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Fuel spill treated using RegenOx at a Swedish military base in Afghanistan
RegenOx® has been successfully used as an emergency response cleanup reagent by the Swedish Army to remediate a minor fuel spill in Afghanistan.Read More
PlumeStop® and ORC Advanced® Treat BTEX to Non-Detect in 1 Month
Project Highlights
- Benzene (BTEX) and TPH-d (diesel) were reduced to non-detect within one month with no rebound
- Pre-project verification testing provided hydrogeological data to optimize the successful application of PlumeStop and ORC Advanced
- Active site did not impede remediation efforts
Project Summary
An active gas station in the Pacific Northwest was impacted with BTEX concentrations from a petroleum release. Following remediation of the source, residual BTEX concentrations persisted in a down gradient well. A new combined remedies in situ program using PlumeStop and ORC Advanced was designed. Following the verification testing, REGENESIS co-applied PlumeStop and ORC Advanced into the residual BTEX plume. After one month, sampling was conducted showing contaminants had been dramatically reduced to non-detect levels.
Remediation Approach
REGENESIS worked closely with the project consultant to complete a multi-step verification process prior to remediation. This procedure included a clear water injection to test aquifer properties and soil borings for detailed characterization of the proposed treatment area. This was followed by a pilot injection of PlumeStop to test distribution. The verification testing found that despite soils at the site being classified as clays and silts, there was a sufficient amount of sand present to allow for good distribution. Injection pressures remained below 5 psi for PlumeStop and below 10 psi for ORC Advanced. Distribution of greater than 12 feet was also observed. The verification process was an integral part of the project, helping to more accurately characterize true hydrogeologic conditions. Technical Engineers were able to take the information obtained from the verification process and optimize the PlumeStop and ORC Advanced design. The co-application of the two technologies quickly sorbed dissolved-phase contaminants and promoted aerobic biodegradation.
REGENESIS Solution Applied
PlumeStop Liquid Activated Carbon™ is composed of very fine particles of activated carbon (1-2μm) suspended in water through the use of unique organic polymer dispersion chemistry. Once in the subsurface, the material behaves as a colloidal biomatrix binding to the aquifer matrix, rapidly removing contaminants from groundwater, and enhancing permanent contaminant biodegradation. ORC Advanced is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled release of molecular oxygen for periods of up to 12 months upon hydration.
Results
Residual BTEX and TPH-d concentrations lingering for years are common for gas station sites and often are the only obstacle to closure. The combined remedies application of PlumeStop and ORC Advanced demonstrates a unique ability to attain non-detect levels in a short time frame with substantial cost savings over other approaches, including natural attenuation.
Manufacturing Site Gets Closure using In Situ Desorption with Vacuum Enhanced Recovery for Petroleum Hydrocarbons
Project Highlights
- VOC levels show a 99% decrease in soil and 66% decrease in groundwater contamination
- Unique desorption reagent and enhanced recovery process approved for use by Michigan DEQ
- Site closure granted for two petroleum releases within same general area
Project Summary
Two separate UST petroleum releases were identified within the same general area of the manufacturing site with one being more recent and the other an older historic release. Following soil hydro-excavation activities which were limited by a building footprint, residual VOC contamination was identified at concentrations of 770,820 μg/kg in soil and 12,387 μg/L in groundwater. In Situ remediation using PetroCleanze® , an enhanced desorption/ extraction technology was planned for use to treat the remaining high levels of VOCs. Petro- Cleanze is optimized to desorb bound hydrocarbon mass and drive it from the soil matrix into the aqueous phase. Once pollutants are moved into the dissolved phase, its ability to chemically oxidize portions of the contamination coupled with enhanced recovery (physical extraction) effectively reduces contaminant concentrations.
