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Removal Effect of THMs and THMFP by DAF and Sedimentation Process

Wenshu Zhu

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Abstract

The coagulation/dissolved air flotation(DAF) process and coagulation/sedimentation process were used to treat the prechloridized water in a waterworks of Tianjin,and the removal efficiency of trihalomethanes(THMs) and trihalomethane formation potential(THMFP) was investigated.The results show that the removal rates of THMs and THMFP by coagulation/DAF process are 37% and 55% respectively,being 18% and 21% higher than those by coagulation/sedimentation process(19% and 34%).After DAF process,the ratio of UV254/TOC in water is decreased significantly,which shows that the proportion of THMFP in organic mater is decreased significantly,and the formation of THMs during the follow-up chlorination disinfection process is reduced obviously.The removal effect of algae by coagulation/DAF process is better than that by coagulation/sedimentation process,and the removal effect of algae is better at high ξ-potential.

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What this paper is about

The coagulation/dissolved air flotation(DAF) process and coagulation/sedimentation process were used to treat the prechloridized water in a waterworks of Tianjin,and the removal efficiency of trihalomethanes(THMs) and trihalomethane formation potential(THMFP) was investigated.The results show that the removal rates of THMs and THMFP by coagulation/DAF process are 37% and 55% respectively,being 18% and 21% higher than those by coagulation/sedimentation process(19% and 34%).After DAF process,the ratio of UV254/TOC in water is decreased significantly,which shows that the proportion of THMFP in organic mater is decreased significantly,and the formation of THMs during the follow-up chlorination disinfection process is reduced obviously.The removal effect of algae by coagulation/DAF process is better than that by coagulation/sedimentation process,and the removal effect of algae is better at high ξ-potential.

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Available abstract

The coagulation/dissolved air flotation(DAF) process and coagulation/sedimentation process were used to treat the prechloridized water in a waterworks of Tianjin,and the removal efficiency of trihalomethanes(THMs) and trihalomethane formation potential(THMFP) was investigated.The results show that the removal rates of THMs and THMFP by coagulation/DAF process are 37% and 55% respectively,being 18% and 21% higher than those by coagulation/sedimentation process(19% and 34%).After DAF process,the ratio of UV254/TOC in water is decreased significantly,which shows that the proportion of THMFP in organic mater is decreased significantly,and the formation of THMs during the follow-up chlorination disinfection process is reduced obviously.The removal effect of algae by coagulation/DAF process is better than that by coagulation/sedimentation process,and the removal effect of algae is better at high ξ-potential.

Key concepts: Trihalomethane, Coagulation, Sedimentation, Chemistry, Water treatment, Algae, Dissolved air flotation, Environmental chemistry

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