College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.
Key Laboratory of Pollution Exposure and Health Intervention Technology, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310021, China.
Bioresour Technol. 2023 Mar;372:128600. doi: 10.1016/j.biortech.2023.128600. Epub 2023 Jan 9.
n-Hexane and N, N-dimethylacetamide (DMAC) are two major volatile organic compounds (VOCs) discharged from the pharmaceutical industry. To enhance DMAC-facilitated n-hexane removal, we investigated the simultaneous removal of multiple pollutants in a rotating drum biofilter packed with bamboo charcoal-polyurethane composite. After adding 800 mg·L DMAC, the n-hexane removal efficiency increased from 59.4 % to 83.1 % under the optimized conditions. The maximum elimination capacity of 10.0 g·m·hn-hexane and 157 g·m·h DMAC were obtained. The biomass of bamboo charcoal-polyurethane and the ratio of protein-to-polysaccharide in extracellular polymeric substances were significantly increased compared with the non-DMAC stage, which is attributed to increased carbon utilization. In addition, Na K-ATPase was positively correlated with increasing electron transport system activity, which was 1.98 and 1.36 times greater. Hydrophilic DMAC improved the bioavailability of hydrophobic n-hexane and benefited bacterial metabolism. Co-degradation of n-hexane and DMAC system can be used for other volatile organic pollutants.
正己烷和 N, N-二甲基乙酰胺 (DMAC) 是医药行业排放的两种主要挥发性有机化合物 (VOCs)。为了提高 DMAC 促进的正己烷去除效果，我们研究了在装有竹炭-聚氨酯复合材料的旋转滚筒生物滤池中同时去除多种污染物。在添加 800mg·L DMAC 后，在优化条件下，正己烷去除效率从 59.4%提高到 83.1%。获得了 10.0g·m·h正己烷和 157g·m·h DMAC 的最大去除容量。与非 DMAC 阶段相比，竹炭-聚氨酯的生物量和胞外聚合物中蛋白质与多糖的比例显著增加，这归因于碳的利用增加。此外，Na K-ATPase 与电子传递系统活性的增加呈正相关，分别增加了 1.98 和 1.36 倍。亲水性 DMAC 提高了疏水性正己烷的生物利用度，有利于细菌代谢。正己烷和 DMAC 体系的共降解可用于其他挥发性有机污染物。
