Edmonds WWTP Sludge Dewatering Improvements


BHC performed process, mechanical, electrical, lighting, and structural design for design of two new screw dewatering presses in lieu of the two existing belt filter presses, new shaft-less screw conveyors for conveying dewatered cake to a and modified dry cake storage hopper (DCSH). The project also included upgrades to the WAS/RAW blending process. Installation of the screw presses and conveyors was accomplished while maintaining uninterrupted biosolids dewatering operations throughout the course of the project.


  • Conversion to 24/7 dewatering operation
  • Expansion of dewatering capacity
  • Constrained access and complex construction sequencing