摘要
磷酸镁铵是一种难溶于水的白色晶体,通过形成磷酸镁铵沉淀可实现对废水中氮磷的去除和回收利用,沉淀可作为一种缓释肥。对磷酸镁铵的形成机理、影响因素作了较系统的综述,认为磷酸镁铵在废水中产生沉淀的倾向与平衡时的化学势(μ∞)和过饱和时的化学势(μs)之差(Δμ),过饱和度,废水中的镁离子、铵离子、磷酸根离子比例,水质特征及pH有关,且沉淀的完全程度还与沉淀时间密切相关,其中pH对沉淀影响最为显著。
Magnesium ammonium phosphate（MAP） is a white inorganic crystalline which is insoluble in water. By means of MAP formation,nitrogen and phosphorus in the wastewater can be removed and reused and MAP can be used as relaxed - release fertilizer. The mechanism of MAP formation and its influenced factors are reviewed. MAP precipitation has relation with the difference volume of chemical potential between supersatuation and balance state , the ratio of Mg^2＋ , NH^4＋ , PO4^3- ,pH and the character of the wastewater in the system,the influence of pH is the most prominent. In addition,reaction time has great effect to the degree of precipitation.
出处
《无机盐工业》
CAS
北大核心
2007年第1期44-46,共3页
Inorganic Chemicals Industry
基金
重庆市科委攻关项目(CSTC
2004AD7027)
关键词
磷酸镁铵
脱氮除磷
化学势
magnesium ammonium phosphate
ammonium and phosphate removal
chemical potential
