Waste Oil Coolant Contamination

When coolant leaks into waste oil it brings far more than water. The feed gains ethylene glycol or a similar compound, corrosion inhibitors, salts and the particles they carry, and each stands to change how the batch must be routed. Waste oil coolant contamination shifts the treatment and handling requirements, it does not make the oil unrecyclable, but it cannot be read from the coolant level alone.

What Coolant Adds to the Feed

Coolant is not pure water. Depending on the formula it contains water, ethylene or propylene glycol, corrosion inhibitors and dissolved salts, together with the metal particles, corrosion products and suspended solids that gather along the way. Water is usually the easiest of these to spot and handle; the glycol and the additive package raise the separation problem by a clear order.

Why Glycol Is Harder Than Water

Free water can often be cleared by controlled heating, settling or dehydration. Glycol, by contrast, behaves differently from both water and hydrocarbon under heat, so an amount that would be straightforward as water becomes a heavier separation task. That distinction is what must grip when the recycling route for a contaminated batch is chosen.

Protecting the Refining Unit

Feed that enters the unit untreated can invite foaming, corrosion, scaling and a falling of heat transfer. When the coolant proportion varies between batches the processing load varies with it, so testing and pre-treatment bring the feed to a more stable condition before the main stage rather than letting the unit absorb the swings.

Testing Before Routing

When the degree and nature of contamination is unclear, the laboratory has to decide. Key readings are water and ethylene glycol content, solids, ash and metals, viscosity and distillation behaviour, together with the recoverable oil ratio. That full picture indicates whether the batch is worth the treatment at all, and then the route is written to match the drain’s actual condition.

Learn More:

• Feasibility Studies for Waste-to-Value Projects
• Turn-Key EPC Delivery
• Plant Design & Engineering
• Facility Efficiency Upgrades
• Resource Recovery Projects

Read the Whole Feed, Not Just the Water

Accurate contaminant reading is the difference between a clean recycle and a fouled unit.

Klean Industries sets the testing and pre-treatment route that keeps coolant-contaminated feed firmly under control.

Considering a coolant contamination project?

Contact Klean Industries about coolant contamination » GO.