Remediation Approach
A total of four initial PetroCleanze injection/extraction events took place in two treatment areas close to where the UST was once located. Each injection used a total of 1,320 lbs. of PetroCleanze and 925 lbs. of RegenOx Part A; the material was applied as a 5% solution (2000 gallons) through eight direct-push injection points. The vertical treatment interval ranged between 5 feet to 15 feet below ground surface. Following each injection, a vacuum enhanced recovery event was performed approximately two weeks later. The two week period was critical as it allowed PetroCleanze time to react and free up the bound hydrocarbon mass. Approximately 2,000 gallons of petroleum impacted water was removed during each extraction event and disposed of at a licensed disposal facility. Correlating soil samples in key treatment areas indicated that concentrations were reduced up to 99% with the exception of one area which required an additional injection event. Based on the site conditions, subsurface obstructions limited the influence of the PetroCleanze to this area. Therefore, a fifth injection event was conducted immediately surrounding the residual area in which the soil contamination remained to directly address the soil contamination. Correlating soil samples following the additional injection event indicated the concentrations were reduced up to 90%. Six months after treatment, groundwater VOC levels in EW-2 were reduced from 12,000 μg/L to 4000 μg/L marking a 66% reduction in the treatment zone. Within the same well, following each injection/extraction event, TPH data reported concentrations consistently decreasing from 20,000 μg/L to 10,000 μg/L to 5,900 μg/L. In 2014, as a result of the significant reductions in both soil and groundwater contamination, Michigan DEQ approved restricted UST closure for the two petroleum releases with no further action required.
Technology Description
PetroCleanze is a customized formulation of the widely used RegenOx in situ chemical oxidation technology. The primary function of PetroCleanze is to increase the desorption rates of hydrocarbons bound in saturated soil and make them available for more efficient and rapid treatment using a range of enhanced recovery technologies.
ISCO Treats High Levels of TCE with Planned Enhanced Bio for TPH Treatment
157,000 lbs. of PersulfOx® Applied to Treat Illinois Manufacturing Facility
Project Highlights
- Remediation mandated after oil sheen observed in river adjacent to manufacturing facility
- In Situ chemical oxidation (ISCO) paired with excavation to remediate site
- Tight treatment deadline met through supply of 51 PersulfOx SuperSacks, containing 2,204 lbs. each, which were delivered within a few days’ notice
- TPH soil plume has been reduced by >90% (from 6,111 cubic yards to 555 cubic yards)
Project Summary
An operating metal fabrication facility, located in Illinois, caused subsurface impacts from the use of cutting oils and degreasing solvents. This resulted in high levels of TPH and TCE in soil and groundwater. The state of Illinois cited the facility for a violation when an oil sheen was observed seeping from the property into an adjacent river. A mechanical oil recovery system was installed and absorbent booms were used to stop oil from reaching the river. ISCO was selected as the remediation approach to treat the contamination below the active facility. The TCE area was treated with PersulfOx via injection wells and a soil mixing application with an excavator.
Remediation Approach
Prior to the start of remediation activities, a change in the primary consultant was made and a new consultant was brought in. The new consultant imposed a tight deadline of several months to complete the full scope of remediation activities. REGENESIS was able to assist with keeping the project on-deadline through the timely delivery of 51 PersulfOx SuperSacks, containing 2,204 lbs. each. The PersulfOx SuperSacks were delivered within a few days’ notice. The consultant installed a series of injection wells within and outside of the building. PersulfOx was injected into these wells during three applications over a three-month period. Additionally, the TCE area was treated with PersulfOx® through a soil mixing application using an excavator. The final step of the remediation plan is to treat the TPH-impacted soils outside the building through excavation and the application of Oxygen Release Compound (ORC®) Advanced Pellets which will supply a long-term oxygen source of oxygen for enhanced bioremediation of the residual TPH. The client is also evaluating the use of PlumeStop to change the FOC value of the soil for a site specific Tier 3 closure level via MNA for an area that had extremely high TPH values >40,000ppm.
Technology Description
PersulfOx is a sodium persulfate-based chemical oxidation technology which destroys both hydrocarbon and chlorinated solvent type contaminants in the subsurface. PersulfOx contains a built-in catalyst which activates the persulfate component and generates contaminant-destroying free radicals without the need for the addition of a separate activator.
ORC Advanced Pellets are a pelletized version of REGENESIS’ widely used ORC Advanced and are designed specifically for direct application into excavations, tank pits and trenches. This pelletized, dry application material minimizes airborne dust while eliminating the need for specialized equipment and spray water required for powder-slurry applications.
