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Pilot-testing an air sparge system for arsenic removal

A long-term cleanup of the former Vineland Chemical Company has undergone additional work over the last two years to address a re-contaminated watershed area. Since the early 1990s, the U.S. Environmental Protection Agency (EPA) has worked to remove arsenic-contaminated groundwater, soil, and sediment from the south-central New Jersey site. But in 2016, areas in the Blackwater Branch floodplain, a stream that flows through the site, were discovered to have been re-contaminated.

The U.S. EPA looked to OBG to add a new treatment technology at the site that would address the recently discovered contamination. The project included soil, surface water, and groundwater sampling; hydraulic testing; and groundwater flux evaluation to better delineate the lateral and vertical extent of portions of an arsenic plume in groundwater at the site. The hydrogeologic investigation was used to refine the boundaries of arsenic impacts, identify points of pore water seepage to the Blackwater Branch, and evaluate the mass flux of arsenic to the stream and its assimilative capacity.

OBG designed and installed a new pilot treatment technology at the site to reduce groundwater contamination by using an air sparging system—which works by injecting oxygen into the ground, causing a reaction with the arsenic and making it immobile and insoluble. The system was pilot-tested in 2016 in one portion of the plume; pilot-testing was expanded to an adjacent area in 2017 and is ongoing.

OBG’s Nick DiMarcello recenlty discussed this project and the air sparging treatment technology at a luncheon event hosted by the Nevada Society of Professional Engineers—Southern Nevada Chapter and the ASCE Nevada Section, Southern Nevada Branch.

Environmental Engineering Groundwater Remediation. Pilot-testing an Air Sparge System for Arsenic Removal: Vineland Chemical Superfund Site, Vineland, NJ

About Nick DiMarcello, CQM: Nick has 18 years of experience managing engineering and construction projects from conceptualization and design to implementation and completion. Nick can be contacted at: Nick.DiMarcello@obg.com