Question

Bod5 refers to 5 days of decomposition at 20


c. If temperature is increased to 35c,then the 5 day bod can be obtained by

Answer 1

Answer:

2.5 days

Explanation:

BOD5@20°c = BOD2.5@35°c

Answer 2

Answer:

If temperature is increased to 35 degree Celsius the five days BOD can be obtained by 7 days.

Explanation:

BOD : Biological Oxygen Demand

• By using Dilution method, the temperature increased to 35 degree Celsius can be obtained. If temperature is increased to 35 degree Celsius the five days BOD can be obtained by 7 days.
• In bioreactor the BOD removal is done by increase in increase in temperature. From 20 degree Celsius the temperature was increased to 30, 40 and 50 degree Celsius.
• After reaching 50 degree Celsius the temperature was decreased.
• In Bioreactor the endogenous respiration of microbes gets increased at higher temperature.

Two stages in Biological Oxygen demand determination are:

• The Carbonaceous stage
• The nitrogenous stage

The biological oxygen demand begins after 5 days of nitrogenous stage.

The standard temperature and incubation period for BOD is 20 degree Celsius at 5 Days.

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