Caustic recycling services
Spent caustic is one of the few high-volume hazardous streams with a genuine second life. Treating it as an automatic disposal cost is common, and on a refinery or petrochemical site it is frequently the wrong call.
Which caustic you have decides whether it has value
Spent caustic is not one material. Sulphidic caustic from treating light hydrocarbon streams, phenolic caustic from gasoline treating, and naphthenic caustic from kerosene and diesel are different in composition and in what can be done with them. Some have established recovery routes into other industries; some are candidates for wet air oxidation or neutralization; some are simply disposal. The determining facts are the sulfide and phenol content and the hydrocarbon carry-over, and they are measurable. The practical point for a generator is that "spent caustic" on a waste profile is not a description — it is a category, and which member of it you have decides whether you are paying to dispose of a waste or supplying a feedstock.
What goes this way
The streams caustic recycling handles, and what each one is under the rules — with acceptance decided by a profile rather than by a name on a drum.
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D002 / D003
Sulphidic spent caustic
From treating light ends. Recovery routes exist where sulfide content is right.
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D002
Phenolic spent caustic
From gasoline treating, with its own recovery and treatment options.
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D002
Naphthenic spent caustic
From kerosene and diesel treating, usually higher in hydrocarbon carry-over.
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D002
Industrial alkaline cleaners
Spent degreasing and cleaning solutions, where metal loading decides the route.
When this is not the right route
The cases where caustic recycling is not what you want, and what to use instead.
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The stream is contaminated past the point where recovery is realistic
Go to Inorganic Acid & Caustic Waste -
It is dilute aqueous waste rather than concentrated caustic
Go to Industrial Wastewater Treatment
What you get back
The records caustic recycling produces, and what each one is evidence of — because the liability for a waste stays with the generator from the moment it is created until it is destroyed.
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Stream characterization
Sulfide, phenol and hydrocarbon content — the numbers that decided whether you were supplying a feedstock or disposing of a waste. Worth keeping, because a change in them is a change in the answer.
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Recovery confirmation
Evidence the material was recovered rather than destroyed, which is a different figure to report internally and a better one.
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Shipping records
Manifest and quantities accepted, per load.
Who sends us this
The facility types that usually need caustic recycling, each with its own page on what that process produces and under which codes.
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- D002
Petrochemical Manufacturing
- Spent caustic
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Refineries
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Chemical Manufacturing
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Metal Manufacturing & Plating
Before you ask for a price
What generators ask about caustic recycling, answered from the rules rather than from marketing copy.
By analysis for sulfide, phenol and hydrocarbon content, which is the same work the profile needs anyway. The unit it came off usually indicates it, and the numbers confirm it.
Not always, and often enough to be worth testing rather than assuming. Contamination is what usually closes the option, which is an argument for keeping streams segregated at source.
Greer runs both, which is the point of asking here. Where recovery works it is the better outcome and the answer is not biased by which service happens to be sold.
Describe the stream. We will tell you the route.
A description of the process and a rough quantity is enough to start. A Certified Hazardous Materials Manager reads every request, and sometimes the answer is a different service than the one you asked about.