Effects of preoxidation methods on DBPs formation in treatment of eutrophicated water
Date Issued
2007
Date
2007
Author(s)
Chen, Wei-Chih
DOI
zh-TW
Abstract
Pre-chlorination is widely used in drinking water treatments to remove contaminants in raw water, reduce the coagulants cost and enhance the efficiency of operation process. However, chlorine reacts with natural organic matter (NOM) may also produce disinfection by-products (DBPs); and the presence of algae also increases DBPs precursors, from both intracellular organic matter (IOM) and extracellular organic matter (EOM).
Moreover, the reaction between chlorine and algal cells in eutrophic raw water during prechlorination may also increase the DBPs precursors in treated water because of the destruction of algal cells. Besides its impact on conventional water treatment processes, higher DBPs formation from prechlorination would raise the risk on human health.
This study intends to find an alternative preoxidant for treatment of eutrophic water. Potassium permanganate, ozone and chlorine dioxide were selected as the alternative preoxidants. The laboratory-cultured Microcystis aeruginosa (a species of blue-green algae) were chosen as the representative algae to evaluate the formation potential of DBPs from IOM and EOM after preoxidation and conventional water treatments.
The results showed that suitable control of preoxidants dosage and contact time could decrease trihalomethanes (THMs) precursors in treated water, but may increase the haloacetic acids (HAAs) precursors when laboratory cultured algal cells were used. However, preoxidation with ozone and chlorine for IOM produced higher level of DBPs precursors in treated water than potassium permanganate and chlorine dioxide. After conventional treatment processes, it was observed that potassium permanganate had better removal efficiency for DBPs precursors in IOM.
Subjects
消毒副產物
銅綠微囊藻
氯
臭氧
二氧化氯
Disinfection by-products
Microcystis aeruginosa
Chlorine
Potassium permanganate
Ozone
Chlorine dioxide
SDGs
Type
thesis
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