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Table 5 Summary of Process Attributes Not Limited by Solids Concentration X X X Not Limited by Foreign Material X X X Digest Entire Dairy Waste Stream X X X Sand & Floating Solids Processing X X X Best at Odor Control X X Concentrate Nutrients in Solids Treat Additional Substrate X X X Attribute X X Stability Simplicity Flexibility Net Energy Production X XXX XX X X X X Cost of Anaerobic Processes for Dairy Waste The cost of a dairy waste management system can be subdivided into the following elements: • Housing – Determines the percentage of manure actually collected • Collection – A means of collecting the waste by manual, or automatic scraper, vacuum truck, or flush. • Pre-processing – Screening and or sedimentation prior to digestion • Anaerobic Digestion – The solids conversion process • Post-processing – The concentration of solids after digestion • Energy Production – Engine Generator or Turbine with heat recovery • Liquid Handling & Irrigation – The storage and disposal of liquid waste • Solids Disposal As pointed out earlier, use of any particular system will have an effect on the other. For example, if a flush system is used the anaerobic digester must be larger. If pre screening and sedimentation are used, the amount of energy produced will be lower. Post processing will establish the cost of ultimate solids disposal. In many cases, solids must be exported from the site. The use of an © Environmental Energy Company 42 www.makingenergy.com 360-923-2000 Complete mix – mesophilic Complete mix – thermo Contact – Mesophilic Plug Flow Mesophilic Lagoon Fixed FilmPDF Image | Dairy Waste Anaerobic Digestion Handbook Options for Recovering Beneficial Products From Dairy Manure
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