Hazardous Waste Services

Underground Storage

170 metres below ground, we provide an innovative and secure underground storage solution for up to 100,000 tonnes of hazardous waste every year.

The worked out areas of a rock salt mine in Cheshire provide a dry, secure, gas-free storage environment for the permanent disposal of a range of solid and granular hazardous wastes.

The nature of the facility and the unique environment provides the best overall environmental option for a number of specific hazardous waste streams.

To ensure the integrity of the facility strict, site specific testing criteria are used in the pre-acceptance process, including mine condition testing. This simulates how the waste will behave in typical mine conditions and includes biodegradability testing and gas evolution tests.
​Underground storage – wastes we accept
Minosus

Find out if your waste can be stored at our underground storage facility - at Minosus we can accept 42 different categories of waste.

A further 24 potential waste categories are permissible but are subject to Environment Agency improvement orders.

Whilst we are exempt from the need to meet the majority of the leaching limit values imposed by the Waste Acceptance Criteria, we do set our own parameters for waste acceptance.
Can your waste be accepted at our underground storage facility?

You can download a list of accepted wastes in the PDFs below. 
Minosus Brochure
PDF - 1.73 MB
Hazardous waste brochure
PDF - 502.48 KB
How to classify your waste - EWC codes
PDF - 1.43 MB
Potential wastes: Schedule 4b - wastes which may be accepted...
PDF - 18.01 KB
Permissible wastes: Schedule 4a - wastes permitted at Minosus
PDF - 18.65 KB
 

If you have any questions, and to be absolutely certain whether or not we can accept your waste, call us on 01606 550044 or contact us.

​Underground storage – waste handling
Minosus

The Minosus underground storage facility operates to stringent environmental and safety guidelines.

We maintain very strict controls on the types of waste we accept. Sampled and pre-approved wastes arrive at the mine in either drums or flexible intermediate bulk containers (better known as big bags). We verify the contents before loading them into transit capsules for transport underground.
 
Drums and big bags are then offloaded and stacked in their allocated safe storage areas to a maximum height determined by their contents. The location of each waste consignment is recorded for future reference.

Once each disposal zone has been filled, walls (known as stoppings) are erected between the rock salt pillars to create physical barriers between storage zones.

No other waste management facility, save for those in the nuclear industry, has been as deeply researched and assessed as the Minosus facility.

As part of our application for an Environment Agency permit, we undertook extensive research, established detailed design and operational procedures and produced thorough qualitative and quantitative short and long-term risk assessments, all supported by complementary evidence.

Enviros, one of Britain’s leading environmental consultancies carried out a comprehensive study, which modelled a range of scenarios up to 50,000 years into the future.

Thanks to the geological and hydro-geological features that so effectively isolate the underground beds of rock salt from the biosphere, even in the worst case scenario the facility is likely to have “little or no adverse consequence” on the environment.
 
Hazardous waste brochure
PDF - 502.48 KB
Minosus Brochure
PDF - 1.73 MB
How to classify your waste - EWC codes
PDF - 1.43 MB
Potential wastes: Schedule 4b - wastes which may be accepted...
PDF - 18.01 KB