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Received April 8, 2008
Accepted May 12, 2008
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천연 zeolite와 미생물을 이용한 NH4+및 NO3-의 동시 제거
Simultaneous Removal of Ammonium and Nitrate by Natural Zeolite and Bacteria
충남대학교 신소재 공학부, 305-764 대전시 유성구 궁동 220 1(주)시온텍, 305-500 대전시 유성구 용산동 530
Department of Chemical Engineering, Chungnam National University, 220, Gung-dong, Yuseong-gu, Daejeon 305-764, Korea 1Siontech Co., Ltd., 530 Yongsandong, Yuseong-gu, Daejeon 305-343, Korea
ihkim@cnu.ac.kr
Korean Chemical Engineering Research, October 2008, 46(5), 971-976(6), NONE Epub 10 November 2008
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Abstract
현재 암모늄과 질산이온에 의한 수질 오염은 생태계에 있어 심각한 문제로 떠오르고 있다. 미생물에 의한 생물학적인 제거 공정은 질화 과정과 탈질 과정으로 구분되는데 암모늄이온은 질화 과정에 의해 질산염 이온으로 산화되고 질산염 이온은 다음 단계인 탈질 과정에서 질소 기체로 되어 제거 된다. 천연 제올라이트는 양이온 교환능이 뛰어나 암모늄이온(NH4+)의 제거에 우수한 것으로 알려져 있지만 흡착만으로 암모늄과 질산이온(NO3- )을 충분히 제거할 수 없다. 이러한 문제를 해결하기 위해 제올라이트와 미생물을 이용해 생물학적인 방법으로 암모늄과 질산이온을 동시에 제거하기 위한 실험을 수행하였다. 암모늄이온의 제거는 분말형 Beneficial bacteria(Savio, USA)의 종배양 단계를 거쳐 제올라이트가 충진된 컬럼과 진탕배양을 동시에 하였을 경우에 14시간 후에 완전히 제거되었고 질산이온은 제올라이_x000D_
트에 미생물을 자연 흡착시켜 컬럼 처리시 4시간 후에 100% 제거됨을 확인하였다.
Water pollution by ammonium ion and nitrate is a common and growing problem in the ecosystem. Process of biological removal consists of nitrification and denitrification by bacteria. Ammonium is oxidized generally to nitrate by nitrification and nitrate is reduced to dinitrogen gas in the subsequent denitrification process. Although natural zeolite is well known for its ability to preferentially remove ammonium, it is not sufficiently removing ammonium ion and nitrate by_x000D_
adsorption. In order to overcome this problem, a method of biological removal with zeolite is used for simultaneous removal of ammonium and nitrate. As a result, in case of shaking culture with 1% seed and passing through zeolite column, the process revealed that ammonium ion could be removed completely after 14 hours. The removal of nitrate using columns with naturally adsorbed bacteria onto zeolite reached approximately 100% after 4 hours.
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