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

Molecules

Zaixing Li¹  Xuguang Ren¹  Jiane Zuo¹  Yanfang Liu¹  Erhong Duan¹  Jingliang Yang¹  Ping Chen¹ 

[1] ¹School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China ²Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China ³North China Pharmaceutical Company, Shijiazhuang 050015, China

关键词: struvite;    7-aminocephalosporanic acid;    wastewater;    ammonia nitrogen;    precipitation;   

DOI  :  10.3390/molecules17022126

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.