experience with engineering student projects in developing ...web.mit.edu/watsan/docs/other...
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Experience with Engineering Student Projects in Developing Countries 1998-2003
Susan Murcott, LecturerMass Institute of TechnologyDept. of Civil and Environmental Engineering
Engineers without Frontiers-USA National Conference
Cornell University
September 18 – 20, 2003
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Clean Water for 2 Billion People?By Susan Murcott, Lecturer, MIT
Civil and Environmental Engineering Dept.
Water pollution and water scarcity are the 2 biggest water engineering challenges of the 21st century
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Today, more than 1 billion people in the world lack access to clean, safe drinking water
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This means more than 1/6th of our global family are lacking the basic foundation for human health -- safe water.
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Women and children are the ones most profoundly impacted by water pollution and water scarcity.
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Clean Water for 1+ Billion People?By Susan Murcott, Lecturer, MIT
Civil and Environmental Engineering Dept.
Women and children are often the ones who carry heavy loads of water long distances each day to supply their family’s needs.
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Clean Water for 1+ Billion People?By Susan Murcott, Lecturer, MIT
Civil and Environmental Engineering Dept. National Geographic
Women are the primary care-takers of children and other family members sick and dying from waterborne illnesses.
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Waterborne diseases are the leading cause of childhood death worldwide and are responsible for the stunted growth of 67% of surviving children in the developing world (WHO, 2000)
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Nicaragua 2002
3.4 M people, mostly children, die each year from preventable water-borne diseases, more than the deaths from AIDS.
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3 Global Economic Classes
Local biomass
DurablesThrow-aways
Materials
WalkingBicycles, buses
Private carsTransportation
Insufficient grain, unsafe water
Grain, clean water
Meat, canned and packaged food, soft drinks, bottled and tap water
Food
Poor$1/day(20%)
Middle$2/day(60%)
High > $20/day (20%)
Income
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Safe Water Unsafe Water
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Private Cars Walking
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Since 1998, about 50 students have done
MIT Master of Engineering thesis projects on
water and wastewater treatment
in 4 developing countries: Nepal, Nicaragua, Haiti, Brazil
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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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San Francisco Libre
Managua
Matagalpa
Nicaragua
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•Port au Prince
•Dumay
•Les Palmes
•Bas Limbes
•Ferrier
Matagalpa
Haiti
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Brazil Municipal
Wastewater Projects
• Tatui• Riviera• Alfenas• Paraty
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In drinking water projects, we have had 6 areas of activity
• (1) Methodological Evaluation
• (2) Site Investigation (water quality testing for microbiological contamination and arsenic)
• (3) Technology Evaluation (existing options)
• (4) Implementation programs (Biosand, chlorination pilot study, monitoring programs)
• (5) Manufacturing and Marketing
• (6) Technology Innovation
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(1) Methodological Evaluations
How to do high quality lab work in developing countries?
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Indicator Organisms
Total Coliform
Fecal Coliform
H2S bacteria
Total Coliform
Fecal Coliform
E.coli H2S 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 constanttemperature
• Reliable, low cost design
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Amy Smith’s phase-change Incubator allows microbial testing in areas without electricity
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(2) Site Investigation /
Water Quality Testing
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Method of Analysis for Well Testing(113 wells total)
111
67
23
0
20
40
60
80
100
120
H2S ProducingP/A
Fecal C.MembraneFiltration
E.coli MembraneFiltration
# te
sts
perf
orm
ed
88 Tubewells Tested
Public62%
Private38%
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Well Testing Results
18%0%> 20 CFU/100ml FC
12%0%> 200 CFU/100ml FC
18%3%> 10 CFU/100ml FC
35%23%Positive for FC
40%36%Positive for H2S
PrivatePublic
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59.09% 9.09% 18.18%
4.55% 4.55% 4.55%
79.52%
2.41% 6.02%
10.84%
1.20%
91.18% 8.82%
96.77%
3.23%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
% of Samples Analyzed
Parsa District
Bara District
Lumbini District
Kathmandu Valley
GFAAS Results
Non-Detect 0ppb-10ppb 10ppb-20ppb 20ppb-50ppb 50ppb-100ppb 100ppb-150ppb
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(3) Technology Evaluations
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Household Drinking Water Treatment
• Coagulation
• Filtration
• Disinfection
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We have looked at what household practices and
systems exist in developing and industrialized country marketplaces and homes
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BioSand Water Filter
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Katadyn (“Ceradyn”) Ceramic Filterfrom Switzerland..
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Hong Phuc Candle Filter –Vietnam
This system exterior is an exact imitation of the Katadyn filter. The candles are not of the same high quality. However, it only only costs $5.00
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Terafil Filter
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Chlorine Disinfection
• Type of Chlorine:: NaOHCl2 or CaOHCl2.
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* 3-Kolshi System* Jerry Can* Arsenic Treatment Unit * AM/BPI3* Iron Oxide Coated Sand* 2 Kolshi* Arsenic Biosand Filter•* Arsenic Treatment Plant
8 Arsenic Remediation Technologies
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Three-Kolshi System
As contaminated water goes in
Sand and iron filings
Fine sand
Clean water comes out! The real thing!
The Nepal Project
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1st World Arsenic Treatment –Apyron Technologies = $2000
New pump
As contaminated influent water
GAC
Sand
Clean, treated water
Activated alumina metal oxide
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(4)
Pilot Programs and Monitoring
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The Safe Water System Approach
• Point-of-Use Treatmentusing locally produced and distributed sodium hypochlorite solution.
