Secondary treatment generally involves a biological process to remove organic matter through biochemical oxidation.

通常二次处理是利用生物法的生化氧化过程来去处有机物。

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Air emission of Shanghai cigarette plant reaches secondary standard of environment air quality (GB3095-96) by using odor biological treatment facility imported from Germany.

上海卷烟厂从德国引进生物处理装置，使排放气体达到GB 3 0 95 - 96环境空气质量二级标准。

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Aiming at the poor effect of amino nitrogen degradation in conventional refinery oil sewage treatment, the secondary biochemical test was carried with biological aeration filter pool.

针对炼油厂含油废水的常规生化处理工艺对氨氮的降解效果较差，采用曝气生物滤池作为二级生化进行试验研究。

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