| Application of Chitosan Flocculant to Conditioning Sludge |
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| 作者姓名： | 李步祥 陈亮 陈东辉 张印堂 |
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| 作者单位： | Institute of Environmental Engineering，Shanghai Normal University，shanghai 200233，School of Environmental Science and Engineering，Donghua University，Shanghai 200051，School of Environmental Science and Engineering，Donghua University，Shanghai 200051，School of Environmental Science and Engineering，Donghua University，Shanghai 200051 |
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| 摘 要： | The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant.
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Application of Chitosan Flocculant to Conditioning Sludge |
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| LI Bu-xiang Institute of Environmental Engineering,Shanghai Normal University,shanghai CHEN Liangi CHEN Dong-hui ZHANG Yin-tang School of Environmental Science and Engineering,Donghua University,Shanghai.Application of Chitosan Flocculant to Conditioning Sludge[J].Journal of Donghua University,2003,20(2). |
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| Authors: | LI Bu-xiang Institute of Environmental Engineering Shanghai Normal University shanghai CHEN Liangi CHEN Dong-hui ZHANG Yin-tang School of Environmental Science and Engineering Donghua University Shanghai |
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| Institution: | 1. Institute of Environmental Engineering, Shanghai Normal University, shanghai 200233
2. Shool of Environmental Science and Engineering, Donghua University, Shanghai 200051 |
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| Abstract: | The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant. |
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| Keywords: | Chitosan Flocculant Activated Sludge Sludge Dehydrating Conditioning |
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