By-products of anaerobic treatment: methane and digestate from manures and cosubstrates
Anaerobic digestion is a widely used and probably the most sustainable technique for biogas production and nutrient recovery from manure. This chapter describes the process of anaerobic digestion of manure and other cosubstrates with a specific focus on biogas and digestate utilization. Biogas purification is one of the most significant bottlenecks to fully realizing the range of biogas utilization for not just energy production but also other forms of beneficial usages. Thus, biogas purification techniques are discussed in detail in this chapter. Digestate from manure is an excellent biofertilizer and can be applied using the same equipment designed for liquid fertilizer. Previous studies corroborated in this chapter highlight the importance of quality control and digestate application practice particularly when manure is codigested with other cosubstrates or the digestate is used on a different farm.