In light of increasing concern for the organic content of potable water supplies and the production of potentially toxic chlorinated organic products, a better understanding of the character of organics removed by commonly used treatment processes is desirable. A variety of chemical and physical characterization techniques were used to identify the changes in organic character resulting from chemical treatments of a Mississippi River water sample.
Studies with miniature columns of granular activated carbon (GAC) demonstrated the importance of pH in the removal of total organic carbon and trihalomethane precursors from coagulated Mississippi River water.
Coagulation of Mississippi River water improved the removal of total organic carbon (TOC) and trihalomethane precursors by granular activated carbon. This increased removal is thought to be due to the reductions in TOC and in poorly adsorbed higher‐molecular‐weight organics that are achieved by coagulation. A cost analysis indicated that very high coagulant dosages would be needed during pretreatment to minimize the overall costs of chemical treatment.
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