Optimization of process parameters for mature landfill leachate pretreatment using MAP precipitation

doi:10.1007/s11783-012-0440-9

Front Envir Sci Eng

2012, Vol. 6

Issue (6) : 892-900 https://doi.org/10.1007/s11783-012-0440-9

RESEARCH ARTICLE

Optimization of process parameters for mature landfill leachate pretreatment using MAP precipitation

Wei LI(

), Xiaowen DING, Min LIU, Yuewen GUO, Lei LIU

Key Laboratory of Regional Energy Systems Optimization (Ministry of Education), S-C Energy and Environmental Research Academy, North China Electric Power University, Beijing 102206, China

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Abstract

Chemical precipitation is a useful technology as a pretreatment to treat mature landfill leachate with high concentrations of ammonium-nitrogen (NH4+-N) and refractory organic compounds. Orthogonal experiments and factorial experiments were carried out to determine the optimal conditions enhancing the magnesium ammonium phosphate (MAP) precipitation process, and the experimental results demonstrated that the removal rate of NH4+-N was more than 85% when MgO and NaH₂PO₄·2H₂O were applied as external sources of magnesium and phosphorous under the optimal conditions that molar ratio n(Mg)∶n(N)∶n(P) = 1.4∶1∶0.8, reaction time 60 min, original pH of leachate and settling time 30 min. In the precipitation process, pH could be maintained at the optimal range of 8–9.5 because MgO could release hydroxide ions to consume hydrogen ions. Calcium ions and carbonate ions existed in the leachate could affect the precipitation process, which resulted in the decrease of NH4+-N removal efficiency. The residues of MAP sediments decomposed by heating under alkaline conditions can be reused as the sources of phosphorous and magnesium for the removal of high concentrations of NH4+-N, and up to 90% of ammonium could be released under molar ratio of n[OH]∶n[MAP] = 2.5∶1, heating temperature 90°C and heating time 2h.

Keywords magnesium ammonium phosphate precipitation mature landfill leachate optimization ammonium-nitrogen

Corresponding Author(s): LI Wei,Email:weili819@yahoo.com.cn

Issue Date: 01 December 2012

Cite this article:

Wei LI,Xiaowen DING,Min LIU, et al. Optimization of process parameters for mature landfill leachate pretreatment using MAP precipitation[J]. Front Envir Sci Eng, 2012, 6(6): 892-900.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0440-9
https://academic.hep.com.cn/fese/EN/Y2012/V6/I6/892

Tab.1 Factors levels of orthogonal experiments

Fig.1 Impacts of various factors on the removal rate

Fig.2 removal rate and residual concentrations of and under different molar ratios of n(Mg)∶n(N)

Fig.3 removal rate and weight of sediments under different molar ratios of n(Mg)∶n(N)

Fig.4 removal rate and residual concentration under different pH values

Fig.5 Ratio of free ammonia (FA) under different pH values in 30°C

Fig.6 removal rate and residual concentration under different ratios of n(P)∶n(N)

Fig.7 removal rate and pH under different reaction time

Fig.8 Comparisons of removal rate and sediments weight between synthetic water and landfill leachate

Fig.9 release rate under different molar ratios of n[OH]∶n[MAP]

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