Domestic Wastewater Treatment Mobilization Construction - AskTOP

More documents

Recommendations

Info

EM 1110-3-17211 May 84such as chain-and-flight types may be used for larger installations .To minimize the accumulation of sludge film on the sides of the sludgehoppers, a side slope of at least 1-1/2 vertical to 1 horizontal willbe used . Separate sludge wells, into which sludge is deposited fromthe sludge hoppers and from which the sludge is pumped, are preferableto direct pump connections with the hoppers .c . Circular tanks . Circular tank diameters range from 25 to 150feet . Side-water depths are 7 feet as a minimum, and tank floors aredeeper at the center . Adjustable overflow weirs (V-notch type) willextend around the entire periphery of the tank . Scum baffles,extending down to 6 inches below water surface, will be provided aheadof the overflow weir, and the distance betwen scum collection troughswill not exceed 75 feet along the periphery of the clarifier . Circularsludge-removal mechanisms with peripheral speeds of 5 to 8 fpm will beprovided for sludge collection at the center of the tank .8-5 . Imhoff tanks . The removal of settleable solids can also beaccomplished through the use of Imhoff tanks . Imhoff tanks are simpleto operate and do not require highly skilled supervision . There is nomechanical equipment to maintain . Imhoff tanks contain twocompartments whereby settling takes place in the upper compartment andsludge digestion occurs in the lower compartment . Therefore, theImhoff process is a bi-functional process . Settling solids dropthrough slots into the lower compartment for digestion . The slots aretrapped such that gas escaping from the digester zone passes throughgas vents but does not filter back through the sedimentation zone . Ifthis gas is not vented around the sedimentation zone, settlingcharacteristics would be disrupted . The settling compartments of-Imhoff tanks are normally designed for a surface overflow rate of 600gpd/square foot at the average rate of flow . Detention times aregenerally around 2 .5 to 3 hours . Average velocities through thesettling chamber should not exceed 15 inches per minute . The slot thatpermits solids to pass through to the digestion compartment will have aminimum opening of 6 inches . For more information on the sludgedigestion process of the Imhoff tank, refer to paragraph 12-3 .b .(5) ofthis manual .8-6 . Sludge characteristics . Table 8-3 represents typicalcharacteristics of domestic sewage sludge .
EM 1110-3-17211 May 84Table 8-3 .Typical Characteristics of <strong>Domestic</strong> Sewage SludgeSolids ContentOrigin of Sludge of Wet Sludgel Dry Solids 2percent pounds/day/capita-Primary Settling Tank 6 0 .12Trickling FilterSecondary 4 0 .04Mixed Primary andTrickling FilterSecondary 5 0 .16Conventional ActivatedSludge Secondary 0 .5-1 0 .07Mixed Primary andConventional ActivatedSludge Secondary 2-3 0 .19Extended AerationSecondary 2 0 .02IValues based on removal efficiencies of well-operatedtreatment processes .2Average 24-hour values . To estimate maximum 24-hour values,multiply given values by ratio of maximum 24-hour flow toaverage 24-hour flow .U . S . Army Corps of Engineers
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 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: EM 1110-3-17211 May 84(2) Weir rate
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
show all

Domestic Wastewater Treatment Mobilization Construction - AskTOP

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?