KMnO4-PAC对高原喀斯特湖库DOM的DBPsFP控制  

Control on disinfection by-products formation potential（DBPsFP） of DOM in karst plateau reservoir water by KMnO4-PAC

作　　者：王志康 周业[1,2] 葛秋诗 罗小勇 桂昕 兰彬彬 周慧 WANG Zhi-kang;ZHOU Ye;GE Qiu-shi;LUO Xiao-yong;GUI Xin;LAN Bin-bin;ZHOU Hui(College of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China;Institute of Drinking Water Safety,Guizhou Minzu University,Guiyang 550025,China;Guiyang Station of National Water Quality Monitoring System for Urban Water Supply,Guiyang 550000,China)

机构地区：[1]贵州民族大学生态环境工程学院,贵州贵阳550025 [2]贵州民族大学饮用水安全研究中心,贵州贵阳550025 [3]国家城市供水水质监测网贵阳监测站,贵州贵阳550000

出　　处：《中国环境科学》2019年第12期5085-5093,共9页China Environmental Science

基　　金：国家自然科学基金项目(41867048);贵州省科技厅基础研究项目(黔科合基础[2016]1071)

摘　　要：以云贵高原典型喀斯特湖库红枫湖取水口溶解性有机质(DOM)为研究对象,调查不同组合方式下高锰酸钾-聚合氯化铝(KMnO4-PAC)对消毒副产物的生成潜能(DBPsFP)变化和平均组成分布,并通过红外光谱(FTIR)和三维荧光光谱(3D-EEM)对部分样品进行化学表征,推断其影响机制.结果表明在0.1,0.2,0.4mg/L KMnO4投加量下,DBPsFP降低17.5~73%,DOM的卤代活性化学结构和官能团部分被有效钝化;PAC的网捕和卷扫效应使DBPsFP进一步减少27.9~86.1%,组合工艺对DBPs的生成潜能影响大小为:三卤甲烷(THM4)>卤乙酸(HAA9)>卤乙腈(HAN4)/卤代酮(HK2)/三氯硝基甲烷(TCNM).FTIR的结果表明预氧化后3300cm^-1处的透过率降低,指纹区1000~1300cm^-1处的峰频提升,表明分子中的O-H、COOH和C-O官能团增加,共轭不饱和结构在KMnO4作用下部分消失.3D-EEM验证了外源有机物(腐殖酸)在DOM中占比随KMnO4浓度梯度升高而下降,同时类蛋白结构的吸收峰强度增加,说明最终DBPs贡献可能源于DOM中剩余的小分子类蛋白(氨基酸).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(3 D-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 0.4 mg/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(1000~1300 cm^-1 and the decrease of transmittance of main peak at 3300 cm^-1,which was mainly attributed to accumulation of hydroxyl/carboxyl/C-O groups and the cleavage of conjugated carbon bonds.Results from 3 D-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.

关 键 词：溶解性有机质 消毒副产物 高原喀斯特湖库 预氧化-混凝 化学表征 

分 类 号：X524[环境科学与工程—环境工程]