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Emission situation of bio-waste digestation

This paper focus on the greenhouse gas (GHG) emissions measured at 12 representative anaerobic digestion (AD) plants of the separately collected organic fraction of household waste (bio- waste). The emission analysis included the determination of methane(CH4), nitrous oxide (N2O) and ammonia (NH3). The results of the emissionmeasurements were used to assess the ecological impact of bio-waste digestion and to describe possible mitigation measures to reduce the occurring GHG emissions.

GHG balances were calculated based on the measured emissions as well as the analysis of GHG credits. The results show that GHG emissions can be minimized, if the Technology and operation of the plant are adjusted accordingly. The open storage of active material (e.g. insufficient fermented residues from batch fermentation systems), open digestatestorage tanks, missing acidic scrubbers in front of bio-filters or insufficient air supplyduring the post-composting of digestate can cause relevant GHG emissions. Consequently avoiding open storage of insufficient fermented residues and using aerated post-composting with short turn over periods, smaller heaps and an optimized amount of structure (woody) material can reduce GHG emissions.

Copyright:	© Wasteconsult International
Quelle:	Waste-to-Resources 2015 (Mai 2015)
Seiten:	13
Preis:	€ 6,50
Autor:	Dipl.-Umweltwiss. Jaqueline Daniel-Gromke Dr. Walter Stinner Dr.-Ing. Jan Liebetrau Prof. Dr. Michael Nelles
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