Application of pneumatic fracturing to enhance in situ bioremediation

Document Type

Article

Publication Date

1-1-1998

Abstract

A field pilot demonstration integrating pneumatic fracturing and in situ bioremediation was carried out in a gasoline-contaminated, low permeability soil formation. A pneumatic fracturing system was used to enhance subsurface air flow and transport rates, as well as to deliver soil amendments directly to the indigenous microbial populations. An in situ bioremediation zone was established and operated for a period of 50 weeks, which included periodic subsurface injections of phosphate, nitrate, and ammonium salts. Off-gas data indicated the formation of a series of aerobic, denitrifying, and methanogenic microbial degradation zones. Based on soil samples recovered from the site, 79% of soil-phase benzene, toluene, and xylenes (BTX) was removed by the integrated technology. From mass balance calculations, accounting for all physical losses, it was estimated that 85% of the total mass of BTX removed (based on mean concentration levels) was attributable to biodegradation. © 1998 by AEHS.

Identifier

0032023472 (Scopus)

Publication Title

Soil and Sediment Contamination

External Full Text Location

https://doi.org/10.1080/10588339891334203

ISSN

10588337

First Page

143

Last Page

162

Issue

2

Volume

7

Grant

N00014-92-J-1888

Fund Ref

Office of Naval Research

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