Struvite precipitation for ammonia nitrogen removal in 7-aminocephalosporanic acid wastewater.

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Zaixing LiYongjun Wang

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:PO₄ ³⁻-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 PO₄ ³⁻-P in the effluent. MgCl₂·6H₂O + 85% H₃PO₄ was the most efficient combination for NH₄⁺-N removal. Furthermore, the lowest concentration of the residual PO₄ ³⁻-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.

References

Jan 17, 2002·Water Research·I StratfulJ N Lester
Jun 5, 2002·Water Research·Y JafferS A Parsons
Oct 31, 2002·Water Research·James D Doyle, Simon A Parsons
Jan 30, 2007·Water Research·Mariska RonteltapWilli Gujer
Jan 22, 2008·Journal of Hazardous Materials·Hong-Duck RyuSang-Ill Lee
Jul 5, 2008·Bioresource Technology·Daekeun KimSang-Ill Lee

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