WORLD HISTORY

Detailed explanation-1: -Sewage treatment plants greatly reduce the risk of disease by removing harmful substances from wastewater. However, the treatment process relies on a constant, reliable electricity supply-a luxury that a lot of developing countries do not have.

Detailed explanation-2: -Sewers are extremely important components of urban infrastructure that helps keep the urban environment safe from flooding and prevents the spread of water-borne diseases by safely transporting waste water to the waste water treatment works and through the transport of rain water from urban surfaces.

Detailed explanation-3: -Sewers: A sewer is an underground pipe that carries sewage or transports the sewage from homes and commercial buildings to the sewage treatment plants, where the sewage can be treated. Sewerage: A sewerage system is a system for wastewater collection.

Detailed explanation-4: -This sewer system disposes sewage water to treatment plants which is further treated and purified by waste water treatment plants. It prevents us to drink polluted water as this system transports dirty sewage water to treatment plants where it is purified and made reusable.