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| Flocculation-thickening of Silt from Xunsi River in Wuhan |
| Received:March 16, 2016 Revised:August 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.04.030 |
| KeyWord:river silt dehydration flocculation sedimentation suspension-water interface |
| Author | Institution |
| XIAO Qu |
School of Resources and Environment, Hubei University of Technology, Wuhan , China |
| PI Ke-wu |
School of Resources and Environment, Hubei University of Technology, Wuhan , China |
| CHEN Shu-yu |
Hubei Province Key Laboratory for Ecological Restoration of Lakes and Utilization of Algae, Wuhan , China |
| WANG Hui-jun |
Hubei Province Key Laboratory for Ecological Restoration of Lakes and Utilization of Algae, Wuhan , China |
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| Abstract: |
| Objective To study the variation of sedimentation rate, concentration ratio and sludge settling index of the suspension-water interface of silt from the Xunsi River in Wuhan under different dosages of Ca(OH)2 and PAM. Methods Sedimentation test was carried out for silt from the Xunsi River in Wuhan. The dehydrating agent with optimum dehydration effect was found out through the test. Results The results showed that when the mass fraction was 10%, silt dehydration had the optimum effect with the dose ratio of Ca(OH)2 5 g/L and PAM 0.04 g/L. In the best situation, the sedimentation rate of the suspension-water interface could reach 3.7 cm/min, the concentration ratio 3.94, and the sludge settling index 24.9%. Conclusion Ca(OH)2 and PAM can promote the dehydration of the silt. Silt has gone through four processes: free sedimentation, flocculation sedimentation, regional sedimentation and compression sedimentation under the combined effect of Ca(OH)2 and PAM. |
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