Low-Volume Hydrogen Biosparging In An Experimental Controlled Release System

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

Early-Bird Price

(Paid by May 1, 2022)
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Standard Price

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Lodging and meals are not
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Authors: Carol E Aziz, Shahla K. Farhat, James M. McDade, Charles J. Newell , David T. Adamson, J. Hughes

Published: May 2003 in GSI volume N/A pages N/A.

Abstract

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In this SERDP-funded study, low-volume pulsed biosparging was examined as a means to effectively deliver hydrogen in situ. Two objectives of the study were to determine the efficacy of hydrogen for PCE reductive dechlorination in a controlled system and the effectiveness of bioaugmentation with a dechlorinating culture from Rice University. The experiments were conducted in an experimental controlled release system (ECRS), a covered sand-filled tank, which was used to simulate a contaminated aquifer. Dissolved PCE was circulated at 1.6 mg/L at a flow rate of 0.4 L/min (0.1 gpm). The tank was inoculated with a dechlorinating culture grown in a suspended growth reactor at Rice University. Hydrogen was typically sparged at 14 standard liters per min (0.45 scfm) for 1 minute as required. Within 10 days of bioaugmentation, significant reductive dechlorination was observed. PCE removal rates ranged from 50 to 100%, with an average of 82%. The amount of PCE removed exceeded the amount of daughter products (i.e., trichloroethylene, cis-1,2-dichloroethylene (cDCE), vinyl chloride (VC), ethene) measured in the effluent. Approximately 2% of the added PCE was present as daughter products in the headspace, indicating that volatilization was not a major loss pathway. Microcosm data indicated that VC may also be degraded via anaerobic oxidation.