Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 22, Pages 10248-10251Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.08.076
Keywords
Anaerobic digestion; Digestate; Digested liquid fraction; Digested slurry storage; Biogas emissions
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Biogas plants daily produce enormous volumes of digestate that can be handled in its raw form or after mechanical separation. In Italy, effluents are usually stored within aboveground, uncovered tanks, which make them potential emitters of biogas into the atmosphere. The purpose of this study was to estimate the amount of biogas emitted to the atmosphere during the storage phase of non-separated digestate and digested liquid fraction. The trials were performed at two northwest Italy 1 MWel. biogas plants. A floating system for the residual biogas recovery, and a set of three wind tunnels for NH3 emission measurement were used. The experiment demonstrated significant loss to the atmosphere for each of the gases; specifically, on average, 19.5 and 7.90 N m(3) biogas MWhel.(-1) were emitted daily from the storage tanks of non-separated digestate and digested liquid fraction, respectively. (C) 2011 Elsevier Ltd. All rights reserved.
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