•Safe Water Storage in plastic containers with narrow mouths, secure lids and dispensing spigots to prevent recontamination.
•Education: Influence hygiene behaviors and increase awareness about the dangers of contaminated water and waterborne disease.
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Household Chlorination Pilot Study (1/2001 – 1/2002)
Based on CDC Safe Water Systems
www.cdc.gov/safewater
GOALS
•Provide Safe Water to a portion of the Lumbini population
•Test the acceptance of household chlorination in Nepal
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(5)
Manufacturing and Marketing
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The Objective
PRODUCE A CHLORINE DISINFECTANT&
ESTABLISH MICRO-ENTERPRISE PROGRAM
PiyushImported bleaching powder
Sodium hypochloriteon-site generation
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Chlorine Generator
* 113 g available Cl/h* 0.8% chlorine * 5.5 kW / kg chlorine* 4.1 kg, 18 X 100 cm* 2 year warranty* $2000
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Ceramics Filter Manufacture
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(6)
Technology Innovation
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Design Principles for Appropriate Technology
(E.F. Schumacher: Small is Beautiful, 1973)
• 1. Simple design & production• 2. Inexpensive• 3. Use local materials for local use• 4. Rural focus
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“Sustainable development” has 2 widely accepted meanings:
Balance: economic, social, environmental aspects
Equity…”meeting the needs of the present without compromising the ability of future generations to meet their own needs.”
- Our Common Future, 1987
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A sustainable technologybalances Economic:
* cost-effective
* Supports local economies
* self-sustaining
Social* convenient
* ussd-friendly
* socially acceptable
Environmental* Environmentally friendly
•Low energy requirements
•Recyclable waste
•Using local materials
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2. Melanie Pitcher Slow Sand Filter
1. The Ceramic Disk Filter (also known as the “Lily Filter”)
4. Xanat’s Semi Continuous Solar Disinfection
3.Tommy’s Arsenic BiosandFilter
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Ceramic Disk Filter
(the “Lily Filter”)
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Water storage is ancient and ceramic filters might be ancient too. Here is an antique ceramic disk filter from Spain that is about 100 years old.
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Our ceramic filter work began with Junko Sagara, from Japan, in 1999
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Junko met with potters who made filter candles like this at Madyapur Clay Crafts Thimi, Nepal
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Candle
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The 3 most common types of filtering elements are: disk, candle and pot
Ceramic Water Filters come in many shapes and sizes
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Ceramic Water Filter Types
PotDisk CandleFilter System
Filter Media/Element
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Disk
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Here is Jason Low, making ceramic disk filters at Madyapur Clay Crafts, Thimi, Nepal
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Filter Manufacturing Process* Prepare raw materials.* Mix by hand or in mixer* Press in mold or filter press* Dry (5-7 days).* Fire (1000°C).* Cement into ceramic/metal containers.* Dry (2 days).
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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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“Lily” Filter
Courtesy of Lily Cheung
• 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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Slow Sand Filters
The concept of slow sand filters has also been around for over 100 years.
• Relies on natural biological, physical and chemical mechanisms to purify water
• Uses local materials – sand, gravel, concrete
• Loading rate (0.1-0.2 L/hr)
• Simple and inexpensive
• Easy to operate and maintain
• Treated water quality is goodWaterlines April 2003 V. 21 #4
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BioSandFilter
A variation on this concept is called the “biosand 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 asmaller, 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 biosandfilters 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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Arsenic Biosand
Filter(the “Tommy Filter”
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• Invented by Tommy Ngai (M.Eng.2002)
• Won MIT IDEAS Design Competition (2002)
• 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
• Scale-up to 1,200 units in ’03-’04
Tommy’s Arsenic Biosand Filter
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“The Tommy Arsenic Biosand Filter.”Here’s Tommy
installing his filter
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Gravel
Fine Sand
Coarse Sand
Iron NailsPolyester Cloth
Water
Metal Diffuser Box
Lid
Arsenic Removal Unit
Bacteria Removal Unit
Dirty Water In
Clean Water Out
Arsenic Biosand Filter Setup
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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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MIT Nepal Water Project Team Member, Sophie Walewijk(Stanford PhD student), testing Tommy’s Arsenic Filter
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Technical Performance (16 Filters Pilot Study)
14 L/hrFlow Rate
93 %Iron Removal
64 %E. Coli Removal
58 %Total Coliform Removal
93 %Arsenic Removal
Average Results
Technical Indicators
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Social Acceptability (16 Filter Pilot Study)
Most users like the high flow rate, simple operation, and minimal maintenance of the filter. In addition, the clean-looking and good-tasting filtered water is appealing. While health improvements may take months or years to appear, these favorable “observable” water qualities (e.g. clarity, color, taste, iron removal) may promote quick acceptance of the filter. Most users think the ABF (the “Tommy Filter”) is a durable and appropriate solution to arsenic and pathogens contamination. Researchers in Nepal regard the ABF as the best technology available in Nepal.
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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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SODIS
• SODIS was invented by Prof. A. Acraet al. of American University of Beruit, Lebanon in 1982.
• Researchers at the Swiss Federal Institute of Environmental Science and Technology (ETH-EAWAG/SANDEC) took up extensive studies of SODIS beginning in 1991.
• MIT students have investigated SODIS in Nepal and Haiti since 1999.
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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
VALVE TO ASSURE RESIDENCE TIME OF TWO DAYS
PET BOTTLES,GLUED TOGETHER
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Xanat performs Semi-Continuous SODIS experiments Lumbini, Nepal -- January 2003
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· 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
Semi-Continuous SODIS
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Questions?