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Presentation for safegard septic tank

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Presentation for safegard septic tank

  1. 1. G. S. Dikondawar GM – Innovation & Technology The Supreme Industries Ltd.
  2. 2. • Introduction • Disadvantages of conventional products • Septic system • Existing system • Problems associated with existing system • Changing factors demanding new solution • Safegard septic tank a) Vertical design b) Modular design • Components of septic tank • Product range • Features and benefits Contents
  3. 3. An Introduction • Sanitation has direct link with the health and the environment • People suffer serious health consequences and millions of people die as a result of lack of effective sanitation • Use of inefficient drainage systems and sewer products are the main reasons. • Advance products/sewerage system has the potential to change the scenario. Developed countries have switched over to advance products. • Plastic Drainage/ Sewer Pipe systems minimize Sanitation risks and improve health and environmental aspects.
  4. 4. Future India…. Three aspects of our current budget focus on: - Total Sanitation is expected to be achieved through Swatchh Bharat Abhiyan by 2019 at a cost of 1000 Cr Rupees. - Allocation of 7060 Cr for the development of 100 Smart Cities which will include Road, Electricity, Water supply and Sanitation. - All Schools to have Toilet facility
  5. 5. Disadvantages of conventional drainage products 1. Heavy weight – 12 times the weight of plastics. Need of heavy equipments, more manpower- more installed cost 2. Cumbersome and time consuming installation 3. Poor resistance to Corrosion 4. Rough internal surface leads to blocks, solid depositions, encrustation and consequent reduction in internal dia and flow 5. Rough bore also leads to more friction, lesser flow or needs higher slope (means more earthwork, costs) 6. Poor resistance to soil movement due to lack of flexibility 7. Cracks and leaks lead to root penetration into the pipe system
  6. 6. Septic System Septic Tankain field /Soak Pit Septic system
  7. 7. • Definition A septic system is a highly efficient, self-contained, underground wastewater treatment system. As septic systems treat and dispose of household wastewater onsite, they are often more economical than centralized sewer systems in rural areas where plot sizes are larger and houses are spaced widely apart. And by using natural processes to treat the wastewater onsite, usually in a homeowner's backyard, septic systems don't require the installation of miles of sewer lines, making them less disruptive to the environment. • Features - Natural waste water treatment - Simple design - Less expensive - Easy for installation & maintenance Septic system
  8. 8. The septic tank is basically a watertight underground tank, the purpose of which is the collection, storage, and to some extent treatment of sewage/effluents. Septic tanks are usually made of concrete or masonry, with an inlet and outlet pipe. Wastewater flows from the home to the septic tank through the sewer pipe. The septic tank treats the wastewater naturally by holding it in the tank long enough for solids and liquids to separate. The wastewater forms three layers inside the tank. Solids lighter than water (such as greases and oils) float to the top forming a layer of scum. Solids heavier than water settle at the bottom of the tank forming a layer of sludge. This leaves a middle layer of partially clarified wastewater. Septic Tank
  9. 9. - Collection of waste water - Retention / holding - Sedimentation / settlement - Anaerobic digestion - Flocculation - Clarification - Discharge Working of Septic Tank
  10. 10. Typical layout of septic system
  11. 11. • Effluent - The supernatant liquid discharge from a septic tank. • Invert - The lowest point of the interior of a sewer or drain at any cross- section. • Scum - The greasy and other substances floating on the surface of sewage. • Septic Tank - A water-tight single storied tank in which sewage is retained sufficiently long to permit sedimentation. • Sewage - The liquid waste of a household or community including human excreta. • Sludge - Sludge is the settled solid matter in semi-solid condition. Terminology
  12. 12. Function of septic tank
  13. 13. a) Drain field The drain field is a network of perforated pipes (or "laterals"). These are laid in gravel- filled trenches or beds. After solids settle in the septic tank, the liquid wastewater or effluent is discharged. This is done either by gravity or pressure, to an absorption field, also known as a drain field or leach field. b) Soak Pit The effluent discharge from the septic tank may contain disease causing germs and pollutants which must be treated to protect human health and environment. Hence these effluents should be carefully and safely disposed either in the drain field or soak pit to facilitate disintegration through bacterial action. Disposal of septic tank effluents
