Enhanced biodegradation of PAHs in historically contaminated soil by M. gilvum inoculated biochar

Chemosphere
Bijing XiongChao Cai

Abstract

The inoculation of rice straw biochar with PAH-degrading Mycobacterium gilvum (1.27 × 10(11) ± 1.24 × 10(10) cell g(-1)), and the subsequent amendment of this composite material to PAHs contaminated (677 mg kg(-1)) coke plant soil, was conducted in order to investigate if would enhance PAHs biodegradation in soils. The microbe-biochar composite showed superior degradation capacity for phenanthrene, fluoranthene and pyrene. Phenanthrene loss in the microbe-biochar composite, free cell alone and biochar alone treatments was, respectively, 62.6 ± 3.2%, 47.3 ± 4.1% and non-significant (P > 0.05); whereas for fluoranthene loss it was 52.1 ± 2.3%; non-significant (P > 0.05) and non-significant (P > 0.05); and for pyrene loss it was 62.1 ± 0.9%; 19.7 ± 6.5% and 13.5 ± 2.8%. It was hypothesized that the improved remediation was underpinned by i) biochar enhanced mass transfer of PAHs from the soil to the carbonaceous biochar "sink", and ii) the subsequent degradation of the PAHs by the immobilized M. gilvum. To test this mechanism, a surfactant (Brij 30; 20 mg g(-1) soil), was added to impede PAHs mass transfer to biochar and sorption. The surfactant increased solution phase PAH concentrations and significantly (P < 0.05) reduced PAH d...Continue Reading

Citations

Sep 16, 2019·Environmental Geochemistry and Health·Andrey V GorovtsovJun Yao
Nov 3, 2020·The Science of the Total Environment·Zhansaya AssilAndrew Free
Dec 24, 2018·The Science of the Total Environment·Shao-Heng LiuJian-Jun Tao
May 16, 2021·Bioresource Technology·Yuqi LiuLin Xiao
Jul 16, 2021·Environmental Science and Pollution Research International·Jonathan W C Wong, Uchenna O Ogbonnaya
Dec 24, 2021·Critical Reviews in Biochemistry and Molecular Biology·Kumari Uma MahtoSurajit Das

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