OIL AND GAS / SOIL
Hydrocarbon-Contaminated Soil Remediation by Spraying, Not Digging
Hydrocarbon-contaminated soil remediation breaks down petroleum hydrocarbons, diesel, crude oil or produced fluids, left in the ground so a spill site can close without digging the soil up and hauling it away. Native soil bacteria already know how to break hydrocarbons apart, but the oil itself blocks air from reaching them and the ground beneath it turns oxygen-starved fast. We spray the hydrocarbon cleanup formulation of DRP Accelerator, an inorganic compound that carries usable oxygen, over the affected area, and on hydrocarbon work that formulation carries a bacteria package alongside it, the one application in our program where organisms are added. Moisture carries the accelerator down into the soil, and repeat applications keep oxygen available while the bacteria work through the contamination where it sits. For surface staining a plain pump-up sprayer is enough: we dilute the formulation to a 5 to 10 percent solution in fresh water and spray it on until it soaks into the soil, repeating every seven to ten days, with no digging and no turning of the soil. For contamination that sits deeper, we inject the same diluted solution to the depth of the pollution, or open a trench, fill it with the solution and let it soak in, on the same repeat schedule. Timelines run from weeks for surface stains to three to eight months for heavier contamination, set by the level and type of contamination, the toxicity of the pollutant, soil pH and temperature, and how porous the soil is. We work alongside your environmental consultant and the regulating agency rather than in place of them: sampling and site closure sign-off stay theirs.
The bacteria that eat oil are already in the soil. They are short of oxygen.
- Native bacteria capable of breaking down petroleum hydrocarbons are already present in most soil types.
- Oil coating soil particles blocks oxygen from reaching the ground beneath it, creating anaerobic conditions where bacterial breakdown stalls.
- DRP Accelerator is an inorganic compound that carries usable oxygen to bacteria already living in soil.
- The hydrocarbon cleanup formulation of DRP Accelerator adds a bacteria package alongside the oxygen carrier, the one application in the program where organisms are added.
- Groundwater contamination is typically addressed with a separate remedy, such as a pump-and-treat system, rather than a soil-surface application.
What happens in contaminated soil
Soil under a diesel spill, a produced-fluids release or an old fuel stain is not sterile. Native bacteria live in nearly every soil type, and many of them can break hydrocarbon chains apart into simpler compounds they can use for energy. Left alone, though, that process stalls almost as soon as it starts. Oil coats soil particles and shuts out air, the oxygen already in the pore spaces gets used up fast, and without a way to replace it the ground under the spill goes anaerobic, the same oxygen-starved state a sewer line or a lagoon bottom reaches when there is no dissolved oxygen left. The bacteria that could clear the site are still there. They are short of oxygen, not short of appetite. That gap is where a program built to resupply oxygen goes to work, and it is why a spill can sit unchanged for years even though the organisms capable of breaking it down were in the ground the whole time.
How the program runs
We spray the hydrocarbon cleanup formulation of DRP Accelerator, an inorganic compound, over the affected area rather than mixing it into the soil by hand or machine. We add no chemical additives. Everywhere else in our program we add no bacteria; on hydrocarbon work the formulation carries a bacteria package alongside the oxygen carrier, the one application where organisms are part of the treatment, working with the accelerator to help break hydrocarbon chains apart once oxygen is available. For surface staining, a plain pump-up sprayer is enough: we dilute the formulation to a 5 to 10 percent solution in fresh water and spray it on, using enough liquid to soak into the soil, and repeat every seven to ten days. For contamination that sits deeper, we dilute the same solution and inject it to the depth of the pollution, or open a trench, fill it with the solution and let it soak into the polluted area, on the same repeat schedule. Moisture in the ground, rain, irrigation or the site's own dampness, carries the accelerator down into the soil profile rather than leaving it sitting on top. Timelines run from weeks for surface stains to three to eight months for heavier contamination, set by the level and type of contamination, the toxicity of the pollutant, soil pH and temperature, and how porous the soil is. Surface staining needs no digging and no turning at all; even where a trench carries the solution to depth, the surrounding ground stays where it is while the bacteria already living in it do the work.
What a lab test showed about oil on pipe walls and equipment
A lab observation gives a sense of how this works on surfaces beyond open soil. A glass cylinder was coated with heavy pit oil and left to dry for two days, leaving a solid, dried layer of oil on the inside wall. The cylinder was then filled with water carrying the hydrocarbon cleanup formulation and left standing at room temperature for two more days, with no stirring, brushing or other agitation. By the end, most of the oil had lifted off the glass wall, and the oil that came loose collected as a layer floating on top of the water rather than staying stuck to the surface. The same observation points to practical applications for surfaces like this when the treatment is engineered for the site: disposal wells, oil-coated equipment, standing contaminated water, sludge on the bottom of tanks, and formation surfaces. This is a lab observation, not a field case, and we treat it that way: a sense of what the hydrocarbon cleanup formulation does to oil bound to a hard surface, not a promise for any particular piece of equipment.
