Effluent treatment plant, also known as ETP is a waste water treatment process (WWTP) that is used to treat waste water. It’s mostly used in industries like pharmaceuticals, textiles, and chemicals where extreme water contamination is a possibility. Effluent Treatment Plant plays a significant role in the treatment of industrial waste water as well as domestic sewage. Organic matter, inorganic matter, heavy metals, oil & grease, suspended particles, and other contaminants are treated in the wastewater treatment process of an ETP plant. Chemical treatment, biological treatment, a combination of chemical and biological treatment, and thermal treatment are the several types of wastewater treatment plants.