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Unformatted text preview: 1) It has been determined that the 4 mgd of water that is ﬂowing into your treatment
plant must have its alkaiinity raised by 50 mgCaC(BKL. How many pounds ofa Soda
Ash (Na2C03)) must. be added daily? Assume the soda ash is 90 pccent pure and
completely dry. 2) If a 200,000 gpd ﬂow of water bypassing your softening plant has a hardness of 100
mgCaCOy’L and your plant produces a ﬂow of 100,000 gpd. at a hardness of 20 mg
CaCOy’L. what is the hardness of the overall ﬂow when they are reblended? 3) A ﬂow Gift10,000 gpd is passed thought a ciariﬁer with a diameter of 20 feet. What is
the overﬂow rate? 4) A Tank two meter deep tank that is 5 meters long and 3 meters across receives a ﬂow
of 200, 000 gpd.. What is its hydraulic residence time? 5) You. have concrete side moids for tanks with a diameter of 20 feet and depth five feet.
How many tanks would you need to provide a hydraulic retention time of 1 hour for a
daily ﬂow of 1 mgd‘? What is the overﬂow rate for this conﬁguration? r a
“""eugu_um»~“"" \ 6) A 200 cubic meter batch of water has an alkalinity of 150 mgCaCng’L. Assuming all
the alkalinity is attributed to the carbonate ion, how much CaCO; (limestone) would be
produced if all the C03: is forced to precipitate by calcium (03”) addition? Express
results in units of kilograms. ...
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 Spring '10
 Malone

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