FY2023 Adopted Budget

PUBLIC WORKS

Department

V3174

Project #

Tim Wilkey

Contact

Project Name Aeration Equipment Improvements

One Phase

Type

20 years

Useful Life

GRANTEE NONE

PLAN None

Wastewater Treatment

Category

MATCH % NONE

TIF DISTRICT None

Efficiency Improvement (3)

Priority

Description Phase 1: Replace the remaining mixers in the aeration trains 1 - 4 with high efficiency mixers matching those placed in Cell 9 of trains 1-4 and replace mixers in the high strength tank. This would be total of 30 mixers. Phase 2: Replace Lamson 300 HP Centrifugal Blower with a High Speed Turbo Blower including any ancillary equipment, pipe modifications and PLC programing. Justification Phase 1: Most of these mixers are original to the 2002/2014 construction and have been rebuilt at least once at a cost of $7,000 to almost $10,000 apiece. They typically operate 24hs/7 days a week when the trains are in service. Replacement with the higher efficiency mixer with lower horsepower will decrease energy usage and continue to reduce our carbon footprint. Estimated cost savings over a 20-year period were estimated to be in excess of $600,000 when all 30 mixers in operation. Phase 2: The existing Lamson Blowers were placed in service in 2002 as part of the first iteration of the activated sludge process units. The blower is a "starts across the line", meaning that it's either on or off and cannot be regulated with Variable frequency drives. Because of this and it's HP capacity, it has high starting amps that affect our electrical peak loading billing with REC. The New High Speed turbo blower uses a VFD which eliminates the inrush of power, allowing us to regulate our peak loading and work at a lower operating amperage. Total Project Cost: $3,506,000 Status Active

Future

Expenditures

Total

2022

2023

2024

2025

2026

1,470,000

PLANNING/DESIGN

10,000

10,000

CONSTRUCTION

2,000,000

2,000,000

Total

INSPECTION

4,000

4,000

ADMINISTRATION

2,000

2,000

CONTINGENCY

20,000

20,000

2,036,000

2,036,000

Total

Future

Funding Sources

Total

2022

2023

2024

2025

2026

1,470,000

WASTEWATER FUND

2,036,000

2,036,000

2,036,000

2,036,000

Total

Total

Budget Impact/Other By replacing the Lamson blower with a high speed turbo blower, we anticipate a 10% reduction in power cost for the foreseeable future. The estimated annual savings is less than $10,000 per year.

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