MAP法去除焦化废水氨氮

Removal of Ammonium Nitrogen from Coking Wastewater by MAP Process

介绍了焦化废水中氨氮的组成和MAP法去除焦化废水氨氮的原理。研究了pH值、反应温度、反应时间、沉淀时间和r(Mg2+)∶r(NH4+)∶r(PO43-)对氨氮脱除效果的影响。结果表明,在pH为9.5、水温为25℃、反应时间为20min、沉淀时间为15min、r(Mg2+)∶(rNH4+)∶(rPO43-)为1∶1∶1时对焦化废水中的氨氮有较好的去除效果。

This paper introduces the composition of the ammonia nitrogen and the principle of removing the ammonia nitrogen from the coking wastewater by using MAP process, analyzes on the effects of pH value, the reaction temperature, the time of precipitation, and the ratio of Mg^2＋： NH4^＋ ：PO4^3- on the removal of ammonium nitrogen. The experimental results demonstrates that when the pH value is about 9.5 at the conditions of the water temperature of 25 ~C, the reaction time of 20 minutes, precipitation time of 15 minutes and the ratio of Mg^2＋, NH4^＋ and PO4^3- is controlled at 1：1：1, ammonium nitrogen is effectively removed.