摘要
为探讨水力停留时间(HRT)对厌氧反应器与好氧MBR组合工艺处理效果的影响,以印染废水为研究对象,进行了实验室研究。结果表明,在溶解氧(DO)浓度为1．8-2．6 mg／L的条件下,HRT为7．5、4．5和2．5 h时,反应器对 COD的去除效率分别为88．7％-96．5％、87．3％-97．2％和81％-92％,出水COD的浓度分别为78．9-51．2、81．6-50．8、93．4- 65．8 mg／L。试验同时考察了不同HRT条件下,活性污泥浓度(MLSS)对COD去除率的影响。结果表明,在试验条件下, 本工艺中一体化膜生物反应器中最佳污泥浓度应控制在6 500 mg／L左右。
In order to investigate the influence of hydraulic retention time （HRT） on the organic pollutants removal in the combined process of an anaerobic reactor and a membrane bioreactor （MBR）, a lab-scale experiment was conducted using printing and dyeing wastewater as influent. The dissolved oxygen （DO） concentration was controlled at 1.8-2.6 mg/L during all the experiment period. The experimental results demonstrated that when HRT was at 7.5,4.5 and 2.5h, the removal rates of COD were 88.7%-96.5%, 83%-97.2% and 81%-92%, and the effluent COD were 78.9-51.2, 81.6-50, 93.4-65.8 mg/L, respectively. In addition, the effect of activated sludge concentration （MISS） on COD removal was also investigated. It was showed that the optimum MLSS was better controlled at around 6 500 mg/L in this process.
