Waste generally means something unwanted but its precise definition differs from one country to another. The Chinese often say that a thing can be both a raw material and a waste at the same time. A material is considered as waste until it is considered as beneficial again. Thus a solid (or semi-solid) material is generally considered as solid waste in the eyes of the producers when it loses its worth to them and is discarded.
What is Solid Waste?
Solid waste is an inevitable by-product of human beings, animals and also of industrial-commercial activities. It represents the loss of material and/or energy for which the generator of the waste has paid. It includes solid and semi-solid materials generated from domestic, commercial and industrial premises or processes including services, water and waste water treatment plants, air pollution control devices, mining and agricultural operator.
The nature and abundance of solid waste in different countries depends on geographic location (region), climate, degree of industrialization , available resources,social and economic conditions, religious custom, lifestyle and behavior of consumers, also on the season of the year.