Bisphenol A (BPA) and p-cresol are two phenolic compounds present in industrial wastewater and they are harmful to the environment. Electrochemical oxidation is a technology that has the ease of coupling to other treatment systems and is environmentally friendly. In this study, electrochemical oxidation of 100 mg/L of BPA and 50 mg/L of p-cresol were tasted using Boron Doped diamond (BDD) anodes. The results aim that the pseudo-first order kinetic constants (k) had the same order of magnitude for both compounds. Slightly higher values of k were obtained when using a J of 250 A/m2 than other conditions, removing the pollutants in less than 120 min; while the mineralization was completed around 240 and 210 min, respectively. To compare the energy consumption, the parameter Electrical Energy per Order was used, obtaining that to eliminate 90% of the compounds it is required between 6-8 kW·h/m3·order and 60 kW·h/m3·order for the mineralization.

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This study shows the effectiveness of the wastewater treatment from a municipal slaughterhouse undergone to a previous biological treatment applying a sequence of stages, reaching a 75% of elimination of the COD using sedimentation in combination of coagulation-flocculation, using 0.5 g/L FeCl3 which is one of the best known inorganic coagulants. Then, the elimination of COD was around 98% adding the Fenton process where 1,000 mg/L H2O2 and FeSO4 are used. In addition to the COD, other water quality parameters were measured to evaluate the level of purification of the test samples, such as solids of different types, pH, DOC and so on. With the above, it can be noted that the Fenton process had a slight improvement in the effluent quality by using a solar concentrator in the now called photo-Fenton process, reaching around 99% of COD removal (0.36 g/L), 91% of total suspended solids (0.32 g/L) and 89% of DOC (0.20 g/L). These results were the best achieved within a proposed treatment train for this type of complex wastewater. Moreover, this last part of the process adds an improvement, by the usage of renewable energy sources such as sunlight.