This study integrates an earthenware-based biofilter into photobioreactors (PBR), to allow Spirulina growth on organic nutrient sources. The earthenware acted as permeable membrane, enabling the bio-oxidation of soluble organics and the diffusion of mineralised ions to the photobioreactor. When fed with lactic acid fermentation effluents (organic loading rates of 11.1 mg-COD L−1PBR d−1 and 1.7 mg-Total-N L−1PBR d−1), Spirulina growth rate (19.4 mgdry mass L−1 d−1) was up to the mark with respect to a control with Zarrouk medium. However, the protein content was of 34% w/wDM (as compared to 57% in the control), likely due to insufficient mineral-N supply under the tested system-configuration. The dissolved photosynthetic oxygen established a redox potential gradient (300–400 mV) across the membrane, acting as an electron sink towards consistent COD removal rates (9.0 ± 0.7 mg-COD L−1 d−1). Configurations with higher biofilter/photobioreactor volume ratios should be tested, to improve nitrogen supply rates.

Earthenware-based biofilter configuration for Spirulina cultivation on nutrients recycled from food-industry waste streams: A preliminary study / F. Girotto, A. Schievano, A. Ida, G.R. Clerici, G. Sala, A. Goglio, D. Kurpan, P. Bombelli, I. Toschi, S. Bocchi, L. Piazza. - In: BIORESOURCE TECHNOLOGY REPORTS. - ISSN 2589-014X. - 18:(2022 Jun), pp. 101097.1-101097.8. [10.1016/j.biteb.2022.101097]

Earthenware-based biofilter configuration for Spirulina cultivation on nutrients recycled from food-industry waste streams: A preliminary study

F. Girotto
Primo
;
A. Schievano
Secondo
;
G. Sala;A. Goglio;P. Bombelli;I. Toschi;S. Bocchi
Penultimo
;
L. Piazza
Ultimo
2022

Abstract

This study integrates an earthenware-based biofilter into photobioreactors (PBR), to allow Spirulina growth on organic nutrient sources. The earthenware acted as permeable membrane, enabling the bio-oxidation of soluble organics and the diffusion of mineralised ions to the photobioreactor. When fed with lactic acid fermentation effluents (organic loading rates of 11.1 mg-COD L−1PBR d−1 and 1.7 mg-Total-N L−1PBR d−1), Spirulina growth rate (19.4 mgdry mass L−1 d−1) was up to the mark with respect to a control with Zarrouk medium. However, the protein content was of 34% w/wDM (as compared to 57% in the control), likely due to insufficient mineral-N supply under the tested system-configuration. The dissolved photosynthetic oxygen established a redox potential gradient (300–400 mV) across the membrane, acting as an electron sink towards consistent COD removal rates (9.0 ± 0.7 mg-COD L−1 d−1). Configurations with higher biofilter/photobioreactor volume ratios should be tested, to improve nitrogen supply rates.
Food waste; Microalgae; Microbial proteins; Nutrients recycling; Soilless farming; Spirulina;
Settore ICAR/03 - Ingegneria Sanitaria-Ambientale
CAR_RIC20STRAS_01 - Electro-active biochar: scalable bioelectrodes to ‘power’ circular resource recovery and soil carbon sinks (e-Biochar) - CAVALCA, LUCIA - CAR_RIC - Bandi Fondazione Cariplo - 2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/932054
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