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CE---Civil-Engineering--->View question

The ultimate BOD (L0) of a wastewater sample is estimated as 87% of COD. The COD of this wastewater is 300 mg/L. (GATE Civil engg 2018)

The ultimate BOD (L0) of a wastewater sample is estimated as 87% of COD. The COD of
this wastewater is 300 mg/L. Considering first order BOD reaction rate constant k (use
natural log) = 0.23 per day and temperature coefficient θ = 1.047, the BOD value (in mg/L,
up to one decimal place) after three days of incubation at 27oC for this wastewater will be

Asked On2019-06-05 02:02:41 by:gokilapriya

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Ans. 160.2 
Given : 
Ultimate BOD of wastewater, L0 = 87% of COD 
 COD = 300 mg/l 
 Rate constant 1 k 0.23day  (Natural log base) 
 Temperature coefficient,  = 1.047 
To find : BOD value after 3 days of incubation at 0 27 C=?
Ultimate BOD of waste water,
 L0 = 87% of COD = 87% of 300 mg/l
As no information is given regarding temperature, 
we assume the rate constant at standard temperature of 0 20 C. 
 By Van’t haff Arrhenius relationship : 
 Rate constant at 0 27 C
(BOD)3 = 160.16mg/l

Answerd on:2019-06-07 Answerd By:Jaynil-Gaglani


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