第二，缺氧池与厌氧池位置互换，使得反硝化菌优先获得易降解有机物作为碳源，反硝化速率得到提高；

Secondly, denitrification rate is improved because the oxygen pool is before the anaerobic pool and the anaerobic denitrifying bacteria readily biodegradable COD as carbon source;

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第二，缺氧池与厌氧池位置互换，使得反硝化菌优先获得易降解有机物作为碳源，反硝化速率得到提高；

Secondly, denitrification rate is improved because the oxygen pool is before the anaerobic pool and the anaerobic denitrifying bacteria readily biodegradable COD as carbon source;

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