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The primary use of digestate is as a soil conditioner. [5] Acidogenic digestate provides moisture retention and organic content for soils. This organic material can break down further, aerobically in soil. Methanogenic digestate provides nutrients for plant growth. It can also be used to protect soils against erosion.
Digestate typically contains elements, such as lignin, that cannot be broken down by the anaerobic microorganisms. Also, the digestate may contain ammonia that is phytotoxic, and may hamper the growth of plants if it is used as a soil-improving material. For these two reasons, a maturation or composting stage may be employed after digestion.
The following article is a comparison of aerobic and anaerobic digestion.In both aerobic and anaerobic systems the growing and reproducing microorganisms within them require a source of elemental oxygen to survive.
The digestate is the remaining inorganic matter that was not transformed into biogas. It can be used as an agricultural fertiliser. Biogas can be used as the fuel in the system of producing biogas from agricultural wastes and co-generating heat and electricity in a combined heat and power ( CHP ) plant.
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Humus is also produced as a byproduct of natural gas production. Humus, alternatively known as digestate, is a value-added lignin- and nutrient-rich soil amendment similar to peat moss or compost which may be returned to feedstock suppliers or further processed into marketable products.