Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
sublimation of sodium to emit yellow colour
Its ability to absorb all other colours except yellow
The low ionisation energy of sodium

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Chemistry
Sullage water is –

Waste water released from kitchen
Waste water released from hospitals
Waste water released from toilets
Waste water released from factories

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