A review on techniques for the cleaning of wastewater

Abstract

The review thoroughly examines current approaches to wastewater treatment, addressing the urgent worldwide issues of water contamination and shortage. Given that the majority of Earth's surface is covered by water, only a small portion of it is really appropriate for consumption. As a result, billions of people are at risk of experiencing water shortages on a yearly basis. The research examines several therapeutic strategies, including physical, chemical, and biological approaches, with a specific emphasis on their effectiveness, constraints, and current advancements. Adsorption and membrane technology are physical technologies that use developments in nano-sized materials to improve the removal of contaminants. Coagulation/flocculation procedures encounter difficulties in de-colorization and sludge generation, notwithstanding their effectiveness. Chemical techniques such as electrochemical and photo-electrochemical oxidation, Fenton's oxidation, and ozonation demonstrate sophisticated oxidation mechanisms that have the ability to break down pollutants. Nevertheless, the need for continuous improvement arises due to problems such as energy expenses and the generation of by-products. The use of microorganisms for the breakdown of organic colorants is a promising ecologically acceptable solution in the field of biology. Biofilm applications show potential in the treatment of sewage water, highlighting the capacity of microorganisms to adapt and their enzymatic activity. This review highlights the urgent need for ongoing research and technological advancements in order to address the global issue of water scarcity. It emphasizes the importance of incorporating sustainable, cost-effective, and environmentally friendly wastewater treatment solutions into worldwide water management strategies, in order to ensure a resilient future.