Wastewater Treatment Plant Headworks Upgrade Project


The Dalles, OR

Portland Engineering provided comprehensive instrumentation and controls design upgrade services for the Dalles Wastewater Treatment Plant’s Influent Pump Station (IPS) including and the construction of new Headworks and Solids Digestion. Portland Engineering is working closely and successfully with the Design/Builder for this project on improvements that helped to bring the plant’s influent pumping capacity into conformance with the DEQ’s criteria for firm pumping capacity and improved the screening and grit removal process at the plant’s headworks. Additionally, the expansion of the solids digestion system allowed for the implementation of a new micro turbine, cogeneration system.The IPS upgrades included replacement of three existing pumps and associated piping, along with electrical improvements to accommodate the new pumps. The existing headworks structure is being retrofitted to allow for installation of a new primary filter and an additional structure was built for new multi-rake screens and grit removal system. The existing Grit Room was converted to an electrical room and received new MCC’s, transformer and master control panel. Construction of a new 40’ diameter digester and control building included mixing pumps, heat exchangers, gas conditioning systems and micro turbines, allowing the plant to collect gas and convert it to electricity. Monitoring and control of all new or updated systems is being integrated into the existing SCADA system.