Judgment Criteria
1. Residue Content: If the residual waste paint, waste mineral oil, or other hazardous waste in the paint can exceeds 3% of the container's volume, it is classified as hazardous waste (HW49 category) and must be managed accordingly.
If the residual amount is less than 3%, and after professional cleaning, it meets the original use requirements of the "General Rules for Identification Standards of Solid Waste," it may not be managed as hazardous waste.
2. Hazardous Characteristics: Even if the residual amount is small, if the residue possesses hazardous characteristics such as toxicity (T), corrosivity (C), or flammability (I), it must still be treated as hazardous waste. For example, nitrocellulose lacquer thinner cans must be disposed of as hazardous waste due to their flammability.
Treatment Procedures
1. Cleaning and Drying: The can must be air-dried or cleaned using professional equipment to ensure no liquid residue remains. Organic solvents (such as banana oil) are prohibited during the cleaning process to avoid secondary contamination.
2. Storage Requirements: Unwashed waste paint buckets should be stored in a dedicated hazardous waste storage room that is leak-proof and rainproof, and a hazardous waste label should be affixed.
3. Disposal Procedure: Disposal must be entrusted to a unit holding a hazardous waste management license. Mixing with ordinary garbage or indiscriminate disposal is strictly prohibited.
