Write a short note on modern landfill sites for waste disposal.

Explanation

i. Landfill sites are located away from the residential area.
ii. In this method of waste disposal, large pits are dug in an open area.
iii. These pits are lined with plastic sheets to prevent solil pollution caused by leaching of toxic and harmful substances into the soil.
iv. The compressed degradable waste is dumped into the pit and covered with layers of soil, sawdust, leafy waste, specific biochemicals and sometimes the bioreactors are mixed for better aeration. This completely filled pit is sealed with soil slurry.
v. Microbes present in soil and other layers decompose the waste. As a result, best quality compost is obtained after few days which can be removed and such sites can be reused.