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PROJ00124
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Last modified
11/19/2009 11:01:58 AM
Creation date
10/5/2006 11:36:51 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C153394
Contractor Name
Wellington, Town of
Contract Type
Loan
Water District
1
County
Larimer
Bill Number
SB 81-439
Loan Projects - Doc Type
Feasibility Study
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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 />Table 5 <br />\~INGI'ClN \-IATER TREi\'I'MENT PLANT <br />DESIGN CRITERIA ~F'lARY <br /> <br />Design Flow Rate 750,000 GPD Peak Flow RatE> 900,000 GPD <br />Process Description - L:iJre/Soda softening and/or Turbidity Rerroval. <br />Treatrrent Steps - Flash ~ti.xing, Flocculation, Sedirrentation, Dual Media <br />Gravity Filtration, Post Chlorination and/or Pre-chlorination. <br /> <br />1. Flash Mix: <br />Corrpartrrent Size <br />Volurre <br />Detention t:iJre <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 sec - 1 <br /> <br />Chemicals to be added to Flash Mix Compartrrent (L:iJre Soda softening) <br />L:iJre 240 rrg/l <br />Soda Ash 160 rrg/l <br />Alwninum Sulfate 30 rrg/l <br />Powdered Activated Carbon as required <br /> <br />Sludge Reeycle from clarifier sludge hopper via 4" 1'1 air lift purrp. <br /> <br />II. Flocculation: <br />Conpart:rrent Size <br />Vo1urre <br />Detention t:iJre <br />Type of flocculator <br /> <br />Design Velocity Gradient <br /> <br />III. Sedirrentation: <br />CrnpartIrent Size <br />Volume <br />Detention tine <br />Type of sludge rerroval <br />Setting tube area <br />Max. design tube flow <br />Plug Flow Velocity <br />Overflow weir length <br />Weir overflow rate <br /> <br />IV. Dual M:rlia Gravity Filtration: <br />Number of cells <br />Cell Size <br />Total filter area <br />Design filtration rate <br />Max. filtration rate (intermittantl <br />Design max. backwash rate <br />Backwash purrps <br />Backwash operation <br /> <br />Underdrain <br /> <br />M:rlia <br /> <br />12 <br /> <br />12' x 12'-6" x 14' SWD <br />2100 ft.3 <br />30 minutes <br />Horizontal paddle variable <br />speed <br />Adjustable with maxirm.nn 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 minirm.nn <br />2 GPH/ft.2 <br />0.33 FPM <br />88 ft. <br />8,522 GPD/ft. <br /> <br />5 <br />5' x 5' <br />125 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 />12" support gravel <br />12" 0.55 nun sand <br />18" No. 1 Anthracite <br />
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