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#groundwater cleanup

2 public questions tagged with this topic.

Bioremediation

Biosparging involves:

Biosparging constitutes in situ groundwater remediation targeting dissolved and sorbed petroleum hydrocarbons in saturated zone where natural oxygen typically depleted below 1 mg per L. Technology injects air, pure oxygen or microbubble oxygen-emitters at pressures slightly above hydrostatic 5 to 15 psi through wells placed 5 to 10 feet below plume. Bubbles rising dissolve oxygen up to 8 to 10 mg per L per Henry's law and partition volatile BTEX upward to vadose zone for capture by soil vapor extraction. Aerobic bacteria Pseudomonas putida and Rhodococcus carrying xylene monooxygenase and cate

Ref: EPA Biosparging Design Guidance 1994; Leeson et al. Air Sparging Principles; PubMed biosparging review PMID 10463012.

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Bioremediation

Bioventing is mainly used for remediation of:

Bioventing has emerged over past three decades as leading cost-effective in situ technology for vadose zone soils contaminated with mid-range and light petroleum hydrocarbons such as diesel, jet fuel, gasoline and BTEX compounds frequently leaked from underground storage tanks. Unsaturated soils typically harbor indigenous populations of hydrocarbonoclastic genera Alcanivorax, Pseudomonas, Rhodococcus and Mycobacterium carrying genes alkB alkane monooxygenase, CYP153 cytochrome P450, and catechol dioxygenases requiring molecular oxygen both as terminal electron acceptor and as cosubstrate for

Ref: Leeson & Hinchee EPA Bioventing Principles and Practice 1997; EPA Bioventing design manual; PubMed BTEX bioventing.

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