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Hybrid Processes A number of hybrid processes have been developed and applied to many different kinds of waste materials. The hybrid processes incorporate a combination of the previously described configurations. Qualitative Analysis of Anaerobic Processes In order to assess the various digester configurations one must define their limitations for dairy waste digestion. The following pages describe the attributes as well as the limitations of each digester configuration. Solids Concentration Limitations The ability to process a variety of manure concentrations is important. Even though the solids may be collected in a concentrated form, there will be times when the solids become diluted. The inverse is also true. The dilute parlor waste may become concentrated for variety of reasons. The mesophilic and thermophilic completely mixed processes and the contact process can handle a variety of influent manure concentrations. Their operating performance is not limited by the manure concentration. On the other hand the plug flow digester and the anaerobic lagoon are limited by the influent manure concentration. The plug flow digester will stratify at low feed concentrations. The anaerobic lagoon will accumulate non-degraded solids at high influent solids concentrations. Digestion of the Entire Waste Stream The thermophilic and mesophilic completely mixed reactors and the plug flow contact process can digest the entire waste stream since neither are limited by the concentration of the influent waste. Plug flow reactors will be able to process the concentrated or scraped manure. Plug flow reactors will not be able to economically process the parlor waste or a mixture of the parlor and scraped waste. The anaerobic lagoon can process primarily liquid waste after the removal of fibers and particulate solids. The current practice of screening fibers and settling solids to remove particulate matter is not compatible with achieving high energy yields through anaerobic digestion. It is generally accepted that screening will remove at lease 15% of the influent COD. Recent analysis has shown that screening and sedimentation will remove 60% or more of the COD that could be converted to gas. Solids separation should follow, rather than precede anaerobic digestion. © Environmental Energy Company 35 www.makingenergy.com 360-923-2000PDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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