ALCOSAN will be soliciting Statements of Qualifications for the final design of the Solids Thickening and Dewatering Improvements project.   

As part of the Wet Weather Plant Expansion, it has been deemed necessary that the waste activated sludge (WAS) that is currently returned to the primary clarification process from the secondary clarification process can no longer be co-settled in the primary sedimentation tanks.  Modifications are required to the so that WAS will instead be thickened by centrifuges and returned to the dewatering process. 

The project will generally include design of the following scope of work:

• Selecting and specifying dewatering and thickening centrifuges
• Additional centrifugal pumps
• Review, analysis, and determination of current dewatering facility building structure and necessary modifications to efficiently operate and properly support the new and current centrifugal thickening equipment
• Analysis and design of the new thickening process piping, pertaining to sludge-fluid control and transport to the dewatering facility
• Determination of all aspects of the process regarding the working interaction between the new thickening equipment and currently operational equipment in the dewatering facility.

  The tentative schedule for the project in its entirety is as follows:

  Design Phase:                                       December 2022 – October 2023

  Bid Phase:                                             October 2023 – January 2024

  Construction Phase:                              February 2024 – September 2025

  Operational Demonstration Phase:        October 2025 – December 2025