Olympus Technologies, Inc. (OTI) products

Concentric Tube Heat Exchangers are often used to maintain heat in the anaerobic digesters.  Sludge from the digester is circulated through the inside tubes of the heat exchanger while hot water is passed through the surrounding outer tube as illustrated below.  Heat exchangers are also designed to warm incoming sludge before it is transferred into the digester.  Another application may be for cooling sludge from thermophilic biological processes.

To complete digester heating systems OTI often supplies Dual-Fuel Boilers designed to fire on the methane gas produced in the anaerobic digesters. The boiler is used to heat water that is necessary for the heat exchangers to heat  the sludge in the digesters. The Dual-Fuel Boilers can fire on a supplemental fuel source such as natural gas, propane, fuel-oil, etc. at periods when there is insufficient digester gas available.

Protects gas lines from periodic fouling with digester “foam”.