Siccum has, on behalf of WSP Sverige AB, carried out a pilot project within the government mission contaminated sediments, RUFS, which several authorities have been given to carry out investigations and mapping in order to produce better guidance for the post-treatment work of contaminated sediments.
The Siccum freeze dewatering module has shown that a high dry matter content (DM content) can be achieved through freeze dewatering of mercury-contaminated fiber sediments. The dewatering technique thus results in a large reduction in the volume of the masses and disposal of the residual by incineration is considered possible.
The freeze dewatering method is considered to have potential for measures in primarily polluted, loose sediments with a low DM content and a relatively high content of organic material. During the pilot trial, the energy consumption was between 43 and 45 kWh / ton of dewatered material, which is considered relatively low based on the achieved DM content.
Furthermore, the pilot test has shown that it is not practical to push the dewatering process too far, as residuals with DM contents > 80% easily dust up and become difficult to handle.
Measurements have shown that particulate mercury is present inside the facility, but with levels below the occupational health and safety agency's hygienic limit values. Furthermore, measurements have shown low levels of mercury in reject water that has undergone filtration.
The method is deemed to be able to be used at full scale.
Read the english report:
Read the original swedish report
