Effect of aerobic pretreatment on anaerobic digestion of olive mill wastewater (OMWW): An ecoefficient treatment |
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| Affiliation: | 1. Instituto de la Grasa (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera km 1, 41013 Sevilla, Spain;2. School of Civil Engineering, The University of Queensland, Campus St. Lucia – AEB Ed 49, St Lucia 4067, QLD, Australia;3. Department of Chemical and Environmental Engineering, University of Sevilla, Higher Technical School of Engineering, Camino de los Descubrimientos, s/n, Sevilla, Spain;4. Department of Cell Biology, University of Sevilla, Sevilla, Spain;1. Institute on Membrane Technology, Italian National Research Council – ITM-CNR, Via P. Bucci CUBO 17C, 87036 Rende (CS), Italy;2. Department of Environmental and Chemical Engineering, University of Calabria (DIATIC-UNICAL), Via P. Bucci CUBO 45/A, 87036 Rende (CS), Italy;1. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy;2. Department of Industrial Engineering, University of Catania, Viale A. Doria 6, Catania 95125, Italy |
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| Abstract: | Anaerobic digestion experiments of olive mill wastewater (OMWW) without pretreatment were carried out and signs of inhibition in the biological process were observed after a time equal to 1.5 times the Hydraulic Residence Time (HRT) due to the presence of a high inhibitors concentration in OMWW. Based on these findings, OMWW was subjected to an aerobic pretreatment in order to reduce the concentration of phenolic compounds and decrease Total Chemical Oxygen Demand (TCOD), achieving a reduction of 78% and 90% of the initial polyphenols concentration and 18% and 21% TCOD reduction when the substrate was aerated for 5 and 7 days respectively.Finally, anaerobic digestion experiments using OMWW aerated for 5 and 7 days as substrate were conducted to determine the influence of aeration time on methane yields and TCOD reduction. The results yield 5 days as the aeration time that achieves best results, given that this stabilizes the anaerobic process, can reduce the TCOD by 65% and generates almost 0.39 m3 methane/kg removed TCOD.Anaerobic digestion of OMWW will be economically feasible if the waste is pretreated by aerobic digestion, since the period of return of investment obtained under these conditions does not exceed 6 years. |
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| Keywords: | Aerobic pretreatment Anaerobic digestion Olive mill wastewater Economic viability Polyphenols inhibition Methane yield |
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