In the second largest city of Sweden with about 500,000 inhabitants, the municipal company of the region Gothenburg Gryaab determined to replace its existing coarse screens on the city's main sewage treatment plant by new ones.
The city's wastewater and that of the whole Gothenburg region is collected on this sewage treatment plant and pumped into the inlet to four 20 mm coarse screens. The effluent from the coarse screens is pumped into a grit trap from where it flows by gravity through a 3 mm fine screen and then into the biological treatment system.
Due to the increasingly stringent limits for effluent discharge into surface waters the sewage treatment plant is continuously under technical optimization. As one of the optimization measures, one of the existing coarse screens on site was replaced by a HUBER Coarse Screen TrashMax 10510/2000/2172 with 20 mm bar spacing.
The function of the TrashMax is based on the operation principle of a multi-rake bar screen and designed as a heavy-duty coarse screen. Due its benefits, the National Water Company will now replace the four existing coarse screens of the North Plant on the main sewage works Manfouha in Riyadh by TrashMax units.
Furthermore, they will install another 100 mm TrashMax screen as first treatment stage for phase 3 of the Al Kharj plant.