생물학적 퍼클로레이트와 질산염 환원에 대한 염분의 저해 영향
Salinity Inhibition Effects on Biological Perchlorate and Nitrate Reduction
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본 연구는 플라스크 회분식 실험과 고정생물막반응조를 이용하여 생물학적 퍼클로레이트와 질산염의 환원에서 염분이 미치는 저해 영향에 대해 조사하였다. 회분식 실험에서 염분농도(1.5%, 3% NaCl)가 증가할수록 퍼클로레이트와 질산염의 제거속도가 느려짐을 보였다. 고정생물막반응조의 유입수에서 염분농도를 0에서 3%까지 점차로 증가시켰을 때 2% NaCl에서 10mg/L 유입 퍼클로레이트는 완전히 제거되었다. 하지만 3% NaCl이 유입될 때 퍼클로레이트의 제거율은 급격히 하락하여 평균 28.4%의 제거율을 보였다. 1mg/L 퍼클로레이트와 66.4mg/L 질산염이 유입되는 고정생물막반응조에서 1.5% NaCl에서 퍼클로레이트와 질산염은 동시에 제거가 되었다. 비록 3% NaCl에서 고염분에 의한 영향으로 퍼클로레이트의 측정이 불가능하였지만, 생물막반응조에서 3% NaCl은 질산염 환원을 저해하였으며, 질산염 제거율은 평균 53.9%였다.
Abstract
In this study, the inhibitory effects of high salinity on biological perchlorate and nitrate reduction were investigated in flask batch tests and fixed biofilm reactor. Biological perchlorate and nitrate reduction rates at 1.5% and 3% NaCl were lower than 0% NaCl in batch tests. When salt concentrations in the feed were gradually increased from 0% to 3% NaCl, 10mg/L of perchlorate was completely reduced at 2% NaCl in a fixed biofilm reactor. However, at 3% NaCl, perchlorate reduction was significantly inhibited and perchlorate reduction rate was average 28.4% in a fixed biofilm reactor. Perchlorate and nitrate were reduced simultaneously in the presence of perchlorate(1mg/L ClO4-) and nitrate(66.4mg/L NO3-) even at 1.5% NaCl in a fixed biofilm reactor. Although perchlorate could not be measured by IC due to the interference of high salinity at 3% NaCl, nitrate reduction was inhibited and nitrate reduction rate was average 53.9% at 3% NaCl in a fixed biofilm reactor.
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