A comparison among different wastewater disinfection systems: Experimentalresults

In this work, the efficiency and the applicability of some disinfection sys tems for biologically treated wastewater were studied. The following disinf ection processes were considered: peracetic acid (PAA), chlorine dioxide, o zone, UV light. These treatments were chosen as an alternative to chlorinat ion. Their applicability was investigated considering both the removal effi ciency of microorganisms and the qualitative changes in the treated effluen t (e.g. presence of disinfectant residues, disinfection by-products, etc.). The different processes were tested by means of pilot scale plants working in parallel; in fact they were fed with the same wastewater (secondary eff luent of a municipal wastewater treatment plant). Finally, an economical an alysis was carried out.