pH值控制MAP法脱氮进程的可行性研究  

The feasibility study of controlled nitrogen removal process of MAP by pH

作　　者：曹先仲[1] 陈花果[1] 宋艳辉[1] 申松梅[1] 

机构地区：[1]长安大学环境科学与工程学院,西安710054

出　　处：《环境工程学报》2009年第3期493-496,共4页Chinese Journal of Environmental Engineering

摘　　要：MAP沉淀法处理高NH3-N废水，操作简便，处理效果好。本试验以NH3-N浓度为1000mg／L的模拟废水为研究对象，研究结果表明，在Mg^2＋：PO4^3-：NH4^＋=1．2：1．2：1（摩尔比）、NaOH投加量为6．75g／L的条件下NH3-N去除率高达98％以上。试验选择出水pH作为控制反应进程的参数，并建立了出水pH与NH3-N去除率之间的关系。通过调整NaOH投加量控制出水pH在7．5～8之间时，NH3-N去除率最高，可达98％以上。x-衍射图谱及定量分析表明，沉淀物中MAP的纯度较高，具有一定的回收价值。The method of MAP precipitation to treat high NH3-N wastewater was simple and effective. This trial used simulated wastewater of NH3-N concentration 1 000 mg/L as the research object. The results demonstrated that with the ratio of Mg^2＋ ： PO4^3- ： NH4＋ = 1.2： 1.2：1 （ molar ratio） and NaOH dosage of 6.75 g/L, the removal rate of NH3-N can reach as high as 98%. The experiment chose effluent pH as the the parameter to control the reaction process, and established the relationship between effluent pH and NH3-N removal rate. Controlled the effluent pH between 7.5 - 8 by adjusting NaOH dosage, the removal rate of NH3-N was highest and could reach 98 percent. The XRD spectra and quantitative analysis of precipitates indicated that the MAP precipitation had high purity, and had certain recovery value.

关 键 词：MAP沉淀 NH3-N废水 Mg2+∶PO43-∶NH4+ 出水pH 

分 类 号：X52[环境科学与工程—环境工程]