  14. 14. Inner perforated pipe External perforated pipe Septic tank Inlet pipe Outlet pipe Distribution box Gravel filled trench Typical diagram showing drain field
  15. 15. Video for drain field
  16. 16. A soak pit is a covered, porous- walled chamber that allows water to slowly soak into the ground. Effluent from septic tank is discharged to the underground chamber from where it infiltrates into the surrounding soil. Soak Pit
  17. 17. Brick masonry Conventional septic tank
  18. 18. RCC / Hume pipe Existing system
  19. 19. • Leakages • Infiltration • Ex-filtration • Root penetration • Breakages - Insufficient resistance to earth, traffic loads • Corrosion • Insufficient resistance to acids & chemicals • Rough interior surface - deposition & incrustation • Laborious and time consuming installation • Frequent maintenance requirements Diff. problems in conventional septic tanks
  20. 20. • Excess load on septic tank • Improper digestion (decomposition) of solid wastes • Pollution of underground water • Contamination of soil • Unhygienic & harmful for environment • Water born disease & serious health problems • Uncertain & short life span • Fatal accidents • Dryness of septic tank Consequences
  21. 21. • Standard of living/Health consciousness • Nature of sewage • Space constraints • Time constraints • To overcome problems with existing system Factors demanding advance solution
  22. 22. 1. Sufficient area for sludge digestion 2. Holding capacity of waste water (minimum 24 hrs.) 3. Water tight structure 4. Sufficient volume to collect retain & digest solid waste 5. Long cleaning period 6. Easy for maintenance 7. Easy for transportation, handling & installation 8. Excellent performance 9. Better effluent quality (exceeds the standard parameters) 10. Sufficiently strong to sustain different loading condition Design consideration of Safegard septic tank
  23. 23. The surface area of the tank required should be O-92 m² for every 10 liters per minute of peak flow rate at a temperature of 25°. A minimum depth of sedimentation shall be 250 to 300 mm. Sludge digestion per capita suspended solids entering the tank may be taken as 70 g/day. The capacity required for sludge digestion is 0.033 m³ per capita at 25°C. Volume of digested sludge is normally O-000 21 m³ per capita per day. Detention Time provides a detention period of 24 to 48 hours based on an average daily flow of sewage. Requirement of BIS
  24. 24. • Unique Design – Rototationally moulded, one piece seamless construction with two chamber patented design • Great Strength - Highly durable • Light in weight - Simple and quick Installation • Excellent Chemical Resistance - free from concrete corrosion and ill effects of H2S • Minimum space and excavation requirements • Free from infiltration, ex-filtration and root penetration • Long life with economy • Hygienic and safe • Eco-friendly • Conforms to National and International standards • Maintenance free Safegard septic tanks - Unique features
  25. 25. • Available in 1000, 1500, 2000, 3000, 5500 liters and large size up to 29500 liters in modular design. • EN 12566, IS:2470 Available sizes and applicable standards
  26. 26. Vertical design Modular design Diff. designs of Safegard septic tanks
  27. 27. Components of vertical septic tanks
  28. 28. Typical section of vertical septic tank
  29. 29. Functioning of septic tank
  30. 30. 1) EXCAVATION Excavate a pit approximately 600 mm larger than the size of septic tank. Depth of the pit should be decided based on position of inlet and outlet with required gradient and disposal point plus 150 mm extra for bedding. 2) BED PREPARATION Ensure that the base of the pit is even, flat and sufficiently hard to form a strong foundation for the septic tank. Prepare a 150 mm (6”) thick bed of granular material and compact it properly. Ensure that no sharp object/stone etc should protrude which can puncture the tank. Installation of septic tank
  31. 31. 3) POSITIONING THE TANK Lower the tank and position in the pit ensuring that it is vertical, centrally positioned, correctly aligned and leveled using spirit level and the outlet pipe faces the soak pit and inlet pipe swivels, ensuring a straight connection. 4) FILL THE WATER IN THE TANK Fill up the tank with water up to 1/3rd capacity using tap.
  32. 32. 5) BACKFILLING Start the backfilling. Backfilling and water filling should be carried out simultaneously ensuring that the backfilling level never exceeds the rising level of water within the tank until the water overflows through the outlet pipe, thus indicating the tank is full. The width of the backfilling should be minimum 300 mm (12”) around the tank. Excavated soil can be used if it is silt, sand or soft murum but in case of black cotton, loomy or marshy soil only selected inert granular material i.e. sand /stone dust /gravels (max. size 10 mm) should be used as backfill material. Backfill material should be placed in 250 mm thick layers and compacted to 90% proctor density. It is particularly important to note that excavated material consisting of rock, peat or clay is not used as backfill material.
