Advantages of Prepressure over Preoxidation for Microcystis aeruginosa Removal from Drinking Water Sources
Publication: Journal of Environmental Engineering
Volume 145, Issue 12
Abstract
Water quality is a critical factor in the treatment of Microcystis aeruginosa–contaminated water sources. In this paper, we report on a pressure pretreatment method that is safer than the traditional preoxidation treatment for the removal of Microcystis aeruginosa from water obtained from Taihu Lake in China. The experimental results indicated that the removal efficiency of Microcystis aeruginosa was significantly improved when the water was pressurized at 0.3–0.7 MPa for 1 min, and the optimal removal efficiency was obtained at a pressure of 0.7 MPa. The removal efficiency of Microcystis aeruginosa by direct coagulation and sedimentation without a pretreatment was only 56.3%, whereas the pretreatments of chlorine oxidation for 30 min, oxidation for 30 min, and a prepressure treatment at 0.7 MPa for 1 min resulted in an increase in the removal efficiency to 68.4%, 72.1%, and 90.5%, respectively. The chlorine preoxidation increased the concentrations of the microcystins, dissolved organic carbon (DOC), and disinfection byproducts of the treated water; the preoxidation slightly increased the DOC and byproducts of the treated water; whereas the prepressure treatment did not increase the microcystin concentration but reduced the concentrations of the DOC and disinfection byproducts in the treated water. Therefore, the relative ranking of the methods in terms of water quality based on the concentration change of the microcystins, DOC, and byproducts following treatment was prepressure coagulation and sedimentation (PCS) > direct coagulation and sedimentation without a pretreatment (CS) > preoxidation coagulation and sedimentation ( OCS) > chlorine preoxidation coagulation and sedimentation (chlorine OCS).
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Acknowledgments
The authors acknowledge financial support from the National Natural Science Foundation of China (51708480), the National Natural Science Foundation of China (51178408), the Natural Science Foundation of Jiangsu Province (BK20150456), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (15KJD610006), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the Yangzhou Key Research Project of Social and Development (YZ2015072).
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Published In
Journal of Environmental Engineering
Volume 145 • Issue 12 • December 2019
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©2019 American Society of Civil Engineers.
History
Received: Nov 23, 2018
Accepted: Mar 14, 2019
Published online: Oct 3, 2019
Published in print: Dec 1, 2019
Discussion open until: Mar 3, 2020
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