[Effect of chlorination on the structure of dissolved organic matters in secondary effluent].
Dissolved organic matter in the secondary effluent from the W wastewater treatment plant (Harbin) was fractionated using XAD resins into five fractions: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). The distribution, trihalomethane formation potential (THMFP), UV-Vis and FTIR spectra of organic fractions in the secondary effluent were examined. XAD fractionation results showed that HPO-A and HPI dominated in the secondary effluent, collectively accounting for about 70.8%. HPO-A was the main precursors for THMFP following chlorination. HPO-A had the highest specific THMFP (STHMFP) and averaged 232.9 microg/mg. The STHMFP of HPO-N, TPI-A, TPI-N and HPI ranged from 100 microg/mg to 125 microg/mg. Chlorination resulted in increased UV-Vis absorbance for TPI-N and decreased UV-Vis absorbance for HPO-A, HPO-N, TPI-A and HPI. After chlorination, O--H, C=C and aromatic ring were found to decrease while C--O was observed to increase for HPO-A, HPO-N, TPI-A and TPI-N. In addition,C=O and C--Cl were found to occur as by-products from the chlorination reaction.
Xue
Shuang
S
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. xueshuang666@sina.com.cn
Zhao
Qing-liang
QL
Wei
Liang-liang
LL
D002713:Chlorine / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D054879:Halogenation; D022882:Trihalomethanes / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; D002713:Chlorine