1. Role of Microalgae in Circular Economy 2. Recent Advancements in Algae-Bacteria Consortia for the Treatment of Domestic and Industrial Wastewater 3. Integrated Algal-based Sewage Treatment and Resource Recovery (STaRR) System 4. Microalgae-based technologies for circular wastewater treatment 5. Treatment of Anaerobic Digestion Effluents by Microalgal Cultures 6. Techno-economic analysis and life-cycle assessment of algal cultivation on liquid anaerobic digestion effluent for algal biomass production and wastewater treatment 7. Biomethane Production from Algae Biomass 8. Anaerobic Digester Biogas Upgrading Using Microalgae 9. Large scale demonstration of microalgae-based wastewater biorefineries 10. Cultivation of Microalgae on Agricultural Wastewater for Recycling Energy, Water and Fertilizer Nutrients