UPGRADING WASTEWATER TREATMENT PERFORMANCE

摘要

In the Czech Republic, 70% of the domestic sewage is collected and treated in existing wastewater treatment plants (WWTPs). There are about 900 existing WWTPs. In order to comply with the EU legislation and the European urban wastewater directive, existing WWTPs need to be rehabilitated or upgraded. Considering the high number of existing WWTPs this could result in high costs. The development of designs and subsequent construction of new medium-sized and large-sized WWTPs in the Czech Republic has finished. In exceptional cases, old WWTPs will be relocated to new sites. The last major large-size WWTP servicing the town of Decin has been completed and future development of wastewater treatment in the Czech Republic will concern the refurbishment and updating of existing WWTPs. Biological wastewater treatment using the activated sludge process has become the prevailing technology and this trend will certainly continue in the near future. The technological line itself is or must be modified as enforced by the valid legislation, and consequently, systems with enhanced nitrogen and phosphorus removal must be introduced.