Microalgal bioremediation of brackish aquaculture wastewater
Author | Kashem, Abdurahman Hafez Mohammed |
Author | Das, Probir |
Author | AbdulQuadir, Mohammad |
Author | Khan, Shoyeb |
Author | Thaher, Mahmoud Ibrahim |
Author | Alghasal, Ghamza |
Author | Hawari, Alaa H. |
Author | Al-Jabri, Hareb |
Available date | 2023-05-23T09:39:15Z |
Publication Date | 2023 |
Publication Name | Science of the Total Environment |
Resource | Scopus |
Abstract | Rapid aquaculture industry development contributed to a major increase in aquaculture wastewater generation. In the context of a circular economy, aquaculture wastewater treatment should simultaneously recover nutrients from the wastewater. Among many treatment methods, bioremediation using microalgae could be a cost-effective and environmentally friendly system that can be applied to treat aquaculture wastewater and simultaneously produce high-value microalgal biomass. This study explored the feasibility of treating brackish wastewater (0.8 % NaCl) generated from a Qatari commercial tilapia farm by microalgae. At first, 10 strains were grown using wastewater from the local farm in an indoor experiment. Based on nitrogen assimilation, biomass yield, biomass quality, and ease of harvesting, 4 candidate strains (Haematococcus sp., Neochloris sp., Monoraphidium sp., and Nostoc sp.) were shortlisted for outdoor growth experiments. Although Nostoc sp. could not grow outdoor in the wastewater, the other three strains were able to assimilate at least 70.5 % of the total nitrogen in the wastewater. Haematococcus sp. and Neochloris sp. could be harvested using self-settling, whereas Monoraphidium required an energy-intensive tangential flow filtration membrane process. Hence, the overall energy requirement for bioremediation, including biomass dewatering, for Haematococcus sp., Neochloris sp., and Monoraphidium sp. were determined as 0.64, 0.78, and 5.68 MJ/m3, respectively. Neochloris sp. had almost twice the biomass yield compared to Haematococcus sp. - suggesting that Neochloris sp. could be a potential candidate for aquaculture wastewater treatment. 2023 Elsevier B.V. |
Sponsor | The authors would like to acknowledge the support of the Qatar National Research Fund (QNRF, a member of Qatar Foundation) for providing the funding (under grant GSRA8-L-2-0509-21037 ) for this study. |
Language | en |
Publisher | Elsevier |
Subject | Aquaculture wastewater Biomass Bioremediation Microalgae Neochloris sp Tilapia |
Type | Article |
Volume Number | 873 |
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Biological & Environmental Sciences [920 items ]
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Center for Sustainable Development Research [317 items ]
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Civil and Environmental Engineering [851 items ]