Why Used Oil Pickups Get Rejected: What Contamination Changes
Why would a used oil pickup be rejected?
A used oil pickup may be rejected when unexpected materials, such as solvents, chemicals, antifreeze, water or other waste streams, are mixed with the oil or when there is not enough information to verify what the container contains. The appropriate next step depends on why the material was rejected and whether additional waste characterization is needed.
A used-oil pickup is supposed to be one of the more routine parts of facility maintenance.
Oil is collected. A service provider arrives. The material is removed and sent for recycling or appropriate management.
Until the provider says:
“We can’t take this.”
For an automotive operation, manufacturer, maintenance facility or other business generating used oil, a rejected pickup can quickly become more than a scheduling inconvenience. The facility still has material onsite, storage capacity may be limited, operations continue generating more oil, and someone now has to determine why the material was rejected and what happens next.
Often, the issue isn’t the used oil itself.
It’s what may have been mixed with it.
Used Oil Is Supposed to Be Contaminated
This distinction is important.
Under EPA’s definition, used oil is petroleum-based or synthetic oil that has been used and, as a result of that use, has become contaminated by physical or chemical impurities. That can include lubricating oils, hydraulic fluids and other oils used for similar purposes. US EPA
So seeing dirt, metal particles or other evidence of normal use does not automatically mean something has gone wrong.
The more important question is:
Did something enter the used-oil stream that wasn’t supposed to be there?
That is where a routine recycling stream can become more complicated.
One Container Can Change the Entire Load
Used-oil collection points are convenient.
That can also make them vulnerable to becoming catch-all containers.
Someone finishes servicing equipment and pours used lubricating oil into the tank.
Another employee has a small amount of solvent left after cleaning a part and adds it to the same container.
Someone else adds antifreeze, brake cleaner, fuel, contaminated rinse water or another liquid because the tank is already designated for “waste.”
Those decisions may seem insignificant individually.
Together, they can fundamentally change the waste stream.
EPA notes that businesses may become subject to hazardous-waste requirements when used oil is mixed with hazardous waste. The regulatory outcome depends on what was mixed with the oil and the circumstances surrounding the mixture. US EPA
In other words:
Used oil plus another waste does not necessarily equal used oil.
And that is one reason a service provider may need more information before accepting a load.
Why Would a Used-Oil Provider Reject a Pickup?
There isn’t one universal reason.
Acceptance criteria can vary depending on the transporter, recycler, processing facility and intended destination.
But when a provider questions a load, the underlying concern is often whether the material still meets the criteria for the waste stream they expected to receive.
A provider may encounter unexpected characteristics, receive information indicating that another material was added, or require additional characterization before accepting the oil.
That can lead to testing, additional documentation, a different management method or an entirely different disposal outlet.
The operational lesson is straightforward:
Keeping a used-oil stream clean is considerably easier than figuring out an unknown mixture after the fact.
Solvents Deserve Particular Attention
Solvents and used oil can create an especially important compliance issue.
EPA uses what is known as the rebuttable presumption for used oil containing more than 1,000 parts per million of total halogens. At that level, the oil is presumed to have been mixed with regulated halogenated hazardous waste unless the presumption can be successfully rebutted through analysis or other documentation. There are specific exceptions and circumstances that affect how this rule applies. US EPA
For a facility manager, the practical takeaway isn’t that every used-oil tank needs to become a chemistry lesson.
It’s that employees should understand why “it’s only a little solvent” is not a good reason to put something into a used-oil container.
Preventing the mixture is much simpler than explaining it later.
Contamination Can Spread Beyond One Tank
There is another reason used-oil recyclers and transporters care about what is in a load.
A contaminated stream can potentially affect other material.
EPA has specifically identified PCB contamination of used oil as a recurring problem for regulators, collection centers and recyclers. When used oil containing PCBs at regulated concentrations is introduced into otherwise recyclable oil, the larger volume can become subject to additional disposal requirements. Tanks and trucks that held the contaminated oil may also require appropriate decontamination. US EPA
That illustrates why a transporter cannot always simply load questionable material and “figure it out later.”
The receiving company has its own environmental responsibilities.
Prevention Starts Where the Oil Is Generated
The easiest used-oil problem to solve is the one that never enters the tank.
Facilities can reduce uncertainty by looking at how used oil moves through the operation before it reaches the main collection point.
That includes asking:
- Are used-oil containers clearly identified?
- Do employees know what belongs in them?
- Are solvents, antifreeze and other waste streams collected separately?
- Are funnels, transfer containers and pumps dedicated appropriately?
- Could rainwater or other liquids enter outdoor containers?
- Does maintenance know what to do when it encounters an unfamiliar fluid?
- Is there a process for reporting an accidental mixture?
- Can the facility identify where the oil in a collection tank originated?
These aren’t simply housekeeping questions.
They help protect the integrity of the waste stream.
What Should You Do If a Used-Oil Pickup Is Rejected?
The first instinct may be to find another company willing to take the material.
That shouldn’t necessarily be the first step.
A rejection is information.
Something caused the transporter or receiving facility to question whether the material fits the expected waste stream.
Start there.
Find out why the load was rejected.
Was testing performed? Was an unexpected constituent identified? Did someone report that another material may have entered the tank? Did the receiving facility change its acceptance criteria?
Then determine what information is needed to properly characterize and manage the material.
Depending on the circumstances, that could involve reviewing process knowledge, examining the materials that may have entered the tank, obtaining analytical testing or working with an environmental services provider to identify an appropriate management option.
Most importantly, avoid solving an uncertain waste-characterization problem by simply moving it to another vendor.
Then Find Out How It Happened
Getting the material offsite addresses the immediate problem.
It doesn’t necessarily prevent another rejected pickup.
Once the waste stream has been appropriately characterized and managed, trace the problem back through the operation.
Perhaps an employee misunderstood a label.
Maybe maintenance had nowhere else to put a particular fluid.
Perhaps a temporary container wasn’t identified properly.
Maybe several waste streams are generated in the same work area and the collection system makes cross-contamination easy.
Or perhaps the material wasn’t contaminated at all, but the facility lacked the documentation needed to demonstrate what was actually in the tank.
That last possibility is particularly important.
A reliable environmental program should not depend entirely on someone saying:
“I’m pretty sure nothing else went in there.”
Protect the Waste Stream Before You Need the Pickup
Used-oil recycling works best when everyone involved understands what the stream is supposed to contain.
For generators, that means looking beyond the day the truck arrives.
Clear collection practices, employee awareness, separation of incompatible or differently regulated materials, good records and communication between operations and EHS can all help reduce surprises when it is time for removal.
And when something unusual does happen, identifying the material before arranging transportation can help determine the appropriate next step.
Because the goal isn’t simply to find someone willing to haul away what’s in the tank.
It’s to know what is in the tank, how it should be managed and where it can appropriately go.
FRS Environmental provides used-oil removal, hazardous-waste management and environmental services for industrial and commercial facilities. If your facility has a routine used-oil stream or an unexpected waste-management challenge, contact FRS Environmental to discuss the appropriate next steps.