Chu Wenhai, Yao Dechang, Gao Naiyun, Bond Tom, Templeton Michael R
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Research & Service Center for Environmental Industry, Yancheng 224051, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Chemosphere. 2015 Dec;141:1-6. doi: 10.1016/j.chemosphere.2015.05.087. Epub 2015 Jun 8.
Pilot-scale tests were performed to reduce the formation of a range of carbonaceous and nitrogenous disinfection by-products (C-, N-DBPs), by removing or transforming their precursors, with an integrated permanganate oxidation and powdered activated carbon adsorption (PM-PAC) treatment process before conventional water treatment processes (coagulation-sedimentation-filtration, abbreviated as CPs). Compared with the CPs, PM-PAC significantly enhanced the removal of DOC, DON, NH3(+)-N, and algae from 52.9%, 31.6%, 71.3%, and 83.6% to 69.5%, 61.3%, 92.5%, and 97.5%, respectively. PM pre-oxidation alone and PAC pre-adsorption alone did not substantially reduce the formation of dichloroacetonitrile, trichloroacetonitrile, N-nitrosodimethylamine and dichloroacetamide. However, the PM-PAC integrated process significantly reduced the formation of both C-DBPs and N-DBPs by 60-90% for six C-DBPs and 64-93% for six N-DBPs, because PM oxidation chemically altered the molecular structures of nitrogenous organic compounds and increased the adsorption capacity of the DBP precursors, thus highlighting a synergistic effect of PM and PAC. PM-PAC integrated process is a promising drinking water technology for the reduction of a broad spectrum of C-DBPs and N-DBPs.
进行了中试规模的试验，通过去除或转化其前体物质，采用高锰酸钾氧化与粉末活性炭吸附（PM-PAC）集成处理工艺，在常规水处理工艺（混凝-沉淀-过滤，简称为CPs）之前，减少一系列碳质和含氮消毒副产物（C-、N-DBPs）的形成。与CPs相比，PM-PAC显著提高了对溶解性有机碳（DOC）、溶解性有机氮（DON）、氨氮（NH₃⁺-N）和藻类的去除率，分别从52.9%、31.6%、71.3%和83.6%提高到69.5%、61.3%、92.5%和97.5%。单独的PM预氧化和单独的PAC预吸附并不能显著减少二氯乙腈、三氯乙腈、N-亚硝基二甲胺和二氯乙酰胺的形成。然而，PM-PAC集成工艺显著减少了C-DBPs和N-DBPs的形成，六种C-DBPs减少了60-90%，六种N-DBPs减少了64-93%，因为PM氧化化学改变了含氮有机化合物的分子结构，提高了DBP前体的吸附能力，从而突出了PM和PAC的协同效应。PM-PAC集成工艺是一种很有前景的饮用水处理技术，可减少多种C-DBPs和N-DBPs。
