호소수에 대한 막여과 공정 설계 및 운영인자를 도출하기 위하여 부산시 소재 회동 수원지의 물을 원수로 하는 200 m3/일 용량의 정수처리 침지식 막여과 pilot을 운영하였다 (운영기간 : 2018년 1월 ~ 9월). 막여과 공정 운영 관점에서 주요한 원수 수질변화로는 1월 ~ 2월 사이 수온이 5 ℃ 이하를 유지하였고, 6~7월의 평균 탁도는 24±40 NTU 이었으며, 7월 중 태풍 발생으로 인하여 약 229 NTU의 고탁도가 유입되었다. 막여과 pilot 운영결과를 바탕으로 막여과 공정의 주요 설계값인 막여과 유속, 막여과 차압, 약품 세척 주기 및 단위공정의 운전순서를 결정하였다. 운영결과 중에서 특별히 괄목할 만한 관찰점은 막여과 배출수 탁도의 중력침전 제거율이 평균 94±4%로 분석된 것이다.

Algal problem in drinking water treatment is being gradually increased by causing deterioration of water supplies therefore, especially taste and odor compounds such as geosmin and 2-MIB occur mainly aesthetic problem by its unpleasant effects resulting in the subsequent onset of complaints from drinking water consumer. Recently, geosmin and 2-MIB are detected frequently at abnormally high concentration level. However, conventional water treatment without advanced water treatment processes such as adsorption and oxidation process, cannot remove these two compounds efficiently. Moreover, it is known that the advanced treatment processes i.e. adsorption and oxidation have also several limits to the removal of geosmin and 2-MIB. Therefore, the purpose of this study was not only to evaluate full scale nanofiltration membrane system with 300 m3/ day of permeate capacity and 90% of recovery on the removal of geosmin and 2-MIB in spiked natural raw water sources at high feed concentration with a range of approximately 500 to 2,500 ng/L, but also to observe rejection property of the compounds within multi stage NF membrane system. Rejection rate of geosmin and 2-MIB by NF membrane process was 96% that is 4% of passage regardless of the feed water concentration which indicates NF membrane system with an operational values suggested in this research can be employed in drinking water treatment plant to control geosmin and 2-MIB of high concentration. But, according to results of regression analysis in this study it is recommended that feed water concentration of geosmin and 2-MIB would not exceed 220 and 300 ng/L respectively which is not to be perceived in drinking tap water. Also it suggests that the removal rate might be depended on an operating conditions such as feed water characteristics and membrane flux. When each stage of NF membrane system was evaluated relatively higher removal rate was observed at the conditions that is lower flux, higher DOC and TDS, i.e., 2nd stage NF membrane systems, possibly due to an interaction mechanisms between compounds and cake layer on the membrane surfaces.