  33. 33. 6) MAKE THE PIPE CONNECTIONS When the level of the backfill reaches the underside of the outlet pipe invert, inlet and outlet connections should be made. It is recommended to maintain 1:40 to 1:60 fall between drain head and inlet of the septic tank. 7) FINAL BACKFILLING After making pipe connections, complete the backfilling up to the top level of the tank. In case of non traffic conditions, normal flooring like PCC / paver blocks etc. can meet the requirements.
  34. 34. 8) PROVIDING COVER / LID Select the appropriate cover as per the site loading conditions and place it on the top of tank. In case of pedestrian movement where vehicular loads are not expected, plastic light weight cover is recommended. This plastic cover should filled with concrete after placing it on the septic tank. For vehicular traffic movement GRP cover of appropriate load class is recommended. For GRP covers 150 mm thick PCC (min. M150 grade) beneath the cover frame for full width of tank is recommended. After embedding the frame, place the cover as shown in the figures.
  35. 35. Components of modular septic tanks
  36. 36. Components of modular septic tanks
  37. 37. Typical diagram of modular tanks for different capacities
  38. 38. Installation of modular tanks 1) Excavation of the pit Excavate a pit approximately 600 mm larger than the size of septic tank. Depth of the pit should be decided based on the position of inlet and outlet with required gradient and disposal point plus 150 mm extra for bedding.
  39. 39. 2) Bed preparation Prepare a 150 mm (6”) thick bed of granular material and compact it properly. Ensure that the base of the pit is smooth and flat. It should be sufficiently hard to form a strong foundation for the septic tank. There should not be any sharp objects/stones etc. which could protrude and puncture the tank. In case of soft strata or loose soil like black cotton, marshy or loamy soil, it is recommended to provide a flat cast in-situ 150 mm thick concrete slab.
  40. 40. 3) Positioning the first component Lower and position the first modular tank component in the pit. Ensure that it is vertical and centrally positioned. Align it correctly and level using spirit level. While positioning ensure that outlet side (having dome end) faces the soak pit or drain field. Cut the hole(s) at provided slot(s) to fit inter connecting pipes as per the requirement and set guidelines given in the following chart. Fix the rubber seals on the holes. Backfill carefully with recommended backfilling material. Ensure that no voids remain especially under and between the legs of the tank to a depth of 400 mm above the bed or cast in situ concrete slab.
  41. 41. 4) Intermediate pipe connections Apply rubber lubricant on the rubber seal(s) provided on the holes cut on the flat portion and insert inter connecting pipes as per the requirements / set guidelines. 5) Push the pipes Push the inter connecting pipes fully inside the first component.
  42. 42. 6) Positioning the second component Lower the second component and align it properly. Cut the slots and place the rubber seal on this second component for connecting it with the first component using connecting pipes. Bring it close to the already positioned first component and match the slots. 7) Alignment of two components Align the holes of two adjoining components, push and insert the connecting pipes from inside the first component as shown in the above figure. Repeat the backfilling as shown in step 3.
  43. 43. 8) Positioning the last component Place the last component in the pit and repeat the same procedure for connecting it with the adjoining middle component. Procedure explained herewith should be repeated for additional intermediate components for increased capacity. 9) Fixing and alignment of last component Align the last component and match with the earlier installed middle component and connect each other using connecting pipes as per the earlier explained procedure.
  44. 44. 10) Fill the tank with water Fill up the tank with water up to 1/3rd capacity using tap before backfilling.
  45. 45. The width of the backfilling should be minimum 300 mm (12”) around the tank. Excavated soil can be used if it is silt, sand or soft murum but in case of black cotton, loomy or marshy soils only selected inert granular material i.e. sand /stone dust /gravels (max. size 10mm) should be used as backfill material. Backfill material should be placed in 250 mm thick layers and compacted to 90% proctor density. It is particularly important to note that excavated material consisting of rock, peat or clay is not used as backfill material. Note - for installation in water logged areas or where the water table is shallower, it is recommended to refer the installation procedure for abnormal condition. 11) Backfilling and compaction Start the backfilling. Backfilling and water filling should be carried out simultaneously ensuring that the backfilling level never exceeds the rising level of water within the tank until the water overflows through the outlet pipe thus indicating the tank is full.
  46. 46. 12) Make the inlet and outlet connections Make the connections of inlet and outlet including hopper. 13) Cast the concrete slab (Optional) and place the cover Complete the backfilling above outlet pipe. Select the appropriate cover solution as per the site loading conditions and place it on the top of tank. In case of pedestrian movement where vehicular loads are not expected, plastic light weight cover is recommended. This plastic cover should filled with concrete after placing it on the septic tank. For vehicular traffic movement GRP cover of appropriate load class is recommended. For GRP covers 150 mm thick PCC (min. M150 grade) beneath the cover frame for full width of tank is recommended. After embedding the frame, place the cover as shown in the figures. Note : If required height of the manhole can be raised using height riser(s).
