TIANJun-li,JIANGJian-wei,WEIGuo-qiang,et al.Effect of Chlorine Dosing Mode on Algae Control and Disinfection By-products Formation in Waterworks[J].China Water & Wastewater,2023,39(11):30-34.
Effect of Chlorine Dosing Mode on Algae Control and Disinfection By-products Formation in Waterworks
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
30-34
Column:
Date of publication:
2023-06-01
- Keywords:
- raw water from the South-to-North Water Diversion Project; algae control; chlorine dosing mode; disinfection by?products
- Abstract:
- At present, many waterworks adopt the same mode of chlorine dosing points in different seasons to facilitate operation. It is costly, wasteful and poses a high risk of the disinfection by-products (DBPs) formation. Taking raw water from the South-to-North Water Diversion Project in Tianjin as the research object, the coagulation-air floatation-filtration-disinfection process of a waterworks was simulated. Comparative studies of single point chlorine and multi-point chlorine were conducted to explore their efficiency of controlling algae, killing germs and controlling DBPs (such as trihalomethanes, haloacetic acids, haloacetonitrile and halogenated nitromethanes) in high and low algal phases. The proposed solution of seasonal chlorine dosing processes is suggested: pre-chlorination before coagulation (chlorine dosage of 0.5 mg/L) + chlorination with ammonia after filtration (ammonia dosage of 0.3 mg/L, chlorine dosage of 1.0 mg/L) during the high algae period in summer, and single point chlorination with ammonia after filtration (chlorine dosage of 1.1 mg/L) during the low algae period in winter.
Last Update:
2023-06-01