24 Questions
What is the purpose of the pretreatment process in a sewerage system?
To remove large solid substances like metal cans, paper, and plastic
How is sludge removed from settling tanks in a sewerage system?
Using a scraper every few days
What is the role of activated sludge in the secondary treatment process?
To remove organic wastes using aerobic bacteria
What happens to the biogas produced in digesters in a sewerage system?
It can be used as fuel or to produce electricity
What is the purpose of the tertiary treatment process in a sewerage system?
To remove phosphorus, nitrogen compounds, and bacteria using chlorine
How does chlorination contribute to the treatment of wastewater in a sewerage system?
By adding chlorine tablets to kill germs
Where is the treated water released after the entire wastewater treatment process?
Into other water sources
Sewerage systems carry wastewater from homes, hotels, factories, and other establishments to ______ plants.
treatment
Pretreatment process involves removing large solid substances like metal cans, paper, and plastic using ______ or vertical bars.
grids
Settling tanks or sedimentation tanks allow sand, pebbles, and soil to settle, while solid waste settles at the bottom and floatable material ______.
rises
Sludge is removed every few days with a ______, while scum is skimmed off using a skimmer.
scraper
Secondary treatment process uses aerobic bacteria to remove organic wastes in an ______ tank.
aeration
Biogas produced in digester can be used as ______ or to produce electricity.
fuel
Tertiary treatment process uses chlorine to remove phosphorus, nitrogen compounds, and ______.
bacteria
Light travels in a ______ line and follows rules in a mirror
straight
In water, reflections are distorted due to its ______ property
refractive
Reflections occur due to the change in direction of light when it hits a ______
surface
Reflections can provide valuable information about an object's ______ and properties
shape
The text emphasizes the importance of understanding reflections in ______ and optics
physics
Electricity is a flow of ______ charge
electric
Energy is essential for our daily lives as it helps us meet our basic ______
needs
We can detect energy through sensors and the response of objects to ______
energy
Just as the sun provides us with light during the day, we can use batteries and generators to provide light at ______
night
Light can travel in straight ______
lines
Study Notes
- Sewerage systems carry wastewater from homes, hotels, factories, and other establishments to treatment plants.
- Wastewater undergoes treatment to remove physical, chemical, and biological contaminants.
- Pretreatment process involves removing large solid substances like metal cans, paper, and plastic using grids or vertical bars.
- Settling tanks or sedimentation tanks allow sand, pebbles, and soil to settle, while solid waste settles at the bottom and floatable material rises.
- Sludge is removed every few days with a scraper, while scum is skimmed off using a skimmer.
- Secondary treatment process uses aerobic bacteria to remove organic wastes in an aeration tank.
- Activated sludge, produced in secondary process and primary process, is transferred to digesters for decomposition by anaerobic bacteria.
- Biogas produced in digester can be used as fuel or to produce electricity.
- Tertiary treatment process uses chlorine to remove phosphorus, nitrogen compounds, and bacteria.
- Chlorination is a chemical process where chlorine tablets are added to kill germs.
- Treated water is released into other water sources.
Explore the journey of wastewater from collection to treatment, including the removal of contaminants and purification steps like pretreatment, settling tanks, and secondary treatment using aerobic bacteria. Learn about the decomposition of sludge in digesters, production of biogas, and the final purification through tertiary treatment with chlorine.
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