Domestic Wastewater Treatment Mobilization Construction - AskTOP

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Envirex Inc,(Noncopyrighted)FIGURE 7-1. : SCHEMATIC OF HEAVY DUTY MECHANICALLY CLEANED BAR SCREEN7-2
EM 1110-3-17211 May 84channel should be 4 feet . As a rule it is desirable to keep the sewagein the screen channel as shallow as possible in order to keep down thehead loss through the plant ; therefore, the allowable depth in thechannel may be a factor in determining the size of the screen . In anyevent, from the cross-sectional area in the channel, the width anddepth of the channel can be readily obtained by dividing the wet areaby the depth or width, whichever is the known quantity .Table 7-1 .Bar SizeinchesEfficienciesOpeningsinchesof Bar SpacingEfficiency,1/4 1 0 .8005/16 1 0 .7683/8 1 0 .7287/16 1 0 .6961/2 1 0 .667(3) Velocity check . Although screen channels are usuallydesigned on the basis of maximum normal flow or maximum storm flow, itis important to check the velocities which would be obtained throughthe screen from minimum or intermediate flows . The screen will bedesigned so that at any period of flow the velocities through thescreen do not exceed 3 fps under any flow condition .(4) Channel configuration . Considerable attention should begiven to the design of the screen channel to make certain thatconditions are as favorable as possible for efficient operation of thebar screen . The channel in front of the screen must be straight for 25feet . Mechanical screens with bars inclined at an angle of 15 degreesfrom the vertical will be installed .(5) Screenings . The graph shown in figure 7-2 will be used topredict the average amount of screenings that will be collected on thebar screen . The information required to make this estimate is flow andbar spacing . Grinding of the screenings (and returning them to thewastewater flow), incineration, and landfilling operations aresatisfactory methods for disposal of the screenings .6) Design procedure . Select bar size and spacing and determineefficiency factor . Determine number of units desired . Divide totalmaximum daily flow or total maximum storm flow by the number of screensdesired to obtain maximum flow per screen . The procedure is then asfollows :Maximum daily flow in mgd x 1 .5.47 = maximum daily flow in cfs .Maximum storm flow in mgd x 1 .547 = maximum storm flow in cfs .7-3
Page 5: 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: EM 1110-3-17211 May 847-1 . General
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 and 68: EM 1110-3-17211 May 84RAW14ASTEWATE
Page 69 and 70: EM 1110-3-17211 May 84being wasted
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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