Mechanisms of N, N-dimethylacetamide-facilitated n-hexane removal in a rotating drum biofilter packed with bamboo charcoal-polyurethane composite. (March 2023)

• Record Type: Journal Article
• Authors: Wang, Zhaoyun; Hu, Liyong; He, Jiamei; Zhou, Gang; Chen, Zhenghui; Wang, Zeyu; Chen, Jun; Hayat, Kashif; Hrynsphan, Dzmitry; Tatsiana, Savitskaya
• Is Part Of: Bioresource technology. Volume 372(2023)
• Publication Date: 2023-03
• Subjects: Bamboo charcoal-polyurethane composite -- Biofilm -- n-Hexane -- N, N-Dimethylacetamide -- Rotating drum biofilter; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2023.128600
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: n -Hexane and DMAC were removed by RDB packed with BC-PU simultaneously. DMAC enhanced the performance of RDB for n -hexane removal. DMAC promoted microbial ATPase and electron transport system activity. The Mycobacterium sp . and Hyphomicrobium sp . were found as the dominating bacteria. Metabolites of DMAC including N -methylacetamide and acetic acid were detected. Abstract: 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 −1 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 −3 ·h −1 n -hexane and 157 g·m −3 ·h −1 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.