Specifications include, but are not limited to: The equipment shall have a stationary perforated screen with internal rotating screw conveyor. Liquid sludge shall be pumped into the interior of the screens, flow through the perforations into the screen housing, and then exit the unit. Solids captured on the screen shall be automatically removed from the screen section, compacted, and dewatered by the internal screw mechanism. Screenings shall discharge through a retention nozzle and pressure regulating cone into an external screenings receptacle. General: The current strain presses at BMF are no longer supported and spare parts are becoming harder to source. Below are the performance requirements for the replacement units. PERFORMANCE REQUIREMENTS Suitable for the following feed sludges and conditions: 1. Type of Sludge: Mixture of anaerobically digested primary sludge and secondary waste activated sludge and facultative lagoon sludge. 2. Feed Solids: 1 to 6 percent with 2-4 percent normal inlet concentration. 3. Volatile Suspended Solids: 35 - 65 percent. 4. pH Range: 5 - 8 with normal pH range of 6.5 to 7.5 5. Sludge Temperature: 50 to 95 degrees F with normal range of 65 - 75 degrees F. 6. Suitable for sludge containing the following compounds at 10 ppm or less: hydrogen sulfide, nitrogen, carbon dioxide, and methane gas...
