Environmental Science and Engineering
2023 · Paper 1
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Complete GATE ES 2023 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.
Question 55
Open questionESNAT2 marksNeeds review
A biological reactor is getting wastewater containing 1 mole/L acetate ions as carbon source. The following reaction takes place in the bio-reactor:
Assume that all acetate ions are consumed and ammonia serves as a nutrient source. Given that 1 g acetate exerts 1.07 g COD; 1 mole bacteria =113 g VSS; 1 mole acetate ion = 59 g. Value of observed yield is ________________ (in g VSS/g COD, rounded off to two decimal places).
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A flask (100 ml volume) has wastewater, which has 0.12 mg/L geosmin. Activated carbon is added in this flask for absorbing geosmin as per the Freundlich isotherm model (
where Q is mg adsorbate/mg adsorbent and C is the equilibrium concentration in mg/L). Activated carbon to be added in this flask for getting final remaining geosmin concentration of 0.05 mg/L would be ________________ (in mg/L, rounded off to three decimal places).Log in to check the answer
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Open questionESNAT2 marksNeeds review
A pipeline is designed to deliver 20 L/s of an oil (kinematic viscosity =
m
/s and specific gravity = 0.9) under the laminar flow condition. The minimum diameter of the pipe will be __________ (in m, rounded off to two decimal places).Log in to check the answer
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