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Molecules 2012, 17(2), 2126-2139; doi:10.3390/molecules17022126
Article

Struvite Precipitation for Ammonia Nitrogen Removal in 7-Aminocephalosporanic Acid Wastewater

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1,* , 1,* , 3
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1 School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China 2 Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China 3 North China Pharmaceutical Company, Shijiazhuang 050015, China
* Authors to whom correspondence should be addressed.
Received: 4 January 2012 / Revised: 14 February 2012 / Accepted: 15 February 2012 / Published: 21 February 2012
(This article belongs to the Section Medicinal Chemistry)
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Abstract

7-Aminocephalosporanic acid wastewater usually contains high concentrations of ammonium (NH4+-N), which is known to inhibit nitrification during biological treatment processes. Chemical precipitation is a useful technology to remove ammonium from wastewater. In this paper, the removal of ammonium from 7-aminocephalosporanic acid wastewater was studied. The optimum pH, molar ratio, and various chemical compositions of magnesium ammonium phosphate (MAP) precipitation were investigated. The results indicated that ammonium in 7-aminocephalosporanic acid wastewater could be removed at an optimum pH of 9. The Mg2+:NH4+-N:PO43-P molar ratio was readily controlled at a ratio of 1:1:1.1 to both effectively remove ammonium and avoid creating a higher concentration of PO43-P in the effluent. MgCl2·6H2O + 85% H3PO4 was the most efficient combination for NH4+-N removal. Furthermore, the lowest concentration of the residual PO43−-P was obtained with the same combination. Struvite precipitation could be considered an effective technology for the NH4+-N removal from the 7-aminocephalosporanic acid wastewater.
Keywords: struvite; 7-aminocephalosporanic acid; wastewater; ammonia nitrogen; precipitation struvite; 7-aminocephalosporanic acid; wastewater; ammonia nitrogen; precipitation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Li, Z.; Ren, X.; Zuo, J.; Liu, Y.; Duan, E.; Yang, J.; Chen, P.; Wang, Y. Struvite Precipitation for Ammonia Nitrogen Removal in 7-Aminocephalosporanic Acid Wastewater. Molecules 2012, 17, 2126-2139.

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