Treatment of Olive Oil Mill Wastewater by UV-Light and UV/H2O2 System (Pages: 46-53)

Gassan Hodaifa1, Cristina Agabo1, Alberto J. Moya2, Rafael Pacheco2 and Soledad Mateo2

1Molecular Biology and Biochemical Engineering Department, Chemical Engineering Area, Faculty of Experimental Sciences, Universidad Pablo de Olaivde, ES-41013 Seville, Spain and 2Materials, Environmental and Chemical Engineering Department, Faculty of Experimental Sciences, Universidad de Jaén, 23071 Jaén, Spain



Abstract: Olive oil mills generates large volumes of wastewaters (OMW). The absence of legislation, which manages and obligates the treatment of OMW has led to the creation of large build-evaporation ponds as a solution for this environmental problem. The function of these ponds is the evaporation of wastewater during summer months. However, evaporation isn’t enough to eliminate all wastewater in the rafts and this fact allows the generation of a great volume of concentrate wastewater with high organic load (COD = 0.5- 38 g O2/L). The environmental impact produced by the accumulation of polluted wastewater demands the design of processes for OMW treatment. In this sense, the influence of ultraviolet light (UV) and the combined system of UV/H2O2, in the degradation of organic matter of OMW, were studied. UV-light application at a short time (<30 min) implies a removal values in COD = 15-22%, total carbon (TC), total organic carbon (TOC) and total nitrogen (TN) in the range 34% to 43%. The turbidity elimination was registered in the range 68% to 70%. In the case of combined UV/H2O2 system the removal percentages were 40-48% for COD, 39.4-51.9% for TC, 33.0-48.0% for TOC, 37.0-53.1% for TN, and 66.8-93.4% for turbidity.

Keywords: Olive oil industry, Wastewater, Advanced oxidation process, Treatment.