GDMD for Kenya

Gravity-driven membrane disinfection (GDMD) for household water treatment in Kenya

The goal of GDMD project started at Eawag in July 2010 is to develop a novel household water treatment system based on the GDMD technology. This novel GDMD system is designed considering economic, technical and social conditions in urban communities of the developing world.

Field tests in Kenya

Through this project household filter prototypes with a target capacity of 2-5 litres per hour have been designed for field testing. Treated water is stored safely in an integrated reservoir, to minimize the risk of recontamination. In May 2011, 24 households representing different types of potential users were selected for field trials. Both urban and rural areas are represented, and water sources include boreholes, open wells, river and municipal piped water. 6 month of monitoring shows high efficiency in pathogen removal, and intense interest among communities where filters have been distributed. Flow rates are reportedly good after 6 month of operation, and monitoring will continue for one year. The field tests are conducted in partnership with Kenya Water for Health Organization (KWAHO) and in close collaboration with other Kenyan NGOs and private sector.

GDM filter during field tests in Kenya

Inspite of a thick biofilm formed after 5 month of operation, GDM filter works well

Marketing and distribution

The eventual production cost of a household filter is estimated at ~30€. Assuming a system lifetime of several years, the running costs of the system will be affordable for poor Kenyan households. However, the initial investment costs could represent a significant barrier to adoption. Alternate financing mechanisms, including rental or leasing options, and possibly extension of microcredit loans will be explored.