17/08/2023

Week 2

Week two was mostly our volunteering project. Each morning we would pile into 2 Tuk Tuks and ride out into the Cambodian countryside. Even today most families living outside of cities in Cambodia do not have access to running clean water. Families either have to buy bottled water, or rely on rainwater, which can be easily contaminated while being stored. Young children are especially susceptible to waterborne illness. Our group spent 3 days building and installing biosand water filters for families in rural Cambodia. Biosand filters are an economical and effective technology to filter water and typically last about 40 years. They are made of simple materials, but highly effective. Mixing concrete in the hot humid weather was the hardest part. Biosand water filters are made of cement poured into a bolted together metal mold. The filtration system consists of Biosand on the top, with small gravel in the middle to support the sand, and larger rocks on the bottom to prevent the gravel from falling to the bottom. At the bottom of the filter, there is a small tube, installed before the concrete is poured, that runs up through the cement to the spout. The gravel and rocks work in conjunction to prevent the sand from falling down and getting sucked into the tube. Water is poured into the top of the filter. The very top layer of the biosand contains a small ecosystem of microorganisms called the biolayer. The microorganisms in the biolayer feed on pathogens, contributing to filtration. In addition to the biolayer, as the pathogens pass through the rest of the biosand, almost all of them get trapped and stuck in the sand grains. In addition to getting stuck in the biosand, many pathogens will die during filtration due to hunger, old age, or suffocation. Biosand filters have been shown to remove almost 100% of worms, protozoa, bacteria, dirt, and iron. The filters also remove between 70% and 99% of viruses. During my time near Siem Reap, I helped build and install 10 Biosand filters, which will provide up to 100 people in rural Cambodia with access to clean water for 40 years.

Week 2
Week 2
Week 2
I BUILT MY SITE FOR FREE USING