CHARACTERIZING THE REMOVAL OF DISINFECTION BY-PRODUCT PRECURSORS BY ARTIFICIAL MEDIA BASED ON MOLECULAR SIZE

摘要

The objective of this study is to apply a new bio-pre-treatment process to reduce the formation of disinfection by-products (DBPs). The characteristics of dissolved organic matter (DOM) in raw water from the Yangtze River, and the removal of DBP precursors at different molecular weight (M_w) fractions by two artificial media (assembled medium and elastic medium) were investigated. The low M_w fraction was found to be the most abundant one in the raw water, and the lower SUVA fraction was found to be the most reactive precursor to DBPs formation. Two artificial media achieved the DOC removal of 6.9% and 6.7%, respectively, and both exhibited a much better reduction of DBP formation potential (24.0% and 21.6% for THMs formation, 37.9% and 35.5% for HAAs formation). No significant trend was observed with respect to the removal of DOC, UV_(254) and the reduction of DBP formation potential from individual M_w fractions. The distribution of DOC concentration, UV_(254) absorbance and DBP formation potential changed little after the pretreatment with both artificial media.%Artificial medium; micro-polluted source water; dissolved organic matter (DOM); molecular weight (M_w); disinfection by-product formation potential (DBPFP)