On-Site Wastewater Treatment and Disposal Systems - Forced ...

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GLOSSARY A horizon: The horizon formed at or near the surface, but within the mineral soil, having properties that reflect the influence of accu- mulating organic matter or eluviation, alone or in combination. absorption: The process by which one substance is taken into and in- cluded within another substance, as the absorption of water by soil or nutrients by plants. activated sludge process: A biological wastewater treatment process in which a mixture of wastewater and activated sludge is agitated and aerated. The activated sludge is subsequently separated from the treated wastewater (mixed liquor) by sedimentation and wasted or returned to the process as needed. adsorption: The increased concentration of molecules or ions at a surface, including exchangeable cations and anions on soil particles. aerobic: (1) Having molecular oxygen as a part of the environment. (2) Growing or occurring only in the presence of molecular oxygen, such as aerobic organisms. aggregate, soil: A group of soil particles cohering so as to behave me- chanically as a unit. anaerobic: (1) The absence of molecular oxygen. (2) Growing in the absence of molecular oxygen (such as anaerobic bacteria). anaerobic contact process: An anaerobic waste treatment process in which the microorganisms responsible for waste stabilization are removed from the treated effluent stream by sedimentation or other means, and held in or returned to the process to enhance the rate of treatment. angstrom (ij): one hundred millionth of a centimeter. B horizon: The horizon immediately beneath the A horizon characterized by a higher colloid (clay or humus) content, or by a darker or brighter color than the soil immediately above or below, the color usually being associated with the colloidal materials. The colloids may be of alluvial origin, as clay or humus; they may have been formed in place (clays, including sesquioxides); or they may have been derived from a texturally layered parent material. 382
iochemical oxygen demand (BOD): Measure of the concentration of organic impurities in wastewater. The amount of oxygen required by bacteria while stabilizing organic matter under aerobic conditions, expressed in mg/l, is determined entirely by the availability of material in the wastewater to be used as biological food, and by the amount of oxygen utilized by the microorganisms during oxidation. blackwater: Liquid and solid human body waste and the carriage waters generated ,through toilet usage. bulk density, soil: The mass of dry soil per unit bulk volume. The bulk volume is determined before drying to constant weight at 105°C. C horizon: The horizon that normally lies beneath the B horizon but may lie beneath the A horizon, where the only significant change caused by soil development is an increase in organic matter, which produces an A horizon. In concept, the C horizon is unaltered or slightly altered parent material. calcareous soil: Soil containing sufficient calcium carbonate (often with magnesium carbonate) to effervesce visibly when treated with cold O.lN hydrochloric acid. capillary attraction: A liquid's movement over, or retention by, a solid surface, due to the interaction of adhesive and cohesive forces. cation exchange: The interchange between a cation in solution and another cation on the surface of any surface-active material, such as clay or organic colloids. cation-exchange capacity: The sum total of exchangeable cations that a soil can adsorb; sometimes called total-exchange, base-exchange capacity, or cation-adsorption capacity. Expressed in milliequiva- lents per 100 grams or per gram of soil (or of other exchanges, such as clay). chemical oxygen demand (COD): A measure of the oxygen equivalent of that portion of organic matter that is susceptible to oxidation by a strong chemical oxidizing agent. chlorine residual: The total amount of chlorine (combined and free available chlorine) remaining in water, sewage, or industrial wastes at the end of a specified contact period following chlorination. clarifiers: Settling tanks. The purpose of a clarifier is to remove settleable solids by gravity, or colloidal solids by coagulation 383
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DE SIGN MANUAL WASTEWATER TREATMENT
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FOREWORD Rural and suburban communi
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Chapter CONTENTS Page FOREWORD ACKN
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Number FIGURES Wastewater Managemen
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FIGURES Number Page ne Saturator Sa
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FIGURES Number Page Use of Metal Ho
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Number TABLES Selection of Disposal
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Number TABLES (continued) Operati o
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TABLES (continued) Number Page of D
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In many areas, onsite systems have
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2.1 Introduction CHAPTER 2 STRATEGY
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subsurface soil absorption is the p
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features of the site (See 3.3.1 and
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2.2.2 System Selection With the pot
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2.2.4 Onsite System Management Past
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determined largely by the physical
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16 - I ,
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Step Client Contact Preliminary Eva
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FIGURE 3-2 EXAMPLE OF A PORTION OF
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Property USDA Texture Flooding Dept
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TABLE 3-3 SOIL SURVEY REPORT INFORM
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found for a subsurface soil absorpt
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Instrument Supported - Abney Level:
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FIGURE 3-8 PREPARATION OF SOIL SAMP
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Sandy Loam + _. ,i . L Silt Loam Cl
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Depth (Ft.) 0 2 4 6 8 10 12 14 Text
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Grade Structureless Weak Moderate S
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Excavated Soil Material (Tamped in
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If test results agree with this tab
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Percolation test FIGURE 3-15 PERCOL
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mm..--- - --- FIGURE 3-16 COMPILATI
