Boigas from Dairy Manure, Straw and Corn Stover
There are some 1,8 million dairy cows in California alone that drop some 100,000 tons of manure each day. California dairies predominantly use a wet flushing approach from the feeding stalls to a lagoon, from where the methane gas evaporates causing a magnitude more damage to atmosphere than carbon dioxide. The groundwater gets contaminated if the lagoon is not properly lined.
Unfortunately, the handful Government supported biogas plants in California have not been successful for reasons of poor planning, technology choices, permitting hurdles and circumvention.
BIOGAS Equity 2 believes that the wet UDR process it represents lends itself to help dairies to convert a large portion of the daily excreted manure to renewable energy while reducing odor, air and ground water contamination and produce fertilizer and bedding material.
We have co founded the Bioenergy Association of California and are working with the Sacramento agencies to find ways to streamline the permitting process and believe that a standardized system using our patented UDR technology will be effective for dairies and blessed by the EPA and Air Resources Board and other agencies.
The represented UDR process is most efficient at 8 to 15% solid feedstock. As most flushed dairy systems yield 2 to 4% solids, we desire to thicken the slurry with organic feedstock that can be locally grown rather than pressing out the liquid that still contains energy and purge it into the lagoon. Dairies with scraped or vacuumed manure collection processes are an ideal target as it can be pumped directly into the digester.
Our goal is to install many UDR biogas plants by providing financing and operating expertise. BIOGAS Equity 2 desires to own the plant and minimize the dairy’s risk. The design allows for the plant to be moved in order to provide for maximum flexibility and asset security.
Our initial focus is on large dairies, 5,000 milk cows and up. For several small dairies in close proximity it might be practical to piping the slurry to a central plant. If two or three large dairies are close and natural gas pipelines run near by, it will be practical to upgrade the biogas to biomethane for pipeline insertion and clean burning vehicle fuel. It is also possible to feed gained electricity from several plants to a large power user without requiring a feed in agreement from a utility.
For small dairies with 300 to 400 milking cows we now offer the MonoTube that combines all three UDR tanks in one 4m diameter by 10m high tank and 65 to 85kW CHP to cover the dairy’s power use.
Besides offering dairies an alternate revenue source by converting manure to energy, the resulting digestate offers two advantages: odorless and clean bedding and an organic fertilizer that is better absorbed by plants than raw manure or chemical fertilizer.