Synchronously enhanced biofilm formation and <i>m</i>-dichlorobenzene removal in biotrickling filters by rhamnolipid chelating rare earth elements

Yang, Bairen; Wang, Jiajie; Shang, Qingqing; Sun, Zhuqiu; Wu, Yifan

doi:10.1080/26395940.2022.2151516

Cited by 1 publication

(1 citation statement)

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“…Several biological treatment technologies have shown promise in the removal of halogenated compounds. These technologies include bioscrubbers (e.g., trichloroethylene [TCE] and 1,2-dichloroethylene [1,2-DCE]) [ 5 , 6 , 7 ], biotrickling filters (e.g., o-chlorotoluene and m-dichlorobenzene) [ 8 , 9 ], biofilters (e.g., chlorobenzene and TCE) [ 10 , 11 ] and biodegradation.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Genomic Analysis of 3-Chlorobenzoate-Degrading Bacteria from Soil

et al. 2023

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The compound 3-chlorobenzoate (3-CBA) is a hazardous industrial waste product that can harm human health and the environment. This study investigates the physiological and genetic potential for 3-chlorobenzoate (3-CBA) degradation. Six 3-CBA Gram-negative degraders with different degradation properties belonging to the genera Caballeronia, Paraburkholderia and Cupriavidus were isolated from the soil. The representative strains Caballeronia 19CS4-2 and Paraburkholderia 19CS9-1 showed higher maximum specific growth rates (µmax, h−1) than Cupriavidus 19C6 and degraded 5 mM 3-CBA within 20–28 h. Two degradation products, chloro-cis,cis-muconate and maleylacetate, were detected in all isolates using high-performance liquid chromatography and mass spectrometry. Genomic analyses revealed the presence of cbe and tfd gene clusters in strains 19CS4-2 and 19CS9-1, indicating that they probably metabolized the 3-CBA via the chlorocatechol ortho-cleavage pathway. Strain 19C6 possessed cbe genes, but not tfd genes, suggesting it might have a different chlorocatechol degradation pathway. Putative genes for the metabolism of 3-hydroxybenzoate via gentisate were found only in 19C6, which utilized the compound as a sole carbon source. 19C6 exhibited distinct characteristics from strains 19CS4-2 and 19CS9-1. The results confirm that bacteria can degrade 3-CBA and improve our understanding of how they contribute to environmental 3-CBA biodegradation.

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