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Water Res. 2016 Mar 15;91:371-8. doi: 10.1016/j.watres.2015.12.054. Epub 2016 Jan 4.

Influence of microalgal N and P composition on wastewater nutrient remediation.

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Cranfield University, Cranfield, MK43 0AL, UK.
Ecole Nationale Superieure de Chimie de Rennes, 35708 Rennes Cedex 7, France.
Scandinavian Biogas Fuels AB, Linköping University, 58 183, Linköping, Sweden.
Cranfield University, Cranfield, MK43 0AL, UK. Electronic address:


Microalgae have demonstrated the ability to remediate wastewater nutrients efficiently, with methods to further enhance performance through species selection and biomass concentration. This work evaluates a freshwater species remediation characteristics through analysis of internal biomass N:P (nitrogen:phosphorus) and presents a relationship between composition and nutrient uptake ability to assist in species selection. Findings are then translated to an optimal biomass concentration, achieved through immobilisation enabling biomass intensification by modifying bead concentration, for wastewaters of differing nutrient concentrations at hydraulic retention times (HRT) from 3 h to 10 d. A HRT <20 h was found suitable for the remediation of secondary effluent by immobilised Scenedesmus obliquus and Chlorella vulgaris at bead concentrations as low as 3.2 and 4.4 bead·mL(-1). Increasing bead concentrations were required for shorter HRTs with 3 h possible at influent concentrations <5 mgP L(-1).


Biomass; Immobilisation; Internal composition; Microalgae; Species

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