GATE CE 2026 Set 2 — Question 64
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Environmental Engineering → Wastewater Treatment Processes → Anaerobic Treatment
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Question
Anaerobic bacteria are being utilized for the destruction of biodegradable organic content of wastewater measured in terms of Chemical Oxygen Demand (COD). The yield coefficient (Y) is 0.06 gram Volatile Suspended Solids (VSS) per gram of COD. Bacterial biomass forms the sludge during the process. The proximate chemical formula of anaerobic bacteria is .The COD (in %) converted into bacterial biomass is ______ (rounded off to the nearest integer).
Correct answer
8 to 10
Solution
1.Determine the COD equivalent of the bacterial biomass ():
The oxidation reaction for the biomass to determine its COD is:Molecular weight of .
Oxygen required for 1 mole of biomass = .
COD equivalent of 1 g of VSS = .
2.Calculate the COD converted to biomass:
Yield coefficient .COD converted to biomass per gram of COD removed =
.
3.Convert to percentage:
Percentage of COD converted to biomass = .Rounding to the nearest integer, we get 9.Continue learning with Success Tracker
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