Aerial view of the construction progress in autumn 2020
From then on, 33,000 t of dewatered sewage sludge (dry matter content of 25%) and 2,700 t/a of externally dried sewage sludge (dry matter content of 90%) can be energetically utilised annually. The main components of the sewage sludge mono-combustion plant designed by the engineers of sludge2energy GmbH are a sewage sludge bunker including crane system, a HUBER Belt Dryer BT 20 including vapour exhaust air treatment, a S2E Fluidiser (fluidised bed furnace) with steam boiler and a dry flue gas cleaning system. The steam generated in the fluidised bed furnace is converted into electricity by a back pressure steam turbine and the low-energy exhaust steam from the HUBER Belt Dryer BT is optimally utilised.
The plant is integrated into the Recycling Management Park of Abfallwirtschaft Halle (AWH) on the site of the Schkopau landfill, which is currently in the recultivation phase. The first preparatory works for the construction of the sewage sludge mono-incineration plant Halle-Lochau started in August 2019 with the clearing of the construction site. This progressed rapidly, so that it was possible to start with the solid construction of the plant already at the beginning of November. The winter in Halle was kind to the project team, which is why the solid construction parts of the building were completed as early as March 2020.
The next step was the concreting of the floor slab, which forms the basis of the boiler house and the dryer hall. This concreting was successfully completed by the end of April 2020. Subsequently, the foundations required for the plant components could be poured and the concrete supports for the steel construction could be produced.
Until July 2020, various outdoor works were also completed. These include, for example, the ASL loading area, which enables the safe loading of ammonium sulphate. Ammonium sulphate solution (ASL) is a valuable fertiliser, which is produced during the exhaust air treatment of the sewage sludge drying process. In order to be able to load this safely into tankers, a loading area conforming to WHG (Water Resources Act) including a collecting tank was installed. The first surface layer of the plant's bypass was also constructed in order to be able to carry out the installation work in autumn and winter on clean ground.
The expansion of the plant's social building was continued over the summer. Here, the recreation and work rooms for the operating team are to be built and where the control technology for sewage sludge incineration and the turbine of the plant are to be accommodated.
The period before Christmas 2020 will be an exciting rather than a reflective time for the project. The core of the construction phase, the steel structure, will be completed before Christmas up to a height of +13.2m. After the Christmas break, the fluidised bed furnace and boiler are scheduled to be lifted to their original installation site on 11 January 2021 using a 400t mobile crane. Afterwards, the remaining large components of the flue gas cleaning plant will be lifted in and the rough assembly for both trades will take place.
The plant steel structure will be completed by the beginning of February and then the facade will be installed. Subsequently, all plant components will be assembled and electrically wired by May 2021.
Commissioning of the sewage sludge mono-incineration plant is envisaged for the second quarter 2021. The team of sludge2energy GmbH will keep you informed about the further progress of the project.
Via the following link you may view a time lapse video about the construction progress so far at HUBER's YouTube channel: https://youtu.be/mEbN3EVfVb4