Abstract
In domestic rivers, eutrophication has led to frequent algae outbreaks. In this regard, this study investigated the algae removal characteristics according to coagulant dosage, light irradiation and coagulation nuclei dose to remove algae for drinking water treatment plant. The test results according to the natural coagulant dosage showed that as the coagulant dosage increased, chlorophyll-a and turbidity decreased, and chlorophyll-a removal efficiency ranged from 79.1% to 86.9%, and turbidity removal efficiency ranged from 74.6% to 88.2%, respectively. According to the results of test on the algae removal efficiency by light irradiation, chlorophyll-a removal efficiency increased from 17.9% to 34.4% as light intensity increased from 2000 lux to 10000 lux, and with an increase of light irradiation, the floating speed of algae turned out to be faster. The test results according to coagulation nuclei dose found that turbidity removal efficiency was 82.8%, and chlorophyll-a removal efficiency was 92.0% at the kaolin dose of 20 mg/L, which suggests that even a small dose of coagulation nuclei can further improve chlorophyll-a and turbidity removal efficiency.
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