Waste Treatment and Valorisation

Excavation and removal of tar and tar polluted soil, Carcoke Zeebrugge (Belgium)

3,300 ton tar were excavated and processed. ...

3,300 ton tar were excavated and processed. During the execution of these works, strict health and safety procedures were followed to protect staff and the environment.

Key figures
Country

Belgium

Client's name

Ovam

Contractor's role

Main Contractor (Part JDN: 100%)

Period

02.2007 - 11.2008

Scope

Excavation and removal of tar and tar polluted soil. The remediation of the former Carcoke factory in Zeebrugge is a project that, because of its size, has been split up in several sub-projects. Envisan was awarded different sub-projects on this site, including this project. After a detailed soil study, two tar dump areas were localized.
The extremely toxic tar residues were subject to tests and subsequently excavated. During the execution of these works, strict health and safety procedures were followed. The removed tar has been conveyed to a thermal treatment plant.

Excavation depth

2.5 m

Volume

3,306 tonnes of tar (thermal treatment)

Remediation and rehabilitation works at the former gypsum landfill site in Evergem/Zelzate - Terranova (Belgium)

Key figures
Country

Belgium

Client's name

Brownfield development by the NV Terranova

Contractor's role

JV Partner (Part JDN: 50%)

Period

07.2010 - 12.2033

Technical specs
Scope

Since 2010 Jan De Nul Group (through its affiliates Envisan NV and Jan De Nul NV) is joint owner of the gypsum deposit of the former Rhodia-Nilefos factory sites in the port of Ghent, Belgium. Both companies are each 25 % shareholder of the Terranova NV, the company which redevelops the landfill. The site is heavily polluted with a range of inorganic contaminants and waste. Years of pumping and leaching of acid transport water has resulted in a serious volume of hazardous acid waste and groundwater. The gigantic site with a total surface of 85 ha is transformed and rehabilitated into a landfill and a solar energy park using the brownfield approach.

Methodology

Site Remediation and rehabilitation of gypsum deposit (28,000,000 tonnes of waste):
- Excavation and transport of 600,000 m³ of waste and contaminated soils
- Installation of groundwater management system (hydraulic barrier) and ground water treatment plant
- Treatment of 800,000 m³ of acid waste water
- Capping of the site with 658,000 m² of bentonite clay liner, drainage layer and soil
- Acceptance and placement of 2,800,000 tonnes soil and dewatered sediments for the final cover and intermediate layers
- Installation of a photo voltaic solar park (15MW) on capped areas

Volume

600,000 m³ of contaminated soil and waste
800,000 m³ of acid ground water
Capping of 70 hectares

Type of contaminants

Heavy metals, organic compounds, gypsum waste, acid waste water

Covering of the landfill and construction of a centre for sediments, Imog Site, Moen (Belgium)

The owner was looking for diversification options for the completely filled landfill. To this purpose, the inter-municipal waste handling cooperative concluded a contract with the joint venture...

The owner was looking for diversification options for the completely filled landfill. To this purpose, the inter-municipal waste handling cooperative concluded a contract with the joint venture Jan De Nul - Envisan.
The landfill was covered and a treatment centre (lagoons) for subaqueous soil was built.

 

Key figures
Country

Belgium

Client's name

IMOG

Contractor's role

Main Contractor

Period

01.09.2011 - 01.01.2013

Technical specs
Scope

Covering of the present landfill in combination with the organization of the treatment centre (lagoons) for subsaqueous soil

Sediment treatment

Laying of foil, application of hydrostab and KSP-glass

Volume

For the covering of the landfill following materials have been used:
- 21,680 tonnes KSP glass as drainage layer
- 37,620 tonnes Hydrostab as sealing layer
- 62,350 tonnes sediments dewatered in lagoon fields (building material) and soils (Architectural land use)
- Application of 40,000 tonnes of soil and dredged spoil for the construction of the lagoon banks

Use secondary raw materials

- KSP-glass as gas drainage layer
- Hydrostab as replacement of the standard used clay mats

Landfill Rehabilitation, Zagreb (Croatia)

Rehabilitation of the existing 80 ha wide domestic waste dumpsite Jacuševic, near the city of Zagreb, Croatia; construction and operation of a new sanitary landfill facility on the same site....

Rehabilitation of the existing 80 ha wide domestic waste dumpsite Jacuševic, near the city of Zagreb, Croatia; construction and operation of a new sanitary landfill facility on the same site.
Works included the installation of multiple bottom liners and an upper sealing according to the most stringent European directives.
 
Installation of a gas management system, including the construction of extraction wells with associated piping network.
Installation of two gas turbines for the production of electricity.

 

Key figures
Country

Croatia

Client's name

Z.G.O.S. d.o.o.

Contractor's role

Management Contractor

Period

10.2000 - 08.2004

Technical specs
Volume

Remediation techniques:
Excavation and reallocation of waste: 7 million m³
Acceptation of new waste: 1.1 million m³
Supply and installation of HDPE liner 2.5 mm: 350,000 m²
Supply and installation geotextiles: 1.5 million m²
Supply and installation of horizontal groundwater drainage: 1,000 m
Supply and installation of leachate drainage and collectors: 1,000 m
Supply and installation of reinforcement geotextiles: 15,000 m²
Clay liner: 231,500 m³
Installation of degassing wells and capping system.

