WANG Xiao-yun,JIANG Zhu-wu,FU Ai-min.Effect of Raw Water Hardness on Algae Removal by Ozone or Potassium Permanganate Preoxidation[J].China Water & Wastewater,2021,37(1 1):46-50.
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Effect of Raw Water Hardness on Algae Removal by Ozone or Potassium Permanganate Preoxidation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 1 1 Page: 46-50 Column: Date of publication: 2021-01-01
Author(s):
WANG Xiao-yun1; 2; JIANG Zhu-wu1; 2; FU Ai-min3
(1. College of Ecological Environment and Urban Construction， Fujian University of Technology， Fuzhou 350008, China； 2. Center for Safety and Energy Conservation Techonlogy of Urban Water Supply and Drainage System， Fuzhou 350008, China； 3. Fujian Ningde Nuclear Power Company Limited， Ningde 355200, China)
Keywords:
raw water hardness; algae removal; ozone preoxidation; potassium permanganate preoxidation; coagulation; Zeta potential
Abstract:
In order to understand the effect of raw water hardness on algae removal, green algae in raw water with different calcium hardness of 50-300 mg/L was removed by ozone preoxidation-coagulation or potassium permanganate preoxidation-coagulation. Coagulation tests showed that different concentrations of calcium ions could significantly enhance the algae removal efficiency by ozone preoxidation-coagulation and potassium permanganate preoxidation-coagulation. When the concentration of calcium ion was low, the algae removal efficiency of ozone preoxidation-coagulation was better than that of potassium permanganate preoxidation-coagulation. However, when the hardness of calcium was higher than 90 mg/L, the algae removal efficiency of potassium permanganate preoxidation-coagulation was better than that of ozone preoxidation-coagulation. Three sets of parallel test data of actual raw water in waterworks also proved that potassium permanganate preoxidation-coagulation had better algae removal efficiency than that of ozone preoxidation-coagulation in high hardness environment.
Last Update: 2021-01-01