Wastewater treatment plants (WWTPs) and wastewater treatment facilities are critical infrastructure for safeguarding public health and aquatic ecosystems. These systems employ multi-stage processes to purify domestic sewage, industrial effluents, and stormwater runoff, eliminating contaminants such as suspended solids, organic matter, heavy metals, and pathogens. Primary treatment involves physical separation via screens and sedimentation, while secondary treatment uses biological methods like activated sludge or biofiltration to degrade dissolved pollutants. Advanced tertiary treatment may incorporate membrane filtration, ozone oxidation, or UV disinfection for reuse standards. Modern facilities integrate smart monitoring systems to optimize energy efficiency and process control, ensuring sustainable water cycles. By preventing waterborne diseases and pollution, these systems underpin ecological balance and support circular water economies.