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WEBINAR: Novel In-Situ Remediation Of Hydrocarbons & Arsenic Using Nitrate/Sulfate

May 11 @ 12:30 pm - 1:30 pm PDT


Pump and treat has been implemented over the last 25 years at the Baird & McGuire Superfund Site in Holbrook, Massachusetts, to treat a persistent plume comprised primarily of naphthalene, 2-methyl naphthalene, and arsenic. The goal of this project is to develop and evaluate alternative sustainable in-situ technologies to treat the plume.

The pump and treat system was shut down to evaluate plume behavior under native flow conditions followed by continual sulfate injection into the source area to stimulate the anaerobic biodegradation of hydrocarbons in groundwater and soil (Parsons NAPL-Away® process) while simultaneously generating iron sulfide minerals to sequester arsenic. A parallel nitrate injection pilot test evaluated a ferric iron mineral permeable reactive barrier for passive in-situ arsenic treatment.

Results/Lessons Learned
Sulfate pilot test results indicate: (1) a nearly contiguous zone of sulfate 500 feet through the plume, (2) significant reductions in naphthalene and 2-methyl naphthalene, and (3) more rapid reductions in arsenic where microbial sulfate reduction was stimulated at greater rates. Due to these successful results, the pilot test will be continued to further evaluate this promising technology. Results from the nitrate injection pilot test indicate iron oxidation and decreased arsenic concentrations (up to 60X) near the injection wells. Arsenic concentrations rebounded shortly after discontinuing nitrate injection.

About The Presenters:
Julien Chambert – Julien is a geologist with more than 15 years of experience, specializing in site characterization and remediation projects. He holds a Bachelor of Science in Geological Engineering and a Master of Science in Geology.

JOIN HERE: Click here to join the meeting
Or call in (audio only) +1 951-465-7634
Phone Conference ID: 552 060 387#

Please visit the Parsons YouTube channel where video recordings of our previous technical webinars are available for viewing.


May 11
12:30 pm - 1:30 pm PDT
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