Process Optimization and Pilot Test of MAP Process for Removal of Landfill Leachate
We adopt the MAP precipitation method to solve the problem of high ammonia nitrogen concentration in garbage leachate.The small-scale experimental study investigated the effects of pH value,industrial phosphoric acid dosage,and precipitant molar ratio on removing ammonia nitrogen.We also conducted pilot studies and economic benefit analysis.The results showed that the optimal process conditions for the small-scale study were reaction pH=8.5,n(NH4+)∶n(H3PO4)∶n(MgCl2)=1∶1.2∶1.2,at room temperature.We achieved the ammonia nitrogen removal rate of 85.20%and effluent ammonia nitrogen concentration of 232 mg/L at the conditions.The results of the pilot study indicated that the removal efficiency of ammonia nitrogen is close to the theoretical value,and the reaction process is stable.Compared to other processing techniques,the reagent cost of this process is lower.
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