磷酸铵镁沉淀法去除NH_3-N的影响因素及应用研究  

EXPERIMENT STUDY FOR AMMONIA-NITROGEN REMOVAL FROM WASTEWATER BY MAGNESIUM AMMONIUM PHOSPHATE PRECIPITATION

作　　者：晏波[1] 胡成生[1] 朱凡[1] 韦朝海[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510640

出　　处：《环境化学》2005年第6期685-689,共5页Environmental Chemistry

基　　金：国家自然科学基金资助项目(50278036).

摘　　要：针对NH3N浓度为200—1000mg·l-1的废水,以磷酸铵镁沉淀法去除NH3N,通过正交试验确定影响磷酸铵镁沉淀反应的因素依次为:pH值,PO3-4∶NH+4,Mg2+∶NH+4和反应时间;最优反应条件分别为pH=8,Mg2+∶PO3-4∶NH+4=1.4∶1.2∶1,反应时间10min,分别考察pH值,PO34投加量,Mg2+投加量和NH3N初始浓度对磷酸铵镁沉淀法去除NH3N的效率及出水NH3N和TP浓度的影响,对养猪场废水和焦化废水中NH3N的处理,最高去除率分别达到81.01%和73.63%,同时,两种废水相应的COD和色度的最大去除率分别达到81.33%、72.97%和50.27%、20.94%.Propose a pretreatment method of magnesium ammonium phosphate （MAP） precipitation for wastewater which contains 200 to 1000mg · l^-1 ammonia-nitrogen. Principal orders of factors, which affect MAP precipitation process, concluded by otthogonal experiment are as following： pH value, P04^3-： NH4^＋, Mg^2＋ ： NH^4＋ and residence time. The optimum reaction conditions are pH 8.0, Mg^2＋ ： PO4^3- ： NH^4＋ = 1.4： 1.2：1 and t = 10min. The effects of pH, phosphate amount, magnesium ion amount and initial ammonia-nitrogen concentration on ammonia-nitrogen removal efficiency and the residual concentrations of ammonia-nitrogen and total phosphorus have been investigated respectively. Ammonia-nitrogen removing tests of swine farm wastewater and coking wastewater MAP precipitation were performed under the optimum conditions, and the best removal efficiency were 81.01% and 73.63%. At the same time, 81.33% and 72. 97% removal rate for CODcr, together with 50. 27% and 20. 94% removal rate for chromaticity color were achieved about swine farm wastewater and coking wastewater respectively. The results indicate that MAP precipitation for ammonia-nitrogen removal has a practice value.

关 键 词：磷酸铵镁 化学沉淀 脱氮. 

分 类 号：X132[环境科学与工程—环境科学]