What kinds of sites and spills
We have applied this program to diesel spills, crude oil releases and produced-fluids contamination around wellheads, pump skids, storage tanks, pipelines and transfer points, the places where a fitting fails, a tank overflows or a line is damaged during routine work. Some of these sites are ordinary dry ground where excavation would be possible but expensive and disruptive to production. Others are not: wet ground, coastal soil, marsh edges and low areas that stay saturated most of the year are places where an excavator cannot get traction, a dig plan raises its own environmental questions, and hauling contaminated soil off site multiplies both the cost and the paperwork. Spraying a program on the surface and letting moisture carry it down works on both kinds of ground, but it is the wet and coastal sites, the ones where digging was never a real option, where the difference between spraying and excavating matters most. A research institute's study of an oil-damaged mangrove gulf on Venezuela's Caribbean coast is a case in point: five weekly applications and a month of rest brought the hydrocarbon content of the subsoil down by most of its starting level, measured by lab samples taken before and after, in ground too wet and dense for excavation. We cover that study in our case studies.
What we need to plan it
Before we plan an application we need to know the size of the affected area and its boundaries, what was spilled, diesel, crude or produced fluids, and roughly how much reached the ground. Soil type and moisture matter as much as the spill itself: a sandy, well-drained site behaves differently from a clay-heavy or seasonally wet one, and moisture is what carries the accelerator down to where the bacteria are working. If sampling has already been done, lab results for the contaminants of concern tell us where the contamination sits and how deep it runs, and we build the application plan around that data rather than guessing. Finally we need to know what the regulating agency is asking for: a closure standard, a sampling schedule, a reporting deadline. The program is built to fit inside whatever plan is already in motion, not to replace it.
Working with your environmental consultant and the state agency
On most hydrocarbon sites there is already an environmental consultant managing the file and a state or federal agency that has to sign off before the site closes. We are one part of that plan, not the whole of it. The consultant sets the sampling schedule, interprets the lab results against the applicable standard, and reports progress to the agency; we supply the application, the schedule for repeat treatments, and our own observations from the field. We are glad to work directly with a consultant on timing an application around a sampling event, or to explain what the accelerator and the bacteria package are doing to a regulator who asks. What we do not do is sign off on closure or set the standard the soil has to meet. That decision, and the sampling that supports it, belongs to the consultant and the agency the site already answers to, and our job is to make their numbers move in the right direction.
What it does not do
This program treats soil, not groundwater. If a spill has reached the water table, groundwater usually needs its own remedy, commonly a pump-and-treat system, and spraying the soil surface does not substitute for that. It also is not the first step where free product, oil that can still be physically recovered, is sitting on the ground or floating on shallow water. Free product should be skimmed, vacuumed or otherwise recovered first, because bacteria work on hydrocarbons that are dissolved or bound in soil, not on a pooled layer of oil. And it is not instant. The accelerator and the bacteria package give bacteria that are already capable of breaking hydrocarbons down the oxygen and organisms they need to keep working, and a site still needs time for that biology to run its course. Knowing what a spraying program is not for is part of planning it well.
COMMON QUESTIONS
Straight answers.
What is hydrocarbon-contaminated soil remediation?+
Hydrocarbon-contaminated soil remediation is the process of breaking down diesel, crude oil or other petroleum hydrocarbons left in the ground, in place, without digging the soil up and hauling it away. We spray the hydrocarbon cleanup formulation of DRP Accelerator over the affected area so the bacteria already living in the soil, working alongside the bacteria package the formulation adds, have the oxygen and organisms they need to keep working. Moisture carries the treatment down into the soil profile, and repeat applications keep it going until the site is ready to close.
Can bacteria really break down oil and diesel in soil?+
Bacteria capable of breaking down petroleum hydrocarbons are already present in most soil, which is why in-place bioremediation works at all. The problem is not the bacteria, it is oxygen: oil blocks air from reaching the soil beneath it, and the bacteria stall without a supply of usable oxygen. Resupplying that oxygen is what lets the same bacteria finish the work they were already capable of doing.
Why is a bacteria package added on oil and gas sites when other WWI programs add none?+
A bacteria package is added alongside DRP Accelerator specifically in the hydrocarbon cleanup formulation, used on hydrocarbon soil applications, the one program where organisms are part of the treatment. It works together with the accelerator to help break hydrocarbon chains apart once oxygen is available. No other application in our program adds bacteria; hydrocarbon soil work is the exception.
How long does a hydrocarbon soil remediation program take?+
Timelines run from weeks for surface stains to three to eight months for heavier contamination, though the pace depends on the level and type of contamination, the toxicity of the pollutant, and soil pH, temperature and porosity. Surface staining is applied with a plain pump-up sprayer and repeated every seven to ten days; deeper contamination is injected to depth or soaked in through a filled trench on the same schedule. There is no excavation involved, so the schedule follows the biology rather than the pace of digging and hauling.
What kinds of oil and gas sites is this used on?+
This program applies to diesel spills, crude oil releases and produced-fluids contamination around wellheads, pump skids, storage tanks, pipelines and transfer points. It works on ordinary dry ground and on wet or coastal ground where excavation is difficult or impossible. Spraying the surface and letting moisture carry the treatment down works the same way regardless of terrain.
Does this replace the environmental consultant or the state agency's role?+
Hydrocarbon soil remediation with DRP Accelerator does not replace the environmental consultant or the state agency's role on a site. It is one part of a closure plan that a consultant and a regulating agency oversee: sampling, interpreting results against a closure standard, and signing off on the site stay with them. We supply the application, the treatment schedule and field observations, and work alongside that existing plan rather than in place of it.