Solar Water Works is working to apply its technology in developing countries as a method of disinfecting water for drinking purposes. Currently the most common method of disinfection is the use of chlorine. However, many dislike the taste and do not use it or cannot afford the drops. Additionally, it is very easy to over treat with chlorine which can have negative health effects. For these reasons, we believe that our technology is a better solution for water disinfection. Additionally the PECO system is portable, low cost and can provide treatment without the need for access to electrical power. Solar Water Works conducted a pilot test of the technology in Haiti which proved the feasibility of this application.

Haiti Pilot Project

This pilot project was conducted on Ile a Vache Island which is located 6 miles off the south coast of Haiti. The residents of this village typically collected water from either a pit well or a pump well. The tests on this water used 2 square feet of Solar Activated Titanium Catalyst and a 12 V solar panel. This solar panel powered a 1.25 GPM circulation pump. The samples were collected from the 5 gallon water container at 15 minute intervals. The test parameters included: temperature, pH, salinity, anode voltage, anode current, solar intensity, coliform bacteria and total residual chlorine. Two tests conducted 1 tests with the pit well water and 3 tests with the pump well water.

Test #1 Pit Well Results

  • Complete disinfection in 2 hours
  • 6% salinity decrease—from 3.6 to 3.4 ppt
  • pH decreased from 7.2 to 6.5
  • Voltage and current stable thoughout test

Test #2 Pump Well Results

  • Complete disinfection in 1 hour
  • 25% salinity decrease—from 0.51 to 0.38 ppt
  • No significant pH change
  • Voltage and current stable thoughout test

Test #3 Pump Well Results

  • Complete disinfection in 2 hours
  • 28% salinity decrease—from 0.50 to 0.36 ppt
  • pH decreased from 7.3 to 6.6
  • Voltage and current stable thoughout test

Test #4 Pit Well Results

  • Complete disinfection in 2 hours
  • 6% salinity decrease—from 3.4 to 3.2 ppt
  • pH decreased from 6.9 to 6.7
  • Voltage and current stable thoughout test

Conclusions

This pilot test was successful in disinfecting the well water to safe levels for drinking. This test showed the feasibility of using Solar Water Works technology for drinking water purification in developing countries.