Advanced Primary Treatment

Evergreen Engineering offers the Salsnes Filter for advanced primary treatment, sludge dewatering, and combined sewer overflow (CSO) applications. The Salsnes Filter cost-effectively reduces the organic load on downstream processes, which translates into more treatment capacity in existing plants and smaller downstream processes in new plants (with the associated cost savings). The Salsnes filter solves the problem of overloaded biological or chemical treatment plants, both Municipal and Industrial. The Salsnes filter is a modular and scalable system with no limitations in hydraulic design.

Removal of solids is facilitated utilizing a continuous-loop fine mesh screen (see Figures 2 and 2). Solids collect on the screen forming a mat of sludge. As the screen rotates, a patented air-blower system forces the retained screenings off the mesh and into the screenings hopper, virtually eliminating solids carry-over. Additionally, a patented hot water wash periodically removes any grease or other solids that may adhere to the mesh. An auger press dewaters the collected screenings while the filter effluent exits the unit.

The innovative technology behind the Salsnes Filter provides flexibility in wastewater treatment and reclamation plants. Screenings dewatering and odor containment are integrated parts of the machine, and the filters are compact, completely covered systems that are easy to maintain. The Salsnes Filter can be applied at municipal and industrial wastewater treatment plants to filter unwanted organic and inorganic solids from the wastewater flow. When compared with sedimentation as primary sewage treatment, the Salsnes Filter typically requires less than 50% of the capital investment and less than 10% of the footprint.