The multi-billion dollar worldwide recycling industry performs a vital social and environmental function. The industry has no peer in terms of conserving the world's resources while the various stages of the recycling process provide employment for millions of people all around the world.

Using skills honed over many centuries, recyclers collect products that have reached the end of their useful lives and then transform them into highly valuable secondary raw materials that can be fed back into the manufacturing process. These secondary materials have to conform to critical specifications laid down by consumers, who include the world's leading steelmakers, foundries and paper/board manufacturers. If it were not for the recycling industry's professionalism, expertise and large-scale investment, a substantial proportion of these end-of-life goods would be consigned to landfill and the valuable materials they contained would be lost to the production cycle for ever. Furthermore, some potentially useful materials would become hazards rather than being retained as a resource.

Recycling is a different secondary processing, which involves the use of waste, waste components (eg parts of machines) to produce new products such as waste paper for paper, scrap tires as fuel
in cement. Waste and all items are called solids and non-sewage liquid substances resulting from the business or living man. Types of waste: agricultural, industrial and municipal.
Recycling is important for protecting the environment and is increasingly used in automobiles for example, some companies seek to ensure that it was possible to reuse more than 90% of steel and non-ferrous metals used in the manufacture of their cars and use plastic materials suitable for recycling.
Large quantities of waste paper, metal, plastic and glass are used repeatedly in the process of recycling (disposal). Most of these materials is collected in Western countries to have containers in homes or factories. But the residual waste also contain many valuable materials that can be separated at different stages of their treatment before disposal to landfill.
The dried waste is burned, the air in order to obtain useful substances such as carbon monoxide, methane, hydrogen, mineral oils, coal or charcoal. Ferromagnetic metals (containing iron or nickel) are drawn from the conveyor belt, where the waste is transported by a strong magnet suspended above it. Separates the glass, aluminum and other nonferrous metals in the process of using their different physical properties.
Often the materials are separated based on differences in their density, ie specific gravity. One type of separator operates in a way that powdered dust falling on a moving conveyor belt at the top, more dense material sinks to the bottom and the lighter goes up. If you burn garbage, metals and glass melt and fall as the heaviest, at the very bottom of the furnace, where they can be easily collected.
Glass is separated from the garbage can then sort the colored and white. For this purpose, ground glass passes through a strong magnetic field. Pieces of white glass does not interact with the field, while the colored glass affects and is separated. What's more, you can color sort glass by color. Pieces of glass pass through streams of light, and obtained its color changes are recorded by the photosensitive elements. Based on the signals sent by the glass-sorting machines, each color separately.
As far as metals are recovered mainly iron and aluminum. In smaller quantities obtained lead, copper, and mercury. The high price of precious metals such as gold or platinum, makes a cost-effective recovery of even small quantities.
Bacteria thus they occur in any environment, and the largest clusters are in their filth allow life on earth. Bacteria found in a landfill, and their function is to waste disposal. Bacteria contribute to the circulation of elements in nature. Thanks to all that processing is used again (eg, purify water well). Are also present in the soil, causing the ground not once mineralization.