Residues from Biogas Production
During anaerobic digestion, nutrients contained in the organic matter are conserved and mineralized to more soluble and biologically available forms, providing a more predictable biofertilizer. By recycling the treated effluents back to productive agricultural lands, at appropriate rates, the crops benefit from the presence of these important plant nutrients. Where insufficient cropland is available, other nutrient recovery technologies may be employed to reduce the nutrient content of the digested wastewater.
Three Common Biogas Residues
Microbial solids (sludge), Fiber, & Wastewater
Resources
Bench-scale recovery of phosphorus from
flushed dairy manure wastewater. Bioresource Technology, 99(8):3036-3043 (2008). [PDF]
Nutrient removal by floating aquatic
macrophytes cultured in anaerobically digested flushed dairy manure
wastewater. Ecological Engineering, 22(1):27-42 (2004). [PDF]
Recovery of diary manure nutrients by
benthic freshwater algae. Bioresource Technology, 84(1):81-91 (2002). [PDF]
Cyanobacterial process for renovating dairy
wastewater. Biomass and Bioenergy, 10(1):63-68 (1996). [PDF]