Using Federal Grants and Low Interest Loans, A Small Oregon Town Purchases Therma-Flite’s IC 3600 Biosolids Dryer to Produce Class “A” Product

The City of Stayton: Hitory

Stayton, OR - Located at the foot of beautiful Silver Falls State Park, the town of Stayton, Oregon, population 8,000, would have been hard pressed to afford a state-the-art biosolids dryer to produce Class A end product. This is precisely why Rural Utilities Services, a Department of Commerce, Washington, D.C.-based federal agency was created; namely to support small rural townships in their efforts to keep their utility rates low. Stayton’s savvy independent engineering consultants made excellent use of a combination of federal grants and low interest loans to solve the city’s waste stream treatment challenges via the purchase of new IC Series Biosolids Dryer from Therma-Flite.

Stayton had been doing lime conditioning to produce Class B end product which was then transported to local farms for use on hay fields and other animal feed fields. Unfortunately the number of farms taking the Class B biosolids shrank to just one farm. The city began worrying what would happen when their long-term contract with this farmer ended. Class B end product disposal woes have been exacerbated seriously in recent years due to soaring transportation costs, storage problems and bad publicity leading to fewer and fewer disposal venues. Stayton’s engineering consulting firm began searching first, for funds and second, for the right dryer for Stayton’s criteria.

Equipment Selection:

After exploring equipment options from several manufacturers, Stayton settled on Therma-Flite’s IC 3600. Price, design, efficiency, and ease of operation were all factors in this choice. The Stayton plant only operates 5 days a week, 6 hours a day with a very lean staff. The Therma-Flite Bio-Scru continuous feed dryer was a good choice because it is fully automated and PLC-controlled requiring minimal operator interaction. In addition, the dual intermeshing rotor design is self-clearing, yielding a uniform Class A end product. Moreover, Therma-Flite’s sealed anaerobic chamber design is cleaner and safer. Based in Northern California, Therma-Flite is a leader in screw-type heat exchanger processing technology, with a long standing record for reliability.

Therma-Flite’s IC 3600 dryer is ample for current needs with surplus capacity for future growth. The city plans to retain its production mechanism for Class B as well, to use in down times and in summer when the biosolids can be dried in beds to save energy. Class A end product will be much easier to offload, and it can be sold to produce revenue, as opposed to Class B which incurs costs to be offloaded. Many local farms and homeowners are already expressing interest purchasing Class A biosolids from the city plant. The new dryer is scheduled for a fall 2010 delivery.

All in all, the purchase of the new Therma-Flite biosolids dryer will give Stayton greater security and economy going forward, according to Glenn Holdren of Keller Associates, the city’s engineering consultants. The benefits of the new dryer were made possible by Stayton’s resourceful use of funding. Equipment upgrades hit residents of small towns hard. Using Federal stimulus money takes the sting out of it. Holdren also utilized State funding from the Oregon Department of Environmental Quality (DEQ). The Army Corps of Engineering is another source to explore.

Therma-Flite’s IC Series Bio-Scru dryers are available in six different standard sizes from 800 lbs per hour water evaporation capacity to 12,000 lbs per hour water evaporation capacity. Larger sizes are available as custom designed units. The system is extremely efficient, has a small footprint and is very competitively priced.


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