Journal
ENVIRONMENTAL TECHNOLOGY
Volume 39, Issue 4, Pages 503-515Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2017.1305001
Keywords
Bacteria competition; light; microalgae; nutrient removal; wastewater
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Funding
- Spanish Ministry of Economy and Competitiveness [CTM2011-28595-C02-01, CTM2011-28595-C02-02]
- European Regional Development Fund
- Generalitat Valenciana [GVA-ACOMP2013/203]
- Spanish Ministry of Education, Culture and Sport [FPU14/05082]
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The aim of this study was to evaluate the effect of light intensity and temperature on nutrient removal and biomass productivity in a microalgae-bacteria culture and their effects on the microalgae-bacteria competition. Three experiments were carried out at constant temperature and various light intensities: 40, 85 and 125 mu E m(-2) s(-1). Other two experiments were carried out at variable temperatures: 23 +/- 2 degrees C and 28 +/- 2 degrees C at light intensity of 85 and 125 mu E m(-2) s(-1), respectively. The photobioreactor was fed by the effluent from an anaerobic membrane bioreactor. High nitrogen and phosphorus removal efficiencies (about 99%) were achieved under the following operating conditions: 85-125 mu E m(-2) s(-1) and 22 +/- 1 degrees C. In the microalgae-bacteria culture studied, increasing light intensity favoured microalgae growth and limited the nitrification process. However, a non-graduated temperature increase (up to 32 degrees C) under the light intensities studied caused the proliferation of nitrifying bacteria and the nitrite and nitrate accumulation. Hence, light intensity and temperature are key parameters in the control of the microalgae-bacteria competition. Biomass productivity significantly increased with light intensity, reaching 50.5 +/- 9.6, 80.3 +/- 6.5 and 94.3 +/- 7.9 mgVSS L-1 d(-1) for a light intensity of 40, 85 and 125 mu E m(-2) s(-1), respectively.
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