Chemical precipitation of ammonia-N as struvite from landfill leachate effect of molar ratio upon recovery

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.

Item ID: 35923
Item Type: Article (Research - C1)
ISSN: 1088-1697
Keywords: ammonia; chemical oxygen demand; leachate treatment; ph effects; removal, ammonia-n; landfill leachate; magnesium ammonium phosphate, precipitation (chemical)
Date Deposited: 30 Oct 2014 02:41
FoR Codes: 09 ENGINEERING > 0907 Environmental Engineering > 090703 Environmental Technologies @ 80%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials @ 20%
SEO Codes: 86 MANUFACTURING > 8607 Agricultural Chemicals > 860702 Chemical Fertilisers @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
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