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2007•Journal of Shaanxi Normal UniversityRequires access

Study on landfill leachate pre-treated by Fenton oxidation

Hong Wei

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Abstract

The treatment of landfill leachate by Fenton process was investigated. Experiments were conducted in a batch reactor to examine the effects of operating factors including pH,hydrogen peroxide concentration and ferrous ion concentration on chemical oxygen demand(COD) of treated leachate.The optimal reacting conditions were experimentally found to be =4 mmol/L,[H_2O_2]/=16 and pH=3 at room temperature.Under these conditions,the initial COD of the leachate was reduced by about 40% within 4 h.The bioavailability of the leachate was improved after Fenton oxidation,as indicated by its BOD_5 /COD ratio to be larger than 0.5.In addition,Fenton oxidation used in this process conforms to two-stage the pseudo-first-order kinetic model.

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What this paper is about

The treatment of landfill leachate by Fenton process was investigated. Experiments were conducted in a batch reactor to examine the effects of operating factors including pH,hydrogen peroxide concentration and ferrous ion concentration on chemical oxygen demand(COD) of treated leachate.The optimal reacting conditions were experimentally found to be =4 mmol/L,[H_2O_2]/=16 and pH=3 at room temperature.Under these conditions,the initial COD of the leachate was reduced by about 40% within 4 h.The bioavailability of the leachate was improved after Fenton oxidation,as indicated by its BOD_5 /COD ratio to be larger than 0.5.In addition,Fenton oxidation used in this process conforms to two-stage the pseudo-first-order kinetic model.

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Available abstract

The treatment of landfill leachate by Fenton process was investigated. Experiments were conducted in a batch reactor to examine the effects of operating factors including pH,hydrogen peroxide concentration and ferrous ion concentration on chemical oxygen demand(COD) of treated leachate.The optimal reacting conditions were experimentally found to be =4 mmol/L,[H_2O_2]/=16 and pH=3 at room temperature.Under these conditions,the initial COD of the leachate was reduced by about 40% within 4 h.The bioavailability of the leachate was improved after Fenton oxidation,as indicated by its BOD_5 /COD ratio to be larger than 0.5.In addition,Fenton oxidation used in this process conforms to two-stage the pseudo-first-order kinetic model.

Key concepts: Leachate, Hydrogen peroxide, Chemical oxygen demand, Ferrous, Chemistry, Batch reactor, Environmental chemistry, Oxidation process

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