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It is estimated that every day the amount of used industrial oil that is discarded is equal to the cargo of a single petroleum tanker. Recycling is much more economical than producing new oil. It also requires a smaller investment and helps reduce pollution. Recycling wood prevents the unnecessary death of millions of trees each day. For example, to manufacture one ton of particleboard requires six trees. By recycling scrap wood, no trees need to be cut down. It also saves energy and avoids excessive increases in the price of this raw material.

The resulting liquid is homogenous and can be treated biologically. Activated-sludge installations make use of dissolved oxygen in the water to promote the growth of microorganisms that break down organic matter. This term refers to water from rain run-off in cities and from domestic use, such as house cleaning. Gray water should not be mixed with black water. INDUSTRIAL WASTEWATER The water that comes from industrial processes receives various kinds of treatment depending on what the water was used for previously.

Activated-sludge installations make use of dissolved oxygen in the water to promote the growth of microorganisms that break down organic matter. This term refers to water from rain run-off in cities and from domestic use, such as house cleaning. Gray water should not be mixed with black water. INDUSTRIAL WASTEWATER The water that comes from industrial processes receives various kinds of treatment depending on what the water was used for previously. The wastewater can contain various kinds of pollutants, including highly toxic material.

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