ZHANGCun-kuan,DINGWen-chuan,ZENGXiao-lan,et al.Optimized Electrochemical Magnesium Ammonium Phosphate Method for Efficient Ammonia Nitrogen Removal from Landfill Leachate[J].China Water & Wastewater,2022,38(9):25-32.
Optimized Electrochemical Magnesium Ammonium Phosphate Method for Efficient Ammonia Nitrogen Removal from Landfill Leachate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第9期
Page:
25-32
Column:
Date of publication:
2022-05-01
- Keywords:
- electrochemistry; magnesium ammonium phosphate (MAP) precipitate; landfill leachate; ammonia nitrogen; pH
- Abstract:
- The optimized measures for improving ammonia nitrogen removal efficiency and product purity based on electrochemical magnesium ammonium phosphate (MAP) method were investigated to remove high ammonia nitrogen from landfill leachate. The removal efficiency of ammonia nitrogen in the electrochemical MAP reaction system decreased with the increase of initial pH. The electrochemical MAP method could generate MAP precipitate at low pH, and the MAP precipitate had the highest generation rate and high purity when the pH was between 6.5 and 8.5. The results was quite different from traditional MAP method at the optimal pH in the range of 8-10. The batch addition of KH2PO4 improved the average MAP generation rate in the whole system. When treating real landfill leachate, the electrochemical MAP method had higher ammonia nitrogen removal efficiency, lower phosphorus residual concentration and higher MAP purity than the traditional MAP method.
Last Update:
2022-05-01