异养细菌可以吃掉未处理污水当中的大部分碳基物质；而自养细菌则会消耗掉氨氮化合物。
Heterotrophic bacteria eat most of the carbon-based materials in raw sewage while autotrophic bacteria consume ammonia and nitrogen compounds.
土壤及海洋中的细菌分解含氮化合物时，也天然地产生这种气体。
The gas is also produced naturally when bacteria in the soil and oceans break down nitrogen-containing compounds.
土壤及海洋中的细菌分解含氮化合物时，也天然地产生这种气体。
The gas is also produced naturally when bacteria in the soil and oceans break down nitrogen-containing compounds.
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