Estimation of Landfill Gas Generation From Dhapa Landfill in Kolkata

摘要

Municipal solid waste (MSW) disposal and management is a major concern in the recent times, due to the advancement in global economy and its direct impact on the per capita waste generation. Municipal solid waste generation in urban regions is much greater than any other place. Kolkata, the seventh largest city in India, generates about 3000 tonne waste per day, containing 50% biodegradable organics, which on dumping at landfills emit uncontrolled landfill gas having global warming effect but a renewable source of energy. The present method of disposal of municipal solid waste in Kolkata is dumping on open ground at landfill sites which are neither sanitary landfills nor controlled landfills. In the present paper landfill gas generation rate from Dhapa landfill site in Kolkata has been estimated by using 6 different mathematical models for over a period of 30 years, alongwith an overview of the present municipal solid waste collection and disposal methodologies adopted in the city as per Municipal Solid Waste (Handling and Management) Rules 2000. The present study revealed that there is a large potential for landfill gas generation from Dhapa landfill in Kolkata but the landfill gas estimation values for different models vary from each other. It has been estimated that 6.19×10~6 to 7.53×10~6 m~3 of landfill gas is generated per year from the Dhapa landfill site in Kolkata equivalent to an annual energy generation rate of 2.96 × 10~6 to 3.6 × 10~6 kgoe.