Journal
MOLECULES
Volume 17, Issue 2, Pages 2126-2139Publisher
MDPI
DOI: 10.3390/molecules17022126
Keywords
struvite; 7-aminocephalosporanic acid; wastewater; ammonia nitrogen; precipitation
Funding
- National Technical Major Projects for Water Pollution Prevention and Control in China [2008ZX07529-006]
- Natural Science Foundation of China [21106033]
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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 center dot 6H(2)O + 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.
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