Mahindra World City Chennai- City Level Municipal Waste Management Program
Type of Waste recycled:Municipal Solid Waste (MSW)
Timeline of initiative: Mahindra World City, Chennai was officially inaugurated in September 2002
About the Initiative: Mahindra World City- Chennai extends across 1550 acres and houses more than 60 corporates along with residential facilities, schools, hospitals and hotels. MWC Chennai has an onsite Solid Waste Disposal plan which includes collection & transportation, segregation, composting process and landfilling for managing up to 16 tons per day capacity in order to segregate and dispose the township waste effectively. Segregation: The waste is segregated manually into degradable waste & non-biodegradable waste. Non-bio degradable waste is further segregated into recyclable plastics, paper cups, glass, cotton and inert materials. Collection: Waste is collected from companies as per the pre-approved collection schedule depending on the rate of waste generation. Treatment: The project processes both organic and inorganic waste. o Organic waste is converted to compost through the Mechanical Compost Facility present at the site. The process used is bio-degradation after which the digested garbage goes through further mechanical operations like separation, sieving, grading, and clarification using semi-fermented manure, gravity separators and cyclone separators. o Inorganic waste is segregated to recover recyclable material to be sold, while rejects are transported to the landfill site located within the SWM facility itself. o Non-recyclable wastes are sent to vendors for processing and manufacturing diesel. o Other waste generated at the sites such as paint containers etc. are sent back to the manufacturers for recycling. Leftover spent oil is reused as shuttering oil at site locations.
Business Model: MWC Chennai was built under a PPP model with Tamil Nadu Industrial Development Corporation (TIDCO) in a 89:11 partnership. The various companies pay the MWC management overhead and maintenance fees for certain services which include waste management, supply of water, maintenance of infrastructure, etc. MWC in turn, sells recyclable products like bottles, milk packets, cold drink cans, card board, paper cups, plastics, etc. to authorized recyclers to offset waste management costs. The organic compost produced is used for landscaping in the public areas of Mahindra World City and also sold to contractors for housekeeping and gardening services within the various industrial units inside the MWC.
Challenges: Ia) The bio-digestion process takes a long time (40-45 days) for a single batch. In the bio-degradation process, there is liquid seepage which needs to be collected and recycled again. The nuisance of flies and odour has to be dealt with by using safe chemicals. During collection, the waste needs to be unloaded on concrete platforms to prevent the ground water contamination