More strongly contaminated, pneumatically transportable wastes are deposited in dome-shaped mining caverns. They are conditioned to slurry consistency and are pumped into the mining caverns. Suitable waste types are:

• filter dusts and solid flue gas treatment residues from waste incineration plants or
• incinerated clearing sludges.

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Underground-reutilisation facility Unterbreizbach

Reutilisation process

• Initially, all wastes are pneumatically transshipped in stationary silos, and are then transported to below-ground silos by a pneumatic conveyor.
• At the backfill paste production plant a patented process is used to create a suspension, called high-consistency slurry, by mixing the wastes with brine.
• After hydraulic transport to the caverns the high-consistency slurry hardens without emitting liquids.

Delivery and packing

• in bulk, in silo truck

Certificates

• Qualified waste management facility (Efb) 
• QM-system in accordance with DIN EN ISO 9001

Beginning of operation: 1992

Annual capacity: 130,000 tons