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Tertiary treatment of a mixture of composting and landfill leachates using electrochemical processes.

Benguit, Alae; Tiwari, Bhagyashree; Drogui, Patrick ORCID logoORCID: https://orcid.org/0000-0002-3802-2729 et Landry, Dany (2022). Tertiary treatment of a mixture of composting and landfill leachates using electrochemical processes. Chemosphere , vol. 292 . p. 133379. DOI: 10.1016/j.chemosphere.2021.133379.

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Résumé

The study investigated the treatment efficiency of coupled electrocoagulation (EC) and electrooxidation (EO) processes for landfill leachate treatment in batch and continuous mode. The EC process (iron anode and graphite cathode) at 18.2 mA/cm2 for 2.5 min resulted in COD, turbidity, total phosphorus, total coliforms and fecal coliforms removal of 58.1, 72.9, 98.5, 97.9, and 97.2% respectively. Under the same operating conditions, the coupled EC/EO (Ti-Pt anode, bipolar iron electrode, and graphite cathode) processes showed that the COD, turbidity, total phosphorus, total coliforms, and fecal coliforms removal of 56.5%, 78.3%, 96.3%, 97.2% and fecal coliforms 72.7%, respectively. The energy costs associated with the EC and EC/EO were 0.11 and 0.25 $/m3, respectively. Compared to the batch configuration, the continuous configuration of EC resulted in similar processing performance. However, the EC/EO process resulted in the production of chlorates, perchlorates, and trihalomethanes as by-products. Moreover, the continuous process slightly increases the pH and ammonia concentration of the leachate and also resulted in the metallic sludge production with an average dryness of 4.2%. The toxicity tests determined that the treated effluent was not toxic to Rainbow trout and Daphnia.

Type de document: Article
Mots-clés libres: landfill leacheate; electro-coagulation; electro-oxidation; coupled treatment process
Centre: Centre Eau Terre Environnement
Date de dépôt: 23 juin 2022 15:00
Dernière modification: 23 juin 2022 15:00
URI: https://espace.inrs.ca/id/eprint/12662

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