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Figure 10 – Contact Reactor Gas flotation can also remove enzymes(Burke, Butler et al. 1997), organic acids (Burke 1997), and other products of digestion that cannot be removed through settling or other mechanical means. Finally, gas flotation can be performed in a non-mechanical manner, which is simple to operate and maintain. During the contact process, refractory organic and inorganic solids accumulate within the system. The accumulated sands, silts, and non-degradable organic fibers dictate the rate of solids wasting. Wasting the nonbiodegradable solids causes the loss of bacterial mass and reduced process efficiency. The anaerobic contact process can utilize mechanical separating devices to remove refractory solids from the digestion system (Burke 2000). Sequencing Batch Reactors (High Rate) A sequencing batch reactor is a contact digester, which utilizes the same tank for digestion as well as separation. In a sequencing batch reactor the same tank is used to digest the waste and separate the biomass from the effluent liquor (Dugba, Zhang et al. 1997). Generally, two or more tanks are used. The tanks are operated in a fill and draw mode. The separation is accomplished by gravity. Consequently, a more dilute, screened waste is treated. Laboratory scale sequencing batch reactors have been used to digest dairy manure. Contact Stabilization Reactors (High Rate) The anaerobic contact stabilization process is a more efficient contact process. Burke used the anaerobic contact stabilization process for the digestion of both © Environmental Energy Company 32 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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