Show all work: Wastewater containing 8 mg/L O2, 1 x 10-3 M NO3-, and 1.00 x 10-2
ID: 939168 • Letter: S
Question
Show all work: Wastewater containing 8 mg/L O2, 1 x 10-3 M NO3-, and 1.00 x 10-2 M soluble organic matter {CH2O}, is stored isolated from the atmosphere in a container richly seeded with a variety of bacteria. Assume that denitrification is one of the processes that will occur during storage. After the bacteria have had a chance to do their work, which of the following statements will be true? (a) No {CH2O} will remain, (b) some O2 will remain, (c) some NO3- will remain, (d) denitrification will have consumed more of the organic matter than aerobic respiration, (e) the composition of the water will remain unchanged.
The equation for dinitrification is: 4 NO3- + 5 {CH2O} + 4 H+ 2 N2 + 5 CO2 + 7 H2O
Explanation / Answer
option b some oxygen will remain
explanation: as denitrifiation is carried out under anearobic condition the bacterias wont consume oxygen and also during the entire denitrifiction process oxyegen is not consumed but used as electron mediator, so whenever waste water enters the denitrification process with x amount of oxygen will always comes out with x amount of oxygen.