Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel  

作　　者：ZHANG Li-sheng WU Wei-zhong WANG Jian-long 

机构地区：[1]Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China [2]College of Environmental Sciences, Peking University, Beijing 100871, China

出　　处：《Journal of Environmental Sciences》2007年第11期1293-1297,共5页环境科学学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.50327802,50325824,50678089).

摘　　要：The microbial immobilization method using polyvinyl alcohol （PVA） gel as an immobilizing material was improved and used for entrapment of activated sludge. The oxygen uptake rate （OUR） was used to characterize the biological activity of immobilized activated sludge. Three kinds of PVA-immobilized particles of activated sludge, that is, PVA-boric acid beads, PVA-sodium nitrate beads and PVA-orthophosphate beads were prepared, and their biological activity was compared by measuring the OUR value. The bioactivity of both autotrophic and heterotrophic microorganisms of activated sludge was determined using different synthetic wastewater media （containing 250 mg/L COD and 25 mg/L NH4^＋ -N）. The experimental results showed that the bioactivity and stability of the three kinds of immobilized activated sludge was greatly improved after activation. With respect of the bioactivity and the mechanical stability, the PVA-orthophosphate method may be a promising and economical technique for microbial immobilization.The microbial immobilization method using polyvinyl alcohol （PVA） gel as an immobilizing material was improved and used for entrapment of activated sludge. The oxygen uptake rate （OUR） was used to characterize the biological activity of immobilized activated sludge. Three kinds of PVA-immobilized particles of activated sludge, that is, PVA-boric acid beads, PVA-sodium nitrate beads and PVA-orthophosphate beads were prepared, and their biological activity was compared by measuring the OUR value. The bioactivity of both autotrophic and heterotrophic microorganisms of activated sludge was determined using different synthetic wastewater media （containing 250 mg/L COD and 25 mg/L NH4^＋ -N）. The experimental results showed that the bioactivity and stability of the three kinds of immobilized activated sludge was greatly improved after activation. With respect of the bioactivity and the mechanical stability, the PVA-orthophosphate method may be a promising and economical technique for microbial immobilization.

关 键 词：IMMOBILIZATION biological activity oxygen uptake rate （OUR） polyvinyl alcohol （PVA） 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]