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作 者 ：万曦1;万国江2;黄荣贵2;M.Snozzi3

期 刊 ：植物营养与肥料学报 2000年 6卷 2期 页码：227-232

关键词：混合微生物；脱氮作用；pH变化；好氧与厌氧转换；

Keywords:microorganisms denitrification, pH, transition between oxic and anoxic conditions,

摘 要 ：开展了 pH及好氧 厌氧转换对微生物脱氮作用影响的研究 ,结果表明 ,在 pH≥7.5时 ,经过 3次好氧与厌氧条件转换后 ,混合微生物的脱氮作用能顺利进行 ,N₂产量持续稳定 ,NO₂^- 、N₂O和NO产量很少 ;在 pH =6.8时 ,中间产物NO₂^- 、N₂O等大量出现 ,脱氮菌的细胞干重急速下降并被洗出 ,脱氮能力受到抑制

Abstract:With rapidly industrial and agricultural development, more and more fertilizers, chemicals and heavy ions etc. flow into lakes and rivers without cleaning, which causes lake eutrophication, decreasing quality in drinking water sources. Therefore, denitrification is essential for controlling the amounts of nitrogen. During the process from nitrate to the end products—nitrogen, several intermediates, e.g. nitrite (NO₂^-), nitrous oxid(N₂O) and nitric oxid(NO) may be accumulated which have more toxic influences on environment. In this study, denitrification effect of microorganisms was examined on the changes between oxic and anoxic conditions under varying pH. At pH 7.5, denitrification proceeded well after 3 switches from oxic to anoxic condition and vice versa. Production of N₂ was constant and amounts of NO₂^-, N₂O and NO were little. However, at pH 6.8, the denitrification activity was inhibited and there were a large amounts of intermediates. Dry weight of denitrifying bacteria decreased violently and washed out.

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