Water

Sewage Water Pollution – Treatment of Sewage Water

A big concern in most of the cities is

sewage water pollution

. Without being treated, this sewage water is drained off into the water bodies such as rivers and ponds. This sewage disposal forms a chain of adverse effects like increase in Biological Oxygen demands (BOD) and Chemical Oxygen demand (COD). Also, this leads to spreading of water-borne diseases, eutrophication, etc. Read on to know more about the

treatment of sewage water

.

The waste water that flows from industrial, domestic or other areas is called as sewage water. In a proper and efficient sewage management, this sewage water is piped or channeled out of the cities for treatment. The major bulk of the sewage consists of water, whereas the other components include chemicals and organic wastes.

Sewage Water Treatment

Many problems related to sewage water pollution may be solved easily, if the sewage water is treated efficiently before being released into water bodies like rivers and ponds. The prime objective in treating the sewage water is to remove the contaminants from the polluted water. The steps involved in treating the sewage water include:

  • Pretreatment:

    Effluent is pretreated before the actual sewage water treatment. This step helps in separating contaminants like sand, gravel, greases and oils from the polluted water. This is done by implementing the method of filtration.

  • Biological Treatment:

    Biodegradable wastes dissolved in sewage water are degraded by micro organisms. The biological wastes are transformed into solid mass. This can be easily separated afterwards.

  • Chemical Treatment:

    Following the biological treatment, the rest of the effluents are treated with the chemical disinfectants. Also, this step is called as tertiary treatment of waste water.

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