April 10, 2019

Andrew Brey Coauthors Paper on Treating Former Manufactured Gas Plant Residuals by Chemical Oxidants for the Journal of Contaminant Hydrology

Andrew Brey, P.G., (Florida) coauthored a paper entitled "Realistic Expectations for the Treatment of Former Manufactured Gas Plant (FMGP) Residuals by Chemical Oxidants" that was published in the Journal of Contaminant Hydrology on Pages 1-17 in Volume 219 in December 2018.  

His coauthors were Saeid Shafieiyoun, Neil R. Thomson, Chris M. Gasinski, William Pence, and Mike Marley.

Andrew is a Senior Geologist based in Florida with more than 20 years of experience focused on environmental site assessment and remedial investigation. He has directed manufactured gas plant (MGP) and chlorinated solvent assessment activities for various utility and municipal clients throughout the eastern United States. In this capacity, project elements have included technical support on groundwater natural attenuation geochemistry and contaminant source forensic identification. His recent primary project experience includes detailed investigation and feasibility study of MGP sites and their associated surface-soil, subsurface-soil, and dissolved-phase groundwater plumes.

The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide).

Abstract

Methods to remediate soil and groundwater contamination at former manufactured gas plant (FMGP) sites are scarce. The objective of this study was to investigate the ability of two chemical oxidants (persulfate and permanganate) to degrade FMGP residuals in a dynamic system representative of in situ conditions. A series of physical model trials supported by aqueous and slurry batch experiments using impacted sediments collected from a FMGP site were conducted. To explore treatment expectations a screening model constrained by the experimental data was employed. The results from the aqueous experiments showed that dissolved components (except for benzene) were readily degraded by persulfate or permanganate. In the well-mixed slurry systems, when contact with the oxidant was achieved, 95%, 45% and 30% of the initial mass quantified was degraded by permanganate, unactivated persulfate, and alkaline activated persulfate, respectively. In stark contrast, the total mass removed in the physical model trials was negligible for both permanganate and persulfate irrespective of the bleb or lense architecture used. Hence the net benefit of flushing 6 pore volumes of permanganate or persulfate at a concentration of 30 g/L under the physical model operating conditions was minimal. To achieve a substantial degradation of mass within the treatment system (> 40%), results from the screening model indicated that the hydraulic resident time would need to be > 10 days and the average lumped mass transfer coefficient increased by two orders-of-magnitude. Results from long-term (5 years) simulations showed that the dissolved concentrations of organic compounds are reduced temporarily as a result of the presence of per- manganate but then rebound to a profile that is essentially coincident with a no-treatment scenario following exposure to permanganate. Neither a lower velocity nor higher permanganate dosing affected the long-term behavior of the dissolved phase concentrations; however, increasing the mass transfer rate coefficient had an impact. The findings from this investigation indicate that the efficiency of permanganate or persulfate to treat for FMGP residuals is mass transfer limited.

More Information

Learn more about the article: https://www.sciencedirect.com/science/article/pii/S0169772217302516?via%3Dihub
Learn more about the Journal: https://www.journals.elsevier.com/journal-of-contaminant-hydrology
For consultation regarding manufactured gas plant assessment and remediation, contact Andrew Brey at This email address is being protected from spambots. You need JavaScript enabled to view it..
Learn more about Andrew at: https://www.linkedin.com/in/andrew-brey-9ba575120/

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