A Practical Approach to the Design, Monitoring, and Optimization of the Situ MTBE Aerobic Biobarriers

Johnson, Paul C.; Miller, Karen D.; Bruce, Cristin L.

doi:10.21236/ada429040

Cited by 1 publication

(1 citation statement)

References 8 publications

(9 reference statements)

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“…Generally, sites that have a sufficient electron acceptor demand to warrant active remediation have high hydrocarbon loads; thus, oxygen gas sparged into the groundwater at such sites is a cost-effective solution to meet the demand. Oxygen transfer efficiencies for oxygen gas sparging are dependent on site variables and delivery rates but are often an order of magnitude greater than for standard air sparging (using ambient air) and can vary widely, although some practitioners have assumed 100 percent transfer efficiency using pure oxygen gas (Johnson et al, 2010). The use of oxygen gas with 90+ percent purity results in much higher (than using ambient air) dissolved oxygen levels in groundwater, particularly when sparged into a deep aquifer.…”

Section: Aerobic Processesmentioning

confidence: 99%

A universal design approach for in situ bioremediation developed from multiple project sites

Fam

Falatko

Higgins

et al. 2012

Remediation Journal

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This article describes a design approach that has been developed for bioremediation of chlorinated volatile organic compound-impacted groundwater that is based upon experience gained during the past 17 years. The projects described in the article generally involve large-scale enhanced anaerobic dechlorination (EAD) and combined aerobic/anaerobic bioremediation techniques. Our design approach is based on three primary objectives: (1) selecting and distributing the proper additives (including bioaugmentation) within the targeted treatment zone; (2) maintaining a neutral pH (and adding alkalinity when needed); and (3) sustaining the desired conditions for a sufficient period of time for the bioremediation process to be fully completed. This design approach can be applied to both anaerobic and aerobic bioremediation systems. Site-specific conditions of hydraulic permeability, groundwater velocity, contaminant type and concentrations, and regulatory constraints will dictate the best remedial approach and design parameters for in situ bioremediation at each site.The biggest challenges to implementing anaerobic bioremediation processes are generally the selection and delivery of a suitable electron donor and the proper distribution of the donor throughout the targeted treatment zone. For aerobic bioremediation processes, complete distribution of adequate concentrations of a suitable electron acceptor, typically oxygen or oxygenyielding compounds such as hydrogen peroxide, is critical. These design approaches were developed based on understanding the biological processes involved and the mechanics of groundwater flow. They have evolved based on actual applications and results from numerous sites. An EAD treatment system, based on our current design approach, typically uses alcohol as a substrate, employs groundwater recirculation to distribute additives, and has an operational period of two to four years.An aerobic in situ treatment system based on our current design approach typically uses pure oxygen or hydrogen peroxide as an electron acceptor, may involve enhancements to groundwater flow for better distribution, and generally has an operational period of one to four years. These design concepts and specific project examples are presented for 17 sites. O

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Section: Aerobic Processesmentioning

confidence: 99%