Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel.
Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel.
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DOI：
10.1016/s1001-0742(07)60211-3
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发表时间：
2007
影响因子：
6.9
通讯作者：
Li-Sheng Zhang;Wei-zhong Wu;Jian-long Wang
中科院分区：
文献类型：
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作者：
Li-Sheng Zhang;Wei-zhong Wu;Jian-long Wang
对以聚乙烯醇（PVA）凝胶为固定化材料的微生物固定化方法进行了改进，并将其用于活性污泥的包埋。采用耗氧速率（OUR）表征固定化活性污泥的生物活性。制备了PVA-硼酸、PVA-硝酸钠和PVA-磷酸盐3种PVA固定化活性污泥颗粒，通过测定OUR值比较了它们的生物活性。采用不同的合成污水培养基（含250 mg/L COD和25 mg/L NH 4 +-N），测定了活性污泥中自养和异养微生物的生物活性。实验结果表明，活化后的三种固定化活性污泥的生物活性和稳定性都有较大提高。从生物活性和机械稳定性两方面考虑，PVA-磷酸盐法是一种经济可行的微生物固定化技术。
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.