title: Dissolved organic matter removal using magnetic anion exchange resin treatment on biological effluent of textile dyeing wastewater.
abstract: This study investigated the removal of dissolved organic matter (DOM) from real dyeing bio-treatment effluents (DBEs) with the use of a novel magnetic anion exchange resin (NDMP). DOMs in two typical DBEs were fractionized using DAX-8/XAD-4 resin and ultrafiltration membranes. The hydrophilic fractions and the low molecular weight (MW) (<3kDa) DOM fractions constituted a major portion (>50%) of DOMs for the two effluents. The hydrophilic and low MW fractions of both effluents were the greatest contributors of specific UV254 absorbance (SUVA254), and the SUVA254 of DOM fractions decreased with hydrophobicity and MW. Two DBEs exhibited acute and chronic biotoxicities. Both acute and chronic toxicities of DOM fractions increased linearly with the increase of SUVA254 value. Kinetics of dissolved organic carbon (DOC) removal via NDMP treatment was performed by comparing it with that of particle active carbon (PAC). Results indicated that the removal of DOC from DBEs via NDMP was 60%, whereas DOC removals by PAC were lower than 15%. Acidic organics could be significantly removed with the use of NDMP. DOM with large MW in DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Compared with PAC, NDMP could significantly reduce the acute and chronic bio-toxicities of DBEs. NaCl/NaOH mixture regenerants, with selected concentrations of 10% NaCl (m/m)/1% NaOH (m/m), could improve desorption efficiency.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing 210023, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing 210023, China.
authors.forename: Haibo
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: shuangchendong@nju.edu.cn.
authors.forename: Chendong
authors.initials: C
authors.lastname: Shuang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing 210023, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing 210023, China. Electronic address: liaimin@nju.edu.cn.
authors.forename: Aimin
authors.initials: A
authors.lastname: Li
mesh_terms: D000837:Anion Exchange Resins / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D059346:Magnets; D013050:Spectrometry, Fluorescence; D013783:Textile Industry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000837:Anion Exchange Resins; D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical
keywords: Advanced treatment; Anion exchange; Magnetic resin; Secondary/biological effluent; Textile dyeing