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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />DESIGN SUMMARY <br /> <br />(273,750,000 gal/year or 838 ac. ft./year) <br /> <br />Design Flav Rate 750,000 GPD Peak Flav Rate 900,000 GPD <br />Progress Description - Lime/Soda softening and/or Turbidity Removal. <br />Treatrrent Steps - Flash /.1ixing, Flocculation, Sedimentation, Dual Media <br />Gravity Filtration, Post Chlorination and/or Pre-chlorination. <br /> <br />I. Flash Mix: <br />Corrp3.rt1rent Size <br />Vol\.lIl'e <br />Detention time <br />Type of Agitation <br />Design Velocity Gradient <br /> <br />4' X 4' X 14' SWD . <br />224 ft.3 <br />6.6 minutes <br />Mechanical <br />300 see - 1 <br /> <br />Chemicals to be added to Flash Mix Cc.trpartrrent (Lime Soda softening) <br />Lime 240 mg/l <br />Soda Ash 160 mg/l <br />Aluminum Sulfate 30 mg/l <br />PcM:1ered Activated Carbon as required <br /> <br />Sludge Recycle frcrn clarifier sludge hopper via 4" 0 air lift pump. <br /> <br />II. Flocculation: <br />Corrp3.rt1rent Size <br />Vol\.lIl'e <br />Detention time <br />Type of flocculator <br /> <br />Design Velocity Gradient <br /> <br />III. Sedirrentation: <br />Corrp3.rt1rent Size <br />Vol\.lIl'e <br />Detention time <br />Type of sludge rerroval <br />Setting tube area <br />Max. design tube flav <br />Plug Flav Velocity <br />Overflav weir length <br />Weir overflav rate <br /> <br />IV. Dual M:dia Gravity Filtration: <br />Number of cells <br />Cell Size <br />Total filter area <br />Design filtration rate <br />Max. filtration rate (intermittant) <br />Design Il'aX. backwash rate <br />Backwash pumps <br />Backwash operation <br /> <br />Underdrain <br /> <br />M:dia <br /> <br />12' x l2'-6" x 14' SWD <br />2100 ft.3 <br />30 minutes <br />Horizontal paddle variable <br />speed <br />Adjustable with Il'aXimum 75 <br />sec. -1 <br /> <br />15' x 30' x 14' SWD <br />6300 ft.3 <br />3.1 hrs. <br />Travelling Siphon Bridge <br />260 ft.2 minimum <br />2 GPM/ft.2 <br />0.33 FPM <br />88 ft. <br />8,522 GPO/ft. <br /> <br />5 <br />5' X 5' <br />l25 ft. 2 <br />4.17 GPM/ft.2 <br />5.2 GPM/ft.2 <br />20 GPM/ft.2 <br />none required <br />hydraulic differential self <br />backwashing filters <br />Type 304 stainless steel <br />perforated plate <br />l2" support gravel <br />12" 0.55 mm sand <br />18" No. 1 Anthracite <br />