The increase in the global population and industrial activities has led to an extensive use of water, the release of wastewater, and overall contamination of the environment. To address these issues, efficient treatment methods have been developed to decrease wastewater nutrient content and contaminants. Microalgae are a promising tool as a sustainable alternative to traditional wastewater treatment. Furthermore, the biomass obtained from the wastewater treatment can be used in different applications, having a positive economic impact. This review describes the potential of microalgae as a biological wastewater remediation tool, including the use of genetically engineered strains. Their current industrial utilization and their untapped commercial potential in terms of bioremediation are also examined. Finally, this work discusses how microalgal biotechnology is perceived by the public and governments, analyses the potential risks of microalgae to the environment, and examines standard procedures that can be implemented for the safe biocontainment of large-scale microalgae cultures.
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