ABSTRACT
Water resources are significantly polluted by industrial, agricultural, and residential wastes. With the growth of industries and the economy, the rate of water contamination has increased. Water treatment requires removing harmful pollutants and proceeds with recycling or discharge into water bodies. Regular water treatments are cost- and energy-consuming. Anaerobic digestion includes specialized bioreactors, a microbial inoculum of restricted or facultative anaerobes. It has a significant advantage for producing value-added products, such as biofuels and petrochemicals, by metabolizing wastewater with the help of microbes. It is a beneficial two-in-one process and is highly economical in energy production and wastewater treatment. Instead of using cost-consuming different generation feedstocks for energy production, we can use the polluted wastewater released from various industries to increase the yield of energy and other value-added derivatives. The ultimate aim of this review is to visualize the recent advances in anaerobic digestion of different wastewaters from industries to produce biofuels and other value-added products. Accomplishing sustainable energy and simultaneous water treatment requires wide-ranging improvements in all economic, social, and technical aspects. Anaerobic digestion will be a future investment for a sustainable environment.
