Effect of Pyrolysis Treatment on Phosphorus Migration and Transformation of Pig, Cow and Sheep Manure

Fen Liu, Zhihua Xiao (), Jun Fang () and Hao Li
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Fen Liu: Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Hunan Agricultural University, Changsha 410128, China
Zhihua Xiao: Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, China
Jun Fang: Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Hunan Agricultural University, Changsha 410128, China
Hao Li: Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Hunan Agricultural University, Changsha 410128, China

Sustainability, 2023, vol. 15, issue 12, 1-14

Abstract: Pig, cow, and sheep manure (PM, CM, and SM) are inevitable byproducts of agricultural economic development. Converting them into high add-on value biochar (PMB, CMB, and SMB) via pyrolysis is an efficient resource utilization measure. Phosphorus (P) speciation analyses help ensure the practical feasibility of the P reclamation of animal manure and their derived biochar and a reduction in environmental risk. This study conducted a modified extraction procedure to separate five inorganic P (IP) (soluble and loosely bound IP, aluminum-bound IP, Fe-bound IP, oxide-occluded IP, and Ca-bound IP) and organic P (OP) speciations, and combined X-ray diffraction (XRD) to investigate the major phosphate compound in the derived biochar after pyrolysis. Results revealed that more than 92% of P is concentrated in the derived biochar during pyrolysis processes carried out at 200–800 °C. The percentages of soluble and loosely bound IP, aluminum-bound IP, and OP in manure decreased significantly due to their transformation into more stable P fractions such as Ca-bound IP (79.01% in PMB, 800 °C) after pyrolysis. The Olsen-P percentages had a distinct reduction at 650 °C, indicating that pyrolysis at 650 °C was the optimal condition for the reduction in Olsen-P in manure.

Keywords: phosphorus; speciation; derived biochar; XRD; pyrolysis; manure (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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