|Table of Contents|

Application of AS/PDM Composite Coagulants in Turbidity Removal Treatment of Yangtze River Water in Autumn

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2010年02期
Page:
266-270
Research Field:
Publishing date:

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Title:
Application of AS/PDM Composite Coagulants in Turbidity Removal Treatment of Yangtze River Water in Autumn
Author(s):
LI Xiao-xiaoZHANG Yue-junJIA Jin-zhou
School of Chemical Engineering,NUST,Nanjing 210094,China
Keywords:
Yangtze River water autumn polydimethyldiallylalmmonium chloride aluminum sulfate composite coagulants turbidity removal
PACS:
TU991.2
DOI:
-
Abstract:
The enhanced coagulation processes of Yangtze River water in autumn using the steady composite coagulants which are prepared by aluminum sulfate(AS) and polydimethyldiallylalmmonium chloride(PDM) are reported here.Jar tests are used to study the influences of the composite ratios of AS to PDM and the intrinsic viscosity of PDM on the turbidity removal and precipitate performance.For the Yangtze River water at 16~18℃ and turbidity of 60~70 NTU in autumn,the results show that the dosage of 2.43 mg/L,2.25~2.00,1.97~1.85,1.59~1.66 mg/L are needed after treatment with AS and composite coagulants with the ratios of AS to PDM of 20∶1,10∶1,5∶1 and the PDM intrinsic viscosity of 0.52,1.53,2.47 dL/g,respectively,when the residual turbidity of 6.0 NTU is required.It means that the composite coagulants can be decreased at dose by 7.41%~17.70%,18.93%~23.87%,34.57%~31.69% compared with AS.When the residual turbidity of 2 NTU is required,the dosage of 3.93 mg/L is necessary for the treatment with AS,but the composite coagulants need dosage of 3.79~3.05 mg/L only,and can decrease the AS dose by 3.56%~22.39%.POM improves the turbidity removal efficiency of AS remarkably and enhances toughness and settleability of flocs.The lower the ratios of AS to PDM or the higher the intrinsic viscosity of PDM,the higher the turbidity removal efficiencies and settleability.

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Last Update: 2010-04-30