Dehmani Younes, Ed-Dra Abdelaziz, Zennouhi Omar, Bouymajane Aziz, Rhazi Filali Fouzia, Nassiri Laila, Abouarnadasse Sadik
Laboratory of Chemistry/Biology Applied to the Environment, Faculty of Sciences, Moulay Ismaïl University, BP 11201-Zitoune, Meknes, 50070, Morocco.
Team of Microbiology and Health, Laboratory of Chemistry-Biology Applied to the Environment, Moulay Ismail University Faculty of Science, BP 11201 Zitoune, Meknes, Morocco.
Heliyon. 2020 Jan 27;6(1):e03164. doi: 10.1016/j.heliyon.2020.e03164. eCollection 2020 Jan.
Oil mill wastewater (OMW) is the main liquid discharge from oil mills, it is considered as a dangerous pollutant due to its toxic chemical compounds which are unloaded directly in the environment without any treatment. The aims of this study were to evaluate the effectiveness of OMW adsorption on clay as a good method for the elimination of toxic chemical compounds and to study the application of treated OMW as an irrigation source in agricultural field. For this, Clay was collected from the city of Agourai (Meknes region, Morocco) and characterized by X-ray diffraction, X-ray fluorescence spectrometry, BET and FTIR analysis. Moreover, the treated OMW was analyzed using UHPLC-ESI-MS and the determination of total phenolic content (TPC) was also performed. However, the application of the treated OMW in agricultural field was performed by the determination of its effect on the germination of seeds (in vitro) and as a source of irrigation of plants (in situ). The results of this study showed that OMW had the following physicochemical characteristics: average pH of 4.88, TPC of 4.75 g/l, COD of 80 g/l, BOD5 of 18.72 g/l, conductivity of 16.05 cm-1, dry matter of 135.7 g/l and volatile matter of 58.7 g/l. The adsorption on clay had increased the pH from 4.88 to 6.14 and reduced significantly the organic matter (42% of COD and 57.4% of phenolic compounds). UHPLC-ESI-MS analysis showed the presence of a wide variety of organic compounds in OMW, with the appearance of new compounds after adsorption. Moreover, the use of treated OMW as a source of irrigation showed a significant effect on the germination of seeds and the growth of plants. From this study, we can conclude that the adsorption on clay is a good method for the treatment of OMW, which became non-toxic for environment and can be used as a source of irrigation in agricultural field.
榨油厂废水（OMW）是榨油厂的主要液体排放物，由于其有毒化学化合物直接排放到环境中且未经任何处理，被视为危险污染物。本研究的目的是评估OMW在粘土上的吸附效果，作为一种消除有毒化学化合物的良好方法，并研究处理后的OMW在农业领域作为灌溉水源的应用。为此，从阿古拉伊市（摩洛哥梅克内斯地区）采集了粘土，并通过X射线衍射、X射线荧光光谱、BET和FTIR分析对其进行了表征。此外，使用超高效液相色谱-电喷雾电离质谱（UHPLC-ESI-MS）对处理后的OMW进行了分析，并测定了总酚含量（TPC）。然而，处理后的OMW在农业领域的应用是通过测定其对种子发芽（体外）的影响以及作为植物灌溉水源（原位）来进行的。本研究结果表明，OMW具有以下理化特性：平均pH值为4.88，TPC为4.75 g/l，化学需氧量（COD）为80 g/l，五日生化需氧量（BOD5）为18.72 g/l，电导率为16.05 cm-1，干物质为135.7 g/l，挥发物为58.7 g/l。在粘土上的吸附使pH值从4.88提高到6.14，并显著降低了有机物含量（COD的42%和酚类化合物的57.4%）。UHPLC-ESI-MS分析表明，OMW中存在多种有机化合物，吸附后出现了新的化合物。此外，使用处理后的OMW作为灌溉水源对种子发芽和植物生长有显著影响。从本研究中，我们可以得出结论，在粘土上的吸附是处理OMW的一种好方法，它对环境变得无毒，可作为农业领域的灌溉水源。
