Answers · Technology
How does anaerobic digestion turn organic waste into useful products?
Short answer
Microorganisms break down suitable organic material without oxygen. The process yields biogas and digestate, a wet residual containing organic material and nutrients.
Check the feedstock contract
Feedstock can include manure, food waste, wastewater solids, and other organics. Material contamination, preparation, and the mix of feedstocks influence what a specific digester can take.
Plan for both products
Biogas can be used on site for heat or power, or upgraded to renewable natural gas. Digestate needs a destination that fits its quality, treatment, and applicable rules. Check both outlets before sizing the project.
Sources
- U.S. EPA · Basic information about anaerobic digestion
- U.S. EPA AgSTAR · Anaerobic digester project development handbook
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