PROJECT PROFILE
Sequential Anaerobic and Aerobic Treatment of Chlorinated Solvents to MCLs
ORC Advanced Releases Oxygen for up to 15 Months in Treatment Zone
Project Highlights
• All target compounds reduced to below 5 ug/L in onsite wells.
• Anaerobic biodegradation using Hydrogen Release Compound
(HRC®) treats PCE and 1,1 DCE to below federal MCLs.
• Aerobic biodegradation using Advanced Oxygen Release
Compound (ORC Advanced®) treats vinyl chloride (VC) below
MCLs.
• ORC Advanced provided oxygen for a period of 15 months in
the target treatment zone.
Project Summary
Anaerobic and aerobic treatment was conducted on
the site to reduce PCE, DCE and VC concentrations.
The site is located in the South Carolina Coastal Plain and is a former light industrial facility.
Baseline concentrations of total chlorinated VOCs – which included tetrachloroethene
(PCE) and daughter products plus 1,1-dichloroethene (DCE) – were as high as 2,000 ug/L
in the near-source groundwater. The treatment involved sequential anaerobic and aerobic
treatment using HRC® and ORC® Advanced.
Remediation Approach
Site Type: Manufacturing
Contaminant of Concern: PCE,
DCE, VC
Concentration: 2,000 ug/L
Remediation Approach:
Enhanced Anaerobic
Bioremediation,
Enhanced Aerobic
Biodegradation
The initial groundwater treatment was conducted in November 2003 when 2,400 pounds of
HRC was injected at the site using direct push technology. VOC concentrations in the target
monitoring wells decreased to below federal MCLs within 4-5 years except for vinyl chloride
Soil Type: Silty Sand
(VC), which appeared to have stabilized between 10-15 ug/L, and 1,1-DCE, which appeared
to have stabilized between 7-30 ug/L. In an attempt to attain MCLs and regulatory closure, Treatment Area: 2,500 Square
the treatment approach shifted to aerobic bioremediation to accelerate degradation of Feet
residual VC and 1,1-DCE. It has been documented that aerobic biodegradation of daughter Technology Used: HRC, ORC
Advanced
products such as VC can be much faster than anaerobic processes.
The aerobic treatment involved injection of 1,360 pounds of ORC Advanced via direct push
technology into 22 temporary points. Subsequent groundwater montitoring has shown reductions in VC to below MCL
except for periodic detections between 2-3 ug/L and reductions in 1,1-DCE to below the MCL of 7 ug/L onsite. The VOC
concentrations as well as dissolved oxygen levels have demonstrated that ORC Advanced released oxygen for 15 months in
the target treatment zone.
Technology Description
ORC Advanced is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled-release of
molecular oxygen for periods of 12-18 months upon hydration.
HRC is a controlled release, electron donor material, that when hydrated is specifically designed to produce a controlled
release of lactic acid. The newly available lactic acid is critical for the production of hydrogen to fuel anaerobic biodegradation
processes in soil and groundwater.
Regenesis Remediation Technologies • www.regenesis.com • 949.366.8000