Abstract:
The objective of this research was to find the optimum pH and appropriate seed for Magnesium Ammonium Phosphate (MAP) precipitation from synthetic wastewater and swine wastewater. The study was divided into 2 parts. First, the effects of solution pH on weight and characteristics of the Magnesium Ammonium Phosphate precipitated were investigated with vary pH by Sodium Hydroxide. In the second part, the effects of seeds, Magnesium Ammonium Phosphate precipitated and silica sand, on Magnesium Ammonium Phosphate precipitation were studied. The results of part one showed that the optimum solution pH for precipitation was between 8-9. The efficiency of nitrogen and phosphorus removal were 83-91 and 73-87 percent for wastewater and the efficiency of nitrogen and phosphorus removal were 86-93 and 68-99 percent for wastewater with silica sand seed. The results from part two indicated that the optimum solution pH for precipitation is pH 8.5 and the optimum seeds for Magnesium Ammonium Phosphate precipitated was Magnesium Ammonium Phosphate precipitated 9 (MAP9) 1.0 gram to solution pH of pH 8.5. The efficiency of nitrogen removal was 83 percent. The results showed that the present of Magnesium Ammonium Phosphate precipitated as seed can induce precipitation but it also decreased the efficiency of nitrogen and phosphorus removal of wastewater.