||This study is focused to investigate the treatment efficiency for reducing disinfection by products and trace organic carbons in a water treatment plant. And the concentrations of empirical equations in effluent of treatment systems were established. In this study a biological filter (BF) was to treat the excess concentrations of trihalomethanes (THM), haloacetic acids (HAA), and assimilable organic carbon (AOC) in treated drinking water.|
In this study all experiments were including two steps: in first step tests were changing different empty bed contact times in a biological filter for investigating the treatment efficiencies of THM, HAA, and AOC. In second step the empirical equations of effluent concentrations in a biological filter were established. The results in first step showed the concentrations of THM in effluent of a biological filter were reduced to 5.0-14.0 μg/L when concentrations of THM in raw water were ranging from 16.0 to 32.0μg/L. When EBCT were set on 30 min、40 min、50 min、and 60 min, the average treatment efficiency of THM were about 43%、59%、63% 、and 64% respectively. The selections of EBCT by using a BF could be 50 and 60 minutes for the removal of THM was over 63%.When the concentrations of HAA were about 50μg/L in raw water, the effluent of a biological filter could reduce to 4 - 8 μg/L. When EBCT were set on 10 min、20 min、30 min、40 min, 50 min, and 60 min, the average treatment efficiency of HAA were about 66%, 70%, 86%, 88%, 85%, and 83% respectively. The selections of EBCT by using a BF could be 40, 50 and 60 minutes for the removal of HAA was over 80%.When the concentrations of AOC were about 49.2μg/L in raw water, the effluent of a biological filter could reduce to 29μg/L. When EBCT were set on 40 min and 50 min, the average treatment efficiency of AOC were about 50% and 60% respectively. The selections of EBCT by using a BF could be 40 and 50 minutes for the removal of AOC was over 50%.The results in second step showed the empirical equations of THM, HAA, and AOC in effluent of a BF were established by using an internet network method. The regressions of efficiencies (R2) in the empirical equations showed calculated values and measurement values had high relationships on three items of water quality.