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Article

Remediation of Aquaculture Wastewater Using the Microalga Chlorella sorokiniana

1
Samvist ehf, Grandagardi 16, 101 Reykjavik, Iceland
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Faculty of Civil and Environmental Engineering, University of Iceland, Hjardarhagi 6, 107 Reykjavik, Iceland
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Agricultural University of Iceland, Arleyni 22, 112 Reykjavik, Iceland
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Faculty of Industrial Engineering, Mechanical Engineering and Computer Science, University of Iceland, Hjardarhagi 6, 107 Reykjavik, Iceland
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3144; https://doi.org/10.3390/w12113144
Received: 2 October 2020 / Revised: 26 October 2020 / Accepted: 6 November 2020 / Published: 10 November 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
The aquaculture industry requires solutions to several environmental challenges in order to become sustainable, including adequate wastewater management. Aquaculture wastewater (AWW) is rich in nitrogen, phosphorus, organic carbon, and other elements essential for microalgae. Due to the potential for AWW to be used as a microalgal growth medium and the potential of Chlorella sorokiniana to remediate wastewater, the growth of this species in AWW was evaluated. The microalgal growth in AWW was compared to the growth in a modified BG11 growth medium containing similar nutrient concentrations as the AWW. The effect of pH regulation and air-lifting the cell suspension at different airflow rates was also studied. As a result, it was found that C. sorokiniana can grow successfully in AWW; however, its cultivation required pH regulation. This microalga species can reach a biomass concentration of up to 476 mg/L and a biomass productivity of 140 mg/L/day. Furthermore, up to 78% of the nitrogen, 77% of the phosphorus, 70% of the magnesium, 90% of the zinc, and 99% of the nickel contained in the AWW were assimilated by the microalgae. The results of this study show that microalga cultivation in wastewater has great potential to reduce contamination while generating economic benefits. View Full-Text
Keywords: Chlorella sorokiniana; aquaculture wastewater; microalgae; phycoremediation Chlorella sorokiniana; aquaculture wastewater; microalgae; phycoremediation
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MDPI and ACS Style

Lugo, L.A.; Thorarinsdottir, R.I.; Bjornsson, S.; Palsson, O.P.; Skulason, H.; Johannsson, S.; Brynjolfsson, S. Remediation of Aquaculture Wastewater Using the Microalga Chlorella sorokiniana. Water 2020, 12, 3144. https://doi.org/10.3390/w12113144

AMA Style

Lugo LA, Thorarinsdottir RI, Bjornsson S, Palsson OP, Skulason H, Johannsson S, Brynjolfsson S. Remediation of Aquaculture Wastewater Using the Microalga Chlorella sorokiniana. Water. 2020; 12(11):3144. https://doi.org/10.3390/w12113144

Chicago/Turabian Style

Lugo, Libardo A.; Thorarinsdottir, Ragnheidur I.; Bjornsson, Sigfus; Palsson, Olafur P.; Skulason, Hakon; Johannsson, Skuli; Brynjolfsson, Sigurdur. 2020. "Remediation of Aquaculture Wastewater Using the Microalga Chlorella sorokiniana" Water 12, no. 11: 3144. https://doi.org/10.3390/w12113144

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