SBR非丝状菌污泥膨胀模型的构建

Establishment of Model for Non-filamentous Sludge Bulking in Sequencing Batch Reactor

以序批式反应器(SBR)为试验系统,采用以乙酸钠、葡萄糖为基质的人工配水为进水,通过固定溶解氧浓度、不断调整进水C/N值和有机负荷,从污泥宏观及微观角度综合研究了C/N值对SBR系统的影响并成功构建了SBR非丝状菌污泥膨胀模型。结果发现:当进水C/N值为52、有机负荷为1.0～1.5 kg/(kg.d)、溶解氧为5～7 mg/L时即可快速引起非丝状菌污泥膨胀;此外,在构建的非丝状菌污泥膨胀模型中,活性污泥的沉降性能虽然变差、出水浑浊、透明度差,但仍具有高效去除COD和NH4+-N的能力,对二者的去除率仍能达到90%以上。

The synthetic wastewater with sodium acetate and glucose as substrate was used as influent of SBR. Through fixing concentration of DO and adjustment of C/N ratio and organic loading, the influence of C/N ratio on SBR was investigated from both macroscopic and microcosmic aspects. A model for non-filamentous sludge bulking in SBR was established. The results show that non-filamentous sludge bulking occurs when the influent C/N ratio is 52, organic loading is 1.0 to 1.5 kg/（ kg · d） , and DO is 5 to 7 mg/L. In the establishment of model for non-filamentous sludge bulking, although the settleability of activated sludge becomes poorer and the effluent is turbid with lower transparency, COD and NH4 - N are still effectively removed, and their removal rates are more than 90%.