urc poster
TRANSCRIPT
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Recommended Design:
Stack Feed Chlorinator
Based on the results of the experiments conducted in the lab
and various factors considered in the decision matrix, the
most viable option for San Pedro de Casta proved to
be the Stack Feed Chlorinator.
AcknowledgementsCivil & Environmental Engineering Department
Faculty Advisor: Dr. Robin Collins
Damon Burt & Kellen Sawyer
BACKGROUND DESIGN SOLUTION RECOMMENDATIONS
Pro’s Con’s
Use standard
chlorine
solutions
Requires more
attention from
operator
Small flows
achievable
Requires fine
tuning
Results
• Flow decreased over time
• Constant head
Pro’s Con’s
Precise Possible
vandalism
Consistent
dosing
Expensive to
replace
Pro’s Con’s
Simple parts Dependent on
influent flows
Minimal
maintenance
Dependent on
pH
Drip Chlorinator
Solar Power Chlorinator
Results
• 100 Watt solar panel
• 12-Volt, 200 Amp battery
• 12-Volt DC peristaltic
pump
• Pump output: 2.7 mL/min
Results
• 4.6 gpm diverted from the
water main into the side
stream
• 0.694 gpm through stack
feed
• Assuming a pH of 7
Stack Feed Chlorinator
Design Specifications
• Population: 1200
• Water consumption per capita: 50gpcd
• Desired Total Chlorine residual: 1mg/L
• No electricity
• Local materials
• Minimal operation and maintenance
Decision Matrix
Factor Weight % Solar Stack Feed Drip
Score Total Score Total Score Total
Capital $ 5 1 5 3 15 2 10
O&M $ 20 1 20 2 40 3 60
Reliability 35 2 70 3 105 1 35
Ease of
O&M 30 3 90 2 60 1 30
Ease of
Contruction 10 1 10 3 30 2 20
Total 195 250 155
San Pedro de Casta is a small village in
Peru with drinking water contaminated
by E.coli. In the village’s remote location,
reliable electricity needed to power a
typical metered dosing system is not
available, nor do they have the funds to
afford such equipment. Chlorination of
drinking water is an inexpensive,
effective disinfection practice, which will
be feasible for the community of San
Pedro de Casta. The team of students
conducting the project teamed with the
UNH Chapter of Engineers Without
Borders (UNH-EWB). UNH-EWB will
begin implementation of the design in
San Pedro de Casta beginning January
2016.
Chlorine Disinfection of Drinking Water
in Developing CountriesA Case Study in San Pedro de Casta, Peru
Megan Burke, Elizabeth Garvey,
Kathleen Hanlon & Jaclyn Lemieux
* 3 = best 1 = worst Highest Total Score Prevails