The olive growing in Tunisia has an economic dominance and agricultural importance. However, the huge extraction of olive oil generates a large quantity of olive mill wastewater (OMW), which is discharged to the surroundings. The highly polluting potential (organic load) of OMW threatens the environment and requires an urgent solution. Supercritical fluid extraction (SFE) is a green extraction method that can be applied to purify OMW and, at the same time, to isolate a high quality oil from this wastewater.

In order to explore and to valorize the compositions of Olive mill wastewater (OMW), extraction in different solvents (supercritical CO2, hexane) was carried out and chemical composition of the extracted oils were established by GC-FID. The Tunisia OMW were collected from two different zones namely Sousse and Sfax.

In this work, we have investigated the effects pressure (P) and temperature (T) on the yield and the quality of oil. The suitable conditions for the extraction of oil from lyophilized OMW by Supercritical carbon dioxide (SC-CO2) were found to be the pressure of 30 MPa and the temperature of 60 °C. In order to simulate the process, the model of broken and intact cells (Sovova’s model) was applied. The model well represented the experimental data.

Oil yields ranged from 21.3 % to 33.87 % depending on the extraction solvent used. Monounsaturated fatty acids (MUFA) were the major compounds of the oils, based on the fatty acid analysis. Chromatographic analysis revealed that the chemical compositions vary from one region to another, extraction solvent as well as the conditions of pressure and temperature.

突尼斯的橄榄种植具有经济主导地位和农业重要性。然而，橄榄油的大量提取会产生大量的橄榄厂废水（OMW），这些废水被排放到周围环境中。OMW 的高污染潜力（有机负荷）威胁着环境，需要紧急解决。超临界流体萃取 (SFE) 是一种绿色萃取方法，可用于净化 OMW，同时从该废水中分离出高质量的油。

为了探索和评估橄榄厂废水 (OMW) 的成分，在不同溶剂（超临界 CO2、己烷）中进行萃取，并通过 GC-FID 确定萃取油的化学成分。突尼斯 OMW 来自两个不同的区域，即苏塞和斯法克斯。

在这项工作中，我们研究了压力 (P) 和温度 (T) 对石油产量和质量的影响。通过超临界二氧化碳（SC-CO2）从冻干的OMW中提取油的合适条件是30 MPa的压力和60°C的温度。为了模拟该过程，应用了破碎和完整细胞模型（Sovova 模型）。该模型很好地代表了实验数据。

取决于所使用的萃取溶剂，油的产率在 21.3% 到 33.87% 之间。根据脂肪酸分析，单不饱和脂肪酸 (MUFA) 是油的主要化合物。色谱分析表明，不同地区的化学成分、萃取溶剂以及压力和温度条件不同。