Once the regulatory limits are fulfilled, the normal procedure
after biological treatment of wastewater is the direct discharge into
natural water matrixes (rivers, oceans, etc.). Nevertheless, more
and more countries are focusing their efforts to reutilize secondary
effluents in those requirements not demanding a high standard of
water quality (drinking water or water for the food industry). Thus,
recycled water can be used in toilet flushing, garden watering,
street washing, fire protection, etc. Even if more stringent standards
of quality are adopted, reclaimed wastewater can be used for agricultural
purposes in crop production (The on Site Consortium,
2008). For this purpose, oxidising agents like ozone or other advanced
oxidation processes based on its use are considered as
promising alternatives to conventional oxidation/disinfection tools
like chlorine and its derivatives (Lee et al., 2008).