Migration of phosphorus in pig manure during pyrolysis process and slow-release mechanism of biochar in hydroponic application.
Sci Total Environ
; 915: 170116, 2024 Mar 10.
Article
in En
| MEDLINE
| ID: mdl-38232831
ABSTRACT
Pyrolysis is an effective method for treating of livestock and poultry manure developed in recent years. It can completely decompose pathogens and antibiotics, stabilize heavy metals, and enrich phosphorus (P) in biochar. To elucidate the P migration mechanism under different pig manure pyrolysis temperatures, sequential fractionation, solution 31P nuclear magnetic resonance, X-ray photoelectron spectroscopy, X-ray diffraction, and K-edge X-ray absorption near-edge structure techniques were used to analyze the P species in pig manure biochar (PMB). The results indicated that most of the organic P in the pig manure was converted to inorganic P during pyrolysis. Moreover, the transformation to different P groups pathways was clarified. The phase transition from amorphous to crystalline calcium phosphate was promoted when the temperature was above 600 °C. The content of P extracted by hydrochloric acid, which was the long-term available P for plant uptake, increased significantly. PMB pyrolyzed at 600 °C can be used as a highly effective substitute for P source. It provides the necessary P species (e.g. water-soluble P.) and metal elements for the growth of water spinach plants, and which are slow-release comparing with the Hogland nutrient solution.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pyrolysis
/
Manure
Limits:
Animals
Language:
En
Journal:
Sci Total Environ
Year:
2024
Type:
Article
Affiliation country:
China