Selective Inhibition of Ammonia Oxidation and Nitrite Oxidation Linked to N2O Emission with Activated Sludge and Enriched Nitrifiers
분야
자연과학 > 생물
저자
( Ali Toor Umair ) , ( Min Wook Kim ) , ( Dong Jin Kim )
발행기관
한국미생물생명공학회(구 한국산업미생물학회)
간행물정보
Journal of Microbiology and Biotechnology 2013년, 제23권 제5호, 719~723페이지(총5페이지)
파일형식
05212276.pdf [무료 PDF 뷰어 다운로드]
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    영문초록
    Nitrification in wastewater treatment emits a significant amount of nitrous oxide (N2O), which is one of the major greenhouse gases. However, the actual mechanism or metabolic pathway is still largely unknown. Selective nitrification inhibitors were used to determine the nitrification steps responsible for N2O emission with activated sludge and enriched nitrifiers. Allylthiourea (86 μM) completely inhibited ammonia oxidation and N2O emission both in activated sludge and enriched nitrifiers. Sodium azide (24 μM) selectively inhibited nitrite oxidation and it led to more N2O emission than the control experiment both in activated sludge and enriched nitrifiers. The inhibition tests showed that N2O emission was mainly related to the activity of ammonia oxidizers in aerobic condition, and the inhibition of ammonia monooxygenase completely blocked N2O emission. On the other hand, N2O emission increased significantly as the nitrogen flux from nitrite to nitrate was blocked by the selective inhibition of nitrite oxidation.
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