Impeller-powered Flocculation Basin
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8.7 Step-wise solution to a numerical problem related to a flocculation-based water treatment plant having a flow of 25 MGD. The plant is to employ alum coagulation, and pertinent data for the flocculation basin are as follows: detention time = 20 min, G = 35 sec^-1 (at 50 degrees Fahrenheit), GT = 10,000 to 100,000, width = 1.25 times depth, length = twice width, no baffling, number of impellers = 2, number of blades per impeller = 6 pitched at 45 degrees, impeller diameter = 30 % of basin width, K_L = 70.0, and K_T = 1.65.
Determine:
(a) Basin dimensions if 1-in. increments are used.
(b) Impeller diameter
(c) Speed of impellers in rpm.
8.9 A lime-soda softening plant treats a flow of 150 MGD, and the water has 86 mg/l CO2. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Determine:
(a) The pounds of quicklime and soda ash required per million gallons.
(b) The tons of quicklime and soda ash required per month if a month is considered to be 30 days.
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The solution involves step by step calculations about an impeller-powered flocculation basin.
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I tried to solve it for you this time (attached), but once again these are hard core engineering problems. Chemists have nothing to do with reactor design! Please place your questions in appropriate category i.e. engineering.
[Once again these are hard core engineering problems. Chemists have nothing to do with reactor design! Please place your questions in ...
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- "Thankyou for the feedback. I have a few question though; With the first statistic about cost below... “According to Sigma-Aldrich catalog, cost of 1L octane is AUD $ 392.00, whereas the cost of 1L ethanol is AUD $196.00. Moreover, if ethanol is obtained from sugar industry as a by-product, it may cost even less. Source of oxygen is ambient atmosphere, so it costs nothing. So ethanol is much cheaper than petrol, in fact it is half-priced: AUD $ (392-196) = $ 196.” I didn't think it made sense because the cost of petrol per litre is normally a dollar something or even less than a dollar not a couple of hundred of dollars. For example, a statistic that I found in america was: "U.S. ethanol production costs are about $1.20 per gallon of ethanol, or $1.82 per gallon on a gasoline-equivalent basis." However, I was wondering whether you could find an Australian statistic. Also, you mentioned that H20 is not a greenhouse gas. However, in the combustion equations it is actually carbon dioxide and water vapour which are produced and they are both greenhouse gases. Finally, how do I calculate the energy efficiency of ethanol and petrol? "
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