在水中，氮是以有机氮、氨态氮、亚硝酸氮和硝酸氮的形式存在的。
In water, nitrogen exists in form of organic nitrogen, ammonia nitrogen, nitrite and nitrate.
并进一步考察了上述两种底泥对水体中有机质、氨态氮和亚硝酸盐的去除能力，探寻了利用异养硝化作用改善水质环境的潜力。
From another point of view, our study tries to find a potential of heterotrophic nitrification for the improvement of contaminated aquatic environment.
结果表明：利用曝气时间实时控制，在每个周期内氨氧化菌（AOB）降解氨氮质量大于亚硝酸盐氧化菌（NOB）降解亚硝态氮质量；AOB的净增数量大于NOB净增数目。
Analysis shows that more nitrogen is oxidized by ammonia oxidizing bacteria(AOB) than by nitrite oxidizing bacteria(NOB) with more growth of the AOB than the NOB in each cycle when using this method.
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