US EPA

7447009 

Journal Article 

Advantages of Prepressure over Preoxidation for Microcystis aeruginosa Removal from Drinking Water Sources 

Sun, F; Cong, H; Jiang, X; Chen, W; Xu, S; Liu, Y 

2019 

Yes 

Journal of Environmental Engineering
ISSN: 0733-9372
EISSN: 1943-7870 

American Society of Civil Engineers (ASCE) 

145 

12 

English 

10.1061/(ASCE)EE.1943-7870.0001591 

WOS:000490296600007 

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 2 mg·L-1 chlorine oxidation for 30 min, 2 mg·L-1 KMnO4 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 KMnO4 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) > KMnO4 preoxidation coagulation and sedimentation (KMnO4 OCS) > chlorine preoxidation coagulation and sedimentation (chlorine OCS). © 2019 American Society of Civil Engineers. 

Microcystis aeruginosa; Prepressure; Microcystins; Disinfection byproducts; Water quality