Dissolved gas separation for engineered anaerobic wastewater systems

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dc.contributor.authorHeile, S.
dc.contributor.authorChernicharo, C. A. L.
dc.contributor.authorBrandt, E. M. F.
dc.contributor.authorMcAdam, Ewan J.
dc.date.accessioned2017-09-26T12:50:04Z
dc.date.available2017-09-26T12:50:04Z
dc.date.issued2017-08-09
dc.description.abstractDissolved gases produced within engineered anaerobic processes subsequently create a fugitive emission which can have financial, environmental and health and safety implications. Whilst desorption technology has been used to control dissolved gases in the drinking water sector, there is considerably less understanding of its deployment in wastewater for which there are numerous existing and emerging challenges. This review therefore focuses on existing and proposed technological approaches to gas desorption in engineered anaerobic wastewater processes, with specific emphasis on technology compatibility and downstream gas phase management. Simplified engineered solutions such as diffused aeration and multi-tray aerators appear robust solutions for implementation into wastewater. However, these processes are characterised by a low mass transfer coefficient and require high gas to liquid ratios (G/L) to achieve reasonable separation, which suggests their suitability is limited to small scale applications, in which gas recovery is not a priority. Packed columns and membrane contactors afford process intensification through increasing interfacial area which favours large scale applications; although both will require prefiltration technology to obviate media clogging. Vacuum or steam is the preferred driving force for separation when gas recovery is sought, while sweep-gas is energetically favoured. Sweep-gas has been used for gas recovery by operating at G/L toward the equilibrium value, which somewhat constrains mass transfer. Process selection must therefore be weighted on whole life cost, but will also be dependent upon process scale, financial (e.g. incentivisation) and non-financial (e.g. carbon) instruments, which are strongly influenced by regional policy.en_UK
dc.identifier.citationS. Heile, C.A.L. Chernicharo, E.M.F. Brandt, E.J. McAdam, Dissolved gas separation for engineered anaerobic wastewater systems, Separation and Purification Technology, Volume 189, 2017, Pages 405-418en_UK
dc.identifier.issn1383-5866
dc.identifier.urihttp://dx.doi.org/10.1016/j.seppur.2017.08.021
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/12550
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectstrippingen_UK
dc.subjectdegassingen_UK
dc.subjectdegasificationen_UK
dc.subjectdesorptionen_UK
dc.subjecteffluenten_UK
dc.subjectleachateen_UK
dc.titleDissolved gas separation for engineered anaerobic wastewater systemsen_UK
dc.typeArticleen_UK

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