Solar Two - Clean Water for an Orphanage

We installed a water filtration system for another orphanage in Cambodia. We used an ultra-membrane filter with pore size of 0.1 micron. It is able to remove bacteria and give clean water. It requires a minimum water presure of 2 bar to operate, hence we need to install an electric water pump before the filter so that it has enough pressure to operate the filter. A setback of this system is it requires regular back flushing in order to clean the filter to prolong the filter's life. Once the filter to clog up, it is time to replace a new filter. Suitable for making rainwater drinkable.

Solar Two - Rainwater Harvesting

We experimented and constructed a rainwater harvest system for the orphanage at Prey Veng.

Back in the laboratory, we experimented using the heat gun to seal plastic sheets together for making the rainwater collector. We also build a huge water bag to collect the 1 tonne of rainwater.

We brought all the materials to the orphanage and constructed the rainwater harvesting system. We used a monkey ramp to drive the iron picket into the ground. The plastic sheets were spreadout and tightly secured to the iron picket with steel wires.

The design need some fine tuning as we did not expect the rain in Cambodia to have very strong wind. One day when it was raining heavily, the strong wind blew and tore the plastic sheet which is used to collect the rainwater. We recommend them to build a proper roofing system instead of spreading a wide plastic sheet in the open. This approach will be able to withstand the strong wind when it rains.