Pollution causes
Wastewater discharged by the industrial plants of Nitrokémia and other companies operating in the area until the 1980s significantly polluted the riverbed of Séd-Nádor channel with toxic metals over a length of 125 km. These riverbed pollutants, especially mercury, pose a very high environmental risk, because their presence has been detected not only in riverbed sediments, but also in the body tissues of aquatic organisms.
The remediation project
The project goal is to remove any polluted sediments produced during former industrial activities, especially those contaminated with mercury, from the Sárvíz-Nádor channel bed. During the first and second project phases, it was necessary to remove and dispose of about 300,000 m3 polluted sediments from a 30 km long riverbed. In the third and current project phase, the task is to drag, treat and dispose of 218,000 m3 polluted sediments from a 51 km long riverbed. Each remediation phase is closed by riverbed reconstruction.
Special project features
Before project start, an intensive clearance of explosive remnants (unexploded ordnance, UXO) was necessary.
The project involved earthwork and building work operations, which also affected residential areas and required close cooperation between the contractor and local residents.
An important project task was the preservation and restocking of fish fauna and the implementation of fish hideouts.
Main project data
Remediation of Séd-Nádor channel and liquidation of channel bed pollution caused by the wastewater discharged from industrial sites: 30,800 linear metres; 483,300 tons.
Improvement of water quality and ecological potential, implementation of new living spaces.
Rehabilitation of Séd-Nádor channel bed, embankment wall strengthening, long-term securing of riverbed hydraulic parameters: 29,500 linear metres.
Time period: from 2009 to 2014
Financing: Hungarian State support: 100%
Client: Nitrokémia Környezetvédelmi Zrt.
Total project value: approx. €38.4 million
Pollution causes
Wastewater discharged by the industrial plants of Nitrokémia and other companies operating in the area until the 1980s significantly polluted the riverbed of Séd-Nádor channel with toxic metals over a length of 125 km. These riverbed pollutants, especially mercury, pose a very high environmental risk, because their presence has been detected not only in riverbed sediments, but also in the body tissues of aquatic organisms.
The remediation project
The project goal is to remove any polluted sediments produced during former industrial activities, especially those contaminated with mercury, from the Sárvíz-Nádor channel bed. During the first and second project phases, it was necessary to remove and dispose of about 300,000 m3 polluted sediments from a 30 km long riverbed. In the third and current project phase, the task is to drag, treat and dispose of 218,000 m3 polluted sediments from a 51 km long riverbed. Each remediation phase is closed by riverbed reconstruction.
Special project features
Before project start, an intensive clearance of explosive remnants (unexploded ordnance, UXO) was necessary.
The project involved earthwork and building work operations, which also affected residential areas and required close cooperation between the contractor and local residents.
An important project task was the preservation and restocking of fish fauna and the implementation of fish hideouts.
Main project data
Remediation of Séd-Nádor channel and liquidation of channel bed pollution caused by the wastewater discharged from industrial sites: 30,800 linear metres; 483,300 tons.
Improvement of water quality and ecological potential, implementation of new living spaces.
Rehabilitation of Séd-Nádor channel bed, embankment wall strengthening, long-term securing of riverbed hydraulic parameters: 29,500 linear metres.
Time period: from 2009 to 2014
Financing: Hungarian State support: 100%
Client: Nitrokémia Környezetvédelmi Zrt.
Total project value: approx. €38.4 million