AZ Superfund Site Uses ISCO to Replace Recirculation Wells Leading to Cost Savings of $100,000
Project Highlights
- 95% reduction of BTEX, MTBE and TMBs reported on-site
- Total savings estimated to be $100,000
- In Situ Chemical Oxidation (ISCO) combined remedy design incorporates PersulfOx® to effectively address reduction in contaminants
Project Summary
A former industrial paint facility in Tempe, Arizona was contaminated with high levels of gasoline in the groundwater. Ongoing active remediation using Accelerated Remediation Technology (ART) was applied to treat high levels of BTEX, MTBE and TMB. However, this remediation approach was unsuccessful in reducing contaminants to cleanup target levels due to the limited radius of influence produced by the recirculation well system. REGENESIS was approached to design an ISCO plan using the existing treatment well infrastructure.
Remediation Approach
REGENESIS injected 10,028 pounds of PersulfOx at a 12% solution in two applications. As a result, a 95% reduction of BTEX, MTBE, and TMBs was reported post-application. The overall PersulfOx ISCO injection treatment totaled $40,000 – a small fraction of the previously deployed ART system cost and equal to four months of the ART system’s operational expense.
REGENESIS Solutions Applied
PersulfOx is a sodium persulfate-based chemical oxidation technology which destroys both hydrocarbon and chlorinated solvent-type contaminants in the subsurface. PersulfOx contains a built-in catalyst which activates the persulfate component and generates contaminant-destroying free radicals without the need for the addition of a separate activator.
Results
The REGENESIS ISCO plan using PersulfOx contributed to the 95% reduction in BTEX, MTBE, and TMBs while providing significant cost savings to the client in the remediation of this Arizona Superfund site. Use of a combined remedy approach offers clients viable options for achieving cleanup target levels and compressed time to closure.
Safe and Simple Excavation Application Provides Long-Term Treatment
Summary
During the demolition and redevelopment of a former petrol filling station, an underground storage tank was removed. The tank had been used for the storage of diesel and had leaked into the surrounding soils and groundwater. The impacted soils were excavated and removed to a waste management facility. The groundwater within the excavation was impacted with dissolved phase hydrocarbons and required further treatment.
Regenesis provided the remediation contractor with a remedial design for the application of ORC Advanced Pellets to treat the residual contamination within the groundwater in and around the open excavation.
Treatment
ORC Advanced Pellets were applied into the groundwater, in the base of the excavation. This was completed by placing them in an excavator bucket and spreading evenly across the area. By using the pelletised version of ORC Advanced, there was no need for mixing or application using pumps and the potential for dust creation was minimised.
The pellets take only minutes to apply and yet provide a controlled release of oxygen into the groundwater for a period of 9-12 months from a single application. The ORC Advanced stimulates the growth of an aerobic biomass which accelerates the biological degradation of dissolved phase hydrocarbon contamination.
What’s Special?
- The use of ORC Advanced Pellets meant that the contractor could backfill the excavation and continue the build programme with minimal disruption.
- The remediation then continued in situ with no need for physical plant taking up valuable space or requiring maintenance.
- ORC Advanced Pellets provide an effective long-term treatment of residual dissolved phase contamination though a very easy, safe and rapid application process.
Product Description
ORC Advanced Pellets (ORC-A Pellets) are a pelletised version of REGENESIS’ widely-used ORC Advanced and are designed specifically for direct application into excavations, tank pits and trenches. This pelletised, dry application material minimises airborne dust while eliminating the need for specialised equipment and spray water required for powder-slurry applications. ORC Advanced Pellets are approximately 3-10 mm in size.
High TPH Concentrations Treated Using PersulfOx® and ORC® Advanced
Future Site of Stormwater Retention Ponds Remediated with ISCO, Enhanced Aerobic Biodegradation
Project Highlights
- Initial treatment with aerobic bioremediation effectively removed 60% of site contamination.
- PersulfOx® and ORC® Advanced were used to treat two remaining hot spot areas.
- Site closure is pending additional groundwater monitoring.
- Contamination concentrations must be reduced to meet stringent groundwater quality standards.
