Intrinsic and bioaugmented aerobic trichloroethene degradation at seven sites.
Aerobic biodegradation
Chloroethenes
Doubling time
Groundwater remediation
TCE
TCE, trichlorethene
Journal
Heliyon
ISSN: 2405-8440
Titre abrégé: Heliyon
Pays: England
ID NLM: 101672560
Informations de publication
Date de publication:
Feb 2023
Feb 2023
Historique:
received:
29
11
2022
revised:
31
01
2023
accepted:
01
02
2023
entrez:
27
2
2023
pubmed:
28
2
2023
medline:
28
2
2023
Statut:
epublish
Résumé
Trichloroethene (TCE) is one of the most prevalent contaminants in groundwater pollution worldwide. Aerobic-metabolic degradation of TCE has only recently been discovered at one field site. It has significant advantages over aerobic co-metabolism because no auxiliary substrates are required, and the oxygen demand is considerably lower. This study investigated the intrinsic degradation potential as well as the stimulation potential by bioaugmentation in microcosm experiments with groundwater from seven different sites contaminated with chloroethenes. An enrichment culture metabolizing TCE aerobically served as inoculum. The groundwater samples were inoculated with liquid culture in mineral salts medium as well as with immobilized culture on silica sand. Additionally, some samples were inoculated with groundwater from the site where the enrichment culture originated. The microcosms without inoculum proved the occurrence of aerobic TCE-metabolizing bacteria stimulated by the supply of oxygen in 54% of the groundwater samples. TCE degradation started in most cases after adaptation times of up to 92 d. The doubling time of 24 d indicated comparatively slow growth of the aerobic TCE degrading microorganisms. Bioaugmentation triggered or accelerated TCE-degradation in all microcosms with chlorothene concentrations below 100 mg L
Identifiants
pubmed: 36846709
doi: 10.1016/j.heliyon.2023.e13485
pii: S2405-8440(23)00692-8
pmc: PMC9946854
doi:
Types de publication
Journal Article
Langues
eng
Pagination
e13485Informations de copyright
© 2023 The Authors.
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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