Question

Explain the different steps involved in water treatment plant with the help of diagram for each step.​

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Answer 1

Answer:

1. Filtration: The wastewater is passed through bar screen. Large objects; like rags, sticks, plastic bags, cans, etc. are removed in this process.

2. Grit and Sand Removal: The wastewater is slowly passed through the sedimentation tank. Grit, sand and pebbles settle down at the bottom.

3. Sedimentation: Water is then sent to the sedimentation tank. Solids; like faeces settle at the bottom. Floatable impurities; like oil and grease float on the surface. A scraper removes the faeces from the water. The impurity thus collected is called sludge; which is sent to the sludge tank. The sludge can be used to produce biogas or to produce manure. A skimmer removes the floatable impurities. Now, the water is called clarified water.

4. Aeration: Air is pumped into clarified water so that bacteria can proliferate. Bacteria consume the human waste. It leaves food waste, soap and other unwanted materials in the water. The microbes settle down at the bottom after several hours. Water is then removed from the top. This water is fit for irrigation and can be used for that purpose.

5. Chlorination: Water purified through aeration is not fit for human consumption. It needs to be treated with chlorine. For this, bleaching powder is added to the water. The chlorine kills whatever germs may be left in the water. After chlorination, the water is fit for drinking.

Answer 2

Answer:

After the wastewater passes through the grit and sand removal tank, it is allowed to settle down in a large tank, with a slope toward the middle. Solid materials like faeces settle at the bottom and are removed with the help of a scraper. The deposited waste material thus collected is called sludge.

The Wastewater Treatment Process

1. Stage One — Bar Screening. ...
2. Stage Two — Screening. ...
3. Stage Three — Primary Clarifier. ...
4. Stage Four — Aeration. ...
5. Stage Five — Secondary Clarifier. ...
6. Stage Six — Chlorination (Disinfection) ...
7. Stage Seven — Water Analysis & Testing. ...
8. Stage Eight — Effluent Disposal.

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