FY2022
Contact Tim Wilkey Department PUBLIC WORKS
V3167
Project #
Project Name Replace Grit Classifiers
Type One Phase
Useful Life 20 years
GRANTEE NONE
PLAN None
Category Wastewater Treatment
MATCH % NONE
TIF DISTRICT None
Priority Essential (2)
Description Replace the Grit Classifiers located in the Grit Building including any required piping modifications. Include installing an automatic liming system to meet IDNR grit disposal requirements. Justification The grit classifiers were installed in 2002, one requiring a major frame repair in 2015. Multiple rotating parts have been replaced over the past 5 years and the equipment has reached it useful design life. IDNR rules require raising the pH to 12 for 2 hours. Current liming manually spread lime over dewatered grit. This can expose the staff to lime dust thats shown to be a source of silica dust. An automatic liming system reduces that staff exposure. Grit removal is critical in the operation of the WWTP in meeting its NPDES permit requirement and reduceing wear and tear on down steam pumping. The grit classifiers are near the end of their useful design life. Total Project Cost: $200,000 Status Active
Expenditures
Total
2021
2022
2023
2024
2025
PLANNING/DESIGN CONSTRUCTION
5,000
5,000
175,000
175,000
INSPECTION
1,000
1,000
CONTINGENCY
19,000
19,000
200,000
200,000
Total
Funding Sources WASTEWATER FUND
Total
2021
2022
2023
2024
2025
200,000
200,000
200,000
200,000
Total
Budget Impact/Other These projects should lower operating expenditures through the replacement of aging infrastructure. The estimated annual savings is less than $10,000 per year.
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