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FIGURE 3-16 (continued) 0 Texture S
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13. Winneberger, J. T. Correlation
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is the overall socioeconomic status
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FIGURE 4-l FREQUENCY DISTRIBUTION F
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extreme, however, minimum and maxim
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4i2.2.2 Individual Activity Contrib
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and the resultant wastewater charac
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TABLE 4-7 TYPICAL WASTEWATER FLOWS
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TABLE 4-9 FIXTURE-UNITS PER FIXTURE
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4.3.2 Wastewater Quality The qualit
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* FIGURE 4-3 STRATEGY FOR PREDICTIN
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12. Witt, M. Water Use in Rural Hom
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5.2 Water Conservation and Wastewat
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5.2.2 Water-Saving Devices, Fixture
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TABLE 5-2 (continued) Total Flo Red
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Generic Typea Description Pit Privy
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TABLE 5-4 WASTEWATER FLOW REDUCTION
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5.2.2.3 Clotheswashing Devices and
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Generic Typea Description Mixing Va
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TABLE 5-6 WASTEWATER FLOW REDUCTION
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TABLE 5-7 EXAMPLE POLLUTANT MASS RE
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FIGURE 5-l EXAMPLE STRATEGIES FOR M
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In most situations, projections of
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FIGURE 5-3 FLOW REDUCTION EFFECTS O
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5.7 References 1. 2. 3. 4. 5. 6. 7.
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6.1 Introduction CHAPTER 6 ONSITE T
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l SauJUOdtUo3 lesodsip pue JuJmeJJa
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.aJn7eJal k L aqq u k pays k Lqeasa
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9-9 37flVl pSil3111~ lN311IbWl1NI 3
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‘8 Jaad&?ys ul pun04 aJle suoyd!s
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‘SU !PJpJapun paaeJo4Jad JO aukoF
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a3ueua2ukew pue uobJeJad0 8.E.g LeJ
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sameualJnddv axanbas Jau il SLOJ7.t
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eJJaakJ3 u6isaa Z’6’E’g *asop
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318QaQEi33aNON 01-9 3msu simaotld N
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SNOIlQ~tl9I~N03 1NQld 39QI3Qd NOIlQ
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El-9 31av1 S3ItX-US 01313 1INt-l 31
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d. Method of Aeration Oxygen is tra
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contain electrical components, they
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control that results in power savin
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TABLE 6-16 OPERATIONAL PROBLEMS--EX
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I TRICKLING FILTFR FIGURE 6-12 EXAM
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presents suggested design ranges fo
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Item Media Tank Aeration System RBC
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Observation Filter Ponding Filter F
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TABLE.6-21 HALOGEN PROPERTIES (27)
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The use of chlorine as a disinfecta
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HOC1 , would predominate. It is cle
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6.5.2.5 Construction Features a. Fe
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e Wastewater FIGURE 6-14 IODINE SAT
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(experience with some units indicat
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directing flow through and around t
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FIGURE 6-17 TYPICAL UV STERILIZING
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Shigella TABLE 6-25 UV DOSAGE FOR S
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Cleaning of quartz glass enclosures
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the bubble diffuser units to lo-30
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TABLE 6-26 POTENTIAL ONSITE NITROGE
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Nitrification of septic tank efflue
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Influe? Effluent 0 Tank Denitrifica
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solution. It can be used to remove
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TABLE 6-27 POTENTIAL ONSITE PHOSPHO
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Anionic polyelectrolytes can be use
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component of the onsite treatment s
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7. 8. 9. 10. 11. 12. 13. 14. 15. 16
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30. 31. 32. 33. 34. 35. 36. 37. 38.
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58. 59. 60. 61. 62. 63. 64. 65. 66.
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7.1 Introduction CHAPTER 7 DISPOSAL
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7.2.1.2 System Selection The type o
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Distribution FIGURE 7-2 TYPICAL BED
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TABLE 7-l SITE CRITERIA FOR TRENCH
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TABLE 7-2 RECOMMENDED RATES OF WAST
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can slough off the sidewall. These
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FIGURE 7-3 ALTERNATING TRENCH SYSTE
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FIGURE 7-4 PROVISION OF A RESERVE A
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FIGURE 7-5 TRENCH SYSTEM INSTALLED
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TABLE 7-4 DOSING FREQUENCIES FOR VA
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The depth of the porous media may v
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Distr Pipe, FIGURE 7-6 TYPICAL INSP
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against freezing and to stabilize .
