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D. All flows exceeding average hourly flows must be stored. Tabu- <br /> late excess flows as follows: NOTES <br /> PERIODS % Less Sum of <br /> Flow > 100% AHF 100% Hrs Hourly% <br /> 4 250 150 3 450 <br /> 5 150 50 3 150 <br /> 7 150 50 3 150 <br /> Total: 750% <br /> E. Equalization capacity requirement = 7.5 x 2,083 = 15,624 gal- <br /> lons or 31% of average daily flow. <br /> F. Aeration requirements: Because flow equalization volume may <br /> be contained within the batch reactor, CFM requirements are <br /> adjusted as follows: <br /> NORMALDEMAND <br /> 0.05 x 250 mg/l x 8.34 x 1000 ft' <br /> 1440 = 72.23 CFM <br /> FLOW EQUALIZATION DEMAND <br /> Criteria: <br /> 50,000 GPD flow + 31% = 0.065 MGD <br /> 0.065 x 250 mg/l x 8.34 x 1000 ft' <br /> 1440 = 94.11 CFM <br /> G. Comminution or screening and, where required, grit removal <br /> must precede the aeration/equalization chamber. <br /> H. An emergency overflow from the chamber may be provided. <br /> TERTIARY FILTERS <br /> Tertiary filters are normally designed to accept a suspended solids <br /> loading of 20-30 mg/l. Occasional shock loads from a malfunctioning <br /> secondary treatment plant can be handled; however, the filter will <br /> not function properly at continuous suspended solids loadings of 50 <br /> mg/l or greater. Therefore, design and operation o: the secondary <br /> plant become an important aspect in the overall ✓;fticiency of any <br /> tertiary system. <br /> If the secondary treatment plant is operated to produce an effluent <br /> with a suspended solids concentration of less than 30 mg/l, a prop- <br /> erly maintained, designed, and efficiently operated filter can be ex- <br /> pected to remove 85-95%, or produce a resultant final effluent sus- <br /> pended solids concentration of 2-5 mg/1. <br /> 18 <br />