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dairy manure and potato waste. The process has the advantage of efficiently converting slowly degradable materials such as cellulose in a highly concentrated reactor (Burke 1997). Organic materials, which can be degraded rapidly, are digested in the contact reactor. The bacteria and slowly degradable organics are removed and degraded in a highly concentrated reactor. Figure 11– Contact Stabilization Reactor Phased Digesters Both acid phased and temperature phased digestion have been used to convert municipal sludge to gas. Acid phased digestion (Ghosh 1987) takes advantage of the fact that the acid forming bacteria have a much higher growth rate than the methanogens. Consequently, the initial reactor can be much smaller than the subsequent methane producing digester. Acid phased digestion offers greater efficiency in the size of the anaerobic digesters. Acid phased digestion has not been applied to dairy waste. Temperature phased digestion has been applied to the digestion of sewage sludge. The initial digester is operated in the thermophilic mode followed by a second digester, which is operated in the mesophilic mode. In the first thermophilic digester, pathogens are destroyed. In the second mesophilic digester, the mesophilic bacteria consume the organic acids created in the thermophilic reactor. Consequently, the odors associated with a thermophilic effluent are eliminated while achieving the desired pathogen destruction. © Environmental Energy Company 33 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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