Original scientific paper
https://doi.org/10.5599/jese.2013.0034
Electrochemical treatment of leachates from sanitary landfills
Annabel Fernandes
; UMTP and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal
Edite Catalao
; UMTP and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal
Lurdes Ciriaco
; UMTP and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal
Maria J. Pacheco
; UMTP and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal
Ana Lopes
; UMTP and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal
Abstract
The electrochemical treatment of leachate samples from a Portuguese intermunicipal sanitary landfill was carried out using anodic oxidation. The treatment was performed in a pilot plant that possesses an electrochemical cell, with boron-doped diamond electrodes, working in batch mode with recirculation. The influence of the applied current density and the flow rate on the performance of the electrochemical oxidation was investigated. Current density was decreased by steps, during the degradation, in order to study this effect on the efficiency of the process. For the assays run at equal flow rate and initial current intensity, chemical oxygen demand (COD) removal seems to depend mainly on the charge passed and the variation of the current density during the anodic oxidation process can reduce the energetic costs. An increase in the recirculation flow rate leads to an increase in the organic load removal rate and a consequent decrease in the energetic costs, but it decreases the nitrogen removal rate. Also, the bias between dissolved organic carbon and COD removals increases with flow rate, indicating that an increase in recirculation flow rate decreases the mineralization index.
Keywords
Landfill leachate treatment; BDD; anodic oxidation
Hrčak ID:
110238
URI
Publication date:
1.6.2013.
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