High pressure injection of chemicals in a gravel beach

Xiaolong Geng, Ali Abdollahi-Nasab, Chunjiang An, Michel C. Boufadel, Zhi Chen, Kenneth Lee

Research output: Contribution to journalArticlepeer-review

Abstract

The remediation of beaches contaminated with oil includes the application of surfactants and/or the application of amendments to enhance oil biodegradation (i.e., bioremediation). This study focused on evaluating the practicability of the high pressure injection (HPI) of dissolved chemicals into the subsurface of a lentic Alaskan beach subjected to a 5 m tidal range. A conservative tracer, lithium, in a lithium bromide (LiBr) solution, was injected into the beach at 1.0 m depth near the mid-tide line. The flow rate was varied between 1.0 and 1.5 L/min, and the resulting injection pressure varied between 3 m and 6 m of water. The concentration of the injected tracer was measured from four surrounding monitoring wells at multiple depths. The HPI associated with a flow rate of 1.5 L/min resulted in a Darcy flux in the cross-shore direction at 1.15 × 10−5 m/s compared to that of 7.5 × 10−6 m/s under normal conditions. The HPI, thus, enhanced the hydraulic conveyance of the beach. The results revealed that the tracer plume dispersed an area of ~12 m2 within 24 h. These results suggest that deep injection of solutions into a gravel beach is a viable approach for remediating beaches.

Original languageEnglish (US)
Article number525
Pages (from-to)1-12
Number of pages12
JournalProcesses
Volume7
Issue number8
DOIs
StatePublished - Aug 2019

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology

Keywords

  • Bioremediation
  • Exxon Valdez oil spill
  • High pressure injection
  • Tidal beach
  • Tracer study

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