![]() ![]() Compilation of the latest knowledge in the industry on best practices for AD/ biogas systems. Describes the elements of a biogas and digestate recovery system. Presents the many benefits of AD compared to traditional manure management systems. Digestate products can be a source of revenue or cost savings, and are often pursued to increase the financial and net-environmental benefit of an AD/biogas project. With appropriate treatment, both the solid and liquid portions of digestate can be used in many beneficial applications, such as animal bedding (solids), nutrient-rich fertilizer (liquids and solids), a foundation material for bio-based products (e.g., bioplastics), organic-rich compost (solids), and/or simply as soil amendment (solids), the latter of which may include the farm spreading the digestate on the field as fertilizer. These are often separated and handled independently, as each have value that can be realized with varying degrees of post processing. It is composed of liquid and solid portions. Digestateĭigestate is the residual material left after the digestion process. This can be sold and injected into the natural gas distribution system, compressed and used as vehicle fuel, or processed further to generate alternative transportation fuel, energy products, or other advanced biochemicals and bioproducts. Biogas can also be purified by removing the inert or low-value constituents (CO2, water, H2S, etc.) to generate renewable natural gas (RNG). The energy in biogas can be used like natural gas to provide heat, generate electricity, and power cooling systems, among other uses. Biogasīiogas is composed of methane (CH4), which is the primary component of natural gas, at a relatively high percentage (50 to 75 percent), carbon dioxide (CO2), hydrogen sulfide (H2S), water vapor, and trace amounts of other gases. The following figure illustrates the flow of feedstocks through the AD system to produce biogas and digestate.Īnaerobic digestion produces two valuable outputs: biogas and digestate. Co-digestion can increase biogas production from low-yielding or difficult-to-digest organic waste. Co-digested materials include manure food waste (i.e., processing, distribution and consumer generated materials) energy crops crop residues and fats, oils, and greases (FOG) from restaurant grease traps, and many other sources. Multiple organic materials can be combined in one digester, a practice called co-digestion. These reactors contain complex microbial communities that break down (or digest) the waste and produce resultant biogas and digestate (the solid and liquid material end-products of the AD process) which is discharged from the digester. Anaerobic digestion for biogas production takes place in a sealed vessel called a reactor, which is designed and constructed in various shapes and sizes specific to the site and feedstock conditions ( learn more about AD system design and technology). Anaerobic digestion is a process through which bacteria break down organic matter-such as animal manure, wastewater biosolids, and food wastes-in the absence of oxygen. ![]()
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