Municipal waste volume increases with every passing day in a developing country. When facing such a predicament it is not enough to segregate waste and dispose them off. Situation such as these calls for recycling the municipal waste into something of use ensuring more effective use of energy and resources and ensuring controlled generation of waste- a process termed municipal waste processing.
Composting is the biological decomposition and stabilization of organic substrates under conditions, which allows development of very high temperature as a result of biologically produced heat. The final product of composting is sufficiently stable for storage and application to land without adverse environmental effects. The total recovery by processing of waste by composting will be approx. about 15-20 % of input waste. So as the qty of waste receipt at site will increase the production of compost will vary directly.
RDF (Refuse Derived Fuel)
The technology for RDF primarily focuses on refinement of MSW through material re-combinations, segregation, drying, size reduction, blending and homogenization. This material is further refined for separation of sand, dust, metals, glass etc before grinding or shredding. The shredded material is obtained as fluff (<2 cm size) which is further processed into pellets, briquettes or bailing to be used as fuel.
The processing of inert into civil bricks normally comprises of about 5% of the total waste generated. Having commercial importance and viability the civil bricks are then sold to the local markets.
The process is aimed at separation of LDPE, HDPE, PET and PVC items through various methods as these materials have different properties as well as reusability of recovered products. The process has 6 major components viz. Segregation into categories: Washing, Size reduction, Drying, Agglomeration and Granulation Mostly the granules are used along with fresh virgin materials for making plastic products such as carry bags, pots, baskets, buckets, mugs, drainage pipes and household utilities. With the recovery of food waste, woody waste and plastic materials from municipal waste to over 80 to 85% of the waste disposal problem is solved.
Inert disposal to Landfill
20 % of the Raw MSW is subjected for the safe disposal in landfill; the landfill is so designed to cater the future waste generation and disposal. In order to reduce the environmental impacts the landfill is developed as per MSW Rules 2000.