A rectangular, well-mixed aeration lagoon is 60 m long, 5 m wide, and 2 m deep. It receives 400 m3/d of wastewater with a BOD5 of 336 mg/L BOD5/L for treatment. The biodegradation rate constants for the wastewater are yield coefficient = 0.8 mg VSS/mg BOD5, endogenous decay constant = 0.08 d-1, maximum specific growth rate = 1.10 d-1, and half velocity constant = 76.0 mg BOD5/L.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.