Increase in efficiency with simultaneously lower emissions has been the key driver for the new design of the headworks of the Köhlbrandhöft-North sewage treatment plant in Hamburg. Hamburg's municipal sewage company AöR planned a two- stage screening system including the screenings treatment for a maximum stormwater inflow of 9 m³/s with single redundancy (n+1 channels) in each case. The 5–channel inlet screening equipment has been fully encapsulated including the distribution channels and shut-off devices, thus avoiding odours.
Hamburg, Germany
Passavant® Multi-Rake Bar Screens
10 Passavant® Multi-Rake Bar Screens with Wash Presses for the new headworks building of the Köhlbrandhöft WWTP in Hamburg, Germany
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Situation
Customer
Hamburger Stadtentwässerung AöR
20539 Hamburg, Germany
Commissioning
28. October 2020
Solution
After a construction period of two years, the new headworks building with 5 fine and 5 coarse screens, each as Passavant®/Geiger® KUR-C Multi-Rake Bar Screen was commissioned at the end of October 2020. These were designed as constant-flow screens with an angle of 75° which were installed in a channel completely lined with PE-HD. Both the coarse and fine screens were fitted with flow-favourable bar profiles in order to keep hydraulic losses as low as possible and thus to increase plant efficiency. Each screen has been equipped with a highly efficient combined conveying, washing and pressing screwpress with a downstream screenings shredder and a baffle for distribution. Troughed belt conveyors transport the screenings from the deflector flaps to the cross conveyors located inside the container building. For redundancy reasons, two conveyor belts are installed behind the coarse screens and two conveyor belts behind the fine screens. The entire construction was carried out in an encapsulated design with correspondingly adapted transitions, so that no emissions are to be expected along with the system.
Key Features
- Completely hygiene-enclosed system
- No chain wheels in the submerged area
- Flow-favourable bar profiles
- Short cleaning cycles due to the installation of 6 cleaning elements per machine
- Maintenance-free roller chains made of duplex steel
Technical Data
5 x Coarse & 5 x Fine screens Passavant® Multi-Rake Bar Screens KUR-C:
Channel depth: 3,300 mm
Channel width: 2,000 mm
Bar spacing: 6 / 20 mm
Discharge height: 1,500 mm
Installations angle: 75 °
Material: 1.4571
Roller chains in duplex steel: 1.4462
10 x Noggerath® Screenings washing presses NWP 400
Drive power: 4 kW
Throughput capacity: 5.6 m³ /h
10 x Penstocks
6 x Sluice gates
13 x Stop plates
Various ventilation pipes and conveying systems