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International Journal of Recent Trends in Science and Technology, ISSN 2277-2812 E-ISSN: 2249-8109
Volume 10, Issue 2, March 2014 pp 308-312
Waste to Energy Sewage Treatment Plant Delawas Jaipur, Rajasthan, India, a Case Study
Dharmraj Jangid1, Akhilendra B. Gupta2
1Research Scholar, 2Professor,Civil Engineering Department, Malaviya National Institute of Technology, Jaipur, Rajasthan, INDIA
Academic Editor : Dr. Aher K.R.
Power consumption accounts for almost 75% of the expenditure on O and M of any sewage treatment plant working on aerobic biological process. STP Delawas, Jaipur based on conventional activated sludge process was commissioned by RUIDP in 2006 with a capacity of 62.5 MLD. The average daily power consumption for operation of STP is 8576 Kwh, which amounted to an electricity bill of more than 1.2 million per month prior to the installation of power generation unit based on biogas fuel. Apart from power generation, energy saving measures taken for the plant operations has resulted in substantial saving in the energy costs. Air blowers are being operated with Variable Frequency Drive (VFD). Man Machine Interface (MMI) is provided through Programmable Logic Control System (PLC) for handling anaerobic sludge digesters that produce about 5800-6500 Nm3 of gas per day, which is being utilized for power generation. An analysis of three year data shows that the maximum power generated was about 270115 Kwh/month in March, 2010 (Av. 8713 Kwh/day) and lowest 41694 kwh/month in February, 2011(1490 Kwh per day) through gas engine. The value of generated power through biogases is about 1.4-1.66 million/ month (about 75-80% of power requirement) which is a good example of Waste to energy (WTE). This has made the STP almost self sufficient (except for meeting peak hour demand) in terms of power requirements. This study give us a though at the design stage, concept of waste to energy and improvement in efficiency of primary clarifier to get more primary sludge for anaerobic digestion to produce more biogases to get more power which will further reduce the power requirement from grid. The increase in sludge at PST will reduce the BOD load on secondary treatment unit and will help in reduction in power consumption of aeration tank.