Treating High-Turbidity Water Using Full-Scale Floc Blanket Clarifiers

doi:10.1061/(ASCE)0733-9372(2004)130:12(1481)

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Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/88210

Title:	Treating High-Turbidity Water Using Full-Scale Floc Blanket Clarifiers
Authors:	W. W. Lin;S. S. Sung;L. C. Chen;H. Y. Chung;C. C. Wang;Wu, R. M.;D. J. Lee;C. Huang;R. S. Juang;X. F. Peng;H. L. Chang
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	Water treatment;Taiwan, Water distribution;Flocculation;Potable water;Water quality
Date:	2004-12
Issue Date:	2013-04-13 18:01:06 (UTC+8)
Publisher:	American Society of Civil Engineers (ASCE)
Abstract:	Dynamic responses of the blanket in full-scale flat-bottom type floc blanket clarifiers at the PingTsan Water Works, Taiwan Water Supply Corporation, were monitored given a step-change in coagulant (polyaluminum chloride, PACl) dosage. The blankets in the clarifiers were easily washed out using the conventional coagulation-clarification process (the “single-stage process”), seriously threatening drinking water quality. Consequently, the PingTsan Water Works included a pretreatment stage before the single-stage process to enhance treatment efficiency. The performance of this full-scale “two-stage process” for treating high-turbidity storm water was monitored on November 9 to 10, 2000. The two-stage process achieved a stable blanket and good quality clarified water that was insensitive to variation in raw water turbidity or PACl dose. Pilot tests were also conducted on October 6 to 7, 2001 to reveal performance differences between the single-stage and two-stage processes in dealing with high-turbidity water. The single-stage process yielded a blanket that was sensitive to PACl change. Not only was the produced blanket easily washed out when the PACl dose was step-decreased, it was also slow to recover when the chemical dosage was returned to its original value. The blanket yielded by the two-stage process was more robust to low coagulant dose, and recovered more easily when coagulant supply was increased. Applying the two-stage process to achieve the same effluent quality from single-stage process could significantly reduce total PACl dosage.
Relation:	Journal of Environmental Engineering - ASCE 130, pp.1481-1487
DOI:	10.1061/(ASCE)0733-9372(2004)130:12(1481)
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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