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Study on the Treatment for Landfill Leachate by Chemical Precipitation/Fenton Process

Wenhui Liu

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Abstract

The chemical reaction is carried on as magnesia and phosphorylation meets NH3N in the leachate under alkaline conditions,in which the sediment of MgNH4PO4·6H2O is produced and the leachate is pre-treated.The result shows that the removal rate of NH3-N and COD can reach 76.7% and 40.7% respectively under conditions,pH=9.5 and drug addition ratio NH4+∶Mg2+∶PO43-=1∶1.3∶1.Pretreatment effluent is oxidized by Fenton reagent and the result shows that the removal rate of COD can reach as high as 93.81% with conditions,pH=3,210 mins of oxidation time,the dosage of FeSO4·7H2O 0.04 mol,and the addition ratio of H2O2/FeSO4·7H2O 4∶1.

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What this paper is about

The chemical reaction is carried on as magnesia and phosphorylation meets NH3N in the leachate under alkaline conditions,in which the sediment of MgNH4PO4·6H2O is produced and the leachate is pre-treated.The result shows that the removal rate of NH3-N and COD can reach 76.7% and 40.7% respectively under conditions,pH=9.5 and drug addition ratio NH4+∶Mg2+∶PO43-=1∶1.3∶1.Pretreatment effluent is oxidized by Fenton reagent and the result shows that the removal rate of COD can reach as high as 93.81% with conditions,pH=3,210 mins of oxidation time,the dosage of FeSO4·7H2O 0.04 mol,and the addition ratio of H2O2/FeSO4·7H2O 4∶1.

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Available abstract

The chemical reaction is carried on as magnesia and phosphorylation meets NH3N in the leachate under alkaline conditions,in which the sediment of MgNH4PO4·6H2O is produced and the leachate is pre-treated.The result shows that the removal rate of NH3-N and COD can reach 76.7% and 40.7% respectively under conditions,pH=9.5 and drug addition ratio NH4+∶Mg2+∶PO43-=1∶1.3∶1.Pretreatment effluent is oxidized by Fenton reagent and the result shows that the removal rate of COD can reach as high as 93.81% with conditions,pH=3,210 mins of oxidation time,the dosage of FeSO4·7H2O 0.04 mol,and the addition ratio of H2O2/FeSO4·7H2O 4∶1.

Key concepts: Leachate, Effluent, Chemistry, Fenton's reagent, Reagent, Precipitation, Chemical oxygen demand, Environmental chemistry

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