Tertiary treatment of slaughterhouse effluent: degradation kinetics applying UV radiation or H₂O₂/UV Available to Purchase

In some Brazilian regions, surface water has become scarce, e.g. semi arid climate areas and densely populated and industrial areas, where water over-exploitation and/or fluvial pollution has been more common. Advanced oxidative processes (AOP) provide treated water as a source of reuse water even with the characteristics of drinking water enabling water reuse practices also in food industries. The secondary wastewater of a slaughterhouse was the water source for a tertiary treatment study evaluating the kinetics of the photo-induced degradation of color and UV₂₅₄ under UV radiation with and without the addition of H₂O₂. The proximity of the k′ values of color and UV₂₅₄ degradation by UV indicates that the compounds responsible for color may be the same content measured by UV₂₅₄. The H₂O₂/UV treatment was 5.2 times faster than simple UV in removing aromatic compounds. The degradation kinetics of aromatic compounds in both treatments followed a pseudo-first order law. The pseudo-first order constant for H₂O₂/UV and UV treatments were k_UV254^′=0.0306 min⁻¹ and k_UV254^′=0.0056 min⁻¹, respectively.