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Efficient and safe sewage sludge recovery

In the future, the new plant owned by KLAR GmbH will thermally treat municipal sewage sludge from Cologne and the surrounding region in a safe, efficient and legally compliant manner. Furthermore, the relevant regulations on limiting odour emissions will be reliably met, and the generated ash will provide the basis for phosphorus recovery.

At the heart of the plant is a bubbling bed furnace, which ensures highly efficient thermal recovery of the dewatered sewage sludge thanks to its excellent mass and heat transfer. An innovative concept for heat recovery and electricity generation ensures largely self-sufficient plant operation. 

Multi-stage flue gas cleaning for the most stringent requirements

In order to meet strict emission requirements, Doosan Lentjes is supplying a multi-stage flue gas cleaning system that reliably removes dust, acid gases, heavy metals and organic pollutants from the flue gas. The system comprises an electrostatic precipitator for the separation of fly ash, a Circoclean® reactor, which removes acidic pollutants and heavy metals using hydrated lime and hearth furnace coke, followed by a fabric filter for the removal of residues. A downstream, two-stage wet flue gas cleaning system with an acidic quench stage and an alkaline scrubber stage further reduces the remaining pollutant levels in the flue gas. The wastewater-free system with continuous emission monitoring meets the highest environmental and emission standards.

Combined technological expertise

“We are delighted to be able to apply our in-house technological expertise in fluidised bed combustion and flue gas cleaning to the Cologne project,” says Philipp Stolzenburg, Director Sales & Proposals at Doosan Lentjes. “We are thus offering our customer an integrated, single-source solution for sewage sludge treatment that guarantees long-term disposal security and compliance with legal requirements. At the same time, the plant makes an important contribution to environmental and resource protection.”

Expansion of the mono sewage sludge treatment product line

With the successful contract in Cologne, Doosan Lentjes is now once again applying its expertise in the thermal treatment of sewage sludge in Germany. Against the background of stricter legal requirements, this market is of great importance. This is particularly true in view of the mandatory recovery of phosphorus from sewage sludge in Germany from 2029 onwards, as well as the resulting increasing demand for thermal treatment plants for sewage sludge. The Cologne contract is therefore an important milestone for Doosan Lentjes’ business activities in its home market.

Doosan Lentjes, based in Ratingen, Germany, specialises in environmental technologies for efficient resource utilisation and offers tailor-made solutions for the thermal treatment of waste and sewage sludge.