In the waste treatment plant -WWTP- air is pumped into the water to-Support the growth of anaerobic-bacteria-Support the growth of aerobic-bacteria-Disinfect waterBlow human waste

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Standard VII

Chemistry

Secondary Treatment

In the waste ...

Question

In the waste treatment plant (WWTP) air is pumped into the water to:

Support the growth of anaerobic bacteria

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Support the growth of aerobic bacteria

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Disinfect water

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Blow human waste

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Q. In one method of sewage treatment, the sewage flows into a _______ tank in which anaerobic bacteria decompose the waste.

Q. Which gas is used in a waste water treatment plant to disinfect the water?

Some students of class 7 were taken for an educational trip to Waste water treatment plant .The teacher explained the process of water treatment. Identify the correct order of the process.

Step I:The liquid material is passed through sedimentation tank where solid waste like faecal matter, sand, grit settles down.

Step II:This solid matter is then removed with the help of a scrapper. This is the sludge.

Step III: Waste water is passed through bar screens to remove big objects like cans, sticks, rags etc.

Step IV: A skimmer removes the floatable solids like oil, grease etc.

Step V: Air is pumped into clarified water to help aerobic bacteria to grow. The bacteria then consume the unwanted matter still present in clarified water.

Step VI: The clear water so obtained is called clarified water.

Step VII:The suspended microbes settle at the bottom & the water is removed from the top.

The tank in which the aerobic bacteria grows and decompose the organic waste is called:

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