Question

why dustbin are categorized in different types and what is the colour?

Answer 1

To segregate waste.. Organic is green, Glass is yellow, Paper is white, Metal is grey, Plastic is blue and Hazard is red..!

Answer 2

There are certain things are not required around the house are kept aside to be sold to Kabadiwala or the Person who Buy old items. These can newspaper, used bottles, magazines,  Paper Etc.  This is one form of Segregation of waste, which is done at almost all households. Segregation our waste is essential as the amount of waste being generated today caused immense problem.  There are certain items  are not Bio Degradable but can be reused or recycled in fact it is believed that a larger portion of the waste can be recycled, a part of can be converted to compost, and only a smaller portion of it is real waste that has no use and has to be discarded.
Household waste should be separated daily into different dustbins for the different categories of waste such as Wet & Dry Waste which should be disposed of separately.  One should also keep a dustbin for toxic wastes such as medicines, batteries,  and dried shoe polish. Wet wastes, which consist of leftover foodstuff,  peels etc. should be put in a compost pit and compost can be used as manure in the garden. . If we do not dispose of the waste in a systematic manner than more than 1400 sq. km of land which the size of the city of Delhi would be required in the country by the year 2047 to dispose of it.