Biomass production of marine microalga Tetraselmis suecica using biogas and wastewater as nutrients

Herold, Clemens and Ishika, Tasneema and Nwoba, Emeka G. and Tait, Stephan and Ward, Andrew and Moheimani, Navid R. (2021) Biomass production of marine microalga Tetraselmis suecica using biogas and wastewater as nutrients. Biomass and Bioenergy, 145:105945. pp. 1-10. ISSN 0961-9534


Abstract

Anaerobic digestion is a suitable method for treating organic wastes and generating biogas. This biogas contains significant amount of CO2 and some other contaminants. The coupling of wastewater treatment with biogas purification using saline microalgae could effectively upgrade biogas (through photosynthetic CO2 fixation) and concurrently remove nutrients from the effluent, while producing valuable algal biomass. In this context, Tetraselmis suecica biomass production with the use of an impurity (CO2) in biogas to supply carbon, and nutrients (nitrogen and phosphorus) from anaerobically-digested piggery effluent (ADPE) was investigated at four operating pH set points (6.5, 7.5, 8.5 and 9.5). Results showed that pH 7.5 produced the optimum conditions for T. suecica growth and biogas-based CO2 removal, with the maximum biomass (59.8 mg L−1 d−1), lipid (25 mg L−1 d−1) and carbohydrate (6.5 mg L-1 d-1) productivities. Under this condition, CO2, total nitrogen and phosphorus removal efficiencies were 94.7%, 96% and 72%, respectively. Furthermore, the results showed no inhibitory effect of dissolved CH4 on the growth of T. suecica at pH 7.5, suggesting the technical feasibility of harnessing marine T. suecica for simultaneous nutrients removal from wastewaters, biogas upgrading, and production of energy-rich algal biomass. This process clearly harnesses anaerobically-digested piggery effluent not only as an asset but also uses an impurity (CO2) in biogas to produce valuable algal biomass.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Date Deposited: 17 Feb 2021 22:51
Last Modified: 17 Feb 2021 22:51
Uncontrolled Keywords: MicroalgaeT. suecica; Productivity; Biogas; Carbon dioxide; Anaerobically-digested piggery effluent
Fields of Research (2008): 09 Engineering > 0907 Environmental Engineering > 090701 Environmental Engineering Design
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401102 Environmentally sustainable engineering
40 ENGINEERING > 4011 Environmental engineering > 401106 Waste management, reduction, reuse and recycling
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9606 Environmental and Natural Resource Evaluation > 960604 Environmental Management Systems
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2406 Environmentally sustainable manufacturing activities > 240699 Environmentally sustainable manufacturing activities not elsewhere classified
18 ENVIRONMENTAL MANAGEMENT > 1801 Air quality, atmosphere and weather > 180102 Atmospheric composition (incl. greenhouse gas inventory)
10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1001 Environmentally sustainable animal production > 100199 Environmentally sustainable animal production not elsewhere classified
10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1001 Environmentally sustainable animal production > 100104 Management of water consumption by animal production
Identification Number or DOI: https://doi.org/10.1016/j.biombioe.2020.105945
URI: http://eprints.usq.edu.au/id/eprint/41386

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