Domestic Wastewater Treatment Mobilization Construction - AskTOP

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EM 1110-3-17211 May 84RAWWASTEWATERFINALEFFLUENTRETURN ANDEXCESS SLUDGEFIGURE 11-1cCONTACT STABILIZATION FLOW DIAGRAMRAWWASTEWATERRIMARYEDIMENTA -TIONSLUDGE TODIGESTEREXCESS SLUDGEIAERATION TANKz w I3-6 HOURSxuaRFT1 4IRN AND EXCESS SLUDGEFINALCLARIFIERFINALEFFLUENTFIGURE 11-ldCOMPLETELY-MIXED FLOW DIAGRAMU . S . Army Corps of Engineers:FIGURE 17,-1 . ACTIVATED SLUDGE. FLOW DIAGRAMS (CONTINUED)11-4
EM 1110-3-17211 May 84being wasted for disposal . It will be considered as an option inlarger plants .f . Oxidation ditch process . The oxidation ditch process is anattractive alternative for Army application . The process is simple tooperate and maintain and performs reliably without highly skilledoperators . There are few moving parts which can wear out or fail . Bytheir very nature, oxidation ditches provide flow equalization -- animportant requirement for Army plants . They need no primary clarifierand produce a stabilized sludge which requires no further treatment(i .e ., no anaerobic digester) . Despite their simplicity, oxidationditches are a flexible technology and can be configured not only forBOD oxidation, but also for nitrification and denitrification .Oxidation ditches have lower capital and operation and maintenancecosts t°ian any other biological process for the capacity range withinwhich 75 percent of all Army plants fall .(1) An oxidation ditch is a modification of the activated-sludgetreatment process . It is commonly operated in an extended aerationmode, although conventional activated-sludge treatment is alsopossible . Typical oxidation ditch treatment systems consist of asingle, closed-loop channel 4 to 8 feet deep, with 45 degree slopingside walls .(2) Some form of preliminary treatment, such as screening,normally precedes the oxidation ditch process . Primary clarificationis usually not done . Single or multiple mechanical aerators aremounted across the channel, in a fixed or semi-fixed floating position .Horizontal-brush, cage, or disc-type aerators or vertical-shaftaerators designed for oxidation ditch applications are normally used .The aerators provide mixing and circulation in the ditch, as well assufficient oxygen transfer . Besides BOD removal, a high degree ofnitrification may occur without special modifications because of theditch's long detention time (normally 16 to 24 hours) and the longsolid retention time (10 to 50 days) . Secondary clarification isprovided in a separate clarifier, although an intrachannelclarification modification may be used, if feasible .(3) Ditches may be built of various materials, includingconcrete, shotcrete, asphalt, or impervious membranes . Concrete is themost common . Ditch loops may be oval or circular, although "ell" and"horseshoe" configurations have been used to maximize land usage .11-3 . Design basis and criteria .a . Design formulation . Table 11-1 provides design criteria .Standard design values provided hereinafter will be used .11- 5
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EM 1110-3-17211 May 84ParagraphPage
Page 10 and 11:
Vadophil - Auction No. : 18Lot No.
Page 14 and 15:
Table 3-1 . Evaluation of Wastewate
Page 17 and 18: Table 3-1 . Evaluation of Wastewate
Page 19 and 20: Table 3-2 . Approximate Performance
Page 21 and 22: EM 1110-3-17211 May 844-3 . Estimat
Page 23 and 24: EM 1110-3-17211 May 84c . Industria
Page 25 and 26: EM 1110-3-17211 May 84d . Treatment
Page 27 and 28: EM 1110-3-17211 May 84CHAPTER 5SELE
Page 29 and 30: EM 1110-3-17211 May 84zWJWWWU . S .
Page 31 and 32: EM 1110-3-17211 May 84CHAPTER 6FLOW
Page 33 and 34: EM 1110-3-17211 May 84WATER SURFACE
Page 35 and 36: EM 1110-3-17211 May 847-1 . General
Page 37 and 38: EM 1110-3-17211 May 84channel shoul
Page 39 and 40: EM 1110-3-17211 May 84_cfs = net ar
Page 41 and 42: EM 1110-3-17211 May 848-3 . Design
Page 43 and 44: EM 1110-3-17211 May 8410080QWQW60NO
Page 45 and 46: EM 1110-3-17211 May 84(2) Weir rate
Page 47 and 48: EM 1110-3-17211 May 84Table 8-3 .Ty
Page 49 and 50: No Discharge DischargeSeries-parall
Page 51 and 52: EM 1110-3-17211 May 84dispersed oxy
Page 53 and 54: EM 1110-3-17211 May 84a . Inlet . I
Page 55 and 56: EM 1110-3-17211 May 84CHAPTER 10TRI
Page 57 and 58: SINGLE-STAGEREM 1110-3-1721 1 May 8
Page 59 and 60: EM 1110-3-17211 May 84(5) Periphera
Page 61 and 62: EM 1110-3-17211 May 84K20 = Treatab
Page 63 and 64: EM 1110-3-172'll May 84Table 10-3 .
Page 65 and 66: EM 1110-3-17211 May 84CHAPTER 11ACT
Page 67: EM 1110-3-17211 May 84RAW14ASTEWATE
Page 71 and 72: EM 1110-3-17211 May 84a . Air requi
Page 73 and 74: EM 1110-3-17211 May 84with unique,
Page 75 and 76: EM 1110-3-17211 May 84Contact Stabi
Page 77 and 78: EM 1110-3-17211 May 8412-3 . Sludge
Page 79 and 80: EM 1110-3-17211 May 84Table 12-1 .A
Page 81 and 82: EM 1110-3-17211 May 84Table 12-3 .H
Page 83 and 84: EM 1110-3-17211 May 84requirements
Page 85 and 86: EM 1110-3-1721 1 May 84b . Landfill
Page 87 and 88: EM 1110-3-1721 1 May 84Table 13-1 .
Page 89 and 90: EM 1110-3-17211 May 84(2) Inspectio
Page 91 and 92: EM 1110-3-17211 May 84CHAPTER 14SMA
Page 93 and 94: EM 1110-3-17211 May 84CHAPTER 15SAF
Page 95 and 96: EM 1110-3-17211 May 84g . A portabl
Page 97 and 98: EM 1110- 3-17211 May 84Weight Remov
Page 99 and 100: EM 1110-3-17211 May 84requirements
Page 101 and 102: EM 1110-3-17211 May 84With a filter
Page 103 and 104: E14 1110-3-17211 May 84Overall effi
Page 105 and 106: EM 1110-3-17211 May 84therefore,0 .
Page 107 and 108: EM 1110-3-17211 May 84Aeration requ
Page 109 and 110: EM 1110- 3-17211 May 84Gas yield =
Page 111 and 112: 1110-3-172' .1'i1 May 8-4Pressure a
Page 113 and 114: SM '11,10-1-472may 84be needed unde
Page 115 and 116: EM 1110-3-17211 May 84APPENDIX BOXY
Page 117: Ek'1110-i;, 3-;47211 May 84Chlorine
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Domestic Wastewater Treatment Mobilization Construction - AskTOP

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