High rate algal systems for treating wastewater: A comparison

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dc.contributor.authorKube, Matthew
dc.contributor.authorFan, Linhua
dc.contributor.authorRoddick, Felicity
dc.contributor.authorWhitton, Rachel
dc.contributor.authorPidou, Marc
dc.contributor.authorJefferson, Bruce
dc.date.accessioned2022-06-13T18:43:32Z
dc.date.available2022-06-13T18:43:32Z
dc.date.issued2022-06-07
dc.description.abstractAlgal systems can remove nitrogen (N) and phosphorus (P) from wastewater while producing valuable biomass. The microalga Chlorella vulgaris in three concentrated forms (suspended, entrapped in Ca-alginate gel beads and as a biofilm on supports and the macroalga Oedogonium cardiacum were compared for treating secondary effluent containing 15 mg/L of ammonium (N-NH4+), 6 mg/L of nitrate (N-NO3−), and 7 mg/L of total phosphorus (TP) with a hydraulic retention time of 12 h. Identical conditions and reaction vessels enabled a direct comparison of growth systems. The biofilm system was the most effective of the microalgal systems, decreasing concentrations to 1.9 mg/L TP and 0.5 mg/L N-NO3− on average from day 3 to 24, and like the other microalgal systems, was not as effective for N-NH4+ removal (average of 9.0 mg/L). The macroalgal system decreased TP to 1.3 mg/L and N-NH4+ to ≤0.5 mg/L on average from day 16 to 30 and operated for longer than the other systems, but was not effective for N-NO3− removal (average of 4.8 mg/L). Hence the minimum TN concentration of the effluent from the macroalgal system (7.1 mg/L) was lower than for the biofilm system (10.6 mg/L) from the feed of 24 mg/L. The biofilm system produced 56 mg/L/d and the macroalgae 102 mg/L/d of biomass. The production of the highest quality effluent for longer and of more biomass than the microalgal systems, combined with their larger cell size which facilitates reactor operation, demonstrates that macroalgae can compete with microalgae for wastewater remediation.en_UK
dc.identifier.citationKube M, Fan L, Roddick F, et al., (2022) High rate algal systems for treating wastewater: A comparison. Algal Research, Volume 65, June 2022, Article number 102754en_UK
dc.identifier.issn2211-9264
dc.identifier.urihttps://doi.org/10.1016/j.algal.2022.102754
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/18018
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.subjectMicroalgaeen_UK
dc.subjectMacroalgaeen_UK
dc.subjectBiofilmen_UK
dc.subjectImmobilisationen_UK
dc.subjectWastewater treatmenten_UK
dc.subjectBiomass productionen_UK
dc.titleHigh rate algal systems for treating wastewater: A comparisonen_UK
dc.typeArticleen_UK

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