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Nuisance odors may be generated while cleaning the lagoons. Completely Mixed Digesters (Low Rate) The most common form of an anaerobic digester is the completely mixed reactor. Most sewage treatment plants and many industrial treatment plants use a completely mixed reactor to convert waste to gas. The completely mixed reactor is a tank that is heated and mixed. Most completely mixed reactors operate in the mesophilic range. All of the initial anaerobic digesters used to treat dairy manure were completely mixed mesophilic digesters. The cost of mixing is high, especially if sand, silt, and floating materials, present in the waste stream, must be suspended throughout the digestion period. Some completely mixed reactors operate in a thermophilic range where sufficient energy is available to heat to reactor. Highly concentrated readily degradable waste is required in order to generate sufficient heat for the thermophilic range of operation. Completely mixed thermophilic digesters are used in the EEC to treat animal manure(Ahring, Ibrahim et al. 2001). Recently, completely mixed thermophilic digesters were proposed in Oregon to treat dairy manure(Tillamook 1999). Figure 8 – Completely Mixed Reactor Most completely mixed reactors are heated with spiral flow heat exchangers. These heat exchangers apply hot water to one side of the spiral and the anaerobic slurry to the other. The spiral heat exchangers have proven to be a successful method of efficiently transferring heat. © Environmental Energy Company 28 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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