收稿日期: 2010-02-26
网络出版日期: 2019-06-03
Study on the treatment of wastewater with highly concentrated ammonia-nitrogen by chemical precipitation
Received date: 2010-02-26
Online published: 2019-06-03
以MgCl2·6H2O和Na2HPO4·12H2O为反应沉淀剂,采用单因素试验及正交试验研究了MgNH4PO4·6H2O(MAP)化学沉淀法去除模拟废水中氨氮的工艺条件。结果表明:在pH9.0~10.5时水溶液中溶解态的磷主要以HPO42-的形式存在,并与Mg2+和NH4+一起发生沉淀反应去除废水中的氨氮;pH对高浓度氨氮废水中氨氮的去除及磷的残余的影响最大,其次是n(P):n(N),而n(Mg):n(N)和初始氨氮浓度的影响较小,优化的工艺条件为pH=9.5,n(Mg):n(N):n(P)=1.2:1:0.9,25℃下反应20min,静置30min。该工艺条件下,对初始氨氮为3880mg/L的锆铪分离中试车间的废水进行处理,其氨氮的去除率>95%,磷的残留约1.1mg/L。
徐志高, 黄倩, 张建东, 吴延科, 张力, 王力军 . 化学沉淀法处理高浓度氨氮废水的工艺研究[J]. 工业水处理, 0 : 31 -33,34 . DOI: 10.11894/1005-829x.2010.30(6).31
Magnesium chloride and disodium hydrogen phosphate are used as precipitator in the present study. The removal of ammonia-nitrogen from the simulative wastewater by magnesium ammonium phosphate(MAP) chemical precipitation has been studied by single factor experiment and orthogonal method. The results show that the dissolved phosphorus mainly exists as HPO4 2- in aqueous solution in the range of pH 9.0-10.5, and reacts with Mg2+ and NH4 + to remove ammonia-nitrogen. The initial pH is the key factor which affects the removal of ammonia-nitrogen and the residual of phosphor mostly, and n(P)∶n(N) next. But n(Mg)∶n(N) and initial concentration of ammonianitrogen are less affected. The optimal conditions are as follows:the pH=9.5, n(Mg)∶n(N)∶n(P)=1.2∶1∶0.9, reaction temperature 25 ℃, reaction time 20 min and aging time 30 min. The wastewater from the pilot-scale workshop of zirconium and hafnium separation, whose initial ammonia-nitrogen concentration is 3 880 mg/L, is treated. Its ammonia- nitrogen removal rate is above 95%, while the residual of phosphor could be about 1.1 mg/L.
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