A microalgae–bacteria system was used for dairy industry wastewater treatment in sequenced batch mode in a photobioreactor. The research investigated the influence of two light intensities: 360 and 820 μmol m−2s−1 on treatment performances, microalgal cell recovery and dynamics of the protozoan community. Results showed that the light intensity of 360 μmol m−2s−1 was found to be insufficient to support photosynthetic activity after the increase of bacterial biomass leading to the decrease of organic matter and ammonium removal efficiencies from 95 to 78% and 95 to 41%, respectively. Maximum microalgal cells recovery was about 63%. Continuous modification in the protozoan community was also noticed during this test. Increasing the light intensity to 820 μmol m−2s−1 led to better microalgal cells recovery (up to 88%) and improved treatment performances. However, the decrease of protozoan richness to small flagellates and free-swimming ciliates was noticed. Moreover, the developed protozoan trophic network was found to be different from that identified in the conventional activated sludge system. The study emphasized that high increase of bacterial biomass promoted in nutrient- and organic matter-rich wastewater can strongly affect the treatment performances as a result of the shadow effect produced on the photoautotrophic microalgae aggregates.
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Research Article|
November 22 2013
Dairy wastewater treatment using an activated sludge–microalgae system at different light intensities
O. Tricolici;
1National Research and Development Institute for Industrial Ecology – ECOIND, 71-73 Drumul Podu Dambovitei Street, 060652, Sector 6, Bucharest, Romania
E-mail: biotehnologi@incdecoind.ro
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C. Bumbac;
C. Bumbac
1National Research and Development Institute for Industrial Ecology – ECOIND, 71-73 Drumul Podu Dambovitei Street, 060652, Sector 6, Bucharest, Romania
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V. Patroescu;
V. Patroescu
1National Research and Development Institute for Industrial Ecology – ECOIND, 71-73 Drumul Podu Dambovitei Street, 060652, Sector 6, Bucharest, Romania
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C. Postolache
C. Postolache
2Department of Systems Ecology, University of Bucharest, 91-95 Splaiul Independentei Street, 050095, Sector 5, Bucharest, Romania
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Water Sci Technol (2014) 69 (8): 1598–1605.
Article history
Received:
July 01 2013
Accepted:
November 06 2013
Citation
O. Tricolici, C. Bumbac, V. Patroescu, C. Postolache; Dairy wastewater treatment using an activated sludge–microalgae system at different light intensities. Water Sci Technol 1 April 2014; 69 (8): 1598–1605. doi: https://doi.org/10.2166/wst.2013.752
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