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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

1,2
, 1
, 2
, 1
, 1,* , 1,* , 3
 and 3
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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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