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Product: Scrubber Sector: Water treatment
32 scrubbers for the world's largest solar-thermal sewage sludge drying plant
LARGEST WATER TREATMENT PLANT IN GERMANY
The water treatment plant in Bottrop is one of the largest in Germany, treating wastewater for approximately 5 million people in the Emscher catchment area. Annually, around 120,000 tons of sludge are processed in two ovens of the associated heat and power plant.
INNOVATIVE AND SUSTAINABLE SLUDGE DRYING PROCESS
The sludge must reach a specific dryness level before it can be incinerated. Previously, 20.000 tons of coal were used annually for this purpose. Thanks to a new solar-thermal drying system, this coal usage has been significantly reduced. This innovative system lowers environmental impact and conserves valuable resources, making Bottrop home to the world's largest solar-thermal sludge drying system.
TWO-STAGE EMISSION TREATMENT
The sludge is dried in 32 halls, similar to greenhouses, with a drying surface of approximately 40,000 square meters. During the drying process, odours and inorganic compounds are released. A two-stage process was chosen for emission treatment due to varying emission levels. In the first stage, air scrubbers remove inorganic compounds like ammonia. Each hall has its own scrubber, totaling 32 compliant with the Wasser Haushaltsgesetz (WHG). These air scrubers are equipped with specially developed double-walled casing panels. After passing through the scrubbers, the air is further treated in biofilters to eliminate odours.
SUCCESFUL IMPLEMENTATION
Construction of this project began in 2019, and the installation has been fully operational since 2022. The scale and technical requirements of this project were challenging. AEC Systems designed and built very large scrubbers, which were produced in sections, transported, and assembled on-site. The Bottrop project includes 400 meters of scrubbers. The connecting fluid lines also required precise planning and execution.
COMPLETE INSTALLATION APPROVED
The air treatment system comprises 32 scrubbers, fans, biofilters, 400 meters of air ducts, kilometres of piping, a chemical storage tank, and purge water tanks. The entire installation has been approved by TÜV Nord and meets all WHG requirements.
