Client: Clearfield Municipal Authority
Year Completed: 2004
Project Cost: $2,200,000
Constructed in the late 1950’s, the Clearfield wastewater treatment facility needed a process upgrade to meet increasing system demands. As an initial project, the Authority’s consulting engineer, Gwin, Dobson & Foreman, Inc., designed solids handling and settling improvements along with other system enhancements.
The project included the following work items:
- Replacement of anaerobic sludge digester floating covers with two (2) 45-foot diameter covers (gasholder type) and sludge mixing system (7.5 HP, 27″ diameter, 8,000 GPM recirculation mixers). The system consisted of a dome framework, support beams, compression ring, center dome, roof plates, slide assemblies and slide guides, manholes, sampling ports and pressure relief-vacuum breaker with flame arrester.
- Design of new sludge dewatering system consisting of solid bowl, horizontal continuous feed, scroll type centrifuge (50 GPM, 4,000 RPM, high solids). The system is located in a separate solids handling building with control system, sludge feed pump, emulsion polymer feed system, screw conveyor, in-line comminutor and solids storage.
- Replacement of primary clarifier sludge collector mechanisms for two (2) 60-foot diameter settling basins.
- New equipment and dewatered solids storage building.
- Installation of chlorine contact tank sluice gates and valves.
- Replacement of 2,100 LF of 18″ Hyde City interceptor sewer.
Gwin, Dobson & Foreman, Inc. provided all engineering, design, environmental, permitting and construction phase services. GD&F also administered the Pennvest project financing documents.