BIOFerm - Dry Fermentation System
The BIOFerm system is a batch type system that uses the principle of dry fermentation anaerobic digestion in the mesophillic temperature range. The BIOFerm dry fermentation process is well suited for solid waste materials that have a solids content of 25-35%.
BIOFerm plants consist of multiple concrete garage...
BIOFerm plants consist of multiple concrete garage style fermenters that can be sealed gas-tight. Biomass is loaded into these chambers by a front-end loader and remains in the chamber for an average of 28 days. Heat is delivered to the fermenters through in-wall radiant heat and through the percolate, which is sprayed onto the biomass through over-head sprinklers. Percolate also acts as an inoculum source since it contains the appropriate anaerobic digestion bacteria. Biomass remains stationary but the percolate and water produced during the digestion process are continuously captured through floor drains and re-circulated. The biogas that is produced by the anaerobic digestion process is collected into a flexible gas storage bag from where it is continuously fed to the biogas utilization source. Biogas is either used in a combined heat power unit that generates electricity and heat or it can be upgraded to pipeline quality natural gas.
Advantages of BIOFerm Dry Fermentation
The BIOFerm Dry Fermentation System is well suited to process municipal organic waste including yard waste and integrates well into a composting operation. It is virtually immune to physical contaminants as the input material remains stationary and does not come into contact with any moving equipment inside the fermentation chamber.
The batch style process is inherently more stable than a continuously fed complete mix system. If the bacteria in one fermentation chamber are out of balance/underperforming, it is less devastating to the system as a whole than other anaerobic digestion systems and the affected chamber can be quickly remediated by exchanging the substrate.
Safety and Plant Monitoring
BIOFerm biogas plants are constructed with the highest degree of safety in mind. Standard safety installments include: fire and explosion protection, pollution control, ventilation, biofilters, noise prevention, ground water certification, and lightning deterrents.
All functions of the plant are monitored through the automated plant control system. The software continuously keeps a log of all data points and displays an easy-to-read plant schematic. This allows the operator to oversee the plant operation, biogas production and possible malfunctions.
Continuous monitoring of conditions inside each fermenter is an integral safety measure. By checking and evaluating aspects such as methane, carbon dioxide and hydrogen sulfide levels, a plant operator is instantly alerted if a problem arises. Plants can be shut down via automated controls so that any irregularity can be fixed.
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