STRABAG Umwelttechnik GmbH - STRABAG’s dry digestion technology meets with strong demand across Europe

Six new orders 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 t 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 t 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.

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