Optimization of continuous reactor at pilot scale for olive-oil mill wastewater treatment by Fenton-like process
2013
Hodaifa, Gassan | Ochando-Pulido, J.M. | Rodriguez-Vives, S. | Martinez-Ferez, A.
Reclamation of olive-oil mill wastewater (OMW) from two-phase extraction procedure was carried out in a continuous stirred tank reactor (CSTR) at a pilot plant scale by Fenton-like process. The effect of operating conditions such as pH, space–time, H₂O₂ and Fe(III) doses, as well as [FeCl₃]/H₂O₂] ratio on the efficacy of Fenton’s process was investigated. It is demonstrated that Fenton’s process can effectively degrade organic matter in OMW. In the start-up stage, Fenton reaction reached steady state within 3h. Oxidation of organic materials in OMW was pH dependent and the optimal pH was found to be 3. The optimum [FeCl₃]/[H₂O₂] ratio was in the range 0.026–0.058w/w, with Fe(III) concentration between 0.35 and 0.40gdm⁻³. The final values of COD and total phenols at the outlet of the pilot plant were close to 129mgO₂L⁻¹ ([COD]ᵢₙᵢₜᵢₐₗ=4017mgO₂dm⁻³), and 0.5mgdm⁻³ ([total phenols]ᵢₙᵢₜᵢₐₗ=66.2mgdm⁻³), respectively. Finally, the produced water can be used for irrigation or discharged directly into the municipal wastewater system for ulterior tertiary treatment.
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