Sediment treatment and landfill development, Sfax (Tunisia)

The Taparura project included both environmental dredging, selective excavation, sediment treatment and landfill development. The project was part of a more comprehensive package of measures taken...

The Taparura project included both environmental dredging, selective excavation, sediment treatment and landfill development. The project was part of a more comprehensive package of measures taken by the government for the general improvement of the environment. Thanks to the remediation of the polluted coastline of the Tunisian city of Sfax, the coastal area redeveloped itself into a brand new part of the city.

 

Key figures
Country

Tunisia

Client's name

SEACNVS: Société d’Etudes et d’Aménagement des Côtes Nord de la Ville de Sfax

Contractor's role

Joint Venture Partner (Part JDN-ENV: 70.7%)

Period

26.10.2006 - 21.05.2009

Technical specs
Equipment

TSHD Alexander von Humboldt and James Cook, Pontoons DN24 and DN25, Multicats Tabriki and DN49, Land equipment for civil works

Scope

Remediation & Rehabilitation Works: The Taparura project is one of a series of broader measures taken by the Tunisian authorities to improve the overall environment in Sfax
Dredging Works in the Kerkannah Channel
Beach Regeneration Works by Reclamation.

Soil

Soils to be excavated: sand, sediments, phosphogypsum
Soils to be dredged and reclaimed: sand

Volume

Dredging Works in the Kerkannah Channel: 6,716,000 m³
Excavation and storage of polluted soils: 2,300,000 m³
Environmental dredging: 700,000 m³
Reclamation: 6,716,000 m³
HDPE-membrane: 35,700 m²
Mineral barrier: 35,700 m², with a 60 cm thickness

Dredging depth

10 - 15 m

Coastal protection

Geotextile: 29,897 m²
Rubble: 1,558 tonnes
Rock Revetment: 61,082 tonnes
Civil works: drainage canals, sewers
Isolation of the phosphogypsum depot by construction of cement bentonite wall & a HDPE-membrane

Design, construction and exploitation processing plant, Arpechim, Pitesti (Romania)

Envisan remediated three large lagoons with oil sludge for Rumanian oil refinery Petrom. Envisan designed and constructed a state-of-the-art treatment plant that allowed to incinerate the polluted...

Envisan remediated three large lagoons with oil sludge for Rumanian oil refinery Petrom. Envisan designed and constructed a state-of-the-art treatment plant that allowed to incinerate the polluted sludge without using external fuel and with the generated energy being recovered. The plant included, among others, a pre-treatment area, thermal treatment, a turbine for converting steam into electricity, a waste water treatment plant and storage space. For the entire project, 180,000 m³ of oil sludge was treated but as Envisan also runs the plant, more waste can still be treated in future.

 

Key figures
Country

Romania

Client's name

SC Petrom SA (OMV Group)

Contractor's role

Main Contractor for remediation works
Owner and operator of proecessing plant

Periode

Contract 1: 19.03.2008 - 31.07.2012
Contract 2: 01.08.2012 - 25.09.2013

Technical specs
Volume

Contract 1:
- Oil sludge: 131,084.20 m³
- Waste water: 13,184.94 m³
Contract 2:
- Contaminated sludge, soil and water: 76,000 m³
- Backfilled soil: 400,000 m³

Type of contaminants

Mineral oil

Remediation of Carcoke site, Brussels (Belgium)

Carcoke is the name of a cokes factory that was operational in Zeebrugge. During that period English coal was converted into cokes for the steel industry. In 1975, this factory merged with the...

Carcoke is the name of a cokes factory that was operational in Zeebrugge. During that period English coal was converted into cokes for the steel industry. In 1975, this factory merged with the cokes factory of Marly in Brussels, which was in operation until January 1993. After the closing of both factories heavily polluted sites were left behind. It was a real challenge to remediate the dilapidated and polluted factory sites of 14 ha and 12 ha respectively and to transform them into clean, valuable sites. Envisan assisted for both sites in their complete remediation. On both sites, hundreds of thousands of m³ of polluted soil were excavated and treated. The heavily polluted groundwater is pumped up using various pumping systems and treated in complex, aboveground treatment plants.

 

Key figures
Country

Belgium

Client's name

Port of Brussels

Contractor's role

JV Partner (Part JDN: 66%)

Period

28.08.2007 - 08.2011 (Demolition works and Soil Remediation)
07.2011 - 07.2026 (Groundwater remediation)
02.05.2053 (concession)

Technical specs
Scope

Remediation of the Carcoke site (12 ha) - Design and Build
Excavation and treatment of 110,000 m³ contaminated soil (specific loading system into ships with long reach system over a public road in use)
Specific measurements (continuous PID measuring stations and biomonitoring)
Pilot Test Chemical Oxidation
In-situ remediation by means of multiphased extraction (134 filters) and groundwater extraction wells
Installation of biosparging-system
Treatment of groundwater and soil vapour during the next 15 years (10 m³/h: oil/water separator, automatic sand filtration, stripping tower, activated carbon filtration for water and air, ion exchange filtration, metal adsorption filtration)
Design and Build of a multifunctional logistic center
Exploitation of the logistic center
Modernizing existing quay
Diversion of existing road between project area and canal
Main infrastructure works on site
Sieving of soil and debris

Methodology

Demolition work
Excavation
Thermal treatment
Groundwater remediation (pump & treat, bioventing, chemical oxidation)

Volume

110,000 m³

Type of contaminants

PAH's, TPH, Tar, mineral oil, BTEX, heavy metals