Karthikeyan, O.P., and Joseph, K. (2008) Chemical precipitation of ammonia-N as struvite from landfill leachate effect of molar ratio upon recovery. Journal of Solid Waste Technology and Management, 34 (1). pp. 20-26.

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Abstract

Struvite precipitation has the potential for removing ammonia-N from landfill leachate. A laboratory scale study was performed to investigate the recovery of NH4 +-N as struvite using MgCl2.6H2O and Na2HPO4 as Mg and P sources, respectively. Seven different molar ratios (Magnesium: Ammonium: Phosphate) were used to optimize the removal efficiency of ammonia-N, Around 58 of ammonia removal was obtained in 1:11 molar ratio. Maximum removal efficiency of 76 and 78 achieved at the molar ratio of 2:11.5 and 1.51:2, respectively. Leachate pH varied from 6.5 to 6.9 in supernatant samples obtained from different molar ratio. Leachate COD increased (from 3,461 mg/L to 10,481 mg/L) and TOC decreased (from 2,448 mg/L to 1,825 mg/L) with ammonia removal in leachate. Leachate quality in terms of calcium, potassium, nitrate, nitrite and phosphates were unaffected by the struvite precipitation.

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