Wastewater reclamation and reuse refer to the process of collecting, treating, and reusing wastewater for beneficial purposes instead of discharging it into natural water bodies. Wastewater is water that has been used in households, industries, commercial establishments, and agricultural activities, and contains various contaminants such as organic matter, chemicals, microorganisms, and suspended solids. Traditionally, wastewater was considered a waste product and was discharged into rivers, lakes, or oceans after minimal treatment. However, due to increasing water scarcity, rapid urbanization, population growth, and environmental concerns, wastewater is now viewed as a valuable resource that can be treated and reused safely. Wastewater reclamation involves advanced treatment processes that remove harmful pollutants and pathogens, making the water suitable for specific uses, while reuse refers to the application of the treated wastewater for various beneficial purposes. Wastewater reclamation typically involves several stages of treatment designed to progressively remove contaminants from the water. The first stage is preliminary treatment, where large solids such as plastics, rags, sticks, and other debris are removed through screening and grit removal processes. This step protects downstream treatment equipment and ensures smooth operation of the treatment plant. After preliminary treatment, the wastewater undergoes primary treatment, during which suspended solids settle at the bottom of sedimentation tanks, forming sludge. This process helps remove a significant portion of solid waste and organic matter present in the wastewater. Following primary treatment, secondary treatment is carried out to remove dissolved organic matter and microorganisms. This stage commonly uses biological processes in which microorganisms break down organic pollutants present in the water. Techniques such as activated sludge processes, trickling filters, oxidation ponds, and biofilters are used to decompose organic material. During this stage, bacteria and other microorganisms consume organic waste as food, converting it into carbon dioxide, water, and additional microbial biomass. Secondary treatment significantly improves the quality of wastewater and reduces its biological oxygen demand (BOD) and chemical oxygen demand (COD), which are indicators of organic pollution. In many cases, secondary treatment alone may not be sufficient for reuse purposes. Therefore, tertiary or advanced treatment is performed to further purify the water and remove remaining contaminants. Tertiary treatment may include filtration, disinfection, nutrient removal, and advanced technologies such as reverse osmosis, ultraviolet radiation, and membrane filtration. Disinfection using chlorine, ozone, or ultraviolet light