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By California Integrated Waste Management Board (CIWMB)

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Extra resources for Current anaerobic digestion technologies used for the treatment of municipal organic solid waste [Electronic resource]: contractor's report to The Board

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Each reactor is a separate single-stage digester. This may be done because of tank size limitations, to simplify management, or to expand capacity of an existing plant. A true multi-stage digester applies different conditions to the reactors in each stage. The difference can be in the OLR of each stage, the presence or absence of oxygen, the introduction of an intermediate treatment, or the overall reactor configuration. Many different combinations of factors are possible. Figure 16 depicts a generic two-stage AD system with hydrolysis occurring in a high-solids first stage and methanogenesis occurring in the low-solids second stage (dry-wet configuration).

Material enters at the bottom on one side of the inner wall and must flow around the wall before it can exit [49]. The retention time is on the order of three weeks. Biogas is injected in the base of the reactor and the bubbles serve as a means for mixing and keeping solids suspended. The digestate is dewatered and typically composted. Table 3 lists existing Valorga facilities. With 21 operating facilities as of 2008 (assuming the plants under construction in 2007 are currently operational see Table 3), the Valorga system is a robust and popular one-stage dry system.

Many different combinations of factors are possible. Figure 16 depicts a generic two-stage AD system with hydrolysis occurring in a high-solids first stage and methanogenesis occurring in the low-solids second stage (dry-wet configuration). In other systems, such as the Scharting-Uhde process, both stages are low-solids (wet-wet configuration) [35]. Contractor’s Report to the Board 27 Figure 16. Schematic of a generalized two-stage anaerobic digestion system As mentioned earlier, there are relatively few commercial, operational multi-stage AD units.

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Current anaerobic digestion technologies used for the treatment of municipal organic solid waste [Electronic resource]: contractor's report to The Board by California Integrated Waste Management Board (CIWMB)


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