I. Classification and Treatment of Used Cans
Residual Paint Assessment
If the amount of residual paint in the can exceeds 5%, it must be treated as hazardous waste (HW49 category) and disposed of by a qualified hazardous waste disposal unit.
Empty cans with less than 5% residual paint can be cleaned and disposed of as hazardous waste.
Cleaning Methods
Solvent cleaning: Oil-based paints should be soaked in thinner or gasoline, while water-based paints should be cleaned with warm water and detergent.
Mechanical cleaning: High-pressure water jet cleaning or sandblasting (suitable for industrial settings).
II. Compliant Disposal Procedures
Professional Recycling
Industrial cans (such as 200L galvanized drums) must be recycled by the original manufacturer or a hazardous waste treatment unit, undergoing processes such as cleaning, crushing, and incineration.
Small household cans can be handled by contacting the local environmental protection department or hazardous waste recycling station.
Prohibited Actions
It is prohibited to directly compress and sell or arbitrarily discard the cans; recycling without a hazardous waste permit is illegal.
III. Environmentally Friendly Alternatives
Refurbishment and Reuse: After cleaning and reshaping, the cans can be returned to the factory for reuse, reducing resource waste.
Creative Transformation: Waste cans can be repurposed into oil lamps, flower pots, etc. (requires thorough cleaning).
IV. Precautions
Waste cleaning liquid must be treated as hazardous waste; dumping is prohibited.
During storage, protect from wind and rain, and avoid open-air stacking.
