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Sink disposal of laboratory waste: Know the risks and rules
23 January 2024
The UK's sewerage system isn't built for lab waste. Disposing of chemicals down the sink can harm people and damage infrastructure. However, some low-risk waste disposal might be allowed under specific conditions.
Before you consider sink disposal
- Conduct a risk assessment: Ensure it's safe for the specific substance and volume.
- Consult your Departmental Safety Officer: They may advise against sink disposal even for low-risk chemicals.
- Check your building's Trade Effluent Consent: You need this before any disposal. Email Tony Overbury.
- Follow the Consent's limits: These typically cover pH, temperature, specific prohibited substances (e.g. petroleum spirit) and other restrictions.
- Use an approved sink: Your Departmental Safety Officer can confirm which sinks are suitable.
Remember:
- Always prioritise safe and authorised disposal methods for laboratory waste.
- This applies only to low-risk chemicals and specific circumstances.
- Radioactive materials and biological waste have additional requirements.
- Water shortages might limit future sink disposal options.
- Non-compliance could lead to prosecution.
What can you dispose of down the sink
The following limits must be observed
- The pH values must be between 6 and 11.
- The temperature must not exceed 43.3oC.
The following are prohibited to be disposed of down the sink
- Petroleum spirit.
- Calcium carbide.
- Thiourea and thiourea derivatives.
- Non-biodegradable detergents.
Where can I get further information
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