Control of THMs Precursors by Alum Coagulation

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Patcharaporn Suwanvitaya
Siriporn Singkharothai


Natural organic matters (NOM) contamination is a worrisome challenge to water treatment plants. The use of alum and alum with PAC are common in treating surface water for household consumption.  This study investigated the effect of coagulation by alum and alum with PAC on NOM, focusing on organic fractions and trihalomethane formation potential (THMFP).  Water sample was collected from raw water reservoir for Bangkhla water treatment plant. It was found to contain 21.78 mgDOC/L with hydrophilic (HPI) fraction of 58.26% and hydrophobic (HPO) fraction of 41.74%.  The presence of NOM was confirmed by FEEM technique where humic –like, fulvic-like and tryptophan-like substances were detected.  Coagulation using alum (60 mg/L) and alum with PAC (60 + 60 mg/L) gave comparable results. DOC removals of 38.48% and 39.36% and were achieved.  The HPI and HPO fractions remained essentially the same as those of raw water. THMFP was reduced by 13.85 and 19.73%, respectively.


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