Urban domestic waste water treatment systems are energy intensive and also a direct or indirect source of Greenhouse gases (GHGs) emissions. In developed countries as per estimates it has been found that Waste water treatment plants (WWTPs) consume about 1 to 3% of the total electric energy output. Increase in energy prices and continuously deteriorating quality of environment because of generation of energy forced the policy makers and other stakeholders to adopt suitable measures which not only increases the energy efficiency of WWTPs but also achieving the desired effluent quality at the same time.Waste water treatment requires lot of energy during several stages i.e. collection, pumping, treatment, handling, storage, disposal etc. On the other hand, waste water/sewage contains energy in different forms namely potential, chemical and thermal. The aim of this paper is to study the application of process modification techniques and management practices to achieve energy efficiency in some of WWTPs in the state of Chhattisgarh. Technical and management strategies are suggested to enhance the energy efficiency of the WWTPs. With the implementation of technical strategies about 184046 kWh of energy can be saved monthly which is around 18.17 % of the monthly electrical energy consumption and as a result ₹14.9 Million can be saved annually which otherwise have to be paid in the form of electricity bills. Anaerobic digestion helps in recovery of chemical energy entrapped in wastewater and about 157 MkJ/day of fuel value can be obtained with the recovery of methane gas. This energy can be used for heating, production of electricity through heat turbines which can be used within the WWTP premises and also transmitted to the grids if required.

Keywords : Wastewater, Greenhouse Gases, Energy Management, Urban Local Bodies, Waste Activated Sludge, Aeration, Management Strategies And Heat Recovery