Bioremediation strategies in wastewater treatment and their benefits over physical and chemical methods

Large amounts of wastewater with significant concentrations of organic contaminants are produced by industrial activities, chemicals, and heavy metals, posing significant environmental risks to ecosystems and human health globally. Despite advancements in conventional treatment methods, primarily reliant on physico-chemical processes, achieving effective large-scale wastewater treatment remains challenging. Modern bioremediation strategies are increasingly recognized as viable alternatives to conventional approaches, having a vital function in enhancing the quality of water and human health. Organic pollution is a major contributor to various environmental issues, such as eutrophication, diminished dissolved oxygen levels, and the accumulation of toxins, all of which severely impact water quality. Thus, there is an urgent need to eliminate such pollutants from wastewater. Bioremediation has emerged as an eco-friendly strategy for addressing harmful substances, gaining traction due to its advantages over physico-chemical methods, including cost-effectiveness, operational simplicity, and reduced byproduct generation. Bioremediation harnesses microbial communities, including bacteria, fungi, and algae, to eliminate a number of both organic and inorganic contaminants from polluted surroundings and wastewater. This chapter will highlight the benefits and practical applications of microbes, which play a dual role in wastewater treatment and the production of high-value products like biofuels and biofertilizers. Moreover, the chapter will explore various microbial processes, including the use of biofilms as potent biological remediation tools to expedite the breakdown of environmental contaminants, as well as different types of microbe-mediated bioreactors and their applications in removing different organic as well as inorganic contaminants from wastewater. Furthermore, the advantages of biological treatments over physico-chemical methods, like coagulation-flocculation, electrocoagulation, membrane treatments, and advanced oxidation processes for wastewater treatment, will be discussed. Additionally, the chapter will address the challenges encountered when implementing microbe-mediated technology in wastewater treatment and offer insights into future perspectives in this field.