Assign_2-1_Clarification_

# Assign_2-1_Clarification_ - of 200 000 gpd What is its...

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1) It has been determined that the 4 mgd of water that is flowing into your treatment plant must have its alkalinity raised by 50 mg-CaCO3/L. How many pounds of a Soda Ash (Na 2 CO 3) ) must be added daily? Assume the soda ash is 90 pecent pure and completely dry. 2) If a 200,000 gpd flow of water bypassing your softening plant has a hardness of 100 mg-CaCO 3 /L and your plant produces a flow of 100,000 gpd at a hardness of 20 mg- CaCO 3 /L. what is the hardness of the overall flow when they are re-blended? ?

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3) A flow off 40,000 gpd is passed thought a clarifier 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
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Unformatted text preview: of 200, 000 gpd. . What is its hydraulic residence time? 5) You have concrete side molds 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? 6) A 200 cubic meter batch of water has an alkalinity of 150 mg-CaCO 3 /L. Assuming all the alkalinity is attributed to the carbonate ion, how much CaCO 3 (limestone) would be produced if all the C0 3 = is forced to precipitate by calcium (Ca ++ ) addition? Express results in units of kilograms....
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Assign_2-1_Clarification_ - of 200 000 gpd What is its...

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