| Immobilization of activated sludge using improved polyvinyl alcohol （PVA） gel |
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| 作者姓名： | ZHANG Li-sheng WU Wei-zhong WANG Jian-long |
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| 作者单位： | ZHANG Li-sheng WU Wei-zhong WANG Jian-long 1.Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China.2.College of Environmental Sciences,Peking University,Beijing 100871,China |
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| 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 NH_4~ -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.
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| 关 键 词： | 聚乙烯醇 凝胶体 生物活性 氧摄取率 |
| 收稿时间： | 10 January 2007 |
| 修稿时间： | 2007-01-10 |
Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel |
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| ZHANG Li-sheng,WU Wei-zhong,WANG Jian-long.Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel[J].Journal of Environmental Sciences,2007,19(11):1293-1297. |
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| Authors: | ZHANG Li-sheng WU Wei-zhong and WANG Jian-long |
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| Institution: | 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
2. College of Environmental Sciences, Peking University, Beijing 100871, China |
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| Abstract: | The microbial immobilization method using polyvinyl alcohol (PVA) gel as an immobilizing material was improved and used for entrapment of activated sludge. The OUR (oxygen uptake rate) 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 was 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. |
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| Keywords: | immobilization biological activity OUR (oxygen uptake rate) PVA polyvinyl alcohol improved activated sludge promising economical technique mechanical experimental results stability activation containing bioactivity microorganisms different synthetic wastewater media measuring value |
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