Project Summary
This site is a former commercial facility in the Southeast with high TRPH contaminant impacts to soils and groundwater. The property is currently vacant and the state department of transportation plans to create a stormwater retention pond on site. However, contaminant concentrations in groundwater need to be reduced to meet stringent groundwater quality standards before any construction can begin.
The plume was first treated via enhanced aerobic bioremediation with ORC Advanced, which effectively removed over 60% of the dissolved-phase contamination within 18 months. In two hot spot areas, residual contamination in the smear zone continued to cause impacts to groundwater. A follow-up treatment combining in situ chemical oxidation and enhacned aerobic bioremediation was employed. PersulfOx and ORC Advanced were used to bring this site towards closure by effectively treating these two hot spot areas. Initial sampling results 30 days after treatment showed attainment of groundwater quality standards.
Remediation Approach
ORC Advanced was injected over 60 direct-push locations across two plume areas. A year and a half post-application, two remaining hot spot areas with residual capillary fringe contamination had caused continued issues. PersulfOx and ORC Advanced were used to bring this site towards closure by effectively treating these two hot spot areas.
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 up to 12 months upon hydration.
PersulfOx is a sodium persulfate-based chemical oxidation technology which destroys both hydrocarbon and chlorinated solvent-type contaminants in the subsurface. PersulfOx contains a built-in catalyst which activates the persulfate component and generates contaminant-destroying free radicals without the need for the addition of a separate activator.
RegenOx® Excavation Application Treats Groundwater Contamination
80% TPH Concentration Reduction at California DoD Facility
Project Highlights
- Source removal and RegenOx® ISCO application reduce contamination levels to clean-up standards
- Horizontal piping network installed as contingency plan for additional remediation
- 80% reduction in groundwater concentrations observed
Project Summary
The project site is a former Department of Defense (DoD) fuel dispenser facility in Northern California where past corrective measures included AST/UST removal, soils excavation and groundwater monitoring. Sample results indicated continued elevated concentration levels of TPH-G, TPH-D and TPH-mo within a defined area near the former USTs. The treatment approach included additional excavation and in situ chemical oxidation (ISCO) application via RegenOx mixed into saturated zone. Quarterly sampling indicated an 80% reduction in groundwater concentration levels post treatment; which met the corrective action cleanup levels for TPH.
Remediation Approach
The selected contractor excavated, managed and disposed of impacted soils to depths of nine feet over the two defined treatment areas. RegenOx Part A (oxidizer) and Part B (silica gel activator solution) were placed in the saturated zone and mixed in with the excavator bucket to 3 feet below the excavation bottom. Prior to backfill and compaction, a horizontal piping network was installed to serve as a contingency plan in the event that any additional in situ and/or bioremediation remediation was required. Regenesis assisted the client with the horizontal piping network design which was incorporated into the bid specifications. This site area has been submitted for closure and with continued quarterly monitoring.
Technology Description
RegenOx is an advanced chemical oxidation technology that destroys contaminants through powerful, yet controlled chemical reactions and not through biological means. This product maximizes in situ performance while using a solid alkaline oxidant that employs a sodium percarbonate complex with a multi-part catalytic formula.
Acetone and Petroleum Hydrocarbons Treated at Active Industrial Facility
Combined ISCO/Bioremediation Treatment Approach Reduces Contamination Levels
Project Highlights
- Acetone concentrations pre-remedation were as high as 54,000 μg/L
- Site access agreement required that existing site operations could not be interrupted for construction
- Site water was not allowed to be used therefore all water had to be trucked in and a separate water permit to access city water from fire hydrants was required
Project Summary
A former industrial facility in northern California operated as a gas manufacturing plant from the early 1900s until it was decommissioned in 2001 and sold. The property is currently leased by a bottled water distribution facility.
At this facility, acetone was used extensively in acetylene manufacturing. The acetone was stored on-site in underground storage tanks (UST) but no evidence of leaking acetone USTs was found.
