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DOI: https://doi.org/doi.org/10.4491/eer.2018.341
Assessment of organic matter biodegradation and physico-chemical parameters variation during co-composting of lignocellulosic wastes with Trametes trogii inoculation
Mariem Fersi1, Khadija Mbarki2, Kamel Gargouri3, Tahar Mechichi4, and Ridha Hachicha1
1Algae Biotechnology Unit (UBA), National Engineering School of Sfax (ENIS), Biological Engineering department, Sfax University PB 1173, 3038 Sfax, Tunisia
2Environmental Engineering and Eco Technology Laboratory, National Engineering School of Sfax (ENIS), Geological Engineering department, Sfax University PB 1173, 3038 Sfax, Tunisia
3Laboratory of olive and fruit trees productivity improvement, olive institute, PB 1087, 3000 Sfax, Tunisia
4Laboratory of Enzymatic Engineering and Microbiology (LGEM), National Engineering School of Sfax (ENIS), Biological Engineering department, Sfax University PB 1173, 3038 Sfax, Tunisia
Corresponding Author: Mariem Fersi ,Tel: +216-21303642, Email: m.fersi87@gmail.com
Received: September 27, 2018;  Accepted: January 11, 2019.
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ABSTRACT
Lignin complexity molecule makes its biodegradation difficult during lignocellulosic wastes composting. So, the improvement of its biodegradation has usually been considered as an objective. This study aimed to determine the impact of Trametes trogii inoculation on organic matter and particularly on lignin and cellulose during green wastes co-composting with olive mill waste water sludge and coffee grounds. Three types of heaps (H1, H2 and H3) were investigated during 180 d. H3 and H2 were inoculated at the beginning of the process (t0) and 120 d later (t120), respectively while H1 was the control. Results showed the absence of pH stabilization in H3 during the first month. Also, in this period we observed a faster degradation of some easily available organic matter in H3 than in the other heaps. After 120 d, a better cellulose decomposition (25.28%) was noticed in H3 than in H1 and H2 (16%). Inoculation during the second fermentation phase induced supplementary lignin degradation in H2 with a percentage of 35% against 23 and 26% for H1 and H3, respectively. For all the runs, a Fourier Transform Infrared analysis showed aliphatic groups’ decrease, OH groups’ increase and lignin structural modification.
Keywords: Composting | Lignin degradation | Lignocellulosic wastes | Organic matter | T. Trogii
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