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Landfill leachate treatment by sequential membrane bioreactor and electro-oxidation processes.

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Zolfaghari, Mehdi; Jardak, Karama; Drogui, Patrick; Brar, Satinder Kaur; Buelna, Gerardo; Dubé, Rino (2016). Landfill leachate treatment by sequential membrane bioreactor and electro-oxidation processes. Journal of Environmental Management , vol. 184 . p. 318-326. DOI: 10.1016/j.jenvman.2016.10.010.

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Résumé

Combination of high performance membrane bioreactor (MBR) equipped with ultrafiltration and electro-oxidation process (EOP) by boron-doped diamond electrode (BDD) was used to effectively treat highly contaminated old landfill leachate. MBR and EOP were optimized for raw and pretreated landfill leachate. Seasonal changes dramatically affected the both processes' performance, as the landfill leachate was ¾ more concentrated in winter. For MBR, organic load rate of 1.2 gCOD/L/day and sludge retention time of 80 days was considered as the optimum operating condition in which COD, TOC, NH₄⁺ and phosphorous removal efficiencies reached the average of 63, 35, 98 and 52%, respectively. The best performance of EOP was in current intensity of 3 A with treatment of time of 120 min. Effluent of electro-oxidation was more toxic due to the presence of radicals and organochlorinated compounds. These compounds were removed by stripping or assimilation of sludge if EOP was used as a pretreatment method. Furthermore, the energy consumption of EOP was decreased from 22 to 16 KWh/m³ for biologically treated and raw landfill leachate, respectively.

Type de document: Article
Mots-clés libres: landfill leachate; membrane bioreactor; electro-oxidation process; energy consumption; removal efficiency; Di 2-ethyl hexyl phthalate
Centre: Centre Eau Terre Environnement
Date de dépôt: 16 févr. 2018 22:22
Dernière modification: 16 févr. 2018 22:22
URI: http://espace.inrs.ca/id/eprint/5162

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