Efficient degradation of naproxen in a three dimensional biofilm electrode magnetism reactor (3DBEMR): Removal performance and microbial community

• Published in: Bioresource technology 2022-02, Vol.346, p.126653-126653, Article 126653
• Main Authors: Li, Zichen, Feng, Yan, Chang, Lei, Long, Yingying, Suo, Ning, Wang, Zhongwei, Yu, Yanzhen
• Format: Article
• Language: English
• Subjects: Biofilms; Bioreactors; Electrodes; Microbial diversity, Microbial community structure; Microbiota; Naproxen; Superposition effect of electro-magnetic
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2021.126653

[Display omitted] •A three-dimensional biofilm electrode magnetism reactor (3DBEMR) was established.•Removal rate of naproxen was enhanced greatly by 3DBEMR.•Electric field played a important role for naproxen degradation in 3DBEMR.•Magnetic field played a strengthening or assisting role in 3DBEMR.•Biological community was changed because of the electro-magnetic superposition. A three-dimensional biofilm electrode magnetism reactor (3DBEMR) was constructed to removal naproxen (NPX). This study evaluated 3DBEMR performance in removal of refractory NPX, while also discussing the effect of the electro-magnetic superposition on microbial community by high throughput sequencing. Results indicated that 3DBEMR’s average removal rate for NPX stood at 88.36%, representing an increase by 75.24%, 65.03% and 12.36%, respectively, compared to 3DBR (Three-Dimensional Biofilm Reactor), 3DBMR (Three-Dimensional Biofilm Magnetism Reactor) and 3DBER (Three-Dimensional Biofilm Electrode Reactor). This was attributed to the influence of electro-magnetic adsorption, electro-oxidaton/catalysis, and electro-magnetic biodegradation. Another major contributing factor to NPX removal was the presence in 3DBEMR of high-abundance genera such as Rhodobacter, Porphyrobacter, Methyloversatilis, Sphingopyxis,Bosea, Singulisphaera, Sphingomonas. Therefore, the 3DBEMR was successfully demonstrated to be a flexible and effective technique in NPX degradation, which would help to better understand the effect of superposition of electric and magnetic fields on microbial community.