Influence of anaerobic digestion on the labile phosphorus in pig, chicken, and dairy manure

Bowen Li; Konstantin Dinkler; Nan Zhao; Mostafa Sobhi; Wolfgang Merkle; Shan Liu; Renjie Dong; Hans Oechsner; Jianbin Guo

doi:10.1016/j.scitotenv.2020.140234

Influence of anaerobic digestion on the labile phosphorus in pig, chicken, and dairy manure

Sci Total Environ. 2020 Oct 1:737:140234. doi: 10.1016/j.scitotenv.2020.140234. Epub 2020 Jun 17.

Authors

Bowen Li¹, Konstantin Dinkler¹, Nan Zhao², Mostafa Sobhi², Wolfgang Merkle³, Shan Liu⁴, Renjie Dong², Hans Oechsner³, Jianbin Guo⁵

Affiliations

¹ Key Laboratory of Clean Utilization Technology for Renewable Energy, Ministry of Agriculture, Department of Agricultural Engineering, China Agricultural University, Beijing 100083, People's Republic of China; The State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Stuttgart 70593, Germany.
² Key Laboratory of Clean Utilization Technology for Renewable Energy, Ministry of Agriculture, Department of Agricultural Engineering, China Agricultural University, Beijing 100083, People's Republic of China.
³ The State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, Stuttgart 70593, Germany.
⁴ Key Laboratory of Clean Utilization Technology for Renewable Energy, Ministry of Agriculture, Department of Agricultural Engineering, China Agricultural University, Beijing 100083, People's Republic of China; Key Laboratory of Technology and Model for Cyclic Utilization from Agricultural Resources, Ministry of Agriculture and Rural, Beijing 100125, People's Republic of China.
⁵ Key Laboratory of Clean Utilization Technology for Renewable Energy, Ministry of Agriculture, Department of Agricultural Engineering, China Agricultural University, Beijing 100083, People's Republic of China. Electronic address: jianbinguo@cau.edu.cn.

PMID: 32783845
DOI: 10.1016/j.scitotenv.2020.140234

Abstract

Phosphorus (P) loss from livestock and poultry industry causes serious threat to agro-ecological environments. Anaerobic digestion (AD), through recycling of P-containing resources and biogas production, prevails as a promising solution to the resource, energy, and environment trilemma. In this study, the dynamic transformation of P in batch AD processes fed with chicken, pig and dairy manures was investigated. Results showed that the Labile-P of total phosphorus (TP) in pig, chicken and dairy manure digestates decreased from 37.35% to 23.79%, 36.79% to 17.29%, and 60.47% to 20.39%, respectively, and was associated with an increase of NaOH-P during the AD process. However, the Labile-P in raw manures ranging from 64.67% to 81.10%, indicated that AD could reduce the pollution risk caused by the overuse of high Labile-P animal manure as fertilizer. Metal ions had a significant influence on P transformation because of their ability to combine with PO₄^3-/HPO₄^2-. During AD, the species of phosphates increased: AlPO₄, FePO₄, Mg₃(PO₄)₂, CaHPO₄, Mg(NH₄)PO₄·6H₂O and Ca₁₀(PO₄)₆(OH)₂ were the main phosphates qualified by X-ray diffraction (XRD). AD produced a satisfactory fertilizer for plants that were able to activate the precipitated P, which could provide readily available N and slow-release P. This study provides a meaningful theoretical guide for recycling P from animal manure resources.

Keywords: AD; Animal manure management; Fertilizer; P; Transformation mechanism.

MeSH terms

Anaerobiosis
Animals
Biofuels
Chickens
Manure*
Phosphorus*
Swine

Substances

Biofuels
Manure
Phosphorus