厌氧反应器与好氧MBR组合工艺中HRT对有机物去除效果的影响

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.

Removal of Organic Pollutants at Different HRT in an Anaerobic Bioreactor and MBR

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 (MLSS) 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.