_____ is a network system of pipes that carry sewage from the households and industries to the wastewater treatment plant.
A
Sludge
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B
Sewerage
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C
Skimmer
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D
Sewer
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Solution
The correct option is B Sewerage
Sewerage is a network system of big and small pipes called sewers. This pipeline transports sewage from the point of generation, such as, households, industries, etc. to the treatment plants. Sewage contains suspended solids, organic and inorganic impurities.
Sludge is a by-product produced in wastewater treatment.
Skimmer removes the layers of oil and grease from the water during wastewater treatment.