WCW24

Many communities have either SSS or CSS, which collect stormwater and I/I in addition to sanitary and industrial wastewater discharges. This type of collection system frequently results in the flow capacity of the sewers being exceeded during wet weather events. When the flow capacity of these sewer systems is exceeded it results in sewer surcharging and frequent discharges of wastewater overflowing from the SSS or CSS systems into adjacent streams. Solutions to resolve this problem have included separation of combined sewer systems, transporting wet weather flows in excess of the existing combined sewer system capacity to a storage facility for subsequent treatment at a wastewater treatment plant (WWTP), transporting the excess wet weather flow to the WWTP after expanding its peak flow capacity, or transporting the excess weather flow to a combined sewer overflow (CSO) treatment facility located either at a WWTP or remotely in the collection system. This presentation will review viable technologies for expanding biological capacity with advanced primary treatment and wet weather treatment. Pile cloth media filtration (PCMF) is now being used in a wide range of primary and wet weather conditions within treatment facilities or in the network (overflow sites). The application of PCMF for advanced primary and wet weather treatment has been applied on a range of influent solids conditions from primary influent, primary clarified effluent and combined secondary clarified effluent with the primary influent or primary clarifier effluent. The ability to handle the range of influent conditions allows the technology to be placed in multiple locations within a treatment facility or at remote overflow sites. Also, PCMF is being used in dual treatment applications providing value to a facility across a range of operating conditions. PCMF achieves very high solids removal without chemical addition. The removal efficiency is typically greater than 80% of TSS, with applications demonstrating removal in excess of 90%. This high removal of TSS is also achieved in a very small footprint which is typically 15 to 20% of primary clarification for comparison purposes. The high removal efficiency allows more capacity to be achieved through biological treatment train if used to replace primary clarifiers. This allows more wet weather flows to be treated through the main treatment train. For wet weather only treatment, the technology is being used in auxiliary side-stream treatment trains or in dual use application of tertiary treatment and wet weather flow treatment. The technology spotlight will focus on the many of the projects that are operating or in design. The areas to be covered will be the following: - The performance from operating installations and testing conducted for facilities under construction and/or design for advanced primary and wet weather treatment - Space requirements based on influent condition - Influent water quality and flow information needed for the design of a wet weather system - Handling of waste solids removed during treatment - Automation requirements for wet weather treatment to minimize operator attention - Instantaneous startup capabilities - General operating costs In summary, the technology spotlight will show how the technology of PCMF can be applied in multiple locations within a treatment facility or remote overflow site to help a utility to achieve the following: - Expansion of an existing biological treatment train capacity - Meet facility permit requirements (water quality) - Eliminate untreated wet weather flows