The Hénâ waste tip
Giving an industrial site a new lease of life
The Hénâ waste tip project is an ambitious mission that demonstrates ENGIE Electrabel’s desire to epitomise industrial responsibility. The site is home to 1.7 million m³ of ash that has covered two valleys in the Flémalle area since 1952. However, a new green space conducive to the development of biodiversity will soon be created at this former ash deposit.
Short history of the waste tip
The Hénâ waste tip is located in Awirs in the municipality of Flémalle. The site originally consisted of two valleys which were mainly taken up by the Hénâ and Fagnes streams.
The waste tip comprises 1.7 million m³ of fly ash produced by the combustion of coal at the Awirs power plant. Ash was deposited there from 1952 until 1972, when stability issues resulted in the closure of the site.
Over the years, all necessary measures have been taken to guarantee the stability of the waste tip and a continuous monitoring by academics, secured the safety of the site.
In 2002, ENGIE Electrabel began developing a project aiming to completely remove the waste tip. An independent external study showed that this was the only permanent solution for the longer term.
Work on the evacuation of the Hénâ waste tip has been ongoing since the end of 2016.
So far, more than 130,000 tonnes of fly ash have been removed.
In addition, the asbestos removal operation, which was interrupted at the end of April 2017, resumed in mid-November after the permit was extended.
Specific air measurement campaigns are regularly organised (5 times a month), with the results analysed by an independent accredited laboratory.
All results of the air quality surveys, carried out by SGS on the Hénâ waste tip at the boundary of the working area and at the boundary of the waste tip from 5 to 13 February and from 5 to 9 March 2018, meet the set criteria.
In January 2018, we sent our twelfth newsletter to the residents of the Hénâ waste tip.
An ambitious and responsible project
Key figures of the project:
15: The work will take 15 years
60: The number of recommendations implemented, in addition to those strict measures initially proposed to mitigate the impacts on residents
50: 50 million euros investment
1.7: 1.7 million m³ of fly ash
An ambitious project comprising 3 phases
The aim is clear: gradually restore the site to its original state by developing a new, pleasant green space while guaranteeing complete safety in the long term.
Work began in May 2015 and will comprise 3 phases:
- Preparatory phase to assemble the equipment needed to remove the waste tip
- Removal of the ash to the Awirs site using a covered conveyor belt and transportation via boat to the Belgian cement manufacturing sector
- Gradual restoration of the site and dismantling of equipment
Extensive modelling of the project phases has been carried out together with multiple design consultancies to guarantee the stability of the site.
The fly ash will be removed starting with the edges upstream of the waste tip before moving downstream. The removal will adhere to a strict schedule validated by several independent university professors with a view to guaranteeing that the work is safe at all times, especially when reducing the slopes on site.
Internal and external checks of the site’s stability will be tightened up as the work progresses (in cooperation with UCL, ULg and ULB).
Finally, an internal ENGIE Electrabel specific emergency plan and a municipal emergency and intervention plan have been put in place.Press file
Local living conditions
From the moment we began organising this project, we have taken as many steps as possible to mitigate any disruption.
As such, the least disruptive solution was picked over the other, less optimal solutions (e.g. transport via lorry, different route).
The 60 recommendations listed in the environmental impact study or requested by local authorities will be applied with a view to limiting the impact of the project.
In particular, we are taking measures to reduce the noise generated and to ensure that there is no dust found outside the site.Press file
Information for local residents
We strive to provide residents with information in a transparent and proactive manner throughout the project. A dedicated team is standby to listen to them and to provide information.
Freephone: +32 (0)800 20 210
Learn all about the project
- Newsletters prior to 2017 (in French): December 2016, November 2016, September 2016, July 2016, June 2016, May 2016, April 2016, March 2016
- The project in images and 3D October 2016
- Reportages July 2016 (works by par helicopter): RTBF, RTL TVI, Kanaal Z
- Press file May 2016 (in French)
- Reportage RTBF August 2015 (in French)
- The waste tip in images
- Brochure 'Une nouvelle vie pour le site du Hénâ' (in French)
- Presentation April 2010 (in French)