New work suggests, however, that adding a tiny amount of salt to turbid water causes the suspended clay particles to flocculate and sink to the bottom of the bottle, leaving clear water that can be decanted and subjected to the SODIS method.
The more turbid kaolinite and illite suspensions required the addition of a bentonite "jumpstarter" in order to be brought below the SODIS threshold.
However, by adding a little bentonite with the salt to water containing these different clays, most of the particles glom together and settle out, creating water clear enough for SODIS
He said that in the face of fiscal and energy crises, the SODIS
was a very sustainable and cost-effective water treatment option, despite its apparent shortcomings in terms of the selectivity in elimination of harmful substances from drinking water.
method has been approved by the WHO, and is commended for its proven efficiency in the aftermath of the tsunami disaster in Southeast Asia in 2004," it said.
The project uses green energy and a chemical-free treatment; it will transport water using a solar energy-based pump, treat the water with a low-cost method that uses Moringa oleifera seeds which can be found locally, and then further disinfects the water using the SODIS
method-Solar Water Disinfection.
A number of other participants shared views and recommendations about SODIS
He said, facing the fiscal and energy crises, the SODIS
(Improved drinking water) is a very sustainable and cost-effective water treatment option, despite its apparent shortcomings due to selectivity in elimination of harmful substances from drinking water.
is a technique used in developing countries to disinfect water by incubating water in PET bottles in direct sunlight.
One method of using sunlight to disinfect water that is recommended by the United Nations Children's Fund (UNICEF) is known as SODIS
(Solar water Disinfection).
Ms Mome said that SODIS
was a simple method which does no involve money or energy.
Household solar drinking water disinfection, or SODIS
, is a simple, low-cost method that involves filling clear plastic bottles, such as old soda bottles, with water containing diarrhea-causing microbes and exposing them to direct sunlight for several hours.