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DOI: https://doi.org/10.4491/eer.2018.014
A new approach for detoxification of landfill leachate using Trametes trogii
Yosr Smaoui1, Mariem Fersi2, Tahar Mechichi3, Sami Sayadi4, and Jalel Bouzid1
1Laboratoire Génie de l’Environnement et Eco technologie, Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, PB 1173, 3038, Sfax, Tunisia
2Unité de Biotechnologie des Algues, Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, BP 1173, 3038, Sfax, Tunisia
3Laboratoire de Génie enzymatique et Microbiologie, Ecole Nationale d’Ingénieurs de Sfax, Université de Sfax, BP 1173, 3038, Sfax, Tunisia
4Laboratoire des Bioprocédés Environnementaux, LMI Cosys-Med, Centre de Biotechnologie de Sfax, BP 1177, 3018, Sfax, Tunisia
Corresponding Author: Yosr Smaoui ,Tel: +216-58-532-310, Fax: +216-74-665-190, Email: smaoui_yosr@yahoo.fr
Received: May 21, 2018;  Accepted: July 12, 2018.
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ABSTRACT
Landfill leachate constitutes one of the most polluting wastewaters. Their treatment was considered difficult due to the presence of high concentration of organic matter, ammonia, toxic organic compounds and heavy metals. Biological processes were found to be effective in several cases, but they are limited by the presence of inhibitory compounds in leachate. In this study we develop a biological process for the leachate biodetoxification using Trametes trogii (T. trogii; CLBE55). Results show that laccase activity, mycelia growth and chemical oxygen demand (COD) removal efficiencies varied depending on the leachate and ammonium concentration. Indeed T. trogii was able to grow in the presence of low concentration of landfill leachate of 10 and 30%. In fact, the biomass produced was 4.7 and 3.7 g/L, respectively leading to a COD removal of 66 and 53%, respectively. However, when the concentration of the introduced leachate exceeds 30%, the treatment efficiency and particularly the COD removal decreases to reach 15% at 100% leachate. The effect of the ammonia was also studied and results showed that the addition of 5 g/L of ammonia inhibited totally the production of laccase and the COD removal
Keywords: Ammonia | Biomass | COD removal | Laccase activity | Landfill leachate | Trametes trogii
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