Hello vimal,
Important topic dor GATE is-
Population estimation
Quality of water.
Design of various components of treatment plant.
Quality characteristics of sewage BOD COD DO estimation
Design of sewage treatment plant
SWM basic topics.
Problems based on electrostatic precipitator from air pollution
Lapse rate topic in air pollution
Calculation of noise.

You can also check.here in detail
https://targetstudy.com/courses/mtech-health-safety-environmental-engineering.html

Thank you.

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