Waste is unwanted or unusable materials.Solid waste means any garbage or refuse; sludge; and other discarded material,including solid, semi-solid resulting from industrial, commercial, mining,and agricultural operations, and from community activities from a waste water treatment plant, water supply treatment plant, or air pollution control facility.
According to United Nations Statistics Division(UNSD) it is defined as:-
"Wastes are materials that are not prime products (that is products produced for the market) for which the generator has no further use in terms of his/her own purposes of production, transformation or consumption, and of which he/she wants to dispose. Wastes may be generated during the extraction of raw materials, the processing of raw materials into intermediate and final products, the consumption of final products, and other human activities. Residuals recycled or reused at the place of generation are excluded."
There are the flowing types of solid waste:
- Municipal solid waste
- Construction waste
- Industrial waste
- Medical waste
- Hazardous waste
Municipal Solid Waste
Municipal Solid Waste (MSW) is waste collected by or on behalf of a local authority. It comprises mostly household waste and it may include some commercial and industrial wastes. Historically, nationally the quantity of MSW has risen year on year1, presenting a growing problem for local authorities particularly as legislation, now limits (by implication2) the amount of mixed MSW that can be sent to landfill, comes into effect, becomes more stringent over time.