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. Acknowledgements Civil & 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 Countries A Case Study in San Pedro de Casta, Peru Megan Burke, Elizabeth Garvey, Kathleen Hanlon & Jaclyn Lemieux * 3 = best 1 = worst Highest Total Score Prevails