Assessing changes to nutrient density and availability following separation, drying, and pyrolysis of manure solids. (September 2022)

• Record Type: Journal Article
• Authors: Sanford, Joseph R.; Johnstone, Daniel; Larson, Rebecca A.
• Is Part Of: Bioresource technology reports. Volume 19(2022)
• Publication Date: 2022-09
• Subjects: Biochar -- Livestock manure -- Phosphorus -- Nitrogen -- Nutrient availability; Biomass energy -- Periodicals; Biotransformation (Metabolism) -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Waste products as fuel -- Periodicals; Waste products as fuel; Organic wastes; Factory and trade waste; Biotransformation (Metabolism); Biomass energy; Agricultural wastes; Periodicals; Electronic journals; 662.88
• DOI: 10.1016/j.biteb.2022.101169
• Languages: English
• ISSNs: 2589-014X

Abstract

Abstract: Manure nutrients are beneficial when land applied but contribute to environmental degradation when lost as runoff or emissions. Applying manure nutrients to better meet agronomic crop needs has potential to reduce losses. However, transporting manure nutrients to nutrient deficient fields is commonly cost prohibitive. Densifying manure nutrients has the potential to reduce costs. Manure processing of separated manure solids via drying at 50 °C for 48 h reduced the mass by 62.8 %, where reduction by pyrolysis reduced the mass by 81.8 % and 83.4 % at 350 and 500 °C, respectively. Drying and pyrolysis retained and densified the manure phosphorus. Drying retained the nitrogen within the solids, but 37 to 47 % of nitrogen was lost through pyrolysis. Immediately after processing, available phosphorus decreased with increasing pyrolysis temperature. Incubation of manure solids and processed manures shows that processing decreased available phosphorus through the first 28 days, but following that initial period reached similar phosphorus availability. Graphical abstract: Unlabelled Image Highlights: Converting manure solids to biochar retains phosphorus through pyrolysis process. Manure derived biochar has less available phosphorus than raw manure solids. After 28 days, soil available phosphorus was similar in all incubation treatments.