An ETP is a plant where the treatment of industrial effluents and waste waters is done. The treatment of effluents is essential to prevent pollution of the receiving water. The effluent water treatment plants are installed to reduce the possibility of pollution; biodegradable organics if left unsolved, the levels of contamination in the process of purification could damage bacterial treatment beds and lead to pollution of controlled waters. Each ETP is deigned based on the influent parameters, purpose of the treatment and best economical running cost and environmental protection rules.