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Using Coagulation and Dissolved Air Flotation to Treat Algae-Laden Water

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Title: Using Coagulation and Dissolved Air Flotation to Treat Algae-Laden Water
Author: Gu, Kaiyao
Department: School of Engineering
Program: Engineering
Advisor: Zhou, Hongde
Abstract: Algae inhabit in natural lakes and rivers. They often cause the clogging of filters, increase chemical costs and produce disinfection by-products (DBPs). Many methods have been used to remove algae in water treatment industry, among which are coagulation treatment and dissolved air flotation (DAF). The objectives of this study were to evaluate the performance of coagulation and DAF in treating algae-laden water. A series of experiments were conducted to study the effectiveness of coagulation and dissolved air flotation on removing Chlorella, Merismopedia, Microcystis and Aulacoseira by varying the coagulant dosage and water quality. The process performance was assessed by measuring turbidity, UV254 absorbance and TOC. Result showed that both two treatment methods could achieve over 80% algae removal. Moreover, the single-cell algae with oval shape were easier to be removed using coagulation process while DAF showed high cell removal efficiency for algae that form rectangular colonies.
Date: 2017-12
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