Journal
CHEMICAL ENGINEERING JOURNAL
Volume 178, Issue -, Pages 138-145Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.10.027
Keywords
Anaerobic digestion (AD); Ammonia; Biogas; Stripping; Source-segregated food waste (SSFW)
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Funding
- UK Government Department for Environment, Food and Rural Affairs (Defra)
- European Union [WR1208, 241334 (VALORGAS)]
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The feasibility of biogas stripping to remove ammonia in the anaerobic digestion of source segregated food waste was investigated. It was found in batch experiments that ammonia could be removed from digestate and that the removal followed 1st order kinetics with respect to total ammonia nitrogen concentration. Increasing temperature, biogas flow rate and initial pH all increased removal rates. Using kinetic data gathered in these experiments allowed the integration of ammonia stripping with an anaerobic digestion plant to be modelled for different configurations. Four scenarios were identified: post digestion, in situ, side-stream and pre-digestion ammonia removal relating to where in the process the ammonia stripping was performed. The modelling showed that in situ ammonia removal may be best able to reduce in-digester ammonia concentrations over a wide range of organic loading rates whereas pre-digestion showed most promise in terms of application due to the flexibility to control each part of the process separately. Further experimental work is required into these scenarios to confirm their viability. (C) 2011 Elsevier B.V. All rights reserved.
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