community water purification...
TRANSCRIPT
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Community Water Purification System
Speakers: Collins Ward
Alison Wong
Will Lark
Green Team presents:
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System Overview
Bio Sand Filter Particulates, turbidity
UV Purifier Bacteria, viruses
Charcoal Filter Organic compounds,
metals
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The Problem40% of world population lacks accessto safe, clean drinking water3.5 million children die every year
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Target Customer:Tibetan Children’s Village
600 students and staff
Dharmasala, India
Current Situation: Centralized, gravity-fed watersource contaminated with micro-organisms
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SolutionCommunities of 500 to 750 people Requirements: Power source, temperate climate,
centralized, gravity-fed water source
Low cost First 5 years: $0.01 per person per day
Low maintenance Monthly check-ups, updates every 3 months and yearly
Effective removal of microbes and bacteria Coliforms, enteric viruses, E. Coli, cholera, salmonella,
giardia cysts, helminths, hepatitis, worms, Zn, Cu, Cd,Pb, Fe, Mn, As, etc.
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Integration of Components
Bio Sand Filter
UV Unit Housing
Storage Tank
Charcoal Filter
1
2
3
4
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BioSand Filter
Fine Sand (Grain size .03” Diameter)
Course Sand (Grain Size .25” Diameter)
Gravel (Grain size .5” Diameter)
3 Layers of Sifted Sand
Sand and biological layers filter out particulatesand remove turbidity
3 GPM flow rate HDPE plasticLocal materials
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BioSand Maintenance
Once every 3 months
•Remove lid and diffuser•Harrow sand with provided rake•Open release valve
1 2
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Ultra-Violet Light Unit
• Kills 99.99% of PathogenicBacteria and Viruses
• 50 Watts• 4 GPM
• Modified Existing Device• Interior is accessible• Adjustable height• Added safety features
• Easy Maintenance• Clean reflector plate• Replace bulb annually
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Pump and System Electronics
• 240 AC V input supply
• 12 V battery backup
• Inline Pump• 4.3 GPM
• Four piston, diaphragm-sealed
• Float switch in reservoir
• Connects to storage tank
• Control Box• Manual switch
• Safety fuses
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Activated Charcoal Filter
• Removes odor andmineral pollutants
• Affordable• India is one of the
world’s largest exportersof activated charcoal
• Medium pore size
• Connects to existingstorage tank
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System Architecture
• Modularity– Flow rate– Pump– Charcoal
• Access / Maintenance• Back-Up
– Bacterial removal– Power
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Benchmarking
• Our Product
– Scalable: 500 – 1500 population community
– Affordable: Larger Economies of Scale
– Versatile: Treat a variety of water types
– Robust: Sturdy under weather conditions
Options Practicality Robustness Size Scalable Affordable Versatile Effectiveness
Boiling 2 0 0 -2 2 1 1Ceramic Filters 1 1 -1 -2 -1 1 2Tube Wells 1 0 -2 0 -2 0 -2Chlorine Additaves -1 0 0 2 -1 2 1Ozonation -2 -2 -2 2 -2 1 2Deionization -2 -2 -2 2 -2 1 2Distillation -2 -2 -2 2 -2 1 2Reverse Osimosis -2 -2 -2 2 -2 1 2Solar Distillation -2 -1 -2 -2 -2 1 1Chemical Treatment -1 -1 -2 2 -2 1 1NAIAD 2 1 1 2 -1 2 2
2 – excellent 1 – good-1 – fair-2 – bad0 – not applicable
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Water Test Results
total coliform test results
0
5000
10000
15000
20000
dirty after sand after UV
Location in System
To
tal C
olif
orm
/100
mL
of
Wat
er
E-Coli Test Results
0
100
200
300
400
500
600
dirty after sand after UV
Location in System
E-C
oli/
100m
L o
f W
ater
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Market
• $27 – 30 billion (US dollars) spent annually on water andsector in developing countries
70%Domestic Public
Sector
20%Int'l Aid
Private / Community
10%
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Business Model
• Produce in the U.S.A and market it toDonors– World Bank, Danida, USAID, Water Aid
• Startup capital: $55,000
• Break Even Point: 2.5 years
• IRR: 10%
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Questions…