z

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