Evaluation of hybrid treatments to produce high quality reuse water

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Four tertiary hybrid treatments to produce high quality reused water, fulfilling Brazilian drinking water regulations, from a slaughterhouse's secondary treated effluent were evaluated. The pilot plant with a capacity of 500 L h−1 was set up and consisted of these stages: pre-filtration system (cartridge filter 50 micron, activated carbon filter, cartridge filter 10 micron), oxidation (H2O2) or second filtration (ceramic filter, UF) followed by UV radiation (90 L h−1). The best combination was T4: pre-filtration followed by H2O2 addition and UV radiation (AOP H2O2/UV). Disinfection kinetics by T4 followed pseudo first-order kinetics: kT4 = 0.00943 s−1 or 0.00101 cm2 mJ−1. Three different zones (A, B, C) were observed in the UV254 degradation kinetics (pseudo-first order kinetics): k' decreased over time (k′A > k′B > k′C).

Keywords: AOP, H2O2/UV, kinetics, pilot plant, slaughterhouse wastewater, tertiary hybrid treatments

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