Difference between revisions of "Anaerobic digestion"

Anaerobic digestion (view source)

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 === Pre-treatment ===
+For residual flows from the food industry, crop residues and manure, thermal and chemical pre-treatments are mainly applied.  The most important effects of thermal pre-treatment are: reducing particle size, increasing solubility and improve the biodegradability.  Additional advantages of thermal pre-treatment are: (1) higher loading of the digester is possible, (2) lower viscosity of the treated material which results in lower energy input for mixing the digester, (3) improved dewaterability of digestate and (4) sanitised product.
+Biomass is separated from impurities as stones and glass.  An agitator provides a good mixing between different biomass types to avoid strong changes in composition.  The feed is a stirrable mixture and the dry matter content may be a maximum of 15-20% of the slurry.  Co-substrates are often reduced in size by shredding before they are fed in order to make the contact surface of the biomass as large as possible.
 == Process and technologies ==