https://doi.org/10.15255/KUI.2020.075
Published: Kem. Ind. 70 (11-12) (2021) 627–638
Paper reference number: KUI-75/2020
Paper type: Original scientific paper
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Treatment of Leachate from the Technical Landfill Centre Aïn Defla (Algeria) by Oxidation and Biosorption Process

B. Feraoun, A. E. Belhadj, K. Otmanine and M. Hammoudi

Abstract

The aim of this study was the treatment of leachate from the Technical Landfill Centre Aïn Defla in Algeria, which presents a serious threat to the environment. Elimination of organic matter (expressed as chemical oxygen demand (COD) and biological oxygen demand (BOD₅)), suspended matter (SM), mineral matter (phosphates and ammoniacal nitrogen), and heavy metals (zinc and iron) were experimentally studied using the coupling of oxidation (OP) and biosorption processes (BS). The analysis results showed that the leachate studied at pH 8.8 was very loaded in organic matter (turbidity of 553 NTU, SM = 820 mg l^–1, COD = 9669 mg O₂ l^–1, and BOD₅ = 8875 mg O₂ l^–1), in salts (EC = 19.4 mS cm^–1), in ammoniacal nitrogen (2027 mg l^–1), in phosphates (22.9 mg l^–1), and in sulphates (750 mg l^–1). It also contained significant amounts of heavy metals, notably zinc (4.21 mg l^–1) and iron (47.5 mg l^–1). The evolution of the physicochemical parameters during the treatment showed that, under the optimal conditions (T = 45 °C, [H₂O₂] = 1.6 mol l^–1, volume fraction φ(H₂O₂) = 5 %, and [Fe³⁺] = 0.5 mmol l^–1), the reduction in COD was about 99 %, the reduction in BOD₅ was 100 %, the elimination of colloidal particles (SM) could reach 95 %, reduction in phosphates was 78 %, reduction in ammonium was 98 %, reduction in sulphates was 96 %, reduction in zinc was 92 %, and the reduction in iron was 98 %.

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Keywords

leachate, landfill, oxidation process, biosorption