AAO-MBR工艺污水处理系统中消毒副产物前体物变化规律

为探究DBPs（消毒副产物）前体物在污水处理过程中的变化情况，采用超滤膜和XAD大孔吸附树脂将AAO-MBR工艺沿程出水中DOM（溶解性有机物）进行分离，并利用3D-EEM（三维荧光光谱）对分离前后水样进行表征，同时测定DBPFP（消毒副产物生成势）.结果表明:①沉砂池出水具有较低的C-DBPFP（含碳消毒副产物生成势）；经过AAO和MBR后，由于微生物代谢作用生成的疏水性SMPs（微生物代谢产物）类物质（为主要的C-DBPs前体物质）包含较多不饱和键，导致C-DBPFP增加.②沉砂池出水的N-DBPFP（含氮消毒副产物生成势）较低，但经过AAO后生成的小分子物质（为主要的N-DBPs前体物）导致N-DBPFP增加；经过MBR后由于SRT（污泥停留时间）和污泥浓度的增加造成小分子物质减少，致使N-DBPFP降低.③市政污水经过AAO后，C-DBPs和N-DBPs前体物分别增加了90.9%和7.3%；而MBR具有较高的DOC去除率（74.4%），去除了56.8%的C-DBPs前体物和78.1%的N-DBPs前体物.研究显示，AAO-MBR工艺对市政污水中C-DBPs和N-DBPs前体物有较好地去除效果. 

Variation of Disinfection By-Product Precursors during Anaerobic-Anoxic-Oxic-Membrane-Bioreactor (AAO-MBR) Process in the Sewage Treatment Plant

In order to investigate the change of disinfection by-product (DBP) precursors during the sewage treatment process, dissolved organic matter (DOM) of the effluents during the AAO-MBR process was separated with ultrafiltration membrane and XAD adsorption resin, then characterized with 3D-EEM spectra. The DBPFP of effluents and their separated fractions were further evaluated in this study. The results showed that C-DBPFP of the grit chamber effluent was low, the AAO and MBR processes could increase C-DBPFP significantly. SMPs produced by microbial metabolism during the AAO and MBR processes was the major C-DBP precursors. The grit chamber effluent also displayed low N-DBPFP. The AAO process led to the increase in N-DBPFP mainly due to the production of small molecule SMPs. The MBR process could result in the decrease in N-DBPFP comparing to the AAO process, by reducing small molecule SMPs with long SRT and high sludge concentration. In all, the AAO process would obviously enhance C-DBP and N-DBP precursors by 90.9% and 7.3%, respectively. However, the MBR process could remove 74.4% DOC, resulting in 56.8% C-DBP precursor and 78.1% N-DBP precursor removal. Therefore, AAO-MBR had a respectable removal effect on C and N-DBPs precursors in the municipal sewage.