Bioremediation of rock cavern in Stockholm Royal Seaport

Nordic BioEngineering AB is part of project that clean up a rock cavern of 90 000 cubic meters polluted water in Stockholm Royal Seaport. This is the first time a bioremediation method using Archaea in Sweden and the results has been very successful since the remediation started in the early spring 2017.

The remediation uses both mechanically and biologically methods. Responsible for the remediation is Fortum Värme and Stockholm Parking.

The mechanical part of the purification simply consists of pumping water from the mountain, cleaning it in a bubble chamber, and then releasing the return water to the mountain room. New water is pumped up, purified, and then the process continues until the water is relatively clean.

To get the rock cavern and the mountain totally remediated, a biological treatment is necessary as a final remediation step. The bioremediation is done with the help of our microbial products containing Archaea. The microbes break down the hydrocarbons in several stages and the remains is harmless substances such as water, carbon dioxide and biomass.

The bioremediation stage consists of a sedimentation container that is fitted with air nozzles to oxygenate the water. Archaea and nutrients is added depending on the level of contaminant. Contaminated water is purified with a flow of 3000 liters per hour in each container. The efficiency of cleaning is 100%, results from analysis of the water is below the detection limit for naphtha (that is below 10 µg/l). The purified water is returned to the rock caverns. In this way, this biodegradation can continue in the mountain until the remaining oxygen and nutrients are consumed by the Archaea.

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