摘要
在实验室规模研究了通过生成鸟粪石(磷酸铵镁,MAP)去除氨氮工艺条件的影响.加入磷酸和MgO产生MAP沉淀,pH值对其影响很大,pH值为9.0时氨氮去除效果最好.PO43-,Mg2+,NH4+的摩尔比为1∶1.5∶1时,氨氮去除率较大并且可较好地回收氨生成鸟粪石.此外,物料的加入次序严重影响氨氮的去除.两步沉淀工艺氨氮去除率达99.1%,氨回收率为80.1%.
The effects of processing conditions on NH4^＋ -N （ammonia-nitrogen） removal to form struvite （ magnesium ammonium phosphate, MAP） were studied in a laboratory scale. MAP precipitation was carried out by adding phosphoric acid and MgO. The effect of pH was significant and the highest removal was obtained at pH 9.0. A PO4^3-： Mg^2＋： NH4^＋ molar ratio of 1 ： 1.5 ： 1 was found to be beneficial for the higher removal of NH4^＋ -N and the higher recovery of ammonia to form struvite. In addition, the feed-in sequence of material significantly affects NH4^＋ -N removal. It was shown that a highest NH4^＋ -N removal of 99.1% and an ammonia recovery of 80.1% could be obtained by a two-step precipitation process.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2006年第2期295-298,共4页
Journal of Jilin University:Science Edition
基金
国家"十五"科技攻关重点项目基金(批准号:2004BA313B-17)
关键词
氨氮废水
鸟粪石
磷酸氨镁
废水处理
回用
化肥厂
ammonia-nitrogen wastewater
struvite
magnesium ammonium phosphate
wastewater treatment
recovery
fertilizer
