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。

youdao

The U.N.Deputy Resident and Humanitarian Coordinator in Juba,South Sudan,Lise Grande, says the number of internal conflicts in the semi-autonomous region has risen from last year's levels.

VOA: standard.2010.03.23

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