Handling and disposal of hazardous waste
From plastic residue and chemical spills to asbestos waste
Introduction
Work does not end when the part is finished. The waste left — remnants, spillage, used protective equipment and degraded material — must be handled correctly. Some of it is hazardous waste and improper disposal can harm both the person cleaning up and the environment afterward.
What makes waste hazardous
A waste is hazardous when it has properties that can harm people or the environment — for example because it is toxic corrosive allergenic or contains fibres that can be inhaled. Uncured epoxy and isocyanate solvent-containing residues and asbestos-containing material belong to hazardous waste. Cured epoxy is less hazardous than uncured but residues that are not fully cured are treated as hazardous waste.
Sorting at source
Waste is best sorted where it arises. Hazardous waste is kept separate from ordinary waste, and different types of hazardous waste are not mixed together, as they can react with each other or be treated differently. Clear sorting at the workplace makes the subsequent disposal both safe and legal.
| Waste type | How it is typically handled |
|---|---|
| Plastic waste (weld/trim) | Sorted by type where possible; clean thermoplastics can often be recycled |
| Uncured epoxy/isocyanate and spill | Hazardous waste — collected, packed tightly and delivered as hazardous waste |
| Used gloves, cloths and suits from chemical work | Contaminated — disposed of according to the safety data sheet instructions |
| Asbestos-containing material and dust | Hazardous waste — moistened, packed tightly, marked and delivered separately |
Packaging and marking
Hazardous waste is packaged so it doesn't spill, leak or release dust and vapours during transport. Asbestos waste is kept damp and packed tightly so fibres don't escape, and the packaging is marked so everyone knows what it contains. The marking is a safeguard for those who handle the waste later — they must be able to see the hazard without opening the package.
Documentation and the prescribed route
Hazardous waste must be handed over to an approved facility and disposal must be documented. The municipality directs where different types of hazardous waste should go, and the company is obliged to follow the instructions. You do not dump hazardous waste in the regular bin, bury it, or burn it — it is illegal and dangerous.
The safety data sheet shows the way
For chemical products the safety data sheet's section on disposal states how residues and contaminated material should be handled. It is read before cleanup begins so you know what is hazardous waste and how it should be packaged and delivered.
Next step: Saneo's guides
Guides on asbestos, PCB, lead and sampling, explained simply and with sources.