Dry fermentation : 1.Organic input remains stationary throughout process, eliminating moving parts and resulting in low system maintenance and repair costs 2. Batch process and stationary system allow precise control over input removal ensuring maximum energy yield Closed loop liquid cycle following start-up, eliminating post-process waste water treatment needs 3. No pre-treatment or sorting of inputs required prior to system loading, saving time and money for system operators 4. Almost no limitations to inputs—over 3,000 inputs have been identified and researched BIOFerm system has low energy consumption, using only 5% of the energy generated for plant operation
Wet fermentation 1. System requires mechanical parts to circulate biomass in liquid holding tank, leading to increased maintenance and repair costs 2. Liquid mixture causes premature removal of input before all organic matter has been digested, resulting in a loss of energy 3. System requires additional liquid to allow fermentation, greatly increasing the amount of system waste water and costly post-process treatments 4. Inputs require pre-treatment to prevent breakdown of mechanical parts as input is agitated and moved through system Input limited to “wet” waste streams .