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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Cultivation of microalgae at high-density with pretreated liquid digestate as a nitrogen source : fate of nitrogen and improvements on growth limitations
Authors: Pulgarin, Adrian
Kapeller, Alexander Garcia
Tarik, Mohamed
Egloff, Sophia
Mariotto, Marina
Ludwig, Christian
Refardt, Dominik
et. al: No
DOI: 10.1016/j.jclepro.2021.129238
Published in: Journal of Cleaner Production
Volume(Issue): 324
Issue Date: 2021
Publisher / Ed. Institution: Elsevier
ISSN: 0959-6526
Language: English
Subjects: Microalgae; High-density cultivation; Liquid digestate; Nutrient recycling; Nitrogen mass balance
Subject (DDC): 570: Biology
Abstract: A liquid digestate rich in ammonium nitrogen (8.3 g L−1) was collected from an agricultural biogas plant and supplied to microalgae cultures as their only nitrogen source. Chlorella vulgaris was cultivated for up to 21 days, both under controlled conditions in laboratory-scale glass-column photobioreactors as well as outdoors in an open pilot-scale thin-layer photobioreactor. By systematically addressing issues associated with the use of liquid digestate (i.e., turbidity, nutrient imbalance, ammonium toxicity, and acidification), microalgae were robustly cultivated at a high density and cultures achieved a net biomass dry weight of between 10 and 14 g L−1, and a productivity of up to 0.93 g L−1 d−1 (93% of maximum expectation). Cultivation in the thin-layer photobioreactor achieved areal productivities between 7 and 10 g m−2 d−1. Water acidification due to the uptake of ammonium by microalgae was prevented by a controlled addition of NaOH. A detailed mass balance showed that, despite high removal efficiencies (approximately 3% of the supplied nitrogen remained in the medium), microalgae assimilated only 40–60% of the supplied nitrogen and, consequently, a large amount of nitrogen was lost to the atmosphere.
Fulltext version: Published version
License (according to publishing contract): CC BY-NC-ND 4.0: Attribution - Non commercial - No derivatives 4.0 International
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Published as part of the ZHAW project: BIOMAT (Integrated Bio-based Materials Value Chains)
Appears in collections:Publikationen Life Sciences und Facility Management

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