  47. 47. Cover Solutions for modular septic tanks Typical diagrams should be referred for installation of appropriate covers.
  48. 48. Installation procedure
  49. 49. Installation procedure
  50. 50. Guidelines for abnormal conditions • In case of marshy/black cotton and loose soil, or where the water table is a problem, excavated soil is not recommended for backfilling, a cement-stabilized backfill mix of 5% cement and 95% inert granular material must be compacted in 250 mm layers to 90% proctor density and 6" thick R.C.C. with nominal steel enforcement is recommended at the top. • In case of soft murrum, it can be used as backfilling material with proper compaction (90 % of proctor density), in 150 mm layers. • Care should be taken to avoid direct contact of sharp edges, objects with the tank. • In case of high water table areas, septic tanks should be anchored in concrete as per the guidelines of engineer in charge. • Safegard Septic Tanks are not designed to be buried more than 0.5 m below ground level. If depths are greater than 0.5 m, please refer to site engineer/architect. • If the abnormal soil conditions occur like vehicular traffic, rocks, black cotton soil, or when the high water table is anticipated or when the backfill above the lid may exceeds 0.5 m, then the final design rests with the engineer or architect on the project. However guidelines given herewith must be strictly followed for best satisfactory performance.
  51. 51. Manufacturing – as per EN 12566 Manufacturing standards and test requirements of septic tanks Test Requirements Sr. No. Test Requirement 1 Dimensions Inlets, outlets, and connections Accessibility 2 Load bearing capacity a. Backfill load For vertical - hx18 kN/m² h= height, specific weight of soil 18 kN/m3 b. Hydrostatic load For vertical - Hw x 10 kN/m² specific load of soil / specific mass of water 10 kN/m3 c. Dynamic load i) Pedestrian Load For less than 1m = 2.5kN/m² ii) Vehicle Load 3 Water tightness a. Water test No leakage b. Air permeability vacuum test 0.1 bar for 60 sec, 0.2 bar for 30 sec, 0.3 bar for 15 sec c. Pneumatic pressure test 0.3 bar for 3 min
  52. 52. 4 Volume / Nominal Capacity test Septic tank capacity recorded in liters 5 Structural behaviour a. Dry conditions Vertical load test - hx18 KN/m² h= height, specific weight of soil 18 KN/m3 Determination of mechanical characteristics of test samples used for calculations (flexural modulus) Pit Test Determination of mechanical characteristics of test samples used for calculations (flexural modulus) Pit Test
  53. 53. Volume of tank = Volume for sludge + Volume for retained water + freeboard For example, a) Volume of sludge / person / year = 27 liters. b) Water supply / person / day = 80 liters. c) Average population of a household = 5 nos. d) Cleaning period = 5 years. e) Volume required for sludge = (a x c x d) = (27x5x5) = 675 liters a) Volume of water retained in the tank in 24 h = ((b x 0.8) x 5) = ((80 x 0.8) x 5) = 320 liters. = (e + f) = 675 + 320 = 995 liters say 1000 liters. Summary – for 80 lpcd, 5 people & 5 years use 1000 liters septic tank is required. In addition to 1000 liters capacity a freeboard of 250 mm is required. Capacity calculations
  54. 54. Comparison with Hume pipe construction
  55. 55. Comparison with Safegard septic tank Manufactures claim • Total capacity - 2800 ltrs. • Capacity up to liquid level - 2490 ltrs. • Recommended no of users – 50 Suitable for • Sludge volume per users / year - 27 ltrs. • Sludge volume for 50 users / year - 1350 ltrs. • Volume for waste water to be retained - 4800 ltrs. • Free board required - 310 ltrs. min. • Total volume for 50 Users for one year - 6460 ltrs. • Available capacity is - 2800 ltrs. Summary • Thus this tanks is suitable only for 20 users for one year it means Safegard 3000 liters tank is suitable. • Cost of this tank is Rs.18000 against Rs. 36000/-
  56. 56. Life cycle cost analysis Description RCC Septic Tank Safegard Septic Tank Life Product Cost Maintenance Cost Total Cost with Conventional Product 15 - 20 Years Rs.18,000/- Rs.12,000/- (20 Yrs.) @ Rs.600/year 18,000 + 12,000 = Rs.30,000/- 30,000/20 = 1,500 Rs./Year 80 Years Rs.36,000/- Rs.32,000/- (80 Yrs.) @ Rs.400/year 36,000 + 32,000 = Rs.68,000/- 68,000/80 = 850 Rs./Year
