Wastewater Story Class 7 Quiz

Anaerobic bacteria are added in the digester tank to decompose the organic matter to produce

• biogas

• Foul smell

• sludge

• sewage

The organic impurities present in sewage are

• Bacteria

• phosphorus

• human faeces

• Nitrates

Adopting good ________ practices should be our way of life

• eating

• Sanitation

• reading

• nome of these

Floating impurities (such as grease and oils) in the sedimentation tank are removed by

• Screens

• skimmer

• Cleaner

• floater.

Sewage treatment process involve

• Removal of solid material

• Sedimentation

• Aeration of clarified water

• All of these

Waste water is treated in a ________.

The sludge is decomposed by________ bacteria.

Sewage is a ________ waste.

We can disinfect water with chemicals like _________ and ________.

A __________is a covered hole in the ground above the sewer pipelines.