The Removal of High NH3-N Concentration in Landfill Leachate by Chemical Precipitation

Wei Hua Song; Jun Yin; Yu Wang

doi:10.4028/www.scientific.net/AMR.281.305

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 281The Removal of High NH3-N Concentration in...

The Removal of High NH3-N Concentration in Landfill Leachate by Chemical Precipitation

Abstract:

The municipal landfill leachate concentration was 1670mg / L, NH3-N in leachate was fomed MgNH₄PO₄· 6H₂O crystal precipitation by adding MgSO₄ · 7H₂O and Na₂HPO4 · 12H₂O. pH value, reaction timeand chemical dosage ratio was discussed. The results shows that the suitable reaction pH value is between 8 and 9.When PH value is too high, the crystal structure would bedest- ructed,it will make the fixed ammonia escaped from MgNH₄PO₄. Mg²⁺: NH₄ ⁺: PO₄^3-= 1.4:1:1.4 is the best choise under the conditions of pH 8.5, reaction time =20 min.The concentration of NH3-N in leachate was decreased from 1671Mg / L to 175Mg / L,the removal rate reaches to 98.5%.

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Periodical:

Advanced Materials Research (Volume 281)

Pages:

305-308

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.281.305

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Online since:

July 2011

Authors:

Wei Hua Song, Jun Yin, Yu Wang

Keywords:

Crystallization, High Concentration of Ammonia Nitrogen in Landfill Leachate, Map, Removal Rate of Ammonia

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