Dissolved organic matter removal using magnetic anion exchange resin treatment on biological effluent of textile dyeing wastewater
Jun Fan , Haibo Li , Chendong Shuang
,
Wentao Li
,
Aimin Li
DOI:10.1016/j.jes.2014.05.024
Received October 19, 2013,Revised December 31, 2013, Accepted , Available online August 28, 2014
Volume 26,2014,Pages 1567-1574
This study investigated the removal of dissolved organic matter (DOM) from real dyeing bio-treatment effluents (DBEs) with the use of a novelmagnetic 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) (<3 kDa) DOM fractions constituted amajor portion (>50%) ofDOMs for the two effluents. The hydrophilic and low MWfractions 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 viaNDMP treatment was performed by comparing itwith 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 MWin DBE could be removed significantly by using the same means. Removal efficiency of NDMP for DOM decreased with the decrease of MW. Comparedwith 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.
