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Environmental Engineering

Environmental Engineering
The pathogens can be killed by

None of these
Chlorination
Oxidation
Nitrification

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Environmental Engineering
The suitable layout of distribution system for a city with roads of rectangular pattern is

Dead end system
Ring system
Grid iron system
Radial system

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Environmental Engineering
The alum, when added as a coagulant in water

Does not affect pH value of water
Increases pH value of water
Decreases pH value of water
Does not require alkalinity in water for flocculation

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Environmental Engineering
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

X/4
2X
X/2
X

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Environmental Engineering
In water treatment, rapid gravity filters are adopted to remove

Floating solids and dissolved inorganic solids
Bacteria and colloidal solids
Dissolved organic substances
Dissolved solids and dissolved gases

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Environmental Engineering
The working conditions in imhoff tanks are

Aerobic in lower compartment and anaerobic in upper compartment
Anaerobic only
anaerobic in lower compartment and aerobic in upper compartment
Aerobic only

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