Abstract
Using indoor sand columns with effluent from A2O (anaerobic-anoxic-oxic)-O3 process, removal characteristics of disinfection by-products formation potential (DBPsFP), including trihalomethanes and haloacetic acids, bromate ion and aldehydes and effects of ozonation process on soil aquifer treatment (SAT) were discussed. Removal ratios of dissolved organic carbon were 77, 78 and 82%, respectively, in the columns with A2O treated water and A2O-O3 (ozone consumption per initial dissolved organic carbon: 1.0 and 2.0 mgO3/mgC) treated water, and combination of O3 and SAT enhanced organic removal. Removal ratios of CHCl3FP were 90-98%, and effective removal of DBPs with chlorine in soil aquifer treatment was suggested. Removal ratios of CHBr2ClFP was only 13% with soil aquifer treatment; meanwhile, it was 69% with the combination of O3 process and SAT. Therefore, it was suggested that the O3 process enhanced removal potential of DBPs with bromine in SAT. Moreover, it was found that the removal of bromate ion was dominated by the adsorption onto the sand surface; meanwhile, the biodegradation mainly contributed to the removal of aldehydes in SAT.
