Assessment of denitrification by the ordinary heterotrophic organisms in an NDBEPR activated sludge sytem

反硝化细菌 反硝化 缺氧水域 亚硝酸盐 硝酸盐 活性污泥 异养 细菌 好氧反硝化 环境化学 化学 硝化作用 自养 废水 曝气 微生物 微生物种群生物学 环境科学 污水处理 氮气 制浆造纸工业 环境工程 生物 有机化学 遗传学
作者
GD Drysdale,H. C. Kasan,Faizal Bux
出处
期刊:Water Science and Technology [Pergamon Press]
卷期号:43 (1): 147-154 被引量:42
标识
DOI:10.2166/wst.2001.0036
摘要

The purpose of this study was to isolate and characterise the ordinary heterotrophic organisms (OHOs) present in a NDBEPR system in order to gain a better understanding of the organisms involved in denitrification as well as a more holistic and accurate evaluation of the OHO fraction attributable to denitrification in such a system. Heterotrophic bacteria were isolated from the pre- and secondary anoxic zones of the Darvill NDBEPR process and characterised according to their ability to reduce nitrates and/or nitrites under anoxic conditions. Results showed that the OHO fraction is more complex than currently accepted and, with respect to denitrification, can be more accurately subdivided into five functional groups, four of which interactively contribute to denitrification occurring in the system and one group that are non-denitrifying. These groups were defined as true denitrifiers (bacteria capable of both nitrate and nitrite reduction), incomplete denitrifiers (bacteria that reduced nitrates to nitrites with no further reduction of the nitrites produced), incomplete-nitrite reducers (bacteria capable of both nitrate and nitrite reduction, however, exhibiting severe inhibition of nitrite reduction by nitrates), exclusive nitrite reducers (bacteria only capable of reducing nitrites) and non-denitrifiers (bacteria not capable of nitrate or nitrite reduction).
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