This study aims at demonstrating the feasibility of using microalgae-bacteria consortia for the treatment of the sidestream flow of the supernatant from blackwater dewatering (centrate) in an urban wastewater treatment plant in Northern Italy. A 1200 L raceway reactor was used for the outdoor cultivation of a diverse community of Chlorella spp., Scenedesmus spp. and Chlamydomonas spp. in continuous operation mode with 10 days hydraulic retention time. During the trial, an average daily areal productivity of 5.5 ± 7.4 g TSS m−2 day−1 was achieved while average nutrient removal efficiencies were 86% ± 7% and 71% ± 10% for NH4-N and PO4-P, respectively. The microalgal nitrogen assimilation accounted for 10% of the nitrogen in the centrate while 34% was oxidized to nitrite and nitrate. The oxygen produced by microalgae fully covert the oxygen demand for nitrification. This suggests that the proposed process would reduce the aeration demand for nitrification in the water line of the plant, while producing algal biomass to be further valorized for energy or material recovery.

Mantovani, M., Marazzi, F., Fornaroli, R., Bellucci, M., Ficara, E., Mezzanotte, V. (2020). Outdoor pilot-scale raceway as a microalgae-bacteria sidestream treatment in a WWTP. SCIENCE OF THE TOTAL ENVIRONMENT, 710 [10.1016/j.scitotenv.2019.135583].

Outdoor pilot-scale raceway as a microalgae-bacteria sidestream treatment in a WWTP

Mantovani, M
Primo
;
Marazzi, F
Secondo
;
Fornaroli, R;Mezzanotte, V
Ultimo
2020

Abstract

This study aims at demonstrating the feasibility of using microalgae-bacteria consortia for the treatment of the sidestream flow of the supernatant from blackwater dewatering (centrate) in an urban wastewater treatment plant in Northern Italy. A 1200 L raceway reactor was used for the outdoor cultivation of a diverse community of Chlorella spp., Scenedesmus spp. and Chlamydomonas spp. in continuous operation mode with 10 days hydraulic retention time. During the trial, an average daily areal productivity of 5.5 ± 7.4 g TSS m−2 day−1 was achieved while average nutrient removal efficiencies were 86% ± 7% and 71% ± 10% for NH4-N and PO4-P, respectively. The microalgal nitrogen assimilation accounted for 10% of the nitrogen in the centrate while 34% was oxidized to nitrite and nitrate. The oxygen produced by microalgae fully covert the oxygen demand for nitrification. This suggests that the proposed process would reduce the aeration demand for nitrification in the water line of the plant, while producing algal biomass to be further valorized for energy or material recovery.
Articolo in rivista - Articolo scientifico
Centrate; Nitrification; Oxygen saving; Water treatment
English
18-nov-2019
2020
710
135583
reserved
Mantovani, M., Marazzi, F., Fornaroli, R., Bellucci, M., Ficara, E., Mezzanotte, V. (2020). Outdoor pilot-scale raceway as a microalgae-bacteria sidestream treatment in a WWTP. SCIENCE OF THE TOTAL ENVIRONMENT, 710 [10.1016/j.scitotenv.2019.135583].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/253043
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