Integrating micro-algae into wastewater treatment: A review

Area of Science:

• Environmental Science
• Biotechnology
• Water Treatment Engineering

Background:

• Global focus on improving water source ecological status, particularly reducing nitrogen (N) and phosphorus (P) in wastewater effluent.
• Growing interest in mixotrophic micro-algae for wastewater treatment due to their ability to utilize diverse carbon and nutrient sources.

Purpose of the Study:

• To critically review micro-algae's role in wastewater treatment for enhanced reduction of N, P, and chemical oxygen demand (COD).
• To assess the potential for reduced energy demand compared to conventional biological treatment systems.

Main Methods:

• Review of cellular and metabolic mechanisms employed by micro-algae for nutrient and COD removal.
• Analysis of abiotic and biotic factors influencing micro-algae performance in wastewater treatment.
• Examination of bioreactor configurations and designs for micro-algae-based systems.

Main Results:

• Micro-algae effectively reduce N, P, and COD in wastewater by assimilating them for growth.
• Identification of optimal conditions and mechanisms for maximizing micro-algae treatment efficiency.
• Overview of current advancements and state-of-the-art in micro-algae wastewater treatment technology.

Conclusions:

• Micro-algae represent a promising, energy-efficient technology for advanced wastewater treatment.
• Further research into bioreactor design and operational factors can optimize micro-algae efficacy.
• Micro-algae contribute significantly to improving wastewater quality and ecological status.