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Improving composting as a post-treatment of anaerobic digestate

Abstract : This work investigated the influences of practical parameters upon composting of digestate. The yardsticks for evaluation were digestate stabilization, nitrogenous emissions mitigation and self-heating potential. The results suggest choosing an "active" bulking agent like dry wood chips (WC) which served as free-water and nitrogen sink through composting. At an optimal volumetric WC: digestate mixing ratio of 4:1, nearly 90% of the initial NH4+/NH3 were fixed, which reduced significantly nitrogenous emissions. This mixing ratio also improved the stabilization and self-heating potential. Using small particle size WC increased narrowly O-2 consumption and reduced NH3 emission. Storing used WC prior to recycling reduced 40% N2O emission compared to directly recycled WC. Recycling compost helped to decrease NH3 emission, but quadrupled N2O emission. The optimal aeration rate (15 L h(-1) kg OM0) which was lower compared to composting of organic waste, was enough to ensure the O-2 supply and ameliorate the self-heating potential through composting of digestate. (C) 2015 Elsevier Ltd. All rights reserved.
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Submitted on : Saturday, May 16, 2020 - 8:36:14 AM
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Y. Zeng, A. de Guardia, P. Dabert. Improving composting as a post-treatment of anaerobic digestate. Bioresource Technology, Elsevier, 2016, 201, pp.293-303. ⟨10.1016/j.biortech.2015.11.013⟩. ⟨hal-02603395⟩



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