Effect of ozone on secondary effluent treatment for reuse in agriculture

The results of secondary effluents ozonation from domestic sewages treatment plants in Havana, Cuba are presented. The ozone effect on some physico-chemical parameters was determined. The ozone gas concentration is the parameter, which exerts the greatest influence on the ozone transferred. The results indicated that ozonation of secondary effluents is a safe disinfection alternative for wastewaters reuse in agriculture or safe disposal, whose effectiveness depends on an adequate application. Therefore, effluents ozonisation can contribute to the environment protection and sustainable development. A preliminary economic comparison is performed between ozonation and chlorination treatments. An ozonation reactor design is proposed.