The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment

dc.contributor.authorCruddas, P. H.
dc.contributor.authorAsproulis, N.
dc.contributor.authorAntoniadis, Antonis F.
dc.contributor.authorBest, D.
dc.contributor.authorCollins, G.
dc.contributor.authorPorca, E.
dc.contributor.authorJefferson, Bruce
dc.contributor.authorCartmell, E
dc.contributor.authorMcAdam, Ewan J.
dc.date.accessioned2021-07-09T14:51:30Z
dc.date.available2021-07-09T14:51:30Z
dc.date.issued2021-07-06
dc.description.abstractAnaerobic ponds have the potential to contribute to low carbon wastewater treatment, however are currently restricted by long hydraulic residence time (HRT) which leads to large land requirements. A two-stage anaerobic pond (SAP) design was trialled against a single-stage control (CAP) over four HRTs down to 0.5 days, to determine the lowest HRT at which the ponds could operate effectively. No statistical differences were observed in particulate removal between the ponds over all four HRTs, suggesting solids loading is not a critical factor in AP design. Significantly higher biogas production rates were observed in the SAP than the CAP at 1.5 d and 1.0 d HRT, and microbial community profiling suggests the two-stage design may be facilitating spatial separation of the anaerobic digestion process along reactor length. Hydrogenotrophic methanogensis dominated over aceticlastic, with acetate oxidisation a likely degradation pathway. Experimental tracer studies were compared to CFD simulations, with the SAP showing greater hydraulic efficiency, and differences more pronounced at shorter HRTs. Greater flow recirculation between baffles was observed in CFD velocity profiles, demonstrating baffles can dissipate preferential flow patterns and increase effective pond volume, especially at high flow rates. The study demonstrates the potential of APs to be operated at shorter HRTs in psychrophilic conditions, presenting an opportunity for use as pre-treatments (in place of septic tanks) and primary treatment for full wastewater flows. Two-stage designs should be investigated to separate the stages of the anaerobic digestion process by creating preferential conditions along the pond length.en_UK
dc.identifier.citationCruddas PH, Asproulis N, Antoniadis A, et al., (2021) The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment. Environmental Technology, Available online 6 July 2021en_UK
dc.identifier.issn0959-3330
dc.identifier.urihttps://doi.org/10.1080/09593330.2021.1937331
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16868
dc.language.isoenen_UK
dc.publisherTaylor & Francisen_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectpsychrophilic treatmenten_UK
dc.subjectbiogasen_UK
dc.subjecthydrodynamicsen_UK
dc.subjectWastewateren_UK
dc.subjectstabilisation lagoonsen_UK
dc.titleThe impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatmenten_UK
dc.typeArticleen_UK

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