Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
Bioresour Technol. 2014 Aug;166:381-8. doi: 10.1016/j.biortech.2014.05.082. Epub 2014 May 28.
In this study, real municipal wastewater intended for reuse was treated by two identical hybrid PAC/MBRs (membrane bioreactors with powdered activated carbon addition), which were operated at sludge retention times (SRTs) of 30 and 180 days, respectively. In order to investigate the effects of SRT on trihalomethane (THM) formation in chlorinated PAC/MBR effluents, characteristics and THM formation reactivity of effluent dissolved organic matter (EfOM) at different SRTs were examined. PAC/MBR-180 had higher level of EfOM, which contained less simple aromatic proteins and exhibited lower specific UV absorbance. EfOM with molecular weight <5 kDa from PAC/MBR-30 (23%) was lower than PAC/MBR-180 (26%). About 50% of EfOM from PAC/MBR-30 was hydrophobic acids, which was higher than that from PAC/MBR-180 (about 36%). EfOM at SRT 180 days exhibited higher hydrophilicity. Prolonging SRT greatly reduced THM formation reactivity of EfOM, but increased the formation of bromine-containing species during chlorination of PAC/MBR effluents.
在这项研究中，采用了两种相同的混合 PAC/MBR（粉末活性炭添加式膜生物反应器）对实际的城市废水进行处理，分别以污泥停留时间（SRT）为 30 天和 180 天运行。为了研究 SRT 对氯化 PAC/MBR 出水中三卤甲烷（THM）形成的影响，考察了不同 SRT 下出水中溶解性有机物（EfOM）的特性和 THM 形成反应性。PAC/MBR-180 具有更高水平的 EfOM，其中含有较少的简单芳香族蛋白质，且表现出较低的特定紫外吸光度。来自 PAC/MBR-30（23%）的分子量<5 kDa 的 EfOM 低于 PAC/MBR-180（26%）。来自 PAC/MBR-30 的约 50%的 EfOM 为疏水性酸，高于 PAC/MBR-180（约 36%）。SRT 为 180 天时的 EfOM 表现出更高的亲水性。延长 SRT 会大大降低 EfOM 的 THM 形成反应性，但会增加 PAC/MBR 出水中氯化时含溴物种的形成。
