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

Zhaoyun Wang; Liyong Hu; Jiamei He; Gang Zhou; Zhenghui Chen; Zeyu Wang; Jun Chen; Kashif Hayat; Dzmitry Hrynsphan; Savitskaya Tatsiana

doi:10.1016/j.biortech.2023.128600

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

Bioresour Technol. 2023 Mar:372:128600. doi: 10.1016/j.biortech.2023.128600. Epub 2023 Jan 9.

Authors

Affiliations

¹ College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.
² Key Laboratory of Pollution Exposure and Health Intervention Technology, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310021, China.
³ Key Laboratory of Pollution Exposure and Health Intervention Technology, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310021, China; College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310021, China. Electronic address: bec@zjut.edu.cn.
⁴ School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
⁵ Research Institute of Physical and Chemical Problems, Belarusian State University, Minsk 220030, Belarus.

PMID: 36634880
DOI: 10.1016/j.biortech.2023.128600

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^-1n-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.

Keywords: Bamboo charcoal-polyurethane composite; Biofilm; N, N-Dimethylacetamide; Rotating drum biofilter; n-Hexane.

MeSH terms

Charcoal*
Environmental Pollutants*
Filtration
Polyurethanes

Substances

Charcoal
n-hexane
dimethylacetamide
Polyurethanes
Environmental Pollutants