mit household water treatment and safe storage...
TRANSCRIPT
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MIT Household Water Treatment and Safe Storage Innovations
“Demo” to WHO International Network to Promote Safe Household Drinking Water and Safe Storage
Nairobi, Kenya
June 15, 2004
Susan Murcott, LecturerMass Institute of TechnologyDept. of Civil and Environmental Engineering
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Since 1998, about 30 students have done
MIT Master of Engineering thesis projects on
household drinking water treatment and safe storage
in various developing countries including: Nepal, Nicaragua,
Haiti, Dominican Republic, Peru
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4. Parasi
3. Kathmandu2. Butwal
1. Lumbini
Everywhere
5. Trekking
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Our Group
• Put group photohere
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In drinking water projects to date, we have 7 areas of activity:
• (1) Methodological Evaluation• (2) Site Investigation (water quality testing
for microbiological contamination, arsenic, other)
• (3) Technology Evaluation (existing options) • (4) Technology Innovation• (5) Pilot Programs and Monitoring• (6) Manufacturing and Marketing• (7) Implementation
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Technology Innovation
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1. The Ceramic Disk Filter (also known as the “Lily Filter”)
4. Tommy’s Arsenic Biosand Filter
3.Xanat’s Semi- Continuous SODIS Disinfection
2. Melanie Pitcher Slow Sand Filter
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Ceramic Disk Filter
(the “Lily Filter”)
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Candle
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Ceramic Water Filter Types
Disk Candle Pot
Filter Media/Element
Filter System
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Here is Jason Low, making ceramic disk filters at Madyapur Clay Crafts, Thimi, Nepal
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Our Prototype Ceramic Disk Filter
The “CeraMIT” team has come up with a terracotta clay filter disk system for treating drinking water.
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Courtesy of Lily Cheung
“Lily” Filter
• We have also come up with a prototype of a plastic filter system to contain a ceramic disk.
• This system allows the user to remove the centerpiece disk easily, for cleaning or replacement.
• We call it the “Lily” filter because it was designed by Mech.Eng. student Lily Cheung
• We expect this system to cost about $6.00
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Melanie Pitcher Filter
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Here’s Melanie at her filter testing field site in Lumbini, Nepal.
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MIT students have been studying slow sand filters and BioSand Filters in Nepal and
Nicaragua since 2000.
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BioSand Filter
A variation on the slow sand filter. The biosand filter has these characteristics:
•Intermittent slow sand filter for household use
•Invented in the 1990s by Dr. David Manz of Alberta, Canada at the University of Alberta.
•Uses of local materials – sand, concrete or plastic
•Flow rate (3 - 30L/hr)
•Somewhat expensive for low income countries ($25)
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Melanie Pitcher Filter
- The Melanie Pitcher Filter is a smaller, portable alternative to the BioSand filter.- Costs only $1.00!
-It is a potential interim measure for poorer households until they can afford a larger capacity water filter.
- Field and laboratory experiments comparing the Melanie Pitcher Filter with the concrete and plastic biosand filters gave good results!
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Melanie Pitcher Filter
- Microbial (E. coli) removal of pitcher filters comparable to existing BioSand filtration technology.Nepal MITPitcher 80% 97% filters 86% 97%
BioSand 81% 95%filters 87%
Ripening 8-10 30-40 period (d)
- Strong correlation between biofilm maturation periods & source water quality.
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Xanat’s Semi Continuous
Solar Disinfection
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Semi- Continuous Solar Disinfection
MIT environmental engineering student, Xanat Flores, from Mexico, developed a
semi-continuous solar disinfection system.It costs about $1.00!
But before we explain Xanat’s system, we need to explain SODIS.
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What is SODIS?• PET plastic bottles exposed to
solar radiation for 1-2 days to disinfect drinking water
• Variations:– Exposure time– Clear, black or reflective
surface
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Here’s Amer Khayyat, also of Lebanon, studying SODIS in Nepal in January 2000
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What is Semi-Continuous SODIS?
Polluted water container
Roof of House with solar disinfection system
Inside housecollectionof purified Water
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SEMI-CONTINUOUS SODIS
PET BOTTLES,GLUED TOGETHER
VALVE TO ASSURE RESIDENCE TIME OF TWO DAYS
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Xanat performs Semi-Continuous SODIS experiments Lumbini, Nepal -- January 2003
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Semi-Continuous SODIS
·
Uses recycled clear, plastic bottles (PET) bottles, cut in 2 and glued together. ·
Disinfects water by 2 means:·
Solar Radiation and the Sun’s Heat
·
Simple The Nepal Project
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Tommy’s Arsenic
Biosand Filter
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Lumbini
Tansen
NawalparasiParasi
NEPAL
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• Invented by Tommy Ngai (M.Eng.2002)
• Won MIT IDEAS Design Competition (2002) and World Bank Development Marketplace (2003) Competition
• Concept: Arsenic filter combined with microbiological filter
• Arsenic removed by adsorption to iron nails; bacteria removed by sand filtration and biological means
• Pilot scale studies in Fall 2002 to Spring 2003
• 1,200 units in ’02-’03• 2,500 units in ’03-’04
Tommy’s Arsenic Biosand Filter
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Concept:
An arsenic filter combined with a microbiological filter
Theory:
Arsenic removed by adsorption to iron nails
Bacteria removed by sand filtration and biological activities
Tommy doing experiment
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Technical Performance (16 Filters Pilot Study)
Technical Indicators Average Results
Arsenic Removal 93 %
Total Coliform Removal 58 %
E. Coli Removal 64 %
Iron Removal 93 %
Flow Rate 14 L/hr
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Phase II Evaluation Summary
Best2nd3rdOverall Ranking Low running cost
User acceptanceLow initial cost
Long-term sustainabilitySimple O&MEasy constructionMaterials availability
Not testedBacteria removalNot testedNot testedIron removal
93-95%95-99%85-90%Arsenic removalABF3-Kolshi2-Kolshi
= poor = moderate = good
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Arsenic Filter Implementation• Collaboration between MIT, ENPHO, Nepal Red Cross, RWSSSP• Scale up our pilot study to 1200 ABFs• Seeking funds to expand our scheme• Implementation scheme include:
1. Establish an in-country ABF network among partner agencies
2. Setup ABF Technology Centers for enhanced research and training
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3. Build capacity in local authorities, village committees, school teachers, etc.
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4. Train local technicians and entrepreneurs in ABF construction, O&M, troubleshooting
5. Hold village-level health education and filter demonstration workshops
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6. Follow up monitoring and evaluation
7. Dissemination of findings through conferences, etc. to the development community and interested parties.
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Tommy doing experiment
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Laboratory Methods
Innovations
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Total Coliform
Fecal Coliform
H2 S bacteria
Indicator Organisms
Total Coliform
Fecal Coliform
E.coli H2 S Producing Bacteria
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TC/E.coli P/A results (+ TC)
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H2S P/A results
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m-Coliblue24 (TC/E.coli)
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The Phase-Change Incubator• Phase-change technology maintains constant
temperature• Allows microbial testing in areas without
electricity• Reliable, low cost design
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Amy Smith’s Membrane Filtration Unit Invention
Millipore Filtration
Unit
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(6)
Manufacturing and Marketing
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02-03 M.Eng/Sloan “CeraMIT”
Team
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Ceramics Manufacture
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Our Water and Sanitation Web Site
http://ceemeng.mit.edu/~water
For more info contact: “Susan Murcott <[email protected]>