Articles & Case Studies

Recovery and environmentally sustainable management of the Danube river

Posted: Wednesday 3rd November 2010

As part of the “Living Danube” project in Hungary an advanced waste water treatment plant - one of the largest and most advanced in its kind – is now protected by a very special green roof which exploits the high-performance properties of DuPont™ Typar® geosynthetic to deliver long term reliable functionality.

“Living Danube“ is an EU co-funded project with a budget of approximately 500 million Euros aimed at assisting the recovery and environmentally sustainable management of the Danube river. An increase in the amount of treated waste water from the agglomeration of Budapest discharged into the Danube of up to 95% is one of the project’s key goals, and accordingly the waste water treatment plant in the northern part of Csepel island has been refurbished and updated.

Emphasis has been laid on environment-friendly and sustainable building and construction for the “Living Danube“ project. Therefore, the large flat roof (around 10.000 square metres) of the plant building has been designed as a green vegetation surface. Green roofs absorb air-borne dust and similar impurities, drown out noise and retain up to 90% of water, preventing rainwater from draining into the sewerage.

Futhermore, roof vegetation consumes carbon dioxide and releases oxygen while green roofs also provide protection to roof structures and insulation layers against temperature fluctuations and UV radiation, thus significantly improving their lifetime. The Csepel plant roof is designed as a green flat inversion roof (Fig. 1) and over 78,000 square metres of DuPont™ Typar® SF geosynthetic was specified.

Two layers of DuPont™ Typar® have been laid for filtration and separation functions. DuPont™ Typar® acts as a water permeable filtration layer between the soil and hydro accumulation layers, preventing water from penetrating into lower layers. Thanks to its unique structure, DuPont™ Typar® does not clog with fine soil particles and provides a long-lasting and optimum filtration performance. DuPont™ Typar® also acts as a separating layer between the extruded polystyrene and hydro accumulation layers. Unlike standard geotextiles, DuPont™ Typar® geosynthetic does not soak up water and thus cannot freeze, eliminating a number of technical problems.

DuPont™ Typar® is a spunbonded non-woven fabric made of continuous 100% polypropylene filaments. It has high tensile properties and excellent water permeability and is one of the most well-known and broadly used high-quality materials for road building, drainage systems and inversion roofing. DuPont™ Typar® geosynthetics are pre-compressed and thus thinner and lighter than common needlepunched geotextile materials: this minimises storing requirements and facilitates handling. Moreover, DuPont™ Typar® is easy to cut – you can use a knife or scissors for small pieces or even a chainsaw for cutting foil rolls.

Mr.Bellavics László, a founder of Hungarian Greenroofbuilder Association, who designed the Csepel green roof comments: “We have been working with DuPont™ Typar® for over 10 years and our long-term experience shows that the main benefit of DuPont™ Typar® is its unique, thermally bonded nonwoven structure which brings an exceptional mechanical strength and durability to a green roof where DuPont™ Typar® is installed."

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