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Environ Pollut

Title:		Enrichment cultivation of VOC-degrading bacteria using diffusion bioreactor and development of bacterial-immobilized biochar for VOC bioremediation
Author(s):		Chaudhary DK; Park JH; Kim PG; Ok YS; Hong Y;
Address:		"Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong, 30019, Republic of Korea. Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea. Korea Biochar Research Center, APRU Sustainable Waste Management Program and Division of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea. Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong, 30019, Republic of Korea. Electronic address: yongseokhong@korea.ac.kr"
Journal Title:		Environ Pollut
Year:		2023
Volume:		20230117
Issue:
Page Number:		121089 -
DOI:		10.1016/j.envpol.2023.121089
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Volatile organic compounds (VOCs) have been globally reported at various sites. Currently, limited literature is available on VOC bioremediation using bacterial-immobilized biochar (BC-B). In this study, multiple VOC-degrading bacteria were enriched and isolated using a newly designed diffusion bioreactor. The most effective VOC-degrading bacteria were then immobilized on rice husk-derived pristine biochar (BC) to develop BC-B. Finally, the performances of BC and BC-B for VOCs (benzene, toluene, xylene, and trichloroethane) bioremediation were evaluated by establishing batch microcosm experiments (Control, C; bioconsortium, BS; pristine biochar, BC; and bacterial-immobilized biochar, BC-B). The results revealed that the newly designed diffusion bioreactor effectively simulated native VOC-contaminated conditions, easing the isolation of 38 diverse ranges of VOC-degrading bacterial strains. Members of the genus Pseudomonas were isolated in the highest (26.33%). The most effective bacterial strain was Pseudomonas sp. DKR-23, followed by Rhodococcus sp. Korf-18, which degraded multiple VOCs in the range of 52-75%. The batch microcosm experiment data showed that BC-B remediated the highest >90% of various VOCs, which was comparatively higher than that of BC, BS, and C. In addition, compared with C, the BS, BC, and BC-B microcosms abundantly reduced the half-life of various VOCs, implying a beneficial impact on the degradation behavior of VOCs. Altogether, this study suggests that a diffusion bioreactor system can be used as a cultivation device for the isolation of a wide range of VOC-degrading bacterial strains, and a compatible combination of biochar and bacteria may be an attractive and promising approach for the sustainable bioremediation of multiple VOCs"
Keywords:		"*Volatile Organic Compounds Biodegradation, Environmental Charcoal Bacteria Bacteria isolation Bacterial-immobilized biochar Biochar Bioremediation Diffusion bioreactor system Volatile organic compounds;"
Notes:		"MedlineChaudhary, Dhiraj Kumar Park, Joung-Ho Kim, Pil-Gon Ok, Yong Sik Hong, Yongseok eng England 2023/01/21 Environ Pollut. 2023 Mar 1; 320:121089. doi: 10.1016/j.envpol.2023.121089. Epub 2023 Jan 17"