Household Water Treatment and Safe Storage Factsheet: Source ...

Household Water Treatment and Safe Storage
Fact Sheet: Clay
Key Data
Inlet Water Criteria
The treatment capacity of clay is optimum when water pH is about 5.6 (Jinadasa et al. 1988)
Bucket system is only good for low fluoride concentration (93.8% 1
Field
Not
available
Not
available
Not
available
Not
available
Not
available
Not available
1 Using bauxite from Malawi (Sajidu et al. 2008)
Treatment efficiency depends on the quality of the clay and kind of filter used
Operating Criteria
Flow Rate Batch Volume Daily Water Supply
Not available Not available Not available
The flow rate, batch volume and daily water supply depend on the technique and kind of filter
used
Robustness
The clay used in filters needs to be replaced or regenerated (very costly) when saturated
It is necessary to measure the fluoride concentration in the outlet water to know when to
replace or regenerate media
Estimated Lifespan
Clay media needs to be replaced every 25-40 days typically
Manufacturing Requirements
Worldwide Producers:
Bricks are produced everywhere
Local Production:
Clay can be burnt in a kiln locally
Materials:
Clay
Kiln
Labour:
Anyone can be trained to produce burnt clay chips
Maintenance
Frequent replacement or regeneration of clay
Clean filter on a regular basis