Sử dụng kỹ thuật gián đoạn trong công nghệ xử lý nước rác

Abstract

Landfill leachate with low COD/N ratio was treated by sequence batch technology to remove nitrogen compounds. In a single reactor the aerobic and anoxic treatments were carried out in series with different cyclic times, namely aerobic/anoxic = 2 : 1 and 3 : 1 in the whole reaction time of eight hours. Within the aerobic cycle the DO and alkalinity were maintained highly, so that neither competition between nitrite and nitrate formation nor inhibition of nitrite formation were occuring. Experimental results pointed out, in all case the nitrite concentration was allways higher than nitrate concentration and the rate of nitrite- denitrification was not lower than that of the nitrate- denitrification process. This fact could be utilized as a “short cut process” for saving in oxygen consumption and in carbon requirement for denitrification. Journal of Chemistry, T. 42 (1), Tr. 76 - 82, 2004 Full text of the article is in Vietnamese