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按照UFC方法对水体中3种常见细菌Acinetobacter junii、Staphylococcussciuri和Escherichia coli进行纯细菌加氯消毒处理,同时考察水中溴离子对纯细菌物质生成DBPs的影响.结果表明,3种细菌均为DBPs前体物,加氯消毒生成的DBPs除水合三氯乙醛(CHD)外,生成的三卤甲烷(THMs)物质主要为氯仿(TCM),卤乙腈(HANs)物质主要为二氯乙腈(DCAN).氯仿的生成量与细菌物质TOC浓度无明显关系,但HANs和CHD生成量均随细菌TOC浓度增大而增加.其中革兰氏阳性细菌Staphylococcus sciuri生成的DCAN和CHD比革兰氏阴性细菌Acinetobacter junii和Escherichia coli生成的要高,说明细胞壁的化学组分可能是DCAN和CHD生成的影响因素之一.Escherichia coli细菌反应液中溴离子(Br-)存在时,除生成CHD、TCM及DCAN外,THMs和HANs中的溴代种类CHBr3随Br-增多而持续增加,相反TCM持续减少.当Br-浓度为4mg.L-1时,TBM浓度增至最高127.9μg.L-1;HANs和CHD生成量随Br-浓度增加先有所增加,随后持续降低至低于检测限;Br离子存在时THMs为主要DBPs种类.
According to the UFC method, three kinds of common bacteria Acinetobacter junii, Staphylococcussciuri and Escherichia coli were disinfected with pure bacteria in chlorinated water, meanwhile, the effect of bromine ions in water on the formation of DBPs by pure bacteria was also studied.The results showed that all three kinds of bacteria were DBPs precursors The DBPs produced by chlorination were all chloroform (TCM) except for hydrated trichloroacetaldehyde (CHD), and the main substances of haloacetonitrile (HANs) were dichloroacetonitrile (DCAN). However, the amount of HANs and CHD increased with the increasing of TOC concentration of bacteria, while the production of DCAN and CHD by Gram-positive bacteria Staphylococcus sciuri was higher than that of Gram-negative bacteria Acinetobacter junii And Escherichia coli generated higher, indicating that the chemical composition of the cell wall may be DCAN and CHD generation of one of the factors.Escherichia coli bacterial reaction broth (Br-) in the presence, in addition to the formation of CHD, TCM and DCAN, Bromine species CHBr3 in THMs and HANs continued to increase with Br-increase, while TCM continued to decrease.When Br-concentration was 4 mg.L-1, TBM concentration increased to 127.9 μg.L-1, HANs and CHD The amount of Br- Increase of the first increase, and then continuously reduced to below the detection limit; Br ions when mainly THMs DBPs species.