Two brownfield developments, Bekaert Zwevegem and Bekaert Hemiksem, carried out in partnership with private developers Vanhaerents and Vooruitzicht, were remediated in early 2016. These sites were previously used for the manufacture of steel wiring. In Zwevegem, a whole new quarter of the town is being created including housing, a sports hall and a park. DEC took over the full responsibility for the remediation project on a lump sum basis.
DEC and its joint venture partner acquired an 8 ha, brownfield site from Bayer in Ghent. The work was finished by the end of 2016. Now totally cleaned up, this site will be used for industrial purposes.
DEC was awarded by the Flemish utility company Eandis for another brownfield site in the centre of Kortrijk, which had previously been used for gas production. This will be remediated and then sold on to a project developer. Work is ongoing and due to complete in July 2017.
Meanwhile, works at the Nilefos brownfield site in the port of Ghent got underway in early 2016 with the remediation of the former gas works and the dismantling of the radioactive contaminated structures. Once completed, a new chemical cluster, Dockland, will be established on the site.
The old industrial site will be transformed into a new quarter of the city with 1,500 homes, businesses and recreational areas.
This highlights the advantages of bringing in DEC as early as possible, as the City of Ghent originally opened the tendering process for the project in 2013. It was keen that any solution chosen should not just focus on the lowest bid. Above all, it needed to be a sustainable solution.
DEC worked with the project developers very early on and this led to a tailored, integrated approach, which included both the remediation work and the site development. New Docks will be fully compliant with all the latest environmental regulations and it is designed to be entirely electricity neutral, using effluent as the main heating source. With a view to sustainability, all the transport will be carried out by ships and during the excavation process for the remediation works, the foundations will already be put in place for the new houses. This is a two-year project.
Indaver treats industrial hazardous waste in three rotary kiln incinerators. To ensure compliance with stringent emission requirements, the flue gases from the incineration process are treated in a so-calledwet gas scrubber, whereby harmful substancesare captured by the washing water. This washing water must also meet rigorous discharge standards. To this end, it will be treated separately in the new treatment installation. Indaver’s existing water treatment installation had reached the end of its useful life.
Construction of the plant is due to be completed by August 2017. After a 6-month test period, the new plant will be commissioned in early 2018.
Purazur focuses on the high-tech treatment of industrial and domestic waste water, percolate water from landfills and contaminated groundwater.
Construction was also finished at two ponds dedicated to the storage of wastewater coming from an industrial company specialised in refining sugar.
Ecoterres dredged 60,000 m³ of polluted sediments from Wallonian waterways. For these two projects, 50,000 m³ of non-polluted sediments and 60,000 m³ of polluted sediments were dredged by the company’s backhoe dredger ‘Sclessin’, and by the bucket dredger ‘Belgica’. All the sediments were transported by Ecoterres’ own barges and discharged into the treatment centres with floating units developed in-house, using high density pumping installation. All in and out survey controls were also provided by Ecoterres with its modern measuring and surveying equipment, the vessel ‘Zig Zag’.
Ecoterres continued to operate the public sediment recycling centre at Tubize (site of Vraimont). In total 110,000 tonnes of nonpolluted sediments were dewatered and recycled as fill for industrial terrains.
The contaminated waste is treated and then the soil is reused in a project to create nature reservations in the Den Helder area, such as the Vogeleiland and Wierholt project. Both of these are examples of creating new nature with techniques such as immobilisation, where former waste flows are reused in a sustainable way.
DEC has to ensure that every part of the operation meets the strict health and safety requirements imposed by ExxonMobil and the Norwegian Environment Agency. The company managed to get all the stringent safety and environmental permits in place and work began in May 2016. The remediation is expected to be successfully finished this summer, even though DEC has the work permits until mid-2019.
DEC expects to treat around 45,000 tonnes of acid tar and more than 250,000 tonnes of contaminated soil. One reason this project is particularly challenging is because the excavated acid tar has to be turned into a good quality, usable secondary fuel and this is being achieved. The fuel will be used by cement kilns as an alternative to coal or other primary fuels. Ultimately, the Esso Norge site has to be restored to meet the Norwegian Environment Agency’s standards for a future mix of commercial and residential use.
In a 4-year maintenance contract awarded in 2014, Ecoterres continued to handle polluted sediments dredged by SDI in the port of Dunkirk. Additionally, Ecoterres won a project called “Condé-Pommeroeul” in northern France. This project entails the construction of three deposit sites designed for the storage of 1.4 million m³ of polluted sediments and dredged materials. The project should be completed in 2020.