| The formation of disinfection by-products(DBPs) is one of the major issue for drinking water quality control. Whenever raw water or organic compounds extracted from natural water are chlorinated, significant concentrations of Trihalomethanes (THMs) and Haloacetic acids (HAAs) are produced. With recent advances in the analysis of chlorination by-products and their health effects, numerous organic halides HAAs, THMs, haloacetonitriles, etc have been identified at low level. Animal studies have demonstrated that dichloroacetic acid(DCAA) causes carcinogen. Five of HAAs (MCAA, DCAA, TCAA, MBAA and DBAA) are regulated under the U.S Environmental Protection Agency`s proposed Disinfectant/Disinfection By-Products Rule. The goal of this study was to control HAAs contaimed in Pusan`s drinking water. The results obtained from this study are as fellow. 1) HAAs concentrations of H, D, M water treatment plants are 1∼22㎍/l (6.8), 1∼16㎍/l (8.4), 0.4∼16㎍/l (2.6) respectively. This results is very low value comparing to USEPA DBPs Rule of HAAs. 2) HAAs speciation in Pusan`s drinking water is generally in the order : DCAA(41∼51%) > TCAA (23∼38%) > DBAA(18∼30%) > MBAA(2∼5%) > MCAA(O%), which shows DCAA and TCAA were the dominant compounds. 3) HAAs was seen to be decreased rapidly in the sand filter of a water treatment plant. This was caused by the HAAs biodegraded in the sand filter. In addition, HAAs can be removed in the advanced treatment process althought an adsoption of the THMs is gone. 4) From the results of the batch experiment, HAAs was seen to be removed by the biodegradation by microorgarnism in the sand filter. 5) THMs and HAAs in distribution system were 1.3∼1.6. 1.4∼2.1 times higher than in final water in plant, respectively so it can be concluded that the longer distance from the plant, the more concentrations of them. |
|
PDF