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Pertodic Deternvne Cause u O&loadin
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oils, and greases, can cause failur
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4" Inspection Pip FIGURE 7-9 SEEPAG
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The same guidelines used in locatin
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Straw, Hay or Fabric? FIGURE 7-10 T
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I tern Landscape Position Slope Typ
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The acceptable depth to an impermea
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FIGURE 7-12 PROPER ORIENTATION OF A
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Mound Height TABLE 7-9 DIMENSIONS F
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Example 7.1: Calculation of Mound D
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1.0 + 1.4 = - t 0.75 + 1.5 1 [ = (3
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. Fill Placement Step 1: Place the
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7.2.4.6 Considerations for Multi-Ho
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7.2.5.2 Application a. Site Conside
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7.2.6 Artificially Drained Systems
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---- FIGURE 7-17 UNDERDRAINS USED T
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periods, particularly on level site
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TABLE 7-11 DRAINAGE METHODS FOR VAR
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high water table elevation. To prev
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FIGURE 7-18 TYPICAL ELECTRO-OSMOSIS
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7.2.8.1 Design a. Single Line . Sin
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Inlet From Pretreatment or Previous
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watertight Pipe & Joints1 FIGURE 7-
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ox networks (see Figure 7-23). Howe
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280 s P 4
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FIGURE 7-26 LATERAL DETAIL - TEE TO
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To simplify the design of small pre
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FIGURE 7-29 RECOMMENDED MANIFOLD DI
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Step 3: Select lateral diameter. Fo
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Step 8: Select proper pump or sipho
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Friction loss in 25 ft 2. Velocity
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FIGURE 7-32 DISTRIBUTION NETWORK FO
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In summary, the final network desig
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7.2.8.3 Construction FIGURE 7-33 SC
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Since the network is pressurized, s
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FIGURE 7-35 CROSS SECTION OF TYPICA
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The capillary rise characteristic o
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The hydraulic loading rate is deter
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during the critical months of the y
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7.3.3 Evaporation and Evaporation/I
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FIGURE 7-37 TYPICAL EVAPORATION/INF
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October November December January F
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7.3.3.7 Seasonal, Multifamily, and
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13. 14. 15. 16. 17. 18. 19. 20. 21.
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38. 39. 40. 41. 42. 43. 44. 45. 46.
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The grease traps discussed here are
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Type of Fixture Restaurant kitchen
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Removable Slab Inlet --CL Tee with
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- 8.3.3 Factors Affecting Performan
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The pumping head is calculated by a
Page 350 and 351: liquid level drops, the weights los
Page 352 and 353: 8.3.5 Construction The tank must be
Page 354 and 355: Hori FIGURE 8-6 TOP VIEW OF DIVERSI
Page 356 and 357: 9.1 Introduction CHAPTER 9 RESIDUAL
Page 358 and 359: Parameter TABLE 9-2 CHARACTERISTICS
Page 360 and 361: Parameter Total Coliform Fecal Coli
Page 362 and 363: 9.4.1 Land Disposal Four methods ca
Page 364 and 365: TABLE 9-4 (continued) Alternative D
Page 366 and 367: W z Process Lagooning (1)(13)(14) (
Page 368 and 369: Process Description Liouid Stream S
Page 370 and 371: 11. 12. 13. 14. 15. 16. 17. 18. 19.
Page 372 and 373: Some of the techniques discussed ma
Page 374 and 375: 10.3.1 State Agencies Except for th
Page 376 and 377: 10.3.4.1 Private Nonprofit Institut
Page 378 and 379: 10.4.1.1 Standards for Site Suitabi
Page 380 and 381: Scope of Activities Perform inspect
Page 382 and 383: Scope of Activities Perform necessa
Page 384 and 385: 10.4.4.1 Inspections Inspections co
Page 386 and 387: SYSTEM 1. U.S. Bureau of Reclam$t~o
Page 388 and 389: FIGURE A-2 TEXTURAL TRIANGLE DEFINI
Page 390 and 391: Class Platelike. with one dimension
Page 392 and 393: saturation may be necessary to conf
Page 394 and 395: the porosity of soils containing mo
Page 396 and 397: FIGURE A-5 SOIL MOISTURE RETENTION
Page 398 and 399: A.3.3 Flow of Water Through Layered
Page 402 and 403: following chemical flocculation; wi
Page 404 and 405: floodway: A channel built to carry
Page 406 and 407: ped: A unit of soil structure such
Page 408 and 409: solids: Material in the solid state
Page 410 and 411: TECHNICAL REPORT DATA (Please read
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