PSEB 7th Class Science Notes Chapter 18 Wastewater Story

This PSEB 7th Class Science Notes Chapter 18 Wastewater Story will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 18 Wastewater Story

→ Sewage is liquid waste, most of it is water that has dissolved and suspended impurities. These impurities are called contaminants.

→ An underground network of pipes that carry wastewater from a home to a point of disposal is called Sewerage.

→ Sewage is transported through the closed pipes to the wastewater treatment plants where pollutants are separated and reformed and then flow into rivers and oceans.

→ During wastewater treatment pollutants are separated by physical, chemical, and biological methods.

PSEB 7th Class Science Notes Chapter 18 Wastewater Story

→ Sludge is a solid that settles to the bottom during water purification.

→ Wastewater treatment co-products are sludge and biogas.

→ A manhole is a lid-covered open space through which a person can enter and can check the sewerage system.

→ Open defecation is a breeding ground for flies, mosquitoes, and other insects that cause many diseases.

→ Do not throw oil, ghee, grease, etc. in a drain or in the open. Doing so will make drain chock.

→ Throw trash only in the bin (dustbin).

→ Pollutants: Dissolved and suspended impurities in dirty water are called pollutants.

→ Sewerage: A network of small and large pipes that carry wastewater to the drainage area.

→ Manhole: Large open mouth holes are made at every 50-60 meters of the sewerage system.

→ Individual who enters the sewage can check and remove sewage problem if any.

PSEB 7th Class Science Notes Chapter 18 Wastewater Story

→ Water Treatment Plant: A place where impurities are separated from wastewater.

→ Water Treatment: The process of separating impurities from wastewater is called water treatment.

→ Sludge is the solid that settles in the sewage water purification tank.

→ Septic tank: This is a small system of sewage treatment containing monoaerobic bacteria that remove waste products. It has connections with main sewage pipes.

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