Mini-module을 이용한 막투과유속 평가와 세정폐액 분석을 통한 I 막여과 정수장에서의 막오염 원인물질 규명 = Investigation of Membrane Fouling Materials in I Membrane Water Treatment Plant by Analyzing Discharge Liquid from CIP Processes and the Flux Test using the Mini-Modules

다국어 초록 (Multilingual Abstract)

In the case of I membrane filtration water treatment plant, it was estimated that membrane fouling rate was low due to the low concentration of manganese and iron in the raw water. However, recently, the concentration of both manganese and iron in the raw water has been increasing, and the membrane fouling rate also increased. In order to identify the precise membrane foulants, we evaluated the recovery rate at each CIP stage, and we also analyzed the discharged liquid from CIP processes to investigate the membrane fouling materials. And mini-modules were manufactured by using the contaminated membrane module fiber, and the flux-test was performed after cleaning by each CIP condition. The flux-test results showed that most of the flux recovered at the acid washing condition in the CIP process, and manganese and aluminum were main compounds in CIP liquid. As a result of CIP test using mini-modules, the citric acid washing condition, which has high manganese dissolution efficiency, showed a higher recovery rate of membrane fouling than the hydrochloric acid washing condition. Therefore, manganese was estimated to be the main membrane fouling material in I membrane water treatment plant.

국문 초록 (Abstract)

I 막여과 정수장은 초기에는 원수 내 막오염 원인물질 중 망간 및 철의 농도가 낮아 막오염 속도가 낮았던 것으로평가되었다. 그러나 최근에는 원수 내 망간과 철의 농도 증가가 나타나고 있으며, 이와 함께 막차압도 함께 증가하였다. 정확한 막오염 원인물질을 규명하기 위해 실제 I 정수장에서 이뤄진 약품세정 공정 중 단계별 회복률과 폐액 중 막오염 원인물질을 분석하였고, 또한 실제로 오염된 막모듈 fiber를 이용해 mini-module을 만들어 각 세정 조건별로 세정 후 막투과유속 평가를 수행하였다. 막투과유속 평가결과 약품세정(CIP) 조건 중 산세정 조건에서 막투과유속이 대부분 회복 되었으며, CIP 폐액분석결과 망간과 알루미늄이 폐액 내 주요 구성물질인 것으로 나타났다. 그리고 mini-module를 이용한 CIP 평가결과로부터망간 용출 효율이 우수했던 구연산 산세정 조건이 염산 단독 산세정 조건에 비해 막오염 회복률이 더 큰 것으로 나타나, 망간이 I 막여과 정수장에서 주요 막오염 원인 물질인 것으로 판단되었다.

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