污水再生过程中消毒副产物前体物转化规律

Transformation of Disinfection Byproduct Precursors During the Wastewater Regeneration Processes

采用大孔吸附树脂将污水中的消毒副产物(DBP)前体物分离为亲水性物质(HPI)、强疏水性物质(HPO)和弱疏水性物质(TPI)这3个组分,通过三维荧光光谱、傅里叶红外光谱和核磁共振对再生水处理各沿程前体物进行表征,并测定各沿程出水的消毒副产物生成势(DBPFP).结果表明,生活污水中DBPs前体物主要组分为腐殖质和脂肪烃,以HPI为主.一级处理(沉淀)基于HPO与水互斥的物理性能对疏水性腐殖质有较好的去除效果,腐殖质的去除会导致含碳消毒副产物生成势(CDBPFP)的降低.此外由于DON/DOC的增加,含氮消毒副产物生成势(N-DBPFP)有所增加.二级处理(生物处理)对腐殖质和脂类均有较好的去除效果,但会产生大量疏水性的溶解性微生物产物(SMP),因此生物处理后DBPs前体物主要表现为疏水性.SMP的累积会导致C-DBPFP和N-DBPFP的大幅增加.深度处理(滤布滤池)能截留部分腐殖质和疏水性的SMP,因此前体物HPO占比减少,HPI占比增加.深度处理可以通过对SMP的去除来降低C-DBPFP和N-DBPFP.

Disinfection byproduct（DBP） precursors during the wastewater regeneration processes were separated into hydrophilic fraction（HPI）, hydrophobic fraction（HPO） and transphilic fraction（TPI） with macroporous resin. DBP precursors in these water samples were characterized with fluorescence excitation emission matrix, Fourier transformation infrared and nuclear magnetic resonance, and were further tested for their DBP formation potential（DBPFP） after chlorination. The results indicated that main DBP precursors in sewage were humic acid and aliphatic hydrocarbons, and were mainly dominated by HPI. Primary treatment（sedimentation） could effectively remove hydrophobic humic acid through the mutual exclusion between HPO and water. The removal of humic acid would lead to the obvious reduction of carbonaceous disinfection byproduct formation potential（C-DBPFP）. In addition, nitrogenous disinfection byproduct formation potential（N-DBPFP） was found to be increased due to the increase of DON/DOC value. Although secondary treatment（biotreatment） was effective in removing humic acid and aliphatic hydrocarbons, it could produce a large amount of soluble microbial products（SMP）, which led to the enhancement of HPO percentage. And the accumulation of SMP resulted in the significant increase of C-DBPFP and N-DBPFP. Humic acid and hydrophobic SMP could be removed by the advanced treatment（cloth filtration）, leading to the reduction of HPO percentage and the increase of HPI percentage. The decrease of humic acid and hydrophobic SMP would cause the reduction of C-DBPFP and N-DBPFP in the advanced treatment.