Algae-Mediated Resource Recovery from Urban Wastewater

Purpose of Review Microalgae-mediated resource recovery and recycling of wastewater might be useful in producing biomass, biofertilizers, and environmentally acceptable bioproducts. This review aims to provide a comprehensive understanding of the challenges and opportunities of wastewater valorization to valuable algal biomass by opting a self-sustainable carbon-neutral approach.Recent FindingsVarious challenges and opportunities of using unsterilized urban wastewater are explored to provide insights into addressing the processing issues. Major wastewater challenges include turbidity with blackish appearance, emerging contaminants, pathogenic microbial community, and higher nutrient load. A brief comparison of sterilization techniques has been made, mainly focusing on principles, advantages, and limitations. Despite the challenges, it is found that microalgae-based resource recovery could be a viable and promising opportunity in a wastewater-driven integrated biorefinery paradigm.Despite the availability of various wastewater treatment methods, microalgae-based wastewater treatment is promising, and carbon neutral approach which transforms the nutrients to valuable biomass, thereby reducing the nutrient load of the water. However, microalgal cultivation in wastewater encounters physical and biological challenges. In this article, challenges, opportunities, and sterilization methods of wastewater are critically reviewed concerning microalgae-based resource recovery from the urban wastewater. The processing of wastewater-produced algal biomass could be valorized into multiple products in minimal waste and carbon-neutral paradigm.