The SODISWATER PROJECT The SODISWATER PROJECT - Solar Disinfection (SODIS) of - Solar Disinfection (SODIS) of Drinking Water Drinking Water Dr Kevin McGuigan Dr Kevin McGuigan Dept. of Physiology & Medical Dept. of Physiology & Medical Physics Royal College of Physics Royal College of Surgeons in Ireland Surgeons in Ireland Dublin 2, IRELAND Dublin 2, IRELAND Email: [email protected]Email: [email protected]
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The SODISWATER PROJECT - Solar Disinfection (SODIS) of Drinking Water
The SODISWATER PROJECT - Solar Disinfection (SODIS) of Drinking Water. Dr Kevin McGuigan Dept. of Physiology & Medical Physics Royal College of Surgeons in Ireland Dublin 2, IRELAND Email: [email protected]. Salgaa, Nakuru, Kenya. - PowerPoint PPT Presentation
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The SODISWATER PROJECTThe SODISWATER PROJECT- Solar Disinfection (SODIS) - Solar Disinfection (SODIS)
of Drinking Waterof Drinking WaterDr Kevin McGuiganDr Kevin McGuigan
Dept. of Physiology & Medical Dept. of Physiology & Medical Physics Royal College of Surgeons Physics Royal College of Surgeons
in Irelandin IrelandDublin 2, IRELANDDublin 2, IRELAND
After 6 hrs in the sun, drink the After 6 hrs in the sun, drink the waterwater(supervised by the rest of the (supervised by the rest of the village)village)
2004 2004 Indian Indian Ocean Ocean TsunamTsunamii
Despite >10 years research & > 30 papers, it Despite >10 years research & > 30 papers, it became obvious that Aid Agencies were reluctant became obvious that Aid Agencies were reluctant to promote SODIS as a method of water treatment to promote SODIS as a method of water treatment in aftermath of humanitarian disasters.in aftermath of humanitarian disasters.
In 2006 obtained €2.7M funding (€1.9M EU, In 2006 obtained €2.7M funding (€1.9M EU, €0.3M Irish Govt. & €0.5M others) for the 3 €0.3M Irish Govt. & €0.5M others) for the 3 year year SODISWATER ProjectSODISWATER Project to expand to expand knowledge of solar disinfection (SODIS) knowledge of solar disinfection (SODIS) and help promote technology.and help promote technology.
Results Results No Significant Effect ObservedNo Significant Effect Observed• Political tension. Political tension. • Pre- & post-election (3-4 Pre- & post-election (3-4
months) suspension of all months) suspension of all foreign funded projects.foreign funded projects.
• Economic hyper-inflation.Economic hyper-inflation.• Cholera epidemic.Cholera epidemic.• Fear of interference with bottle Fear of interference with bottle
S. Africa ResultsS. Africa Results• Incidence rates were lower in those Incidence rates were lower in those
drinking solar disinfected water (incidence drinking solar disinfected water (incidence rate ratio* 0.64, 95% CI 0.39-1.0, rate ratio* 0.64, 95% CI 0.39-1.0, P P ) ) 0.071) 0.071) but not statistically significantbut not statistically significant
• Solar disinfection was not significantly Solar disinfection was not significantly associated with non-dysentery diarrhea associated with non-dysentery diarrhea risk overall (risk overall (P P = 0.419). = 0.419).
* IRR = Incident rate in test group / Incident rate in control group
S. Africa Results – cont’dS. Africa Results – cont’d• Incidence of dysentery was Incidence of dysentery was significantly significantly
associated with higher motivationassociated with higher motivation, defined , defined as 75% or better completion of diarrhea data.as 75% or better completion of diarrhea data.
• Compared with the control, participants with Compared with the control, participants with higher motivation achieved a higher motivation achieved a significant significant reduction in dysentery (incidence rate reduction in dysentery (incidence rate ratio (IRR = 0.36, ratio (IRR = 0.36, 95% CI 0.16-0.81, 95% CI 0.16-0.81, P P = = 0.014). However, there was no significant 0.014). However, there was no significant reduction in risk at lower levels of motivation.reduction in risk at lower levels of motivation.
S. Africa Results – cont’dS. Africa Results – cont’d• A statistically significant reduction in A statistically significant reduction in
dysentery was achieved only in dysentery was achieved only in households with higher motivation, households with higher motivation, showing that motivation is a significant showing that motivation is a significant determinant for measurable health determinant for measurable health gains.gains.
• SODIS works but only if you use it!SODIS works but only if you use it!
•Median height-for-age was significantly increased in those on SODIS, corresponding to an average of 1.3 cm taller over a 1-year period over the group as a whole (95% CI 0.54 to 2.2 cm, P=0.001).
•Median weight-for-age was similarly higher in those on SODIS, corresponding to a 0.4 kg heavier difference in weight after a year on SODIS (95% CI 0.16 to 0.64 kg, P<0.001).
• Anthropometric benefit only observed in Kenyan study. Probably because only area where we saw significant malnutrition.
• This is the first trial to show evidence of the effects of SODIS on childhood anthropometry & should alleviate concerns that the lower disease rates associated with household water treatment are the product of biased reporting rather than genuinely decreased incidence.