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SANITARY ENGINEERING • Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

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Page 1: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

SANITARY ENGINEERING

• Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

Page 2: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

Definitions• Refuse: Any waste matter lest as waste or worthless• Sewage: includes all types of liquid wastes from latrines

urinals, storm water, industrial wastes etc…• Sullage: Liquid discharge from bathrooms, kitchens,

wash basins etc…• Garbage: Dry refuse including decayed fruits, leaves,

paper pieces• Sewer: closed drain through which drainage is

conveyed• Chemical oxygen demand: the amount of oxygen

required to oxidize (chemically decompose) the given quantity of sewage is called COD

• Bio chemical oxygen demand: the amount of oxygen required for biological decomposition of waste matter

Page 3: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

SEPTIC TANK• Water tight single storied sedimentation tank where

the sewage undergoes anaerobic decomposition

BIOLOGICAL ACTION• Sewage is retained for specific period- suspended

solids settle down – sludge• Sludge and the liquid undergo anaerobic

decomposition – gets digested and reduces itself – sludge formed is removed at frequent intervals – effluent treated properly – either to soak pit or dispersion trenches

• Grease and fat rise to the surface of the sewage as scum

Page 4: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

DESIGN ASPECTS• For treatment of human excreta and urine• Minimum diameter of pipes – 100 mm• Volume septic tank depends on quantity of flow and

the detention period• Detention period – 24 hours ( may vary from 12-72

hours )• Rectangular in shape – length is usually 2-4times

breadth• Grease, detergents, disinfectants- should not be

allowed to the tank• Minimum free board is 300mm

Page 5: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

Construction details• Two compartments- seperated by baffle walls• Rectangular tank with brick or concrete• Brick walls – 200mm, Concrete walls – 150 mm• Plastering – 12 mm thick ( 1:3)• Flooring – M15 concrete; 1:10 slope towards

sludge outlet• RCC or cast iron covers are provided over the

tank• Ventilation pipes – 50mm dia., taken to a height

of 2m minimum, covered with mosquito nets

Page 6: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 7: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 8: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 9: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 10: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

SEPTIC DON’TS

• Eliminate anti-bacterial cleaners.

• Don’t use detergent with bleach.

• Don’t do excessive cold water washing.

• Septic tank bacteria needs a warm climate.

• No water softeners into tank.

Page 11: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

SOAK PIT• Effluent from septic tank – fed to soak pit• Soil absorption method• Liquid effluent- soaks the soil• Covered pit• Rectangular in shape• Minimum lateral dimension -atleast 1 m• Filling-brick bats or broken stones• Lining above inlet level is plastered• Pit is covered with RCC slab

Page 12: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 13: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 14: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

DISPERSION TRENCH• Trenches of depth 50 to 100 cm and 30 to

100 cm excavated to a slight gradient

• Bottom layer – washed gravel / crushed stone

• Rest layers – coarse aggregates

• Length of trench - 30 m with a min. spacing of 1.8 m

• Covered with ordinary soil and the top surface is turfed ( 15 cm above ground level)

Page 15: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste
Page 16: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

• Water is our most precious resource.• We can live without oil or gas• We cannot survive without clean and safe water

Page 17: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste

concerns

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Page 19: SANITARY ENGINEERING Planning, designing and installation of system for the collection, conveyance, treatment and disposal of the waste