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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Co-cultivation of microalgae in aquaculture water : interactions, growth and nutrient removal efficiency at laboratory- and pilot-scale
Authors: Tejido-Nuñez, Yaiza
Aymerich, Enrique
Sancho, Luis
Refardt, Dominik
et. al: No
DOI: 10.1016/j.algal.2020.101940
Published in: Algal Research
Volume(Issue): 49
Issue: 101940
Issue Date: Aug-2020
Publisher / Ed. Institution: Elsevier
ISSN: 2211-9264
Language: English
Subjects: Aquaculture; Nutrients; Protozoa; Water treatment; Chlorella vulgaris; Tetradesmus obliquus
Subject (DDC): 570: Biology
630: Agriculture
Abstract: Microalgae biotechnology is of increasing importance and a central application concerns the treatment of wastewater. Here, its implementation in a recirculating aquaculture system (RAS) to lower the discharge of wastewater is studied. To better cope with external variations in culture conditions, a co-cultivation of two species of microalgae, Chlorella vulgaris and Tetradesmus obliquus, was used to obtain a more reliable and robust culture and was compared to monocultures. This approach was tested using RAS water both under sterile and non-sterile conditions at laboratory scale and then compared to a co-culture at pilot-scale in an open thin-layer photobioreactor. Performance of cultures was tested in terms of microalgae growth and nutrient removal efficiency. Furthermore, to better understand the interaction between environmental variables and each microalgae species, their relative frequencies in co-cultures as well as the presence of protozoa and bacteria were monitored. All growth experiments were carried out successfully and, unlike in a previous study, no crashes were observed. However, shifts in species frequency in co-cultures indicated that the two species were differentially affected by cultivation conditions. Despite nutrient limitation, the pilot-scale cultivation had a high productivity (13.3 g m−2 d−1) and final dry weight (11.1 g l−1) after 29 days and demonstrated its suitability for RAS water treatment.
Further description: - Successful co-cultivation of Chlorella vulgaris and Tetradesmus obliquus - Stable cultivation despite presence of protozoa - Shifts in species frequency in co-culture likely caused by protozoa - Pilot-scale cultivation reached a final dry weight of 11.1 g l−1 - Maximum productivity at pilot-scale was 13.3 g m−2 d−1
Fulltext version: Accepted version
License (according to publishing contract): CC BY-NC-ND 4.0: Attribution - Non commercial - No derivatives 4.0 International
Restricted until: 2022-05-19
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Published as part of the ZHAW project: Biogas2Algae
Appears in collections:Publikationen Life Sciences und Facility Management

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