Development of preferential flow in bioclogging of porous media

Engesgaard, Peter; Holm, Jesper; Jensen, Karsten H.; Henze, Mogens; Albrechtsen, Hans‐Jørgen

doi:10.1016/s0167-5648(02)80144-7

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Bioclogging also increases the cost of operation and maintenance of a bioremediation project, especially when rehabilitation of wells is necessary. 24,32,33 Several strategies tested to minimize bioclogging during in situ TCE aerobic cometabolism include: (i) decreasing the pulse frequency of the metabolic organic substrate (e.g., toluene, propane), (ii) alternating delivery of the metabolic organic substrate and O 2 , or (iii) adding the chemical oxidant, hydrogen peroxide. 24,28 Additionally, when surfactants are added to facilitate TCE dissolution into the aqueous phase, biomass aggregation and distribution may also be decreased to some extent.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For example, heterotrophic microorganisms consuming simple hydrocarbons have a biomass yield coefficient, Y , on the order of 0.42 g cells per g substrate. , Consequently, the growth of heterotrophic native and/or inoculated strains during aerobic cometabolism can cause biofouling and bioclogging of injection wells or adjacent areas. , Bioclogging reduces the soil porosity and permeability, which negatively affect substrate distribution in the subsurface and contaminant treatment efficacy. Bioclogging also increases the cost of operation and maintenance of a bioremediation project, especially when rehabilitation of wells is necessary. ,, …”

Section: Introductionmentioning

confidence: 99%

“…Bioclogging also increases the cost of operation and maintenance of a bioremediation project, especially when rehabilitation of wells is necessary. 24 , 32 , 33…”

Section: Introductionmentioning

confidence: 99%

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Acetylene Tunes Microbial Growth During Aerobic Cometabolism of Trichloroethene

Skinner,

Palar,

Allen

et al. 2024

Environ. Sci. Technol.

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Microbial aerobic cometabolism is a possible treatment approach for large, dilute trichloroethene (TCE) plumes at groundwater contaminated sites. Rapid microbial growth and bioclogging pose a persistent problem in bioremediation schemes. Bioclogging reduces soil porosity and permeability, which negatively affects substrate distribution and contaminant treatment efficacy while also increasing the operation and maintenance costs of bioremediation. In this study, we evaluated the ability of acetylene, an oxygenase enzyme-specific inhibitor, to decrease biomass production while maintaining aerobic TCE cometabolism capacity upon removal of acetylene. We first exposed propane-metabolizing cultures (pure and mixed) to 5% acetylene (v v–1) for 1, 2, 4, and 8 d and we then verified TCE aerobic cometabolic activity. Exposure to acetylene overall decreased biomass production and TCE degradation rates while retaining the TCE degradation capacity. In the mixed culture, exposure to acetylene for 1–8 d showed minimal effects on the composition and relative abundance of TCE cometabolizing bacterial taxa. TCE aerobic cometabolism and incubation conditions exerted more notable effects on microbial ecology than did acetylene. Acetylene appears to be a viable approach to control biomass production that may lessen the likelihood of bioclogging during TCE cometabolism. The findings from this study may lead to advancements in aerobic cometabolism remediation technologies for dilute plumes.

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