摘要
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.
Raw water from Yellow River in Henan Province was collected for investigation of different disinfection by-products（ DBPs） precursors. The comparisons were conducted for DBPs formation by three different pre-oxidation processes. It was found that the DBP precursors were mainly constituted of small organic molecules and hydrophobic organic matter（ 52. 51%）. The organic compounds with molecular weight 〈1 k Da were the main nitrogenous disinfection by-products（ N-DBPs） precursors and trihalomethanes（ THMs） precursors. Hydrophobic organic matter was the maximum THMs precursor while hydrophilic organic matter was the maximum N-DBPs precursor. For pre-oxidation of Cl2,the formation of DBPs increased significantly as the Cl2 concentration increasing. The trihalomethane formation potential declined during three pre-oxidation processes and the decrease followed the order of C O2〉Cl2KMn O4. However,no obvious phenomena were observed for all the three pre-oxidants on nitrogenous disinfection byproducts formation. Overall,ClO2 is the best alternative pre-oxidant to control DBPs formation in Yellow River raw water.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第3期827-833,共7页
Acta Scientiae Circumstantiae
基金
国家水体污染控制与治理科技重大专项(No.2012ZX07404-004)~~
关键词
黄河原水
消毒副产物
生成潜能
化学预处理
水处理
Yellow River raw water
disinfection by-products（DBPs）
formation potential
chemical pretreatment
water treatment
