In this study, a synthetic phenol solution of water and raw olive mill wastewater (OMW) were considered to achieve purification of the aqueous streams from pollutants. Only OMW was initially submitted to a coagulation/flocculation process, to reduce the turbidity, phenols, and chemical oxygen demand (COD). This first treatment appeared to be mandatory in order to remove solids from wastewater, allowing the successive use of laboratory-made core-shell nanocomposites. In detail, the optimal coagulant concentration, i.e., chitosan, was 500 mg/L, allowing a reduction of the turbidity and the COD value by 90% and 33%, respectively. After this, phenol wastewater was tested for photocatalysis and then OMW was treated by employing the laboratory-made nanocomposites in a photoreactor equipped with visible light sources and using optimal catalyst concentrations, which allowed for an additional 45% reduction of the COD of the OMW. In addition to this, the effect of the operating temperature was investigated on the photocatalytic process, and suitable kinetic models proposed.

中文翻译：

---

纳米复合材料光催化通过顺序工艺纯化苯酚和真正的橄榄磨废水

在这项研究中，考虑了水和原始橄榄磨坊废水（OMW）的合成苯酚溶液，以实现从污染物中净化水流的目的。最初只有OMW经历了凝结/絮凝过程，以降低浊度，酚和化学需氧量（COD）。为了从废水中去除固体，这种第一处理似乎是强制性的，从而允许相继使用实验室制造的核壳纳米复合材料。详细地讲，最佳凝结剂浓度（即壳聚糖）为500 mg / L，可使浊度和COD值分别降低90％和33％。在这之后，测试了苯酚废水的光催化作用，然后通过在配备可见光源的光反应器中使用实验室制造的纳米复合材料并使用最佳催化剂浓度对OMW进行处理，从而使OMW的COD进一步降低了45％。除此之外，还研究了操作温度对光催化过程的影响，并提出了合适的动力学模型。