The effects of mud concentration, gas to liquid ratio and the hydraulic resident time on the removal rates of COD and NH3-N were investigated.

实验考察了污泥浓度、气液比及水力停留时间对生物降解废水中COD和氨氮(NH3 - N)的影响。

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The consumption of caustic soda is mainly caused by formation of sodium hydrate aluminosilicate and it can be calculated from the ratio of N/S of red mud.

拜耳法生产氧化铝的过程中，碱耗的主要原因是因为有钠硅渣的生成，碱耗可以用赤泥钠硅比（N/S）表征。

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