In the anoxic phase, without adding external carbon source, internal carbon source is used for denitrification.
在缺氧阶段，可利用内碳源实现剩余硝态氮的反硝化。
It is found that HRT, influent ammonia nitrogen and external carbon source have significant effect on biological nitrification and denitrification.
通过试验发现HRT、进水氨氮和外碳源对生物硝化和反硝化有重要影响。
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