Waste water is defined as a combination of domestic and industrial waste water, with or without rain runoff. Domestic waste water is sewage only and does not include rain runoff. Therefore, waste water is a complex mixture of natural inorganic and organic materials MIXED with man-made substances.

It contains everything DISCHARGED to the sewer, including materials washed from ROADS, railways and roofs, and, of course, where the sewer is damaged, ground water will also gain entry. In the broadest sense, waste water can be split into domestic (sanitary) waste water, also known as sewage, industrial waste water and, finally, municipal waste water which is a mixture of both.

The principal objectives of waste water treatment are:

1. To convert the waste materials present in waste water into STABLE oxidized end products. It can be safely DISPOSED off to inland water without any adverse eco­logical effects;
2. To protect human health in the society;
3. To recover and recycle the valuable components of waste water;
4. To ensure waste water is effectively disposed off on a regular and reliable basis;
5. To provide an economic method of disposal.

Waste water is defined as a combination of domestic and industrial waste water, with or without rain runoff. Domestic waste water is sewage only and does not include rain runoff. Therefore, waste water is a complex mixture of natural inorganic and organic materials mixed with man-made substances.

It contains everything discharged to the sewer, including materials washed from roads, railways and roofs, and, of course, where the sewer is damaged, ground water will also gain entry. In the broadest sense, waste water can be split into domestic (sanitary) waste water, also known as sewage, industrial waste water and, finally, municipal waste water which is a mixture of both.

The principal objectives of waste water treatment are: