Future project university medical centre Schleswig-Holstein

The vision of the federal state of Schleswig-Holstein behind the reorientation of its university hospitals in Kiel and Lübeck is to merge teaching, research and clinic into a single entity at both locations. In this way, all areas are to be strengthened through interdisciplinary work. The very extensive building measures required for this have now been largely completed. A new, ultra-modern centre for research and teaching has been created on the Lübeck campus, with new auditoriums and laboratories, which, together with the existing institutes, should now provide the desired synergies. Here, wastewater technology from the East Westphalian pump manufacturer Jung Pumpen ensures trouble-free drainage.

Requirements for the waste water technology

The engineering office Meyer from Eckernförde, which was commissioned with the planning, focused on the highest quality and reliability for the sewage technology. Due to the extensive conversion and new construction on the Lübeck campus, it was necessary to reorganise the sewage disposal of the existing buildings. A wastewater pumping station for laboratory wastewater and domestic wastewater from the preclinical institute as well as a rainwater pumping station for water from gutters, drains, light shafts and for surface water was tendered. On the basis of the terrain data on site and the expected flow rates, the planning team became active at pump manufacturer Jung Pumpen in Steinhagen and dimensioned the necessary shafts, pipe diameters and wastewater pumps and also offered the appropriate control technology. For the new pressure pipes to be laid, a culvert and thus a higher flow velocity of the sewage (1 m/s) had to be taken into account in the dimensioning.

PKS- plastic sewage sumps

Both sumps are made of high-quality polyethylene (PE-HD) and were individually manufactured according to the requirements. Both the height and the diameter of the PKS sumps are flexible and in this case resulted in a height of 3 m (diameter 1.20 m) for the wastewater pumping station and a height of 3.60 (diameter 2 m) for the rainwater pumping station. In general, Jung Pumpen offers sumps with heights of up to 7 m and diameters of up to 3 m. The buoyancy-proof and groundwater-tight sumps were delivered ready for installation (including pre-assembled guide rail systems, pressure pipes and stainless steel ladders), together with the cover plates directly to the construction site. The low weight of even large sumps makes them easy to transport and move. A long service life is guaranteed by the corrosion-free plastic. Especially for long residence times of wastewater containing faeces and the resulting formation of hydrogen sulphide, the PE shaft has meanwhile become generally accepted in comparison to the traditional concrete shaft.

MultiFree vortex impeller pumps

MultiFree vortex impeller pumps were selected for both pumping stations. These are particularly suitable for the disposal of wastewater containing fibres, solids as well as surface and rainwater. With regard to the hospital wastewater to be disposed of, it was assumed that mainly fibrous materials (wet wipes, medical wipes, etc.) are contained in the wastewater. MultiFree pumps are not susceptible to clogging and are therefore very reliable in operation, which guarantees reliable wastewater disposal in hospital operations. They are also particularly suitable for the disposal of drainage and surface water, as they are insensitive to its abrasive components. The pumps used are designed for use in explosion protection zone 1, as both pumping stations are connected to the public sewer system. The installation of the pumps as well as their later maintenance are easy to carry out due to the integrated guide rail systems and the open construction of the sumps.

HighLogo microprocessor control unit

The HighLogo microprocessor controls for this project were individually planned at Jung Pumpen according to customer requirements and manufactured in the company's own control engineering department. Both control units, for the wastewater and the rainwater pumping station, were accommodated in a common outer housing. Here the measured values of the hydrostatic submersible probes located in the sumps arrive and are transmitted to the control system. Depending on the programming, the control unit switches the pumps on and off depending on the level. As a redundancy an additional submersible switch was installed in each case, which triggers the pumping out in case of a failure of the probe, starting from a previously defined maximum water level, and thus reliably prevents overflowing of the sump.

The control unit is easy and intuitive to operate, at the same time the information menu protects against accidental changes of settings. An illuminated display shows important parameters such as operating hours, switching pulses, water level values in the sump and error messages in plain text. All events can be called up from a ring memory for 70 events via the information menu.

The HighLogo control can also be equipped with a GSM modem, which can be used to transmit messages as SMS and/or e-mail to suitable terminals. In the current case, the fault report is sent via the building management system of the medical institute. Both pumping stations are also connected to an emergency power generator, which ensures their operation in the event of a power failure.

Conclusions:

Reliable and trouble-free wastewater technology is of the utmost importance during ongoing clinical and research operations. A complete package of high-quality and coordinated components, which are planned, dimensioned and built individually according to customer requirements, provides the necessary safety here. Also the good manageability on the construction site, due to the easy moving of the light and completely pre-assembled plastic sumps, brings many advantages. The complete package from one source finally convinced the decision makers of this major project.