Water Filtration System – January 2023 – Western
Water Filtration System – January 2023 – Western

Water Filtration System

The water filtration system at Muamba, Kenya uses the slow-sand water filtration process.  In the process, a good layer of bacteria is created (schmutzdecke) and as water passes through, the bad bacteria are eaten by the good bacteria.  The contact time is calculated using a formula that takes into account the surface area and the depth of fine sand.  The slow-sand filter is made up of a filter and storage tank, depending upon the location, the number of filters varies, and they systems work independent of each other but feed a common storage tank.  Multiple filters allow maintenance to occur without having to stop the entire operation.

Using a gravity feed system, the water flows from a “dirty” storage tank, through a series of pipes and into the slow-sand filter.  The water enters the top of the tank and flows down though a defined thickness of fine sand, coarse sand, pea gravel and rock before exiting the bottom of the tank and goes to the clean storage tank.  The water flows through an up pipe where it enters the clean storage tank.

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