Talk to your grandparents and other elderly people in your family to find out the sewage disposal systems available to them. & write a short note on it.
pls tell and only and quick pls.
Answers
Talking about basic sewage treatment methods that is
Physical Method: This is basically the process of removal of small and large floating and suspended solids from sewage through two processes of sedimentation and filtration.
Firstly, the suspended particles or floating particles are removed by filtration. The filtration is then kept in large open tanks where the suspended impurities are allowed to settle down.
Biological Method: In this method, the human waste or other degrading wastes are treated by the bacteria and microbes that convert the sewage waste into byproducts such as sludge.
Chemical Method: In this method, chemicals are used in wastewater treatment. For this, chemicals are used to sterilise the wastewater so that it does not transmit any kind of infection.
Activated Sludge Method: Activated sludge method uses microorganisms to feed on the organic components of the wastewater. This process, in turn, produces a purified effluent. This solution is injected and supplied with a large amount of air to meet the oxygen demand of the microorganisms.
This entire containment removal process occurs before this impure used water reaches the natural water bodies such as lakes, rivers, oceans, and estuaries. As the availability of pure water is scarce, the difference between clean and polluted water is completely based on impurity concentration and intent of usage.
In other words, water is considered polluted when it is not fit for any specific purpose like drinking, fishing, swimming, etc. Water contaminations primarily happen due to the drainage of impure wastewater into groundwater or surface water. And different sewage management methods can prevent water pollution significantly. And the water that is safe for drinking and other domestic uses as well as for swimming, fishing etc., is considered as non-polluted water or water that is safe for drinking.