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Health risk assessment associated with the reuse of compost, urine and greywater in agricultural field in sahelian climate.

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par Alexis Loukou BROU
Fondation 2iE - Master Environnement option Eau et Assainissement 2014
  

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2.2.2. Risk assessment from consumers

The risk more proven meets at the time of the consumption of lettuce is the C+TW treatment where Salmonella risk infection is 1.54x10-1, then GW treatment (9.42x10-4). Infection of risk from C+TW is higher than WHO recommendations (10-6). This high value could be explained by the fact that, compost was not mature before use to spread in the field. Therefore, when they irrigate the crop microorganisms may be regrow and then tosettle on the lettuce leaves thanks to the water drops(FAO and WHO, 2008). From GW, risk could be reduced if last irrigation before harvest must be considered (2 days) according to Shuval et al., (1997) and WHO, 2006a.Ascaris annual risks of infection C+TW and C+U+GW are equal (4.67x10-2), however, this probabilistic values are higher than WHO guideline values (2006). Risk could be reduced thanks to recommendation above given by WHO, (1998) concerning conservation of foods. Furthermore, according to Shuval et al., (1997), pathogens attached to plants will be inactivated withtime due to natural attrition and the effects of desiccation, UV irradiation, heat and biological competition.

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