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Pilot Study of Yangtze River Water Treatment in the Winter by Sludge Return

Autor(en):



Medium: Tagungsbeitrag
Sprache(n): Englisch
Tagung: 2012 International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2012), August 10-12th 2012, Zhangjiajie (China)
Veröffentlicht in:
Seite(n): 1915-1922
DOI: 10.4028/www.scientific.net/AMM.209-211.1915
Abstrakt:

In order to optimize the dosage and improve the coagulation effect when Yangtze river with low temperature and low turbidity was treated by conventional treatment in the winter, pilot study of enhanced conventional treatment was conducted by dosing two coagulant respectively and returning sludge in sedimentation tank to flocculant tank, so the optimal ratio of sludge return and the impacts of sludge return on effluent turbidity in sedimentation tank and the remove effect of CODMnwas discussed. The results indicates that the optimal sludge return ratio for Yangtze river in winter is 8%. Under 8% sludge return ratio,the dosage is reduced from 12mg/L (under no sludge return) to 3mg/L~6 mg/L, and dosage is saved 50%~75%. When dosing respectively 3mg/L~6 mg/L composite coagulant and 3mg/L~6 mg/L polymeric aluminum chloride, it can make average effluent turbidity in sedimentation tank decrease to 3.7NTU~2.4 NTU,8.1NTU~4..4 NTU respectively and the average removal rate of turbidity and CODMncan reach up to 94.3%~96.3%, 89.9%~94.5%,30.8%~39%,32.5%~38.6% respectively, so the requirement of effluent turbidity in sediment tank is met. Comparing to the treatment effect under no sludge return condition, sludge return can not only improve the treatment effect but also reduce the dosage greatly.

Structurae kann Ihnen derzeit diese Veröffentlichung nicht im Volltext zur Verfügung stellen. Der Volltext ist beim Verlag erhältlich über die DOI: 10.4028/www.scientific.net/AMM.209-211.1915.
  • Über diese
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  • Reference-ID
    10327351
  • Veröffentlicht am:
    24.07.2019
  • Geändert am:
    24.07.2019
 
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