization kinetics was studied using a stopped-flow spectrophotometer (SFS) at second-scale intervals. A combined first-order model was found to fit well for the decrease of both methylene blue and rhodamine B in SFS as well as SCOD (soluble chemical oxygen demand) and DOC (dissolved organic carbon) in real BDFW in batch test during Fenton oxidation. A full-scale plant with treatment capacity of 400,000 m 3 ·d −1 was designed and has been run continuously based on the results of the stopped-flow study to treat the effluent of BDFW using Fenton oxidation in 16 pipeline reactors, each with a volume of 6.9 m 3 and 24 s of reaction time since 2014. The COD, SCOD and DOC decreased from 140, 110 and 35 mg·L −1 to 77, 71 and 26 mg·L −1 respectively, which can meet the latest strict discharge limitations. The natural fluorescent substances detected in the BDFW were completely removed. The main organic pollutants in the BDFW can be significantly reduced using both gas chromatography-mass spectrometry and ultrahigh-performance liquid chromatography-hybrid quadrupole time-of-flight mass spectrometry. The rapid Fenton reaction applied in pipeline reactors at second intervals has several advantages over the conventional Fenton’s process such as much shorter reaction time at second scale intervals, no need to build extra pH adjustment or reaction tanks, simple operation, low capital cost, etc.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2016
·
IF 5.991
Jin Wu,Luming Ma,Yunlu Chen,Yunqin Cheng,Yan Liu,Xiaosong Zha
Catalytic ozonation of organic pollutants from actual bio-treated dyeing and finishing wastewater (BDFW) with iron shavings was investigated. Catalytic ozonation effectively removed organic pollutants at initial pH values of 7.18–7.52, and the chemical oxygen demand (COD) level decreased from 142 to 70 mg·L −1 with a discharge limitation of 80 mg·L −1 . A total of 100% and 42% of the proteins and polysaccharides , respectively, were removed with a decrease in their contribution to the soluble COD from 76% to 41%. Among the 218 organic species detected by liquid chromatography-mass spectrometry, 58, 77, 79 and 4 species were completely removed, partially removed, increased and newly generated, respectively. Species including textile auxiliaries and dye intermediates were detected by gas chromatography-mass spectrometry. The inhibitory effect decreased from 51% to 33%, suggesting a reduction in the acute toxicity. The enhanced effect was due to hydroxyl radical ( OH) oxidation, co-precipitation and oxidation by other oxidants. The proteins were removed by OH oxidation (6%), by direct ozonation, co-precipitation and oxidation by other oxidants (94%). The corresponding values for polysaccharides were 21% and 21%, respectively. In addition, the iron shavings behaved well in successive runs. These results indicated that the process was favorable for engineering applications for removal of organic pollutants from BDFW.
研究领域:
环境科学
·
水处理
·
催化
·
废水管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nan Yao,Shifeng Ji,Yunqing Xing,Jinchao Chen,Yanrui Cheng,Xiaonan Ruan,Jiaxin Chen,Zhuo Li,Yingjie Zhang,Chunmei Gao,Changbing Ye
This study reports the development and performance of a chlorine-resistant, negatively charged loose nanofiltration (LNF) membrane designed for efficient dye/salt separation from textile wastewater. The membrane was constructed by incorporating a synergistic composite of zeolitic imidazolate framework-L (ZIF-L) and polydopamine (PDA) into a polyamide layer on a polyethersulfone (PES) support via interfacial polymerization. In this design, ZIF-L nanosheets create a highly permeable, loose network, while PDA acts as a crucial molecular linker to ensure homogeneous dispersion and structural integration. Characterization using SEM, XRD, FTIR, XPS, and AFM confirmed successful synthesis. The optimal membrane, loaded with 2 wt% ZIF-L/PDA, exhibited superior performance: a pure water flux of 31.56 L·m −2 ·h −1 ·bar −1 , which is 3.19 times greater than the pristine Thin-Film Composite (TFC) membrane. This membrane achieved high dye rejection rates: Eriochrome Black T (99.25 %), Acid Chrome Blue K (97.87 %), Direct Blue 71 (97.56 %), Congo Red (94.09 %), and Direct Red 23 (93.92 %). Simultaneously, it showed low rejection for salts, indicating high permeability: NaCl (7.80 %), MgCl 2 (9.89 %), MgSO 4 (15.39 %), and Na 2 SO 4 (23.97 %). Crucially, the membrane demonstrated robust stability under diverse and harsh conditions, including exposure to strong acid, strong alkali, high pressure, and during long-term continuous operation, along with markedly enhanced chlorine resistance. Therefore, the ZIF-L/PDA loose NF membrane presents significant potential for dye wastewater treatment applications.
研究领域:
环境工程
·
膜科学与技术
·
化学工程
·
纳米技术
·
水处理
·
材料科学
✓ 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）