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प्रश्न
What is sludge?
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उत्तर
- Semi-solids such as faeces that settle down during wastewater treatment are called sludge.
- This sludge is removed using a scraper and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
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संबंधित प्रश्न
Dried ______ is used as manure.
Drains get blocked by ______ and ______.
Explain the function of bar screens in a wastewater treatment plant.
Sewage is mainly a
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Which of the following is not a source of waste water?
State whether the following statement is True or False. In case a statement is false, write the correct statement.
Used water is wastewater
Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
- Sludge is scraped out and skimmer removes the floating grease.
- Water is made to settle in a large tank with a slope in the middle.
- Large objects like plastic bags are removed by passing wastewater through bar screens.
- Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.
- Wastewater enters a grit and sand removal tank.
Three statements are provided here which define the terms –
- sludge
- sewage and
- wastewater.
Pick out the correct definition for each of these terms.
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- Wastewater is released from homes, industries, hospitals and other public buildings.
Describe various steps of cleaning wastewater in a wastewater treatment plant.
