Activated carbon pre-treatment was applied to anaerobic digestion effluent in order to reduce the optical density. Up to 78% reduction of OD was achieved suggesting activated carbon pre-treatment a promising tool to increase the light transmission of agricultural digestate. The pre-treated digestate was applied for microalgae cultivation as a source of nutrients and compared to the untreated diluted digestate. Microalgae growth was similar at the first period of cultivation in pre-treated and diluted untreated digestate. However, at the other part of the cultivation higher growth rate and biomass accumulation in untreated digestate was observed. We discuss the possibility of too high nutrient load in pre-treated digestate that may have limited the microalgae growth. PAM measurements showed no stress from the substrate highlighting that activated carbon pre-treated digestate is a suitable medium for microalgae growth. Moreover, vitality of cultures in pre-treated PBRs dropped at the end of the cultivation suggesting some inhibitory effect may be present. Results of current study demonstrate that activated carbon holds a great potential for agricultural digestate pre-treatment to decrease the optical density.

Ievina, B., Mantovani, M., Marazzi, F., Mezzanotte, V., Romagnoli, F. (2021). Application of activated carbon treated agricultural digestate for microalgae cultivation. In European Biomass Conference and Exhibition Proceedings (pp.124-131). ETA-Florence Renewable Energies.

Application of activated carbon treated agricultural digestate for microalgae cultivation

Mantovani M.;Marazzi F.;Mezzanotte V.;
2021

Abstract

Activated carbon pre-treatment was applied to anaerobic digestion effluent in order to reduce the optical density. Up to 78% reduction of OD was achieved suggesting activated carbon pre-treatment a promising tool to increase the light transmission of agricultural digestate. The pre-treated digestate was applied for microalgae cultivation as a source of nutrients and compared to the untreated diluted digestate. Microalgae growth was similar at the first period of cultivation in pre-treated and diluted untreated digestate. However, at the other part of the cultivation higher growth rate and biomass accumulation in untreated digestate was observed. We discuss the possibility of too high nutrient load in pre-treated digestate that may have limited the microalgae growth. PAM measurements showed no stress from the substrate highlighting that activated carbon pre-treated digestate is a suitable medium for microalgae growth. Moreover, vitality of cultures in pre-treated PBRs dropped at the end of the cultivation suggesting some inhibitory effect may be present. Results of current study demonstrate that activated carbon holds a great potential for agricultural digestate pre-treatment to decrease the optical density.
paper
Adsorbent; Biomass; Digestate; Microalgae; Wastewater;
English
29th European Biomass Conference and Exhibition, EUBCE 2021 - 26 April 2021 through 29 April 2021
2021
Mauguin, P; Scarlat, N; Grassi, A
European Biomass Conference and Exhibition Proceedings
2021
124
131
reserved
Ievina, B., Mantovani, M., Marazzi, F., Mezzanotte, V., Romagnoli, F. (2021). Application of activated carbon treated agricultural digestate for microalgae cultivation. In European Biomass Conference and Exhibition Proceedings (pp.124-131). ETA-Florence Renewable Energies.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/474418
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