https://scholars.lib.ntu.edu.tw/handle/123456789/408377
Title: | Treating high-turbidity water using full-scale floc blanket clarifiers | Authors: | Lin W.W. Sung S.S. Chen L.C. Chung H.Y. Wang C.C. Wu R.M. Lee D.J. Huang C. Juang R.S. Peng X.F. Chang H.-L. |
Issue Date: | 2004 | Journal Volume: | 130 | Journal Issue: | 12 | Start page/Pages: | 1481-1487 | Source: | Journal of Environmental Engineering | 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, PACI) 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 PACI 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 PACI change. Not only was the produced blanket easily washed out when the PACI 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 PACI dosage. © ASCE. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408377 | ISSN: | 07339372 | DOI: | 10.1061/(ASCE)0733-9372(2004)130:12(1481) | SDG/Keyword: | Potable water; Sensitivity analysis; Turbidity; Water supply; Chemical dosage; Pilot tests; Polyaluminum chloride (PACL); Single-stage process; Dynamic response; coagulation; sludge blanket clarifier; turbidity; wastewater treatment |
Appears in Collections: | 化學工程學系 |
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