Wastewater processes under control

Wastewater processes under control

SPANGLER – the Plus of Environmental Technology.

A large dairy in the North of Germany, which is specialized in long-life dairy products, concluded the expansion of the production site with a tower for the milk powder production at the beginning of 2021.
This significant enlargement made an extension of the sewage treatment plant by filtering and cooling of the wastewater indispensable. We were commissioned by HUBER SE to carry out the construction of the control cabinet for the sewage treatment plant, as well as programming, cabling and start-up.

Official regulations determine the wastewater process

The wastewater that results from the production processes must be treated in several steps. After the biological cleaning, dissolved pollutants and phosphate residues are separated from the liquid substances in a HDF dissolved air flotation plant by HUBER SE. Then the temperature is extracted from the filtered water by a RoWin wastewater heat exchanger. The cooling process is especially important, as the cleaned water is lead in a nearby stream (receiving water). Official regulations determine that the temperature of the stream must not be increased by more than 1.5° degrees after the water was led in. The residual sewage sludge from the filtering processes of the HDF and the other sludges from the biological cleaning are dewatered and disposed after a digestion process in a Q-Press®.

No compromises on the plant control

The control systems by Spangler Automation provide a professional control of the sewage treatment plants and cooling plants. Besides the assembly and the cabling of the switch units, three PLC Siemens S7 were programmed and integrated in the existing and established control system of the customer. Special attention was paid on the strict implementation rules, which had to be met accurately for any work on the hardware and software. Via Siemens WinCC the plants are now controlled directly via the touch displays in the production rooms or via the control centre. In order to continuously ensure the high quality of execution, Spangler Automation took over the complete electrical installation of the plants. Particularly challenging was the welded design of the stainless steel cable channels and hose system of the pneumatic valve cluster.

The start-up of the plant was unproblematic and to the fullest satisfaction of our customer Huber SE and its end customer. The additional installations are currently being completed and are scheduled for launch in 2021.

Intuitive operation via touch display
Detail of the local Remote I/O station