分散生活污水一体化处理工艺试验研究

The Experimental Investigation on the Treatment Process of Decentralized Domestic Sewage

针对分散生活污水低浓度难处理的问题,进行了固定床接触氧化(FAST),周期循环式生物膜(CASBS)和缺氧/好氧-膜生物反应器(AO-MBR)三种工艺处理校园生活污水的试验研究。研究表明:FAST、CASBS和AO-MBR工艺对COD的去除率分别为79.3%、84.9%和90.9%,对NH3-N去除率分别为85.5%、91.2%和95.8%,FAST工艺处理成本较低,吨水处理成本仅有0.68元,CASBS工艺脱氮除磷效果占优,对TN和TP的去除率为51.8%和76.7%,AO-MBR工艺对浊度和SS去除效果明显,其出水含量分别为0.21NTU和1.95mg/L。三种工艺出水水质均稳定,COD、NH3-N、SS和浊度等指标均达到城市杂用水水质标准。

In order to solve the difficulty in treating low-strength domestic wastewater （CODcr〈200 mg/L） by the traditional activated sludge, the fixed activated sludge treatment（FAST）, cyclic activated sludge bio-media system（CASBS） and the anoxic-aerobie membrane bioreactor （AO-MBR） were used to treat the campus domestic wastewater individually. The results showed the FAST process could remove 79.3 % of COD and 85.5 % of NH3-N, the CASBS process could remove 84.9 % of COD and 91.2 % of NH3-N, and the AO-MBR process could remove 90.9 % of COD and 95.8 % of NH3-N. The effects of nitrogen and phosphorus removal were significantly better by the CASBS process, for 51.8 % of TN and 76.7 % of TP could be removed. The turbidity and SS were 0.21 NTU and 1.95 mg/L in the effluent of AO-MBR process. The FAST process treating 1 t wastewater only costs 0.68 yuan which was least. The effluent quality after three processes treated were all stable and excellent, and each can be used as municipal miscellaneous water individully.