Enbiolet is the trade name of unique aerobic bio toilet designed & developed by Stone India Ltd.

1. ENBIOLET
TECHNOLOGY
ENBIOLET-the Environment Friendly Aerobic
Bio-toilet.

2. ENBIOLET……..WORKING PRINCIPLE:
ENBIOLET is a Biological toilet system in which the Human Waste, the fecal matter is
converted into non toxic neutral water and traces of CO2 within a purposefully built
patented bio digester tank by the action of multi strain aerobic bacterial culture. The
water thus generated is disinfected before it leaves the bio-digester tank and reaches the
environment.
UNIQUENESS OF AEROBIC BIO-TOILET:
 100% treatment of solid human waste, as per SBM guidelines 2014;
 Odor free and does not produce any foul smell;
 Completely Environment & user friendly as it does not emits Methane & Hydrogen
sulphide gas;
 Uses multi strain aerobic bacterial culture to clean human waste;
 Water positive solution as it generates neutral water;
 Prevents soil pollution from open feces discharge;
 Preserves ground water quality caused by leaching of human waste;
 Controls the spread of fecal transmitted diseases: diarrhea , amoebic dysentery,
cholera, etc.

3. COMPOSITION OF HUMAN FECAL MATTER
Utilized by bacteria to obtain
energy:
C+O2  CO2+ energy
2H+1/2O2  H2O + energy
CO2(Traces) & H2O released
Utilized by bacteria:
Nitrogen forms major
component of DNA of
new forming bacteria;
P, Ca & Sulphur are
used as micronutrients

4. THE TECHNOLOGY:
Bacteria, like all living things, require food for growth. Human solid waste provides a
good source of readily available food to them.
Aerobic bacteria digests the solid waste containing organic matter like carbon, nitrogen,
hydrogen, etc for obtaining energy.
 The end product of the process is carbon dioxide (CO2) and water (H2O).
Solid waste in bio digester tank
(Contains carbon, nitrogen,
hydrogen and organic matter)
AEROBIC BACTERIAL
DIGESTION
Production of Carbon di oxide,
Water & Energy
ENERGY
Utilized by BacteriaNew bacterial cells REPRODUCTION

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6. THE BIO-DIGESTOR TANK:

7. TECHNICAL FEATURES OF BIO-MEDIA:
 Multi strain bacterial mixture;
 Consists of aerobic & facultative bacteria's: able to grow under aerobic
(presence of O2) as well as anaerobic (absence of
O2)conditions but mostly prefer to grow
rapidly in an aerobic environment;
 Aerobic respiration generates more energy (in form of ATPs) as compared
to anaerobic respiration;
 Can form endospore in stressed condition and revive to vegetative state
on getting favorable environmental condition(food, water, O2)
 Endospore can survive up to 2 years under controlled condition;

9. BIO
TOILETS
TYPES

10. THERE ARE BASICALLY TWO TYPES OF BIO TOILETS
BASED ON TECHNOLOGY USAGE:
1.Aerobic Bio-Toilet: involves the aerobic bacteria which feeds
upon the fecal matter inside the tank, under aerobic bio digestion
process and finally degrades the matter into neutral water and traces
of CO2.
2.Anaerobic Bio-Toilet: involves the anaerobic bacteria which
feeds upon the fecal matter inside the tank, through an anaerobic
process which finally releases methane gas and treated water.

11. AEROBIC
BIO TOILETS
ADVANTAGE
S

12.  Aerobic bio-toilets uses multi strain aerobic bacterial culture where as anaerobic
biological toilet uses single strain bacteria culture.
 Anaerobic bio digestion is extremely slow process while aerobic digestion
completes within 24hours;
 Aerobic bio digestion generates neutral water & only traces of CO2. Anaerobic bio
digestion generates large volumes of Methane, which is a greenhouse gas and
emission is banned globally.
 Anaerobic bio digestion generates huge volumes of sludge as digestion is not
complete while no sludge remains from aerobic bio digestion;
 Aerobic Bio toilets require a very small volume of bacterial culture for charging
while half of the tank of anaerobic bio toilet needs to be filled with bacteria.
 Aerobic Bio digester tank size is nearly half in size of Anaerobic tank.
 Aerobic bacteria is freely available in nature; easy to propagate and store.

