Results from Two Direct Hydrogen Delivery Field Tests for Enhanced Dechlorination

TRRP Training: 2022 Program

presented by: GSI Environmetal Inc.

Texas Risk Reduction Program regulations (TRRP; 30 TAC 350) establish consistent risk-based protocols for assessment and response to soil, groundwater, or surface water impacts associated with environmental releases of regulated wastes or substances.

Presented by GSI Environmental Inc., this popular and informative training series is a must for professionals who need a working understanding of TRRP and those needing to stay up-to-date with the latest TCEQ TRRP guidance and policies.

TRRP Training Course (2 Days): Provides an overview of the TRRP framework and step-by-step training on property assessment and response action procedures established under the TRRP rule

Attendees will become acquainted with rules, key guidance and policies covering affected property assessments, protective concentration levels, and response actions. The course material presents strategies for efficient project management in compliance with TRRP and explains the various report forms adopted by TCEQ.

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Dates and Location

Dates

June 14th and 15th, 2022

Location

Crowne Plaza River Oaks 2712 SW Freeway Houston, Texas 77098 713.523.8448 http://www.crowneplaza.com/

Price and Registration

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Authors: Charles J. Newell, Patrick E. Haas, J. Hughes, T. Khan

Published: May 2000 in Battelle.

Abstract

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Direct hydrogen addition, wherein hydrogen is delivered without the use of fermentation substrates or carbon sources is an in-situ bioremediation technology for chlorinated solvent plumes that is currently under development. A multi-site project to field test the applicability and feasibility of direct hydrogen addition has been initiated by the Technology Transfer Division at the Air Force Center for Environmental Excellence (AFCEE). Results from a pull-push-pull treatability test devised by one of the authors (Haas) conducted at Offutt AFB in Nebraska in Nov. 1998 showed > 99% reduction of the cis-DCE in a 900 L test volume over the 41 hour test period (0.43 to < 0.005 mg/L) and > 99% decrease in the amended hydrogen. Results from the four-month sampling event from a planned 18-month low-volume pulsed biosparging test at Cape Canaveral Air Station Florida also showed apparent biological dechlorination in a 48 x 90 ft test zone located 15-20 ft below the water table in a sandy aquifer. Analysis of the gas tracers after one week indicated extensive biological utilization of hydrogen. At the four month interval, data from 14 sampling points in the test area indicated significant reductions in TCE (e.g., from 48 mg/L to < 0.005 mg/L in one well) and cis-DCE concentrations (e.g., 140 mg/L to 4 mg/L in one well) compared to the 2 points in the nitrogen control area. No excessive methane production was observed in the hydrogen delivery zone.