Tertiary nutrient removal from wastewater by immobilised microalgae: impact of wastewater nutrient characteristics and hydraulic retention time (HRT)

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dc.cclicenceCC-BYen
dc.contributor.authorWhitton, R.
dc.contributor.authorPidou, M.
dc.contributor.authorOmetto, F.
dc.contributor.authorHenderson, R.
dc.contributor.authorRoddick, F.
dc.contributor.authorJarvis, P.
dc.contributor.authorJefferson, B.
dc.contributor.authorVilla, R.
dc.contributor.authorSantinelli, M.
dc.date.acceptance2018-07-01
dc.date.accessioned2019-11-13T10:05:03Z
dc.date.available2019-11-13T10:05:03Z
dc.date.issued2018-07-01
dc.descriptionopen access articleen
dc.description.abstractImmobilising microalgal cells has been proposed as a process solution to overcome the barriers associated with the implementation of microalgae for wastewater remediation. This work evaluated the performance and remediation mechanisms of immobilised microalgae for continuous wastewater treatment under varying hydraulic retention times (HRT). Three domestic secondary wastewaters with differing concentrations of orthophosphate (PO4-P), ammonium (NH4-N) and nitrate (NO3-N) were treated by Scenedesmus obliquus immobilised within 2% calcium alginate. Trials were run in continuous operation at HRTs of 3, 6, 12 and 20 h. Removal rates for PO4-P improved with increasing HRT, with minimum residual concentrations of 0.3–3.1 mg·L−1 observed at 3 h and 0.01–0.2 mg·L−1 at 20 h. Ammonium remediation was not linked to HRT or NH4+ concentration with minimum residual concentrations of <0.001 mg·L−1. Reduction in NO3-N improved with increasing HRT, with minimum residual concentrations of ≤19.3 at 3 h and ≤0.4 mg·L−1 at 20 h. Remediation was achieved through a combination of mechanisms including biological uptake and precipitation as a by-product of photosynthesis and nutrient metabolism. As such, immobilised microalgae have been proven to be an effective alternative solution for PO43− and NH4+ remediation of wastewater effluents at HRTs of 6–12 h.en
dc.exception.reasonopen accessen
dc.exception.ref2021codes254aen
dc.funderEPSRC (Engineering and Physical Sciences Research Council)en
dc.funder.otherAnglian Wateren
dc.funder.otherSevern Trent Wateren
dc.funder.otherScottish Wateren
dc.identifier.citationWhitton, R., Santinelli, M., Pidou, M., Ometto, F., Henderson, R., Roddick, F., Jarvis, P., Villa, R., Jefferson, B. (2018) Tertiary nutrient removal from wastewater by immobilised microalgae: impact of wastewater nutrient characteristics and hydraulic retention time (HRT). H2Open Journal, 1 (1), pp.12–25.en
dc.identifier.doihttps://doi.org/10.2166/h2oj.2018.008
dc.identifier.issn2616-6518
dc.identifier.urihttps://dora.dmu.ac.uk/handle/2086/18788
dc.language.isoenen
dc.peerreviewedYesen
dc.projectidSTREAM Industrial Doctorate Centre (Grant no. EP/L015412/1)en
dc.publisherIWA Publishingen
dc.researchinstituteInstitute of Energy and Sustainable Development (IESD)en
dc.subjecthydraulic retention timeen
dc.subjectimmobilised microalgaeen
dc.subjectwastewateren
dc.titleTertiary nutrient removal from wastewater by immobilised microalgae: impact of wastewater nutrient characteristics and hydraulic retention time (HRT)en
dc.typeArticleen

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