First HOBAS CSO Chamber in Germany

The collection and discharge of storm- and wastewater represents a daily challenge for wastewater facilities and municipalities. In combined systems, domestic, commercial, and industrial sewage and stormwater are all transported to the wastewater treatment plant by one shared sewer. Due to an increase in heavy rain events, sewers are frequently surcharged and wastewater treatment plants reach their capacity limit. For the system to operate flawlessly even at peak times, stormwater retention basins are installed at suitable points. In combination with overflow structures, they regulate the water quantity to be led to the wastewater treatment plant. The retention basins serve as temporary storage from which the wastewater is gradually discharged.

HOBAS offers two alternatives to conventional retention basins: the HOBAS CSO (Combined Sewer Overflow) Chamber, a modular overflow system for combined sewers with low-maintenance solids separation, and GRP storage systems.

In cooperation with the CVUT University Prague and in compliance with the EU Water Framework Directive 2000/60/EC, HOBAS developed a particularly efficient GRP overflow system for combined sewers: The HOBAS CSO Chamber separates solids from liquids very efficiently and directs them to the wastewater treatment plant, while the cleaned part of the water is discharged into the receiving water course.

Every single HOBAS CSO Chamber is made to measure. Compared to conventional sewer overflow systems, the HOBAS CSO Chamber provides numerous advantages: Its cleaning performance is much better even at low flow rates, production time is very short, installation quick and easy, operation problem-free, the unit requires only little space and excavation – and not least, it helps protect the environment considerably.

The first HOBAS CSO Chamber was installed in 2007. Up to now, several projects have been realized in Slovakia and the Czech Republic. The first HOBAS CSO Chamber in Germany was implemented in Thuringia in fall 2013. The products’ numerous advantages convinced the client and the designer – instead of the originally planned concrete structure, they opted for the new HOBAS Technology. Apart from the CSO Chamber, HOBAS also supplied the pipework as well as the pumping station for the throttled outlet leading to the wastewater treatment plant.