JBETT Insights: How to Handle Waste Gun Wash Solvent and Spent Solvents Generated in Coating & Spraying Operations

JBETT Insights: How to Handle Waste Gun Wash Solvent and Spent Solvents Generated in Coating & Spraying Operations

Waste gun wash solvent, waste solvents and thinners generated during coating and spraying operations are hazardous wastes. They must be managed in compliance with relevant national regulations to prevent environmental pollution and legal liabilities. Below are the handling methods and key notes:

I. Classification and Labelling

1. Waste Classification

• Waste gun wash solvent: Contains paint residues and organic solvents (e.g., acetone, xylene, etc.).
• Waste solvents / thinners: May contain volatile organic compounds (VOCs) such as toluene, ethyl acetate, methanol.

These wastes are generally classified as HW12 (Dye and Coating Wastes) or HW06 (Organic Solvent Wastes) under China’s National Hazardous Waste Catalogue (2021 Edition), with corresponding waste codes (e.g., 900-252-12, 900-404-06).

HW coding is China’s domestic hazardous waste classification system. For EU, US and most other global markets, equivalent classification follows local hazardous waste /spent solvent regulations (e.g., EPA RCRA in the US, Waste Framework Directive 2008/98/EC in the EU).

2. Standard Labelling

• Store in dedicated containers that are leak-proof and corrosion-resistant. Affix hazardous waste labels indicating contents, hazard properties (e.g., flammable, toxic), generation date and other required information.

II. Legal Disposal Options

1. Engage a Licensed Disposal Contractor

• The waste must be handed over to an entity holding a Hazardous Waste Business License (qualified enterprises can be verified via the local ecological and environmental authority).
• Sign a disposal contract and complete the Hazardous Waste Manifest to ensure full traceability throughout the whole process.

2. Common Treatment Technologies

• Distillation for Recycling: Part of the spent solvent can be purified by distillation for reuse (professional equipment is required).
• Incineration: High-calorific-value waste may be sent to a hazardous waste incineration plant for harmless treatment.
• Physicochemical Treatment: Such as neutralization, precipitation, etc., which must comply with environmental protection standards.

Chongqing JBETT Circular: Solvent Recovery Equipment with an Explosion‑proof Integrated Structure Design. Only 5–10% residue remains after recovery, achieving over 90% hazardous waste reduction.

3. Prohibited Activities

• × Discharging directly into sewers, soil or the atmosphere.
• × Unauthorized incineration or mixing with domestic waste for disposal.
• × Collection by unlicensed entities or individuals (likely to cause secondary pollution and legal risks).

III. Waste Reduction and Compliance Management

1. Source Reduction

• Adopt high-efficiency spraying technologies (e.g., electrostatic spraying) to cut the generation of spent solvents.
• Use recyclable eco-friendly cleaning agents (e.g., water-based gun wash solvent).

2. Record-keeping and Declaration

• Establish hazardous waste management records to document the quantities generated, stored and transferred.
• Submit annual declarations of waste type, quantity and destination to the local ecological and environmental authority.

3. Emergency Response Measures

• In case of leakage, immediately contain it with absorbent materials (e.g., sand, activated carbon) to prevent spread.
• Equip storage areas with fire and explosion protection facilities (e.g., anti-static devices, ventilation systems).

IV. Legal Liabilities

• Under local environmental legislation in each jurisdiction, illegal discharge or dumping of hazardous waste may attract substantial fines, ranging from the equivalent of CNY 100,000 to 5,000,000. Severe breaches may lead to criminal liability.

Recommended Steps

• Contact your local environmental authority to obtain a list of licensed hazardous waste disposal service providers.
• Train employees on hazardous waste classification and storage requirements.
• Conduct regular audits of disposal workflows to maintain regulatory compliance.

Professional and compliant handling helps fulfil environmental responsibilities and mitigate legal risks. For region‑specific or industry‑specific regulatory requirements, please consult your local environmental authority for further guidance.