Latest Filter Pot results

Eston Yesaya is our new MSABi laboratory technician.  He commenced in November and jumped straight to business performing analysis of a recent batch of filter pots.  The results presented below are very promising. MSABI filter pots are on average removing 3.4 log of e.coli indicator bacteria. This is without silver application which we would expect would further improve the removal efficiency.
Eston Yesaya at work in the lab testing pots.  Eston is MSABI's new laboratory technician.
The results indicate that the performance of the filter, in terms of bacterial removal, is not affected by the ammount of rice husk added.  Rather, as also found in recent studies in Cambodia, the filter effectiveness is affected by the particle size distribution.  The ammount of rice husk does impact on flowrate and pot strength - ie the more husk the greater the flowrate at the expense of pot strength. 

We will now aim to test the same pots with silver application.  Further, future research studies will focus on particle size distribution of rice husk and we also hope to investigate the impact of additional additives into the mix - including activated carbon, bone char, zeolite and laterite.

The filter pot project has been a long journey - but we are sure now we can consistently produce a product that offers a vast improvement in water qaulity compared with drinking untreated water sources.  For example, the river water used below has counts in excess of 100,000 (105) bacteria per 100ml of river water.  Compare this to typical raw sewage data which has 106-108 counts (Metcalf and Eddy, 2004).  Unfortuantley this river water is from the Lumemo River which runs through Ifakara and serves as both a toilet and drinking water source for many local residents.  People are drinking the equivalent of raw sewage!!!  The filter pot offers a simple tool for treating and improving the quality of such polluted water sources.  We are aiming to have our filter pots ready for market in the first half of 2012.