By California Integrated Waste Management Board (CIWMB)
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Additional info for Current anaerobic digestion technologies used for the treatment of municipal organic solid waste [Electronic resource]: contractor's report to The Board
In theory, batch loading simplifies material handling, and because the hydrolysis reactors are high-solids digesters, they can handle relatively large inorganic contaminants. Leachate recirculation prevents solids from fouling the wet methanogenesis reactor. Because the batches are phased, the leachate contains a relatively constant concentration of organic acids. Figure 23. Schematic diagram of the APS Digester system. A pilot demonstration plant for the APS Digester system with a capacity of about 1-2 tons (dry) per day of organic waste has been under development at the University of California, Davis (Figure 24 and Figure 25).
Feed is introduced into the top of the reactor and moves downward to the conical bottom where an auger removes digestate. A fraction of the digestate is transferred to the mixing pump where it is blended with fresh feed to inoculate the material and steam to bring the feed to the working temperature. The rest of the digestate is dewatered to produce process water and press cake. There is no mixing within the reactor, other than that brought about by the downward, plug-flow movement of the waste and some biogenic gas that bubbles upwards.
Nonetheless, there will likely be material handling and processing difficulties with any system that processes MSW. Contractor’s Report to the Board 41 In the 1980s the Gas Technology Institute, University of Florida, and Walt Disney World experimented with a novel digester design that was “non-mixed and employed passive settling and flotation to concentrate solids” . Called SOLCON (for “solids-concentrating”), the system achieved a solids retention time (SRT) that was about three times longer than the HRT which increased overall solids conversion compared to that of a complete-mix digester [76-78].
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)