摘要
采用化学沉淀剂氯化镁和磷酸氢二钠,研究不同药剂加入量对焦化废水中氨氮去除率影响的一般规律。研究结果表明,采用化学沉淀法处理焦化废水中的氨氮,向废水中加入镁盐和磷酸盐,使它们反应,生成磷酸铵镁沉淀,可获得较高的氨氮去除率;处理焦化废水过程中剩余的磷酸铵镁沉淀物,是一种很有价值的缓释肥;化学法处理工艺流程简单,易于与其它处理方法结合,实施工业化。合适的工艺条件为:反应温度30℃;加料次序为先加镁盐,后加磷酸盐;m(Mg2+)∶m(NH4+)∶m(PO43-)=1.3∶1∶1时,可达到较好的氨氮去除效果,而且可使废水pH由碱性变为中性,有利于废水的进一步处理。
The removal of ammonium-nitrogen from coking wastewater by chemical precipitation method is studied.The results show that by adding precipitant magnesium chloride and sodium hydrogen phosphate into the wastewater to form magnesium ammonium phosphate,high removal rate of ammonium-nitrogen can be reached and also the magesium ammonium phosphate is a valuable release fertilizer.This chemical treatment method is simple and easy to combine with other treating method and put into industrial production.The suitable process conditions:reaction temperature 30 ℃,the adding sequence:magnesium chloride at first,then sodium hydrogen phosphate,Mg^(2+)∶(NH_4)^+∶(PO_4)^(3-)(mass ratio)=1.3∶1∶1.
出处
《无机盐工业》
CAS
2004年第6期52-53,共2页
Inorganic Chemicals Industry
关键词
焦化废水
氨氮
磷酸铵镁
coking wastewater
ammonium-nitrogen
magnesium ammonium phosphate
