Seeds of Hope has discovered the BioSand Filter (BSF) to be an extremely effective intervention in eradicating homes of water-borne diseases. At our Ndola Resource Center SoHIP has constructed a BSF Factory that can produce upwards of 400 BioSand Filters per month and uses sustainable practices, such as water cycling, local material purchasing, etc. This factory is instrumental in SoHIP being able to provide living giving solutions to thousands of people each year.
BioSand Filter Factory at the Ndola Resource Center
This video is a tour of the BioSand Filter Factory sorting stations.
1. Purchase media (sand & arrogate) from local quarry.
After researching different types of media, or sand and arrogate (river, quarry, etc.), SoHIP concluded the irregular edges of a particular quarry’s media produced the best filtration results. When purchasing, many sizes come in one load, thus the media must be sorted to meet SoHIP’s functional needs.
2. Sort media by dimension.
Various uses require different dimensions. For instance, gravel is required for pump installation but less than .03m is required for a layer of the BioSand Filter. Historically, sorting was done by hand or in an automated manner that only sorted one size at a time. Seeds of Hope’s custom, in-house fabricated, machines wash and sort media into three sizes simultaneously! These advancements decrease preparation time and increase production.
3. Recycle water for continuous use in Step 2.
Media is not washed at the place of purchase, so SoHIP uses fresh water to wash silt from the media during sorting. This water, after contacting and washing the media, carried away the silt and is very dirty. Water is a precious resource, so SoHIP, in conjunction with CAWST, designed a water recycling system. The dirty water is dirrected into tanks where the silt settles and the water becomes progressively cleaner until it is ready to be used as a washing agent again.
4. Bag, remove, and use media.
Once the media is sorted into like-sizes it is bagged and removed from the sorting station and placed with other like-sizes for use as gravel pack for borehole installation, biosand filter sand, or something else. SoHIP has named the prepared bags “soldiers” because they are lined up and waiting, ready to be depolyed for use in saving more lives!
After the media is sorted, portions of it are taken to the BioSand Filter Fabrication area where the filters are completed and prepared for delivery.