Study on the treatment of wastewater with highly concentrated ammonia-nitrogen by chemical precipitation
Received date: 2010-02-26
Online published: 2019-06-03
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.
Xu Zhigao, Huang Qian, Zhang Jiandong, Wu Yanke, Zhang Li, Wang Lijun . Study on the treatment of wastewater with highly concentrated ammonia-nitrogen by chemical precipitation[J]. Industrial Water Treatment, 0 : 31 -33,34 . DOI: 10.11894/1005-829x.2010.30(6).31
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