However, high concentrations of acetone – a pre-remediation maximum of 54,000 micrograms per liter (μg/L) were found in one area of the site. Other dissolved chemicals of concern (COC) include gasoline and gasoline-range petroleum hydrocarbons from former USTs such as benzene, toluene, ethylbenzene and xylenes (BTEX).
The extent of contamination in the early 1990s extended to large portions of the site. A pump and treat system was used on-site in 2005, however contamination persisted. Contamination approximately 12 feet below ground surface was detected within the soil. A remediation plan using both ORC® Advanced and RegenOx® was used to treat the remaining contamination.
The site access agreement for this project required that existing site operations could not be interrupted for construction. In order to minimize disturbance to tenants and work within these constraints, all drilling field work was performed on weekends. Site water was not allowed to be used therefore all water had to be trucked in and a separate water permit to access city water from fire hydrants was required. In addition, multiple drill rigs and support vehicles operated within a small area, increasing logistical and safety concerns.
Remediation Approach
A mixture of 6,500 pounds of RegenOx and 3,000 pounds of ORC Advanced was injected at 45 locations using multiple direct-push drill rigs. The injection points were designed in a grid pattern with a nominal 15-foot spacing between injection points, but more densely placed in the area of highest contaminant concentration. Benzene concentrations in groundwater have stabilized at about 10 μg/L and acetone concentrations have stabilized at about 1,600 μg/L. Post-treatment monitoring results show that all the COCs in the treatment area have consistently remained below health-based cleanup levels since the treatment was applied.
Technology Description
Advanced Formula Oxygen Release Compound (ORC Advanced®) is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled-release of molecular oxygen for periods of up to 12 months upon hydration.
RegenOx is an advanced chemical oxidation technology that destroys contaminants through powerful, yet controlled chemical reactions and not through biological means. This product maximizes in situ performance while using a solid alkaline oxidant that employs a sodium percarbonate complex with a multi-part catalytic formula.
Open Excavation Treatment at Former NJ Service Station
RegenOx® and ORC® Advanced Pellets Remediate Petroleum Hydrocarbon Contamination
Project Highlights
- Former service station contaminated with BTEX levels measuring 11 ppm in groundwater and soil impacts removed through excavation
- Combined remedy to treat the open excavation with both in situ chemical oxidation and enhanced aerobic bioremediation technologies
- RegenOx and ORC Advanced Pellets technologies are compatible/non-corrosive with underground infrastructure and utilities infrastructure in the subsurface
Project Summary
A former service station in New Jersey was contaminated with high levels of BTEX (measuring 11 ppm in groundwater pre-treatment). Due to significant amounts of contaminated soil mass remaining at the former service station, an excavation was proposed by the environmental consultant. RegenOx and ORC Advanced Pellets were applied to the open excavation to chemically oxidize remaining saturated impacts and to promote enhanced aerobic biodegradation of petroleum hydrocarbons in the dissolved phase. Both of these technologies utilize alkaline chemistry (pH > 8), which is non-corrosive to nearby public utilities and the underground infrastructure at the service station.
Remediation Approach
RegenOx and ORC Advanced were co-applied into an open excavation at the former service station site. The excavation extended approximately four feet into the saturated zone. Because the excavation was limited by physical constraints, RegenOx, a chemical oxidant, was applied to the base of the excavation to oxidize and desorb residual petroleum mass from the soil. ORC Advanced Pellets were co-applied to provide a slow release of oxygen (up to 12 months longevity) that promotes enhanced aerobic biodegradation of petroleum hydrocarbons. In total, 2,000 pounds of RegenOx and 882 pounds of ORC Advanced Pellets were co-applied to the 2,600 square foot excavation area.
Technology Description
The advanced formulation of the Oxygen Release Compound (ORC Advanced) is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled-release of molecular oxygen for periods of up to 12 months upon hydration. The pelletized form of ORC Advanced were designed to improve safety and handling for excavation applications.
RegenOx is an advanced chemical oxidation technology that destroys contaminants through powerful, yet controlled direct oxidation and free-radical reactions. This product maximizes in situ performance through the use of a solid alkaline oxidant (a sodium percarbonate complex) and a multi-part catalyst. These oxidation reactions do not inhibit natural bacterial populations and are compatible with biological treatment methods.
