excreta disposal - himsr...deep trench latrine • short-term immediate solution for displaced...
TRANSCRIPT
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Excreta Disposal
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Toilets or Temples?
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Toilets are more important than
Temples
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Toilets before Temples
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Sanitation is more important than Independence
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Ancient Hebrew phrase
Cleanliness is next to Godliness
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Prophet Muhammad PBUH
Cleanliness is half the faith
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Can you imagine not having a toilet? Can you imagine not having privacy when you need to relieve yourself?
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2.5 billion people do not have access to toilets
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600 million people in India defecate in the open
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one in three women worldwide risk shame, disease, harassment
and even attack because they have nowhere safe to go to the
toilet
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WORLD TOILET DAY 19 NOVEMBER
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“We must break the taboos and make sanitation for all
a global development priority.”
Ban Ki Moon
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Sanitation
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Diarrhea is the third leading cause of death of
under-five children
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1.8 million people die annually due to lack of
access to toilets
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Sanitation Barrier
interruption of transmission of the disease agent from the reservoir to the new host segregation of excreta and wastes, protection of water supply, protection of food and drinks, control of flies and the practice of personal hygiene.
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Latrines
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Shallow Trench Latrine
• Trenches 1 foot x 1 foot x 4 meters in length • Advantage – rapid to implement, feces are
covered with soil hence no flies • Constraints- limited privacy, short-life and
space required
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Deep trench latrine
• S h o r t - t e r m i m m e d i a t e so lut ion for d isplaced people or camps of longer duration
• 1 meter wide x 2 meter deep
• 100 people can use for few months
• Advantage- cheap, quick to construct, no water required
• Constraints- unsuitable where water table is high, unstable soi l or rocky ground
• Odor problem
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Simple pit latrine
• 3 meters deep x 75 cm • Undergoes anaerobic digestion • Lasts 5 years for a family of 5 • Advantages – cheap, quick, no water required • Constraints- same as deep trench latrine
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Ventilated Improvised Pit latrine
• Vent pipe is incorporated • Advantage- reduced odor and flies (since
latrine is kept dark) • Constraint- difficult, expensive, time-
consuming
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Borehole latrine
• U s e f u l w h e n l a rg e numbers of latrines are required quickly, where pits are difficult to excavate
• 40 cm x 5-10 m deep
• Undergoes anaerobic digestion
• A d v a n t a g e - q u i c k , suitable in hard ground
• Constraints- drilling equipment required, increases risk of ground water pollution
• Short life span-lasts a family of 5 for 2 years
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Septic tank • Where volume of
wastewater is too large for pit-latrine, b u t s e w e r a g e i s unfavorable
• Cheaper, quicker and easier to construct and maintain than sewerage system
• Anaerobic digestion in septic tank and aerobic digestion of effluent in trenches
• M e t h a n e g a s i s released.
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Chemical toilets
• Uses formaldehyde
• Used in aircrafts, trains
• Short term method –useful in disasters
• Advantage- portable, hygienic, decreased odor and can be mobilized rapidly.
• Constraints- high cost, not sustainable, regular servicing is required.
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Biogas plant • It functions on the
principle of anaerobic d e g r a d a t i o n o f excreta.
• The gas obtained as a by-product is utilized for cooking.
• T h e d i g e s t e d substrate may be utilized as fertilizer
• The biolatrine is an e x a m p l e o f ‘ a p p r o p r i a t e technology’
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Sewage Treatment Stages P
rim
ary Physical
treatment to remove solids S
econ
dar
y Biological treatment by aerobic & anerobic bacteria
Ter
tiar
y Treatment of effluent & sludge
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SCREENING GRIT REMOVAL SEDIMENTATION
Primary treatment
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ACTIVATED SLUDGE PROCESS
SEDIMENTATION
Secondary treatment
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SLUDGE DIGESTION
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EFFLUENT TREATMENT
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Toilet Trivia
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The flushing toilet was invented by Sir John
Harrington in 1596 for Queen Elizabeth I.
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The average person spends three whole
years of their life sitting on the toilet
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Women spend 60% more time in toilet
than men
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The toilet handle in a public restroom can
have up to 40,000 germs per square inch
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An average person uses more than 20,000 sheets of toilet paper
each year
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The cost of toilet in International space
station is $19 million
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