Improvement of Coagulation and Flocculation Process for Removal of Trihalomethane Precursor in Water Supply System
The objective of this research was to investigate the optimum conditions of natural organic matter removal by coagulation and flocculation processes. Water sample was collected from raw water intake at the water treatment plant located at Samut Sakorn province. The effects of coagulant dosages (Alum and PACl), initial pH and flocculant dosages (anion and cation polymers) were assessed. The indicators used for measuring treatment efficiency were turbidity and natural organic matter (NOM) in terms of UV-254, DOC and trihalomethane formation potential (THMFP). The results showed that an increase of the coagulant dosages led to increase turbidity and NOM removal. For both coagulants, the optimum initial pH was 6.0–7.0. It was found that the increase of anion polymer dosage caused higher removal percentage of turbidity but lower removal percentage of organic matter. On the contrary, for cation polymer, the higher removal efficiencies were found for all indicators. The optimum condition was the integration between PACl dosage 40 mg/L, initial pH 7.0 and cation polymer dosage 2.0 mg/L. The main influencing factor was initial pH. When the experimental results were compared with the removal efficiency of the water treatment plant, it was found that the removal of turbidity was compatible, but the significant higher of NOM removal was found from the experiments. The DOC UV- 254 and THMFP removals of the water treatment plant were 3.27, 0.00 and 0.05%, respectively. The removal efficiencies of these parameters of this study were 48.07–56.75, 39.84–47.24 and 25.71–30.16 %, respectively.
natural organic matter trihalomethane precursor chemical coagulation and flocculation water treatment
Pongsri PAOPUREE Mallika PANYAKAPO
Department of Environmental Science,Faculty of Science,Silpakorn University,Nakhon Pathom,73000,Thailand
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1018-1025
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）