Control on disinfection by-products formation potential (DBPsFP) of DOM in karst plateau reservoir water by KMnO4-PAC
WANG Zhi-kang1,2, ZHOU Ye1,2, GE Qiu-shi1,2, LUO Xiao-yong3, GUI Xin1, LAN Bin-bin1,2, ZHOU Hui1,2
1. College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang 550025, China;
2. Institute of Drinking Water Safety, Guizhou Minzu University, Guiyang 550025, China;
3. Guiyang Station of National Water Quality Monitoring System for Urban Water Supply, Guiyang 550000, China
The influence of KMnO4 peroxidation combined with PAC (poly aluminum chloride) coagulation (KMnO4-PAC) on controlling disinfection byproducts formation potential (DBPsFP) and speciation variation in a representative Karst plateau reservoir (Hongfeng Lake) was investigated. Fourier transform infrared spectroscopy (FTIR) and three-dimensional fluorescence spectrum (3D-EEM) were applied to conjecture DBP formation pathways. Results indicated that, DBPsFP decreased by 17.5% to 73% under the dosage of 0.1,0.2 and 0.4mg/L KMnO4 compared to untreated water,which might be attributed to the partial deactivation of halogen-active chemical structures and functional groups. In addition, the capture and sweep effect of PAC can further decrease DBPsFP by 27.9% to 86.1% compared to pre-oxidized DOM. The impact of KMnO4-PAC on DBPsFP was in the order of:trihalomethanes (THM4)>haloacetic acids (HAA9)>haloacetonitriles (HAN4)/haloketones (HK2)/trichloronitromethane (TCNM). FTIR results showed the increase of peak frequency in fingerprint zone (1000~1300cm-1) and the decrease of transmittance of main peak at 3300cm-1, which was mainly attributed to accumulation of hydroxyl/carboxyl/C-O groups and the cleavage of conjugated carbon bonds. Results from 3D-EEM analysis indicated that allochthonous organic matter (humic acid like substances) were reduced as the increase of KMnO4 dosage. Simultaneously, the peak intensity of protein-like substances increased, which implied that DBPsFP were possibly resulted from protein (amino acid) in untreated DOM.
王志康, 周业, 葛秋诗, 罗小勇, 桂昕, 兰彬彬, 周慧. KMnO4-PAC对高原喀斯特湖库DOM的DBPsFP控制[J]. 中国环境科学, 2019, 39(12): 5085-5093.
WANG Zhi-kang, ZHOU Ye, GE Qiu-shi, LUO Xiao-yong, GUI Xin, LAN Bin-bin, ZHOU Hui. Control on disinfection by-products formation potential (DBPsFP) of DOM in karst plateau reservoir water by KMnO4-PAC. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5085-5093.
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