Environmental Group, Department of Energy, Materials and Energy Research Center, P.O. Box 31787-316, Karaj, Alborz, Iran.
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran.
Bioprocess Biosyst Eng. 2023 Nov;46(11):1613-1625. doi: 10.1007/s00449-023-02923-z. Epub 2023 Sep 1.
This study investigated the MBR performance, sludge morphology, and membrane fouling potential in treating sunflower oil refinery wastewater containing high oleic acid at three different SRTs of 10 days, 40 days, and infinite. The analysis of mixed liquor morphology including sludge volume index, PSD, EPS, and SMP showed that the sludge flocs compressibility and bioflocculation considerably improved at 40-days SRT. Additionally, at this SRT, the mixed liquor O&G, COD, and SMP accumulation were low, and the microbial activity and COD removal were enhanced. The gas chromatography/mass spectrometry analysis results confirmed the formation of three different new compounds related to non-readily biodegradable recalcitrant oily compounds and SMP at all SRTs. The analysis of mixed liquor EPS, PSD, SMP, and effluent COD at three different SRTs suggests that under the industrial conditions of MBR operation treating SORW with high oleic acid, the optimal operating conditions are predicted to be at 40-days SRT.
本研究考察了在三种不同的 SRT（10 天、40 天和无限）下，用 MBR 处理含高油酸葵花籽油精炼废水的性能、污泥形态和膜污染潜力。对混合液形态的分析，包括污泥体积指数、PSD、EPS 和 SMP，表明在 40 天 SRT 下，污泥絮体的可压缩性和生物絮凝性有了显著提高。此外，在该 SRT 下，混合液中的 O&G、COD 和 SMP 积累较低，微生物活性和 COD 去除率得到提高。气相色谱/质谱分析结果证实，在所有 SRT 下，形成了三种与不易生物降解的顽固油性化合物和 SMP 有关的不同新化合物。对三种不同 SRT 下的混合液 EPS、PSD、SMP 和出水 COD 的分析表明，在 MBR 处理高油酸 SORW 的工业运行条件下，预测最佳运行条件为 40 天 SRT。
