Biogas Jeff Hoover Potential Gas Supply Biogas is
Biogas Jeff Hoover
Potential Gas Supply § Biogas is derived from anaerobic (in lack of oxygen) digestion of biomaterial. § Primarily used in engine-generators and heat generation § May be upgraded to biomethane, equivalent form to Natural Gas.
Source § Dairies § Cow manure § California § 3. 6 million bone dry tons (BDT) (zero-moisture content) of manure
Harvesting Source § Flushed freestall § Hosed and piped off § § § Scraped freestall Dry lot w/ flushed freestall Scraped dry lot (85 -90%)
Other sources § § § Slaughterhouse waste material Hog, turkey/poultry manure Crop Residues Food Processing Wastes Landfill food, green, composite organic waste.
Digestion plants § Ambient-temperature Covered Lagoon § Not temperature controlled, thin waste § Low tech, cheapest § 40 day retention time § Complete mix § Heated, thicker waste § 15+ day retention time § Plug Flow § Thicker waste § 15+ day retention time
Digestion types § Thermophilic § Optimal for quickest production § 125 -135°F § Mesophilic § 95 -105°F
Conclusion, Output § “Technical Potential” of Methane production § 23 billion cubic feet per year § 220 MWe § Total statewide demand of NG = 2, 200 billion cubic feet per year § 23 billion cft/yr equates to ~1% of NG demand
Questions? § Does this biogas appear to be a useful way of producing heat/electricity/vehicle transportation? § Why or why not? § What drawbacks can be seen from these observations?
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