Waste water, or sewage, is a menace to health because it usually contains pathogens and other substances that may contaminate food and drinking water. It may also be offensive to the senses of sight and smell.
Industrial waste water includes liquid waste from factories and other industrial plants. Industrial waste can be disposed of by discharging it into the body water or on land.The treatment process varies with the kinds and amounts of waste in the water.
Waste water, or sewage, is a menace to health because it usually contains pathogens and other substances that may contaminate food and drinking water. It may also be offensive to the senses of sight and smell.
In cities, sewage is piped to treatment plants for primary and secondary treatment. In primary treatment, sewage flows onto holding tank. Lighter materials, such as oil and grease, float to surface. The material that settles to surface the bottom, called sludge, is withdrawn from the tank, and the material at the surface skimmed off. Secondary treatment is usually a biological process, in which helpful bacteria destroy about 90 percent of remaining organic waste , usually clorine, before being discharged at an approved site.
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