Use of Ozone in Wastewater Treatment to Produce Water Suitable for Irrigation |
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Authors: | Sonia B Martínez Jerónimo Pérez-Parra Ricardo Suay |
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Affiliation: | (1) IAV Hassan II, Km 3 route de Taroudant, Agadir Principale, BP 773, Agadir, 80000, Morocco |
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Abstract: | The use of ozone to disinfect sewage is becoming increasingly important, especially when a high degree of treatment is required.
Ozone is a strong disinfectant with a high oxidation potential and is one of the most effective ways of inactivating pathogens.
In order to observe and evaluate the effect of this disinfectant on the physical, chemical and microbiological characteristics
of wastewaters, we analyzed the effluent input and output of an ozone disinfection plant located in Almeria, southeast Spain.
The ozone input rate is adjusted according to the residual ozone content in the effluent output. The effluent is currently
reused to irrigate vegetable crops. Another objective of this study has therefore been to verify the adequacy of this water
treated process for preparing water for this purpose. Among the results obtained, it is important to highlight the fact that
the ozone disinfection treatment was sufficient to inactivate faecal coliforms. We achieved reductions in these pathogens
of around 89%. This treatment was respectful towards elements that give the reuse of effluent an added value in irrigation
(N, P, K, etc) and also kept the quality of the waters within the authorized limits. Thus, we achieved up to 88% removal of
COD, a maximum 68% removal of BOD5 and up to 75% removal of suspended solids. Based on the results of the parameters analyzed in this ozonized effluent, we
concluded that ozone-treated water is suitable for reuse in the irrigation of fresh consumption crops in accordance with the
guidelines established in related legislation. |
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