Trihalomethanes in Water Supply System and Water Distribution Networks

Sornsiri Sriboonnak, Phacharapol Induvesa, Suraphong Wattanachira, Pharkphum Rakruam, Adisak Siyasukh, Chayakorn Pumas, Aunnop Wongrueng and Eakalak Khan
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Sornsiri Sriboonnak: Ph.D.’s Degree Program in Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Phacharapol Induvesa: Bodhivijjalaya College, Srinakharinwirot University, Nakhon Nayok 26120, Thailand
Suraphong Wattanachira: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Pharkphum Rakruam: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Adisak Siyasukh: Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Chayakorn Pumas: Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Aunnop Wongrueng: Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Eakalak Khan: Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, NV 89154, USA

IJERPH, 2021, vol. 18, issue 17, 1-12

Abstract: The formation of trihalomethanes (THMs) in natural and treated water from water supply systems is an urgent research area due to the carcinogenic risk they pose. Seasonal effects and pH have captured interest as potential factors affecting THM formation in the water supply and distribution systems. We investigated THM occurrence in the water supply chain, including raw and treated water from water treatment plants (coagulation, sedimentation, sand filtration, ClO 2 -disinfection processes, and distribution pipelines) in the Chiang Mai municipality, particularly the educational institute area. The effects of two seasons, rainy (September–November 2019) and dry (December 2019–February 2020), acted as surrogates for the water quality profile and THM occurrence. The results showed that humic acid was the main aromatic and organic compound in all the water samples. In the raw water sample, we found a correlation between surrogate organic compounds, including SUVA and dissolved organic carbon (DOC) (R 2 = 0.9878). Four species of THMs were detected, including chloroform, bromodichloromethane, dibromochloromethane, and bromoform. Chloroform was the dominant species among the THMs. The highest concentration of total THMs was 189.52 ?g/L. The concentration of THMs tended to increase after chlorination when chlorine dioxide and organic compounds reacted in water. The effect of pH on the formation of TTHMs was also indicated during the study. TTHM concentrations trended lower with a pH ? 7 than with a pH ? 8 during the sampling periods. Finally, in terms of health concerns, the concentration of TTHMs was considered safe for consumption because it was below the standard (<1.0) of WHO’s Guideline Values (GVs).

Keywords: disinfection byproducts; distribution networks; trihalomethanes (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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