Thanks to a project for more than 10 million Czech crowns, it will be possible, if needed, to connect for example Mokré Lazce, Štítina or Nové Sedlice to the extended wastewater treatment plant

Ostrava 17. 7. 2017 – At the end of June, an important investment project started, which consists in building new structures on the premises of the wastewater treatment plant in Háj ve Slezsku and installation of extended process equipment in current facilities to make the operating capacity sufficient for possible connecting of new areas. At times, due to new residential development and gradual connection of new households, the current wastewater treatment plant is used to full capacity. The technology extension will enable the construction to continue also in locations already connected. It will be finished at the end of the year.

 "The current wastewater treatment plant was designed based on a planned phasing consisting in its gradual loading and subsequent capacity extension. So at present, it treats wastewater from Háj ve Slezsku and its local parts Chabičov, Smolíkov and Lhota u Opavy. The current investment will enable us to gradually connect other locations. I know that there are discussions at these municipalities on how to deal with wastewater treatment in the future. Thanks to this investment, we will be prepared," says the director of sewer system, SmVaK Ostrava, Jan Tlolka.

During the construction, structures for rough pretreatment (gravel trap), sludge treatment (sludge lagoon for sludge stabilization) or rain water basins to hold water in heavy rainfalls will be built, including relevant process equipment.

Necessary process equipment will be installed on current structures to provide sufficient capacity for connecting new locations. Thus the second corridor of the wastewater treatment plant, which is prepared from the construction point of view, will be put into operation.

The wastewater treatment plant in Háj ve Slezsku was built in 2003. Its designed parameters correspond to wastewater treatment for 2200 population equivalent. It can treat almost 121 thousand cubic meters of wastewater a year.

Remarks

Screen – process equipment used to remove floating impurities from wastewater. The trapped impurities are called screenings.
Mechanical part of the wastewater treatment plant – first part of the plant at the inflow of wastewater from the sewer system. Gravel trap, screen and sand trap, sedimentation tank where coarse floating impurities and undissolved substances are removed

Biological part of the wastewater treatment plant – follows after the mechanical part. Bacteria are used to remove pollution, it includes also the aero-tank and settling tank.

Agitator – mixes the activation mixture (wastewater, activated sludge) in order for the organic impurities in mechanically pre-treated wastewater to be efficiently broken down.

Aeration elements – are used to mix and aerate wastewater in aero-tanks in the biological part of the wastewater treatment plant.

Aero-tank – heart of the wastewater treatment plant; aerobic bacteria with air, which is constantly forced into the tank, with its metabolism remove 99% of organic water pollution.

Settling tank – treated water is separated from the activated sludge that sediments. Treated water runs back to nature.