Enhancing the biological reductive dechlorination of trichloroethylene with PHA from mixed microbial cultures (MMC)
نویسندگان
چکیده
The biological reductive dechlorination (BRD) process is often limited by the lack of suitable electron donors, requiring supply long-lasting substrates to enhance metabolism. Among others, polyhydroxyalkanoates (PHA) are a particularly interesting slow-release source electron-donors, being entirely biodegradable polyesters. Generally, industrial PHA production processes based on pure culture fermentation with high related costs. In recent years, innovative and cost-effective from mixed microbial cultures (MMC) waste feedstocks attracting considerable attention. This research, for first time, investigated effect distinctive types BRD trichloroethylene (TCE), in continuous-flow lab-scale system using two materials different purity grade produced MMC at pilot scale comparison commercial culture. Promising results have been obtained non-extracted MMC-PHA, material consisting both (56%, w/w) cells, constant acids over 110 days, which stimulated nearly complete TCE non-toxic ethene as main byproduct (approximately 92%). Dehalococcoides mccartyi was microorganism responsible process, representing ≥ 54.05% bacterial population, mainly carrying dehalogenase genes tceA vcrA (≥9.17E+08 ≥2.01E+07 gene copies/g or sand, respectively). finding suggests possibility directly use PHA-rich biomass deriving does not require any polluting expensive extraction procedures, novel field groundwater remediation noticeable economic environmental advantages.
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ژورنال
عنوان ژورنال: Journal of environmental chemical engineering
سال: 2022
ISSN: ['2213-2929', '2213-3437']
DOI: https://doi.org/10.1016/j.jece.2021.107047