Department of Chemical Engineering, University of Granada, Avenida Fuentenueva s/n, 18071, Granada, Spain.
Department of Chemical Engineering, University of Granada, Avenida Fuentenueva s/n, 18071, Granada, Spain.
J Environ Manage. 2022 Aug 15;316:115227. doi: 10.1016/j.jenvman.2022.115227. Epub 2022 May 8.
This research is focused on modelling and optimization of the performance of a 'green procedure' based on microfiltration (MF) technology, for recovery of high added-value antioxidant compounds (TACs) from two-phase olive-oil washing wastewater (OOWW) and its treatment. Concern of olive oil industry to improve the production process in line with Circular Economy is vital to make it respectful with the environment including the management of the generated effluents. Key operational factors of the MF process were studied, modelled and optimized by multifactorial statistical analysis. Box-Behnken design was implemented and data analyzed by ANOVA and interpreted by RSM methodology. MF flux was ulteriorly modelled by a second-grade quadratic fitting equation comprising the significant operating variables, being them pressure and tangential velocity. Optimized flow achieved 10962.4 L/hm at 8.5 bar, 4.2 L/min tangential velocity, ambient temperature (25 °C) and raw pH (5.13). Finally, multiple-response permitted to optimize up to 67% TSS rejection and minimum rejection of TACs of 22.9%, upon 3.57 bar, 4.2 m/s, 23.4 °C and effluent pH of 5.1, meaning the recovery of 77.1% of TACs from OOWW in the permeate stream, up to 1207.1 mg/L. Results show that the proposed process allows a reduction in energy consumption by using the raw effluent with unmodified pH and ambient temperature.
本研究专注于基于微滤（MF）技术的“绿色工艺”性能建模和优化，以从两相橄榄油洗涤废水（OOWW）及其处理中回收高附加值抗氧化化合物（TACs）。橄榄油行业关注的是提高生产工艺，以符合循环经济，这对于尊重环境至关重要，包括处理产生的废水。MF 工艺的关键操作因素通过多因素统计分析进行了研究、建模和优化。实施了 Box-Behnken 设计，并通过 ANOVA 分析数据，并通过 RSM 方法进行解释。MF 通量通过包含显著操作变量的二级二次拟合方程进一步建模，这些变量为压力和切向速度。在 8.5 巴、4.2 升/分钟切向速度、环境温度（25°C）和原始 pH（5.13）下，优化后的流量达到 10962.4 L/hm。最后，多响应允许优化 TSS 去除率高达 67%，TAC 最小去除率为 22.9%，在 3.57 巴、4.2 m/s、23.4°C 和流出液 pH 为 5.1 的条件下，意味着从 OOWW 中回收 77.1%的 TACs 到渗透液中，高达 1207.1mg/L。结果表明，该工艺允许使用未改性 pH 和环境温度的原始废水来减少能源消耗。
