Reclamation of ammonia nitrogen in fertilizer plant wastewater by using precipitation-air-flotation and its mechanism

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  • School of Civil and Environmental Engineering, University of Science and Technology, Beijing 100083, China

Received date: 2005-03-31

  Online published: 2010-10-01

Abstract

The precipitation -air-flotation method is used for removal of ammonia nitrogen from fertilizer plant wastewater.It is found that using magnesium chloride and disodium hydrogen phosphate as precipitation reagent,the precipitation rate of ammonia nitrogen could be more than 95% when pH value is 10.5.The dosage of air-floating agent is an important factor which affects the recovery of air-flotation.The recovery rate of the flotation reaches more than 96% when pH is 10.5 and the dosage of dodecanoic acid is 75mg/L.The precipitates formed at different pH values are analyzed by XRD and it is found to be mainly composed of crystalline MAP (MgNH4PO4·6H2O).The adsorption mechanism between air-floating agent and MAP is chemical adsorption,which is concluded from the results of infrared spectrum analysis.

Cite this article

Cui Zhiguang, Sun Tichang, Zou Anhua, Wang Lijuan, Li Dingyi . Reclamation of ammonia nitrogen in fertilizer plant wastewater by using precipitation-air-flotation and its mechanism[J]. Industrial Water Treatment, 2005 , 25(12) : 40 -43 . DOI: 10.11894/1005-829x.2005.25(12).40

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