The removal of dissolved organic carbon from a polluted water source in southern Taiwan by coagulation and powder activated carbon (PAC) adsorption was investigated in light of increasing concern for the production of potentially toxic chlorinated organic products. The results of this study clearly indicated that the effects of coagulation and PAC adsorption on the removal of non-purgeable dissolved organic carbon (NPDOC) from Tungkang River water were complementary. Coagulation by aluminum sulfate (alum) or polydiallyldimethylammonium chloride (PDDAC) alone removed only about 40% NPDOC; this type of NPDOC being preferentially large organic molecules with negatively charged functional groups. On the other hand, at a 20- to 30-min contact time, PAC removed about 60% NPDOC, mostly low molecular weight and uncharged NPDOC. A total 90% removal of NPDOC from this polluted source water was achieved by a combined coagulation and PAC adsorption process.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)