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=== Pre-treatment === | === Pre-treatment === | ||
Depending on the type of feedstock and its purity, specific pre-treatment technologies are required to provide fermentable substrates to the microorganisms. Generally, this involves a [[Sizing|size reduction]] step, after which the milled biomass can be processed to separate the desired substrate by e.g., [[centrifugation]], filtration, evaporation or crystallization. | Depending on the type of feedstock and its purity, specific pre-treatment technologies are required to provide fermentable substrates to the microorganisms. Generally, this involves a [[Sizing|size reduction]] step, after which the milled biomass can be processed to separate the desired substrate by e.g., [[centrifugation]], filtration, evaporation or [[Crystallisation and precipitation|crystallization]]. | ||
In addition, it should be taken into account that some of the above mentioned feedstocks only provide the carbon source (which compose about 50% of the weight of most microorganisms), in that case also other nutrients such as nitrogen, phosphate and potassium need to be added. | In addition, it should be taken into account that some of the above mentioned feedstocks only provide the carbon source (which compose about 50% of the weight of most microorganisms), in that case also other nutrients such as nitrogen, phosphate and potassium need to be added. |