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Volume 38 Number 4 Volume 39 Number 1 Volume 39 Number 2

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Research articles

ScienceAsia 39 (2013): 55-65 |doi: 10.2306/scienceasia1513-1874.2013.39.055

Reduction of fractionated dissolved organic matter and their trihalomethane formation potential with enhanced coagulation

Charongpun Musikavonga,b,*, Kamonnawin Inthanuchita, Kanjanee Srimuanga, Thunwadee Tachapattaworakul Suksarojc, Chaisri Suksaroja

ABSTRACT:     The trihalomethane formation potential (THMFP) of the raw water supply from the U-Tapao Canal, Songkhla, Thailand and the THMFP of the hydrophobic organic fraction (HPO) and hydrophilic organic fraction (HPI) of the raw water supply were determined. The canal has been contaminated with treated and untreated wastewater from communities, agricultural processes, and industrial activities. Water samples were collected 3 times from an intake point of the water treatment plant located downstream of the canal. We found an average dissolved organic carbon (DOC) of 7.4 mg/l and a THMFP of 630 µg/l in the raw water. We also found a DOCHPO of 3.3 mg/l, a DOCHPI of 3.7 mg/l, a THMFPHPO of 281 µg/l, and a THMFPHPI of 348 µg/l. Strong fluorescent peaks of tryptophan-like and humic and fulvic acid-like substances were detected in the raw water. The optimal condition of polyaluminium chloride (PACl) coagulation for removing dissolved organic matter was obtained at a PACl of 40 mg/l at pH 7. Under such conditions, it could reduce the average DOC to 55% and THMFP to 48%. The PACl coagulation reduced the fluorescent intensity of humic and fulvic acid-like substances more than tryptophan-like substances. The best reduction observed of DOC was 76% and THMFP was 83%; this was obtained by using a PACl of 40 mg/l with 1 mg/l of polymer and 80 mg/l of powder activated carbon. Under such conditions, there was consistent removal of an average DOCHPO, DOCHPI, THMFPHPO, and THMFPHPI by 85, 68, 81, and 79%, respectively. Such a condition was capable of reducing trihalomethanes to meet the World Health Organization standards.

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a Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112 Thailand
b Centre of Excellence for Environmental and Hazardous Waste Management (EHWM), Bangkok 10330 Thailand
c Faculty of Environmental Management, Prince of Songkla University, Hat Yai, Songkhla 90112 Thailand

* Corresponding author, E-mail: mcharongpun@eng.psu.ac.th

Received 26 Jun 2012, Accepted 1 Oct 2012