활성탄 흡착지에서 응집조건에 따른 자연유기물질과 이？취미(Geosmin, 2-MIB) 파과특성에 관한 연구

Abstract

It is well-known that the presence of NOM (natural organic matter) in water has a negative effect onremoving taste and odor compounds by activated carbon adsorption. Therefore, various means such asenhanced coagulation are applied to reduce the NOM. The presence of taste & odor compounds in drinkingwater even parts per trillion, is enough to generate customer dissatisfaction. Therefore, the aim of thisstudy was to evaluate carbon usage rate (CUR) for conventional coagulation (CC) and enhanced coagulation(EC) in order to improve the efficiency of adsorption of taste and odor compounds. Also, Effect of CC andEC on molecular weight fraction and the early stage breakthrough of 2-MIB and Geosmin are evaluated.When the enhanced coagulation was adapted for pretreatment for activated carbon adsorption theoperation period could be prolonged by 3.5~4 times. CUR for CC was about 2 times greater than CUR forEC and this means that EC has more adsorption capacity than CC. To analyze effect of EC and CC onbreakthrough of 2-MIB quantitatively, adsorbed NOM mass was calculated based on unit mass of activatedcarbon. In the early stage breakthrough of 2-MIB, total adsorbed NOM was 23.72mg/g for CC and34.56mg/g for EC. Therefore, it is shown that the early breakthrough term of 2-MIB and Geosmin wasimproved due to increased adsorbability. The low-molecular-weight NOM (500~2000Da) compounds werethe most competitive, participating in direct competition with 2-MIB for adsorption site.