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Struvite Precipitation for Ammonia Nitrogen Removal in 7-Aminocephalosporanic Acid Wastewater
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
North China Pharmaceutical Company, Shijiazhuang 050015, China
* Authors to whom correspondence should be addressed.
Received: 4 January 2012; in revised form: 14 February 2012 / Accepted: 15 February 2012 / Published: 21 February 2012
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
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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.
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(2):2126-2139.
Li, Zaixing; Ren, Xuguang; Zuo, Jiane; Liu, Yanfang; Duan, Erhong; Yang, Jingliang; Chen, Ping; Wang, Yongjun. 2012. "Struvite Precipitation for Ammonia Nitrogen Removal in 7-Aminocephalosporanic Acid Wastewater." Molecules 17, no. 2: 2126-2139.