Mesophilic and thermophilic anaerobic co-digestion of waste activated sludge and source sorted biowaste in pilot- and full-scale reactors |
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| Affiliation: | 1. Department of Environmental Sciences, Informatics and Statistics, University Ca'' Foscari of Venice, Dorsoduro 2137, I-30123 Venice, Italy;2. Department of Biotechnology, University of Verona, Strada Le Grazie 15, I-37134 Verona, Italy;3. Interuniversity National Consortium “Chemistry for the Environment”, Via delle Industrie, 21/8-30175 Venice, Italy;1. Department of Biotechnology, University of Verona, Italy;2. Agenzia per la Depurazione, Provincia Autonoma di Trento, Italy;1. Animal and Technology Research Center (CITA), Instituto Valenciano de Investigaciones Agrarias (IVIA), Pol. Esperanza 100, 12400 Segorbe, Castellón, Spain;2. Plant Protection and Biotechnology Center (IVIA), Ctra. Moncada-Náquera km 4.5, Moncada, Valencia, Spain;3. Institute of Animal Science and Technology, Universitat Politècnica de València (UPV), Cno. de Vera 14, 46022 Valencia, Spain |
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| Abstract: | The paper presents the results of a pilot- and full-scale experimental campaign on the anaerobic co-digestion of waste activated sludge and biowaste both in mesophilic and thermophilic conditions. The study demonstrated the possibility to increase the specific biogas production from 0.34 to 0.49 m3/kgTVS and the gas production rate from 0.53 to 0.78 m3per m3 of reactor per day changing the reactor temperature from the mesophilic (37 °C) to the thermophilic (55 °C) range. The experimental work was carried out at pilot-scale, and the results match the full-scale behaviour. Ammonia nitrogen recycled from the anaerobic digestion section to the wastewater treatment plant accounted for about 4% of the total nitrogen loading. Digestate characteristics in terms of biological stability and heavy metals content suggested the opportunity of a short time post-aerobic stabilisation, leading to a high quality compost product. |
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