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Determine the Size and Number of Aeration Basins?
For a community of 100,000, determine the size and number of aeration basins in a municipal activated sludge treatment facility. The wastewater characteristics are:
Average per-capita flow rate = 100gal/capita-day
Hydraulic residence time = 6 hrs
Wastewater concentration
BOD5 = 220mg/L
SS = 220 mg/L
Ans: Average flow rate = (100 gal/capita-day)(100.000pop)(106gal/Mgal)=10 Mgal/day
The size of the aeration basin may be determined based on a typical value for hydraulic residence time of 6 hr (4-8 hrs is the range) for a conventional activated sludge process.
A tank with vertical sides contain 3m of water in the bottom, overlain by 4m of oil with no intermixing. Draw pressure diagram due to the oil and water on one of the tank sides and
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