13. DIFFERENCES BETWEEN AEROBIC BIOTOILET AND
SEPTIC TANK SYSTEM:
SL.NO SEPTIC TANK SYSTEM AEROBIC BIOTOILET
1. The wastes in the septic tank are not
digested and it seeps into the ground; may
contaminate ground water leading to an
epidemic.
The wastes from the toilet are digested by the
bio media resulting in neutral water and gas.
2. Large floor area required almost twice that
of the Bio digester tank
Less floor space required as the Bio digester
tank is small in size.
3. Septic tank requires excavation, cementing,
curing, partitioning, etc. So, it is a labour
intensive and time consuming process and
installation is slow. Its permanent structure.
The Bio digester tank can be placed on the
ground, so no digging or foundation required,
so installation is fast and also portable in
nature.
4. This system requires periodic sludge
removal which may lead to waste spillage
on the ground resulting in unhygienic
conditions and diseases.
This system requires less maintenance and does
not require periodic sludge removal as the
wastes are converted into water.

14. DIFFERENCES BETWEEN AEROBIC BIOTOILET AND
LEACH PIT SYSTEM:
SL.NO LEACH PIT SYSTEM AEROBIC BIOTOILET
1. A large ground area is required to construct
a Pit away from the toilet;
Very little ground area is required, as there is a
single Bio digester Tank, which is constructed
below the toilet room;
2. Needs to be evacuated every three years
and there are chances of overflow.
Does not need evacuation as the solid wastes
are converted to water;
3. A pit once filled up requires a rest period of
2-3 years before it can be desludged; a new
pit have to be dug again-wastage of land
and resources ;
No rest period is required in EnbioletTM
, as the
digestion process is a continuous ongoing
process and starts in 3 hours
4. The sludge has to be removed manually or
mechanically, which may come in contact
with the people handling the waste, it is
unhygienic and may cause diseases.
No sludge removal, so no chances of people
coming in contact with wastes. So it is much
more hygienic and safe.
5. To prevent pollution of drinking water
sources, the pit should be 3 to 10 meters
from the water source. This is a health
hazard and requires idle stretches of land.
No chances of pollution of drinking water
sources from the Bio digester Tank, as the
effluent is non contaminating and non
pathogenic.

15. DIFFERENCES BETWEEN AEROBIC BIOTOILET AND
COMPOSTING TOILETS:
SL.NO COMPOSTING TOILETS AEROBIC BIOTOILET
1. Originally conceived as waterless systems, composting
toilets have no water seal incorporated and have been
reported to have foul odour and flies;
All Enbiolet installations are water-sealed and therefore
effectively control the spread of odour and vectors
2. Composting toilets have effluent accumulation at the base
of the unit in the evaporation chamber which is often a
mix of both fecal sludge and bulking materials releasing
foul odour;
As a sealed system, the water-seal and vent pipe integrated
into the design of the tank of most units control the passage of
flies and insects and controls odour.
3. Wastewater overflows outside the compost tray; No overflow of liquid occurs. The effluent water originates after
the solids undergo bacterial digestion in the first chamber
and gets discharged from last chamber.
4. Users are required to pour bulking material after each
defecation, rotate the handle & monitor daily.
Its difficult to handle rotation, frequent emptying and user
numbers is limited to 1-4 people.
Regular cleaning and periodic maintenance is required for
Enbiolet, especially weekly Bio-media charging & fortnight
disinfection. User no. ranges from 20-30 times usage per day
5. It is suggested for compost removal at the end of 6 months
of regular use but rapid filling up of drum contents and
liquid overflow outside the digester in less than 2 months,
leads to the emptying/cleaning of drum contents rapidly;
Enbiolet technology is free of producing compost and promotes
solid waste reduction.

16. ACCREDATIONS:
• Technology approved by Ministry of Science & Technology,
Bill & Melinda Gates Foundation;
• Technology endorsed by Swachh Bharat Mission Urban
guidelines 2014;
• Technology partner with Rotary International for
implementing “WASH” in school projects;
• Also features in Ministry of Drinking water & Sanitation
website;
• CII Smart City approved Technology for Solid waste
management;
• Featured as validated sanitation Technology on website of
Ministry of Urban Development;

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19. Community Biotoilet- Kerala
Ganga Sagar Fair Shrawani Mela, Deoghar
Uttarakhand Boys toilet block at Rotary School,
Rampara Medica Specialty Hospital EM Bypasss
Hazaribagh & Lohardanga
Digha Beach, W.B
Executive
Executive Sleek
Barmer, Rajasthan World Vision, Eco Park, New Ongole Station
Delhi Development Authority Park
World Vision,
Deluxe
Biotoilet at L & T construction
site

20. THANK YOU
MOUMITA KARMAKAR
STONE INDIA LTD.