03-01 - Recap so far we've covered the sinks for D.O i.e...

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Recap : so far we've covered the sinks for D.O., i.e., BOD, NOD and the rate at which these reactions happen. These are elements of our phenomenological model which will (hopefully) describe what happens when a wastewater is discharged to a stream. We have not yet talked about D.O. sources. The most important of these is: REAERATION
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Background chemistry : oxygen gas in H 2 O is in equilibrium with the atmosphere via the following reaction: For this reaction the ratio of O 2 (aq) [concentration] to O 2 (gas) [partial pressure in atmospheres] is a constant called the: __________________________ constant ( ) For a given P O 2 (normally 0.21 atm) there is some maximum concentration of oxygen C* OX which will exist at equilibrium in solution. Note We also call C* OX the _____________________ concentration of oxygen in the water. O 2 (gas) O 2 (dissolved in water) Henry’s Law K H saturation 2 H ox H O K is an equilibrium constant for this reaction. [C* ] mole mg K (units : or ) P L atm L atm 
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The equilibrium constant K H is a function of temperature and T.D.S.
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This note was uploaded on 04/13/2010 for the course CEE 3510 taught by Professor Lion during the Spring '10 term at Cornell.

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03-01 - Recap so far we've covered the sinks for D.O i.e...

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