Europe’s largest bio waste digestion plant

Six new orders for STRABAG in three countries: The recent international success of its patented LARAN plug flow digester has helped the environmental division of STRABAG SE to further expand its good market position in the segment of continuous dry digestion of waste residues. This segment is led by the Dresden-based Plant Engineering Business Unit of STRABAG Umwelttechnik GmbH.

STRABAG was recently hired by Dutch company N.V. HVC (Alkmaar) to expand its bio waste digestion plant in Middenmeer by adding a fourth fermenter. The increased capacity to about 110,000 tons per year will make this Europe’s largest bio waste digestion plant. STRABAG Umwelttechnik had already completed the original dry digestion plant with three digesters that went into operation six years ago.


Growth in France and Italy

In France, STRABAG was awarded two contracts for biogas plants with LARAN plug flow digesters in just a short amount of time. BGB Loiret, operated by ENGIE, awarded STRABAG Umwelttechnik the contract for biogas generation and digestion residue treatment for its biogas plant in Pithiviers. And in Arcis sur Aube, the plant engineering team from Dresden is working on the upstream and downstream peripheral plant technology as well a large LARAN plug flow digester with a reactor volume of 2,500 m3 for the treatment of up to 42,500 tons a year for a project company of local agricultural cooperative SCARA. Together with the two biogas plants already under construction in Pellefigue and Le Neubourg, which are also being realised using dry digestion in LARAN digesters, these new orders help to strengthen STRABAG’s position on the French market.

In Italy, the patented dry digestion technology is also putting STRABAG Umwelttechnik on a growth path. The company is currently handling three orders under a technology partnership with Bozen-based Atzwanger AG, with STRABAG delivering the full range of technology and equipment for the plug flow digesters.


Robust and compact fermenter

The dry digestion process of STRABAG Umwelttechnik, with more than 15 years of proven track record, is based on a horizontal plug flow through a horizontal vessel (LARAN® plug flow digester) with exclusively local mixing of the substrate by way of agitators. The digester is characterised by a compact design and robust construction and can either be cast in situ or made from prefabricated concrete elements. In addition to the treatment of richly structured wastes with high dry matter content, such as organic waste, green waste or household waste, this process is above all suitable for the mono- or co-digestion of richly structured energy crops or agricultural waste products.


STRABAG SE is a European-based technology group for construction services, a leader in innovation and financial strength. Its services span all areas of the construction industry and cover the entire construction value chain.

With approximately 74,040 employees, STRABAG posts an output volume of around EUR 14.04 billion in 2012. From its core markets of Austria and Germany, STRABAG, via its numerous subsidiaries, is present in all countries of Eastern and South-East Europe, in selected markets in Western Europe, on the Arabian Peninsula, as well as in Canada, Chile, China and India. STRABAG generates approximately 80% of its construction output in markets in which it holds one of the top three positions. These include the Czech Republic, Hungary, Slovakia and Poland.

STRABAG has been active on the Romanian market since 1991 and established its office in Bucharest in 1992.

Meanwhile, the group has subsidiaries in all regions of Romania relevant to the market. The company is operating in all construction sectors, especially in Transportation Infrastructures and Building Construction & Civil Engineering segments as well as in environmental construction projects.

In the field of Transportation Infrastructures, especially the rehabilitation of national, regional and local roads is carried out. Due to the experience of STRABAG, motorways, expressways as well as the modernization, expansion and new construction of railway and rail facilities are offered. Furthermore, STRABAG operates successfully in the areas of hydraulic engineering and canal construction as well as redevelopment of supply lines. The construction of outdoor facilities, parking spaces, pavements and sport grounds are also part of the field of activity of STRABAG.

The construction of office, residential and shopping facilities as well as the delivery of concrete foundations for wind farms and maintenance work in refinery plants are counted among the projects of the Building Construction segment.

The activities of Civil Engineering comprise the construction of waste water treatment systems, refuse sorting plants, composting plants and hydroelectric power plants as well as the development and modernization of urban waste water systems.

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