Assign_2-1_Solutions

Assign_2-1_Solutions - 1 It has been determined that the 4...

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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 mg-CaC-(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 mg-CaCOy’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 re-blended? 3) A flow Gift-10,000 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 mg-CaCng’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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