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This study showed that the trihalomethane (THM) concentration in finished water that had been treated at 35.6 degrees F (2 degrees C) was significantly lower than in water treated at 71.6 degrees F (22 degrees C). Water temperature did not appear to affect the removal of total organic carbon (TOC) during coagulation with metal ion salts, but color removal was slightly reduced at low temperatures. The efficiency of coagulation for removing TOC, color, and THM formation potential improved when the water was treated at pH 5 rather than pH 7, regardless of temperature. Removal of low-molecular-weight organic substances was found to be more difficult at 35.6 degrees F than at 71.6 degrees F. The data obtained suggest that reduced THM concentrations in finished water during winter are strictly a function of the reduced rate of THM formation. Includes 15 references, tables, figures.

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Edition: Vol. 78 - No. 4 Published: 04/01/1986 Number of Pages: 7File Size: 1 file , 1.4 MB