| Title |
Simultaneous removal of nitrogen and phosphorus in high strength wastewater using MAP precipitation |
| Authors |
이상민(Sang Min Lee),신항식(Hang Sik Shin),남세용(Se Yong Nam) |
| Abstract |
The MAP precipitation was studied as a way of removing simultaneously ammonia nitrogen and phosphorus using various magnesium sources. The operational parameters of pH, mixing time, and the magnesium molar ratio were investigated to find optimal conditions of the MAP precipitation using synthetic wastewater. The removal efficiency of ammonia and phosphorus increased with pH up to 10.5. By MAP precipitating of the synthetic wastewater, 83% of the ammonia nitrogen and 97% of the phosphorus were eliminated at pH 10.5. It was found that at least 10 minutes` mixing time was required and 20 minutes` mixing time was recommended for efficient ammonia and phosphorus removal. High efficiency removal of ammonia nitrogen was possible when the magnesium molar ratio was 1.0-2.0. The comparative study of different magnesium sources showed that bittern was the more efficient coagulant than sea water or magnesium salt. The result showed that 72% of ammonia nitrogen and 98% of phosphorus, respectively, were removed when bittern was used for the MAP precipitation of coke wastewater. |