采用臭氧作为剩余污泥的细胞裂解剂,并与淹没式生物膜工艺相结合进行污泥减量的实验研究,臭氧化后的污泥上清液回流入曝气池与污水合并处理。结果表明:在每kgMLSS臭氧投量为0.05 kg,臭氧化污泥体积流量为进水量的5%条件下,淹没式生物膜系统对SCOD和NH3-N的平均去除率分别为87.06%和84.80%,出水水质同对比实验相当;同时获得了去除1 g SCOD得到0.054 gMLSS的剩余污泥产率,与对比实验相比降低了78.4%。
In this study, the effect of zeolite powder addition on submerged memb rane bioreactor(SMBR) on membrane permeability, and the removals for COD, NH3-N, TN were investigated. Through the parallel operation of control and test system s, it was found that the zeolite powder addition could alleviate the ultra-filtr ation membrane fouling and enhance the membrane permeability. On the basis of ex perimental investigations, a concept of “protection coating layer” was propose d to illustrate the phenomenon of UF membrane fouling. In addition, the removal for COD in test system was more stable, a little higher compared to the control system. Due to the combination of nitrification and ion exchange, a more excelle nt removal for NH3-N in test system was obtained regardless of influent NH3-N lo ading rate. It was also found that a mean 25% higher TN removal took place in th e test system, and ion exchange and simultaneous nitrification and de-nitrificat ion were analyzed to be main factors. During the stable operation period, the SO URs of test zeolite powder added sludge and control activated sludge were measur ed to be 75 mgO2/(gMLVSS·h) and 24 mgO2/(gMLVSS·h) res- pectively, it meant th at the zeolite powder addition could enhance the microorganism activity signific antly.