  57. 57. Comparison Summary Sr. No. RCC Hume pipe Suggested size of Safegard in L Cleaning time (1 year) Cost Life cycle cost per yearTank size in L Recommend ed for no of user / tank Actually suitable for 1 year RCC Safegard RCC Safegard 1 1600 25 12 users 1500 9000 18000 650 225 2 2800 50 22 users 3000 18000 36000 1194 450 3 6300 100 48 users 5500 35000 66000 2155 825
  58. 58. Advantages of Vertical v/s Horizontal design • Minimum space requirement • Minimum external loads • Better settlement and decomposition of soil waste • Better quality of effluent discharge • Economical design
  59. 59. Different Tests on Septic tanks • Material properties • Vacuum test • Structural behavior - Collapse load • Dynamic load test • Water tightness test • Pneumatic pressure test • Hydraulic efficiency test
  60. 60. Water storage solution . . . Total water storage solution provider • SILTANK overhead water storage and loft tanks in different capacities from 100 to 5000 liters • Amrutam underground water storage tanks in different capacities from
  61. 61. Overhead Water Tanks … Strong, Sturdy and Long Lasting tanks
  62. 62. Unique features of Overhead water tank • 100% virgin raw material • Strong and Durable • Thermal Insulation with foam layer (four layered) • Excellent chemical resistance • Meets and exceed all quality parameters as specified in IS standard • BIS marked two layer tanks are also available • UV Stability • Full capacity guaranteed • Most suitable for drinking water • Easy and quick installation • Available in 500, 750, 1000, 1500, 2000, 3000 and 5000 liters • Two cover options – one with simple rotate and lock type and other with threaded type covers
  63. 63. Overhead water tank sizes with dimensions CAPACITY Available Layers Diameter Height Manhole ID 500 liters 2/3/4 868 1060 390 750 liters 2/3/4 1000 1168 390 1000 liters 2/3/4 1071 1325 390 1500 Liters 2/3/4 1267 1454 390 2000 Liters 2/3/4 1434 1503 460 3000 Liters 2/3 1611 1733 460 5000 Liters 2/3 1936 2047 460 All dimensions are in mm
  64. 64. Loft Tanks … Strong, Sturdy and Long Lasting tanks
  65. 65. • 100% virgin raw material • Food grade material • Strong and Durable • Full capacity guaranteed • Most suitable for drinking water • Net storage capacity exceeds the mentioned capacity • Easy and quick installation • Available in 100, 150, 200, 300, 400 and 500 liters Unique features of loft tanks
  66. 66. CAPACITY Length Width Height Manhole ID 100 liters 585 585 373.0 300 150 liters 715 715 371.0 300 200 liters 900 500 475.0 300 • Liters 965 705 385.0 300 300 Liters 1205 825 378 300 400 Liters (Option 1) 1195 920 450 300 400 Liters (Option 2) 1290 1004 390 300 500 Liters (Option 1)* 1415 870 490 300 500 Liters (Option 2)* 1505 996 408 300 * Two openings with lid , all dimensions are in mm Dimensional details of loft tanks
  67. 67. Underground Water Tanks Available in 1000, 1500, 2000,3000 liters in vertical design and 6000 and bigger capacities up to 30000 liters in modular design
  68. 68. Unique features of Amrutam underground water tank• Rotational moulded single piece construction up to 3000 liters • Great strength – Robustly designed with unique rib structure • Simple and quick installation • 100% water tight – free from root penetration • Provided with air tight threaded cover • Hygienic and safe – free from corrosion and biological growth • Minimum maintenance requirements • 100% virgin raw material • Full capacity guaranteed • Long life – minimum 50 years of service life • Available in 1000 to 30000 liters capacity in vertical and modular design
  69. 69. Amrutam vertical tank sizes with dimensions CAPACITY Diameter Height Manhole ID 1000 Liters 1200 1321 390 1500 Liters 1200 1692 390 1800 Liters 1200 2052 390 2000 Liters 1700 1301 390 3000 Liters 1700 1748 390 All dimensions are in mm
  70. 70. Amrutam modular tank sizes with dimensions CAPACITY Diameter Length 6000 Liters 2200 2400 10000 Liters 2200 3800 14000 Liters 2200 5200 18000 Liters 2200 6600 22000 Liters 2200 8000 26000 Liters 2200 9400 30000 Liters 2200 10800 All dimensions are in mm
  71. 71. Thank you…

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