Wastewater Treatment Plant Wwtp

PYQ 2024

medium

water-wastewater-treatment-and-management ID: gate-es-

The processes of removal of particles in a rapid sand filter with their description is given in the table. Process Description (i) Straining P: Removes only particles in the water large enough to get caught in the pores of the filter (ii) Sedimentation Q: Larger and heavier particles do not follow the fluid streamline around the sand grain and settle on the grain (iii) Interception R: Particles that do follow the streamline, but are too large and are caught because they brush up against the sand grains (iv) Diffusion S: Very small particles are experiencing Brownian motion and may collide with the sand grains by chance Select the correct match.

i- S; ii-P; iii-Q; iv-R

i-Q; ii-R; iii-S; iv-P

i-R; ii- S; iii- P; iv-Q

i-P; ii-Q; iii-R; iv-S

PYQ 2024

medium

water-wastewater-treatment-and-management ID: gate-es-

A person consumes 2.5 liters of water per day. The water quality test indicated that the supplied water has a Pb concentration of 0.6 mg/L. If the weight of the person is 75 kg, the exposure level for Pb for this person from this drinking water source is _________mg/kg/day (rounded off to 2 decimal places).

Chapter Questions
2 MCQs

Process	Description
(i) Straining	P: Removes only particles in the water large enough to get caught in the pores of the filter
(ii) Sedimentation	Q: Larger and heavier particles do not follow the fluid streamline around the sand grain and settle on the grain
(iii) Interception	R: Particles that do follow the streamline, but are too large and are caught because they brush up against the sand grains
(iv) Diffusion	S: Very small particles are experiencing Brownian motion and may collide with the sand grains by chance