Marine Biotechnologies and Environment, Laboratory Sciences Faculty, Chouaïb Doukkali University, El Jadida, Morocco.
Science Engineer Laboratory for Energy, National School of Applied Sciences, Chouaïb Doukkali University, El Jadida, Morocco.
Environ Sci Pollut Res Int. 2023 Oct;30(50):109481-109499. doi: 10.1007/s11356-023-29741-w. Epub 2023 Sep 29.
This research was undertaken to optimize the phenolic compound removal from Olive Mill Wastewater (OMW) by sawdust and red clay as natural adsorbents. Fractional factorial experimental design at 2 was used in order to optimize the experimental conditions for high removal efficiency. Statistics ANOVA analysis, Fisher's test, and Student's test suggested that the adsorbent dose has the most significant influence on polyphenol removal for both adsorbents. The maximum removal of polyphenols by sawdust reached 49.6% at 60 °C by using 60 g/L of adsorbent dose, pH 2, reaction time of 24 h, and agitation speed of 80 rpm. Whereas, for red clay, 48.08% of polyphenols removal was observed under the same conditions for sawdust except the temperature of 25 °C instead of 60 °C. In addition, the thermodynamic parameters suggested spontaneous process for both adsorbents, endothermic for the sawdust and exothermic for red clay. Furthermore, the phytotoxicity effect of OMW on durum wheat (Triticum turgidum L. var. durum) and white bean (Phaseolus vulgaris L.) seed germination was investigated. The obtained results showed that the untreated OMW inhibited the seed germination of T. turgidum and P. vulgaris seeds. OMW treatment with red clay followed by dilution (95% water) resulted in 87 and 30% germination of P. vulgaris and T. turgidum, respectively. While, the treatment of OMW with sawdust and dilution at 95% resulted in 51 and 26% germination of P. vulgaris and T. turgidum, respectively.
本研究旨在优化利用木屑和红粘土作为天然吸附剂从橄榄厂废水中去除酚类化合物。采用 2 因子析因实验设计以优化高去除效率的实验条件。方差分析、Fisher 检验和 Student 检验表明，吸附剂剂量对两种吸附剂的多酚去除率有最显著的影响。在 60°C 下，使用 60g/L 的吸附剂量、pH 值为 2、反应时间为 24 小时和搅拌速度为 80rpm，木屑的多酚去除率最高可达 49.6%。而对于红粘土，在相同条件下（除了温度为 25°C 而不是 60°C 外），观察到 48.08%的多酚去除率。此外，热力学参数表明两种吸附剂均为自发过程，木屑为吸热过程，而红粘土为放热过程。此外，还研究了 OMW 对硬粒小麦（Triticum turgidum L. var. durum）和白豆（Phaseolus vulgaris L.）种子萌发的植物毒性效应。研究结果表明，未经处理的 OMW 抑制了 T. turgidum 和 P. vulgaris 种子的萌发。用红粘土处理 OMW 后稀释（95%水）可使 P. vulgaris 和 T. turgidum 的萌发率分别达到 87%和 30%。而用木屑处理 OMW 并稀释至 95%时，P. vulgaris 和 T. turgidum 的萌发率分别为 51%和 26%。
