Crop Straw is a generic term for the stems and leaves of a mature crop, usually referred to as the remainder of wheat, corn, potato, rape, peanut, soybean and other crops (usually coarse grains) after harvesting the seed.
Energy grass are the perennial tall herbs or semi-shrubs, such as Pennisetum, giant grass, Arundo donax, switchgrass, mango crops,etc.
Crop straw and energy grass are rich in organic matter, whose majority is composed of lignin, cellulose and hemicellulose that can not be easily decomposed. Special technology and long time required in the hydrolysis process, so it is recommended to choose raw biomass that are soft and fresh with low lignin and high sugar contents.
As these biomass has low ammonia and phosphorus content, not good for microbial metabolic activity, increasing the difficulty of biological decomposition. In practice, it is recommended to mix with human or animal manure to improve biogas production if wet type fermentation is adopted.
Due to high solids content in some special biomass, it is also suitable for dry type fermentation, or a combination of dry type hydrolysis process and wet type methane formation.
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