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Waste comes in many different forms and may be categorized in a variety of ways. The types listed here are not necessarily exclusive and there may be considerable overlap so that one waste entity may fall into one to many types.
Automation of municipal solid waste sorting process is an active research area. [4] Notable mechanisms for automated sorting include: Standardization of products, especially of packaging [ 5 ] [ 6 ] [ additional citation(s) needed ] which are often composed of different materials, in particular materials hard or currently impossible to either ...
Municipal solid waste produces enormous amounts of methane, a potent greenhouse gas. [13] [14] However, nearly 90% of these methane emissions could be avoided with existing technologies. [14] [13] In particular, municipal solid waste can be used to generate energy because of the lipid content present within it.
Solid Waste Tree, Based on Resource Conservation and Recovery Act, United States Environmental Protection Agency. Solid waste means any garbage or refuse, sludge from a wastewater treatment plant, water supply treatment plant, or an air pollution control facility and other discarded material, including solid, liquid, semi-solid, or contained gaseous material resulting from industrial ...
Landfills waste are categorized by either being hazardous, non-hazardous or inert waste. In order for a landfill design to be considered it must abide by the following requirements: final landforms profile, site capacity, settlement, waste density, materials requirements and drainage.
Materials found in municipal solid waste, construction and demolition waste, [2] commercial waste and industrial wastes can be used to recover resources for the manufacturing of new materials and products. Plastic, paper, aluminium, glass and metal are examples of where value can be found in waste.
Mixed waste can also be defined as a type of waste which includes recyclable materials and organic materials. [21] Some examples of mixed waste in this context include a combination of broken glassware, floor sweepings, non-repairable household goods, non-recyclable plastic and metal, clothing, and furnishings.
Reusing materials has been a common practice for most of human history with recorded advocates as far back as Plato in the fourth century BC. [7] During periods when resources were scarce, archaeological studies of ancient waste dumps show less household waste (such as ash, broken tools, and pottery), implying that more waste was recycled in place of new material. [8]