|Table of Contents|

Coagulation and Algae-removal Effects of AS/PDM on Winter Taihu Lake Water under Prechlorination Process

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

Issue:
2009年04期
Page:
528-533
Research Field:
Publishing date:

Info

Title:
Coagulation and Algae-removal Effects of AS/PDM on Winter Taihu Lake Water under Prechlorination Process
Author(s):
ZHANG Yue-junZHAO Xiao-leiLI Xiao-xiaoLIU ChengZHU Ling-ling
School of Chemical Engineering,NUST,Nanjing 210094,China
Keywords:
polydimethyldiallylammonium chloride aluminum sulfate composite coagulants algae-removal prechlorination winter Taihu Lake water
PACS:
X524
DOI:
-
Abstract:
The algae-removal effects of the series stable AS/PDM composite coagulants prepared by aluminum sulfate(AS) and polydimethyldiallylammonium chloride(PDM) on winter Taihu Lake chlorine-added water under prechlorination process are researched.The effects of composite coagulants dosages,composite mass ratios(20∶1,10∶1,5∶1) of AS to PDM,intrinsic viscosity values(0.55,1.53,2.47,3.99 dL/g) of PDM on algae-removal rates are studied through coagulation and algae-removal experiments.The results show that when residual turbidity of 2 NTU after coagulation and sedimentation is required by water plant,the dosages(based on Al2O3) of AS,AS/PDM(0.55/20∶1~3.99/5∶1) composite coagulants are 4.50mg/L,4.00~2.00 mg/L,and the algae-removal rates are 92.09%,93.91%~96.55% respectively.When dosages are 4.50mg/L,the algae-removal rates of AS,AS/PDM(0.55/20∶1~3.99/5∶1) composite coagulants are 92.09%,95.22%~99.07%,and the residual turbidities are 2.00 NTU,1.57~0.48 NTU respectively.When dosages are 4.50 mg/L,the coagulants with low composite ratio(5∶1) of four intrinsic viscosity values and the coagulants with high intrinsic viscosity value(3.99 dL/g) of three composite ratios averagely increase 2.41 and 1.40 percent algae-removal rates respectively,compared with the coagulants with high composite ratio(20∶1) and the coagulants with low intrinsic viscosity value(0.55 dL/g).Using AS/PDM composite coagulants can evidently enhance the treatment effect of AS on winter Taihu Lake chlorine-added water.Compared with the single use of AS,the AS dosages in composite coagulants are saved if the residual turbidities are required in the same level,and the treatment effects are enhanced when the AS dosages in composite coagulants are the same as the AS dosage of using AS solely.The lower the composite ratio or the higher the intrinsic viscosity value is,the better the effect of AS/PDM composite coagulant is.

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Last Update: 2012-11-19