dewats decentralised natural waste water treatment system
DESCRIPTION
Natural treatment for waste/grey waterTRANSCRIPT
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Decentralised waste water treatment systemsDecentralised waste water treatment systemsAuroville Centre for Scientific Research
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Decentralised waste water treatment principles and devices
Treatment for organic wastewater from domestic and industrial sources
Treatment of wastewater flows from 1-1000 m3/d
Achievement of discharge standards
Tolerance to inflow fluctuationMinimal dependence on external energy, minimal maintenance
Using gravity instead of pumps, avoiding valves
Aiming towards reliable and long-lasting devices
Priority given to anaerobic technology in warm climatesand aerobic technology in cold climates
Reuse of wastewater
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Pre-treatment deviceSettler
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Pre-treatment
Settler
1st treatment
Baffled tank reactor
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Anaerobic filter
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD
457
0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
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Planted gravel filter
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Polishing pond
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Pre-treatment is done in a Settler
A device which separates the liquid from the solid, retention time is only 2 hours. Pollution reduction is around 30%
First treatment takes place in a Baffled Tank
A device with several identical chambersthrough which the effluent moves from top to bottom.Retention time is 24 hours.Pollution reduction is around 80%
Natural treatment of waste water occurs by channeling the effluent through several devices:
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Second treatment takes place in a anaerobic filter
A device filled with a filter material (cinder) throughWhich the effluent moves from top to bottom.
Retention time is around 8 hours.Total pollution reduction is around 90%At this stage CPCB standards are metbut the effluent still has an odour
Third treatment takes place in a planted gravel filter
A structure filled with gravel material and planted with water resistant plants, who provide oxygen to the passing effluent.Retention time is 1½ day.Pollution reduction is around 90%
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
RawSewage
OutletSettler
OutletBaffledReactor
OutletGravelFilter
OutletPond
BOD5
COD 0
200
400
600
800
1000
1200
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Post treatment takes place in polishing pondsfitted with aquatic plants and fishes.It is through this device that the water transformsfrom a lifeless state into living water again.
Ponds with aquatic plants are an efficient way to combine wastewater treatment,landscaping, aesthetics and water reuse, the pond can also act as a storage device.
Underground anaerobic process Above ground level aerobic process
CPCB standards are met at this point, except for the smell control
Overview of the different devices
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Surya Nivas, 2003 – 12 users
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Samasiti, 2009 - 25 PE
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Solar Kitchen, 1998 – 40 m³
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Surya Nepal Pvt Ltd(subsidiary of ITC)
125 m³/day
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Surya Nivas, Nepal60 m³ /day
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Kadambadi settlementNagipattinam
Post Tsunami Dewats projects
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Vortex systemsfor waste water treatment
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ATS – Algal Turf Scrubbers Treating toxic waste water
Algal are grow in shallow basins for cleaning water pollution, including heavy metals
In the process Biomass is grown and harvested for Energy - gas methane/ethanol/butanol - Bio-diesel – bio-aviation fuel
Note: solar energy absorption by algal is 45 to 50%, increase in biomass doubles/24 hrs, during the process algal absorbs CO2 and gives off oxygen
ATS needs Start up investment Land area is required for installing the basins
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Integrating ATS – Algal Turf Scrubbers
the use of algae for cleaning toxic
waste water
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Auromode
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“And justify the light on Nature’s face.”