Department of Chemical Engineering, University of Granada, 18071 Granada, Spain.
J Hazard Mater. 2013 Dec 15;263 Pt 1:158-67. doi: 10.1016/j.jhazmat.2013.07.015. Epub 2013 Jul 17.
In this work, complete reclamation of the olive mill effluents coming from a two-phase olive oil extraction process (OME-2) was studied on a pilot scale. The developed depuration procedure integrates an advanced oxidation process based on Fenton's reagent (secondary treatment) coupled with a final reverse osmosis (RO) stage (purification step). The former aims for the removal of the major concentration of refractory organic pollutants present in OME-2, whereas the latter provides efficient purification of the high salinity. Complete physicochemical composition of OME-2 after the secondary treatment was examined, including the particle size distribution, organic matter gradation and bacterial growth, in order to assess the selection of the membrane and its fouling propensity. Hydrodynamics and selectivity of the membrane were accurately modelized. Upon optimization of the hydrodynamic conditions, the RO membrane showed stable performance and fouling problems were satisfactorily overcome. Steady-state permeate flux equal to 21.1 L h(-1)m(-2) and rejection values up to 99.1% and 98.1% of the organic pollutants and electroconductivity were respectively attained. This ensured parametric values below standard limits for reuse of the regenerated effluent, e.g. in the olives washing machines, offering the possibility of closing the loop and thus rending the production process environmentally friendly.
在这项工作中，我们在中试规模上研究了从两相橄榄油提取工艺（OME-2）中产生的橄榄厂废水的完全回收。所开发的净化程序集成了基于芬顿试剂的高级氧化工艺（二级处理），并结合了最终的反渗透（RO）阶段（净化步骤）。前者旨在去除 OME-2 中存在的主要浓度的难处理有机污染物，而后者则提供高盐度的有效净化。为了评估膜的选择及其污染倾向，对二级处理后 OME-2 的完整理化组成进行了检查，包括粒径分布、有机物分级和细菌生长。对膜的流体动力学和选择性进行了准确的模拟。在优化流体动力学条件后，RO 膜表现出稳定的性能，并很好地克服了污染问题。稳定状态下的渗透通量达到 21.1 L h(-1)m(-2)，对有机污染物和电导率的截留率分别达到 99.1%和 98.1%。这确保了再生废水的再利用参数值低于标准限值，例如在橄榄清洗机中，从而有可能实现循环利用，使生产过程更加环保。
