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Project Details
Transportation & Government Services
Rehabilitation of Lime Silos
Exterior painting of two lime silos. Safety upgrades to improve access to the top of the silos for the maintenance of screw conveyors and bucket elevators including the purchase and installation of a hoist for the safe transport of equipment. The replacement of the catwalk between the two silos.
Organization Details
City of Dayton
101 West Third Street
Dayton, Ohio. 45402
Montgomery
Same
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Montgomery
Government
Organization Contact Details
Rosalind Bertolo
Special Projects Administrator
City of Dayton
937-333-3755
320 West Monument Avenue
Dayton, Ohio. 45402
Montgomery
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Location Details
Dayton
Montgomery
Ohio 10th
Financial Details
560000
700000
Water Capital Funds
Construction or Capital
Yes
The Water Capital Fund has sufficient cash to provide the match.
Yes
Immediately
OEPA Division of Environmental and Financial Assistance, State Revolving Loan Fund
Community Details
Rehabilitation of Lime Silos
The City of Dayton has two 96 MGD water treatment plants that use traditional lime softening for the treatment of groundwater. The two treatment plants produce approximately 700,000 gallons of residuals yearly. For many lime softening systems, the residuals created by the lime softening process are disposed of in landfills - this is not the case in Dayton. Dayton Water takes the normally unusable residuals and processes them through the kiln. Once processed in the kiln, the residuals become usable calcium oxide (lime) used in the water treatment process.

Dayton, Ohio, and Miami Dade, Florida are the only two municipal water systems in the country that operate a kiln to recycle calcium carbonate residuals into usable lime.

The purchase of lime for water treatment is expensive, and so is the disposal of the calcium carbonate residuals. When the Lime Reclamation Facility (LRF) is operating normally, the need to purchase lime for softening is eliminated.

The LRF also provides carbon dioxide used for pH adjustment at the Ottawa Water Plant. In 2012, the City of Dayton embarked on a trial project to import residuals from outside water systems to optimize the efficiency of the kiln. A 2017 LRF expansion allows the importation of outside residuals and the sale of pebble lime to outside systems. This increased production has the added benefit of optimizing energy use at the kiln.

The excess lime resulting from the higher production rate is then sold back to the other water systems for their use in water treatment. This recycling program is a regional asset that makes Dayton’s water treatment process more cost-effective and efficient and benefits other municipalities. Residuals are an essential commodity for Dayton Water.
Lime is a somewhat fragile product that requires a dry storage silo. Once lime gets wet, it creates an exothermic reaction, which produces heat. This reaction can expand the storage container holding the product. Therefore, the product must remain dry before use in the water treatment process. Dayton has three lime storage silos at the Lime Reclamation Facility. The two older silos are both roughly 85 feet tall. The first of these older silos holds 720 tons, and the second 500 of dry lime.
The existing exterior coating on these silos needs to be upgraded to meet storage standards to ensure that the regional product produced is protected. The upgraded coating will maintain a watertight environment for the storage of lime and extend the life of the silos.
In addition to upgraded coating, the two older silos need a new hoist to improve access to the top of the silos. The new hoist will ensure the safety of personnel performing routine maintenance at the top of the silos. This new hoist will allow for the safe transport of equipment to the top of the silos for use during routine maintenance.

Finally, the two older silos are connected at the top by a catwalk. This catwalk is near the end of its useful life, and replacement is included in this project.
No
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Additional Details
No
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Rosalind Bertolo
937-333-3755
rosalind.bertolo@daytonohio.gov
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