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以取自河南省郑州市石佛原水厂的黄河原水为研究对象,系统研究了原水中消毒副产物(DBPs)前体物的组成规律,对比分析了3种预氧化剂(高锰酸钾、自由氯和二氧化氯)对原水中DBPs生成潜能的消减规律.试验结果表明:原水中DBPs的前体物均以小分子有机物和疏水性组分(52.51%)为主;分子量小于1 k Da有机物组分是生成含氮消毒副产物(N-DBPs)和三卤甲烷(THMs)的主要前体物;疏水性有机物是生成THMs的主要前体物,亲水性有机物是生成N-DBPs的主要前体物.经Cl2预氧化后,直接生成的DBPs随着自由氯投加量的增加而增加,Cl O2和KMn O4预氧化直接增加DBPs产生量.经3种预氧化剂氧化后,原水中三卤甲烷生成潜能(THMFP)均呈现一定的下降,其降低量依次为Cl O2>Cl2>KMn O4;然而3种预氧化剂都不能有效的减少含氮消毒副产物生成潜能(N-DBPFP),Cl O2预氧化和Cl2预氧化可增加N-DBPs生成潜能,尤其在较高投加量下,Cl2预氧化将大大增加N-DBPs生成潜能.为有效消减总DBPs生成潜能,水厂可优先采用KMn O4或Cl O2作为预氧化剂处理引黄水库或沉砂池水.
Taking the Yellow River raw water collected from Shifangyuan Water Plant in Zhengzhou City of Henan Province as the research object, the composition rules of the precursors of disinfection byproducts (DBPs) in raw water were systematically studied. The effects of three preoxidants (potassium permanganate, Chlorine and chlorine dioxide) on the production potential of DBPs in raw water.The experimental results show that the precursors of DBPs in raw water are mainly composed of small organic molecules and hydrophobic components (52.51%), and those with molecular weights less than 1 kDa The components are the main precursors to nitrogen-containing disinfection byproducts (N-DBPs) and trihalomethanes (THMs). Hydrophobic organic compounds are the main precursors to THMs. Hydrophilic organic compounds are the main precursors to N-DBPs The precursors.The pre-oxidation of Cl2, the direct generation of DBPs with free chlorine dosage increases, pre-oxidation ClO2 and KMn O4 directly increase the amount of DBPs produced by the three pre-oxidants oxidation, However, all three pre-oxidants did not reduce N-DBPFP, Cl (ClP> Cl2> KMnO4), Cl O2 pre-oxidation and Cl2 pre-oxidation increase the potential for N-DBPs production, especially at high levels Lower dosage, Cl2 preoxidation will greatly increase the potential for generating N-DBPs. Potential for generating an effective reduction of the total DBPs, water may preferably have KMn O4 Cl O2 or as a pre-treatment oxidant Yellow sand reservoirs or water.