Headworks Improvements
for Grace Creek WWTP
This project included the replacement of influent screening equipment and the construction of a new vortex grit removal system for the 20 MGD Grace Creek wastewater treatment plant (WWTP). The existing bar screens and grit removal equipment were aged and allowed excessive amounts of screenings and grit into the plant. This material was causing equipment failure in the primary clarifiers and downstream pumping equipment, negatively affecting treatment processes within the plant.
Pape-Dawson (as KSA) provided design-bid-build services for the replacement of the new equipment and structures. The project began with visits to other cities to help the City of Longview select an approved manufacturer for the needed equipment. Once these selections were made, the work consisted of:
1. Replacing two chain and rake bar screens with a total capacity of 60 MGD
2. Construction of a new 54 MGD vortex grit removal system including grit classifiers
3. Replacement of tertiary filter media
Removal efficiency of screenings improved from 30% to 75%, and grit removal was improved from 40% to 90%.
Project Type
Project Sub-Type
Wastewater
Treatment Design
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