Abstract
The paper discusses the issue of using classic Fenton’s reagent modification for pre-treatment of leachate from a landfill in Janczyce (Świętokrzyskie Voivodeship, Poland) – sodium percarbonate (2Na2CO3·3H2O2) was used as an alternative source of hydrogen peroxide, and hydrated iron sulphate ((II) FeSO4·7H2O) was the source of iron ions. The tests were carried out at initial process pH = 3, for different doses of the Fe2+ catalyst (ranging within 100÷5400 mgFe/L), and for mass ratio iron (II) to sodium percarbonate – 1:3. Three doses were selected after this stage, for which the following parameters were examined: the effect of initial process pH ranging between 2 and 4, the effect of oxidation process duration (30÷150 min.), and the effect of the ratio Fe2+ to sodium percarbonate (1:3, 1:5 and 1:7). The values of selected parameters (pH, COD, TOC) in leachates, both before and after the treatment process have been determined according to applicable standards. Completed tests have proven, inter alia, that the proposed implementation of the Fenton’s method with sodium percarbonate may be an effective alternative for hydrogen peroxide as an oxidiser; with an increasing dose of the 2Na2CO3.3H2O2, the improvement in landfill leachate remediation efficiency measured by decreasing TOC and COD values reaches certain extent only; the process modified with sodium percarbonate may be effective already at pH=4.
Highlights
Waste production is an inevitable consequence of the functioning of a society; it is important to reduce the volume and rational management of already generated wastes
Concentrated landfill leachates generated in this way require specialist treatment, and when choosing treatment technology, one should take into account i.a. changing chemical constitution of leachate, its volume, and capital intensity of the method
Completed studies have proven that the employed implementation of Fenton’s method with sodium percarbonate may be an effective alternative for hydrogen peroxide as an oxidiser
Summary
Waste production is an inevitable consequence of the functioning of a society; it is important to reduce the volume and rational management of already generated wastes. Landfill leachates consist of rainwater flowing through landfill pit, and of all substances and ingredients washed out from wastes, and products of biochemical reactions taking place in wastes kept in a landfill. They are generated while landfill is in service, and after its closing, during its reclamation. Fenton’s process advantages include relatively low process execution costs compared to other AOP processes. This method does not require using any specialised equipment, e.g. UV lamp or ozone generators. The aim of the study was to develop an effective modification of the Fenton process with the use of sodium percarbonate for pre-treatment of landfill leachate
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