Valorization of by-products from the olive oil extraction: evolution of chemical and spectroscopic characteristics during composting

S. Mouas Bourbia, K. Kana, K. Mahmoudi, K. Amokrane, D. Louni, N. Lardjane


Abstract:Compost plays a central role in organic soil fertility. Composting is considered a viable solution for olive mill waste. The objective of this work was to study the composting of olive pomace in order to obtain reusable compost in organic farming. Four different   windrows were prepared by mixing olive pomace with different agro-industrial by-products, which were used either as building agents or as N sources. The main process parameters (temperature, pH, organic carbon) were monitored over four months to ascertain the maturity of the compost. Fonctionnel groups of compost were investigated with FT-IR spectroscopy. All windrows reached temperatures of 60°C indicating good sanitation composts The initial acidic pH of 5.53 to 6.13 reached adequate pH values of 6.6 to 8 after 120 days. The decrease in carbon content is lower than expected because high content of lignin in initial compounds. IF spectra windrows presented strong similarities. The massif around 3440 cm -1 and pic of 2924 cm-1disappears after 120 days. It would be a degradation of holocellulose.

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