1
GATE CE 2024 Set 1
Numerical
+2
-0

Activated carbon is used to remove a pollutant from wastewater in a mixed batch reactor, which follows first-order reaction kinetics.

At a reaction rate of 0.38 /day, the time (in days) required to remove the pollutant by 95% is _______________ (rounded off to 1 decimal place).

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2
GATE CE 2024 Set 1
Numerical
+2
-0

A water treatment plant treats 25 MLD water with a natural alkalinity of 4.0 mg/L (as CaCO3). It is estimated that, during the coagulation of this water, 450 kg/day of calcium bicarbonate (Ca(HCO3)2) is required based on the alum dosage.

Consider the atomic weights as: Ca-40, H-1, C-12, O-16.

The quantity of pure quick lime, CaO (in kg) required for this process per day is _______ (rounded off to 2 decimal places).

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3
GATE CE 2023 Set 2
MCQ (More than One Correct Answer)
+2
-0
In the context of water and wastewater treatments, the correct statements are:
A
particulate matter may shield microorganisms during disinfection
B
ammonia decreases chlorine demand
C
phosphorous stimulates algal and aquatic growth
D
calcium and magnesium increase hardness and total dissolved solids
4
GATE CE 2017 Set 2
Numerical
+2
-0
The analysis of a water sample produces the following results: GATE CE 2017 Set 2 Environmental Engineering - Quality Control of Water Question 12 English The total hardness (in mg/L as $${\mathrm{CaCO}}_3$$) of the water sample is ______.
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