Abstract
Anaerobic co-digestion of olive mill wastewater (OMW) and sewage sludge (SS) is a promising technique in terms of biogas production and quality. An OMW mixture was subjected to pre-treatment (thermal drying), which can reduce the total COD by 72.8% of 10% OMW mixture. OMW mixtures at concentrations of 2, 5, and 10% were tested. OMW addition can improve biogas production if the mixture exceeds 5% (v/v) concentration in the feed. The digestion of SS produced 31 Nm3/Kgvs and with an addition of OMW increased biogas production in the range of 0.337–0.42 Nm3/Kgvs (2–10% v/v in the feed), where the best addition was 10% with 0.42 Nm3/Kgvs of biogas. VS removal was estimated, it was over 55.2% of 10% OMW about 2.2 times of digestion of SS. Also, COD removal efficiency exceeded 72.2% of 10% OMW which is 1.2 times of 100% SS.
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Statement of Novelty: This paper introduces a new technique to enhance the production of biogas and increase the efficiency of COD removal. This technique is to digest sewage sludge and dried olive mill waste in different concentration, BMP tests were used to investigate and improve the effect of these co-substrate on the co-digestion process and on the performance of anaerobic digestion in mesophilic conditions. Where the olive mill waste was dried thermally through solar energy.
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Al bkoor Alrawashdeh, K. Improving Anaerobic Co-digestion of Sewage Sludge with Thermal Dried Olive Mill Wastewater. Waste Biomass Valor 10, 2213–2219 (2019). https://doi.org/10.1007/s12649-018-0234-9
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DOI: https://doi.org/10.1007/s12649-018-0234-9