1
GATE CE 2024 Set 1
Numerical
+2
-0.833

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).

Your input ____
2
GATE CE 2024 Set 1
Numerical
+2
-0.833

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).

Your input ____
3
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 4 English The total hardness (in mg/L as $${\mathrm{CaCO}}_3$$) of the water sample is ______.
Your input ____
4
GATE CE 2016 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. GATE CE 2016 Set 2 Environmental Engineering - Quality Control of Water Question 5 English The non-carbonate hardness (expressed in mg/L as $${\mathrm{CaCO}}_3$$) of the sample is
A
40
B
165
C
195
D
205
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