What is Refuse?
- Garbage are putrescible organic wastes includes food articles, vegetable peelings, fruits peelings etc. When it is scientifically processed and composted, then it is possible to obtain valuable products, like grease, hog wood, fertilizer etc. Garbage normally weighs 450 to 900 kg/m3.
- Ashes are incombustible waste products(700 to 850 kg/m3).
- Rubbish: It includes all non-putrescible wastes except ashes. It includes paper, glass, rags, etc. (50 to 400 kg/m3).
Disposal of REFUSE
- By Sanitary Land Filling
- The land-filling operation is essentially a biological method of waste treatment, since the waste is stabilized by aerobic as well as anaerobic process.
- The refuse get stabilized, generally within a period of 2 to 12 months, and settles down by 20-40% of its original height.
- This method is widely adopted in our country. 90% of Indian refuse is disposed off in this manner.
- Sanitary land fills may cause troubles during peak monsoons.
- Leachate is a colored liquid, that comes out of sanitary land fills.
- Quantity of refuse produced in an average Indian city or a town is of the order of 1/4 to 1/5 heefare/day.
- Burning or incineration: In this method this is fired.
- Burying it into the sea(obselete method)
- By Composting
- Indoor method: It uses manual turning of piled up mass(refuse and night soil) for its decomposition under aerobic conditions
- Bangalore method: It is primarily anaerobic in nature; This method is widely adopted by municipal authorities throughout the country. The refuse and night soil, in this method are therefore piled up in layers in an under-ground earthen trench(10cm*1.5cm*1.5cm). This mass is covered at its top by layer of earth of about 15 cm depth, and is finally left over for decomposition.