In situ biogas stripping of ammonia from a digester using a gas mixing system
In situ biogas stripping of ammonia from a digester using a gas mixing system
Previous studies have suggested the use of digester biogas mixing systems for in situ ammonia removal from anaerobic digestates. The feasibility of this was tested at moderate and complete gas mixing rates at mesophilic and thermophilic temperatures in a 75-L digester. Experimental results showed that at gas mixing rates typical of full-scale commercial digesters the reduction in TAN concentrations would be insufficient to allow stable acetoclastic methanogenesis in mesophilic conditions, or to prevent total inhibition of methanogenic activity in thermophilic food waste digestion. Simulation based on batch column stripping experiments at 55 ?C at gas violent flow rates of 0.032 m3 m-2 min-1 indicated that ammonia concentrations could be reduced below inhibitory values in thermophilic food waste digestion for organic loading rates of up to 6 kg VS m-3 day-1. These mixing rates are far in excess of those used in full-scale gas-mixed digesters and may not be operationally or commercially feasible.
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Serna Maza, Alba
81ce5c84-2b04-49b3-86fd-3a5a6834efc2
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Serna Maza, Alba
81ce5c84-2b04-49b3-86fd-3a5a6834efc2
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Serna Maza, Alba, Heaven, Sonia and Banks, Charles
(2017)
In situ biogas stripping of ammonia from a digester using a gas mixing system.
Environmental Technology, .
(doi:10.1080/09593330.2017.1291761).
Abstract
Previous studies have suggested the use of digester biogas mixing systems for in situ ammonia removal from anaerobic digestates. The feasibility of this was tested at moderate and complete gas mixing rates at mesophilic and thermophilic temperatures in a 75-L digester. Experimental results showed that at gas mixing rates typical of full-scale commercial digesters the reduction in TAN concentrations would be insufficient to allow stable acetoclastic methanogenesis in mesophilic conditions, or to prevent total inhibition of methanogenic activity in thermophilic food waste digestion. Simulation based on batch column stripping experiments at 55 ?C at gas violent flow rates of 0.032 m3 m-2 min-1 indicated that ammonia concentrations could be reduced below inhibitory values in thermophilic food waste digestion for organic loading rates of up to 6 kg VS m-3 day-1. These mixing rates are far in excess of those used in full-scale gas-mixed digesters and may not be operationally or commercially feasible.
Text
Serna et al insitu 2017 - scholar text.docx
- Accepted Manuscript
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Accepted/In Press date: 1 February 2017
e-pub ahead of print date: 6 February 2017
Organisations:
Water & Environmental Engineering Group
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Local EPrints ID: 405585
URI: http://eprints.soton.ac.uk/id/eprint/405585
ISSN: 0959-3330
PURE UUID: e3689c7b-f953-4135-92a8-582fbea629fc
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Date deposited: 08 Feb 2017 10:22
Last modified: 16 Mar 2024 02:52
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Author:
Alba Serna Maza
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