Speciation and environmental risk of heavy metals in biochars produced by pyrolysis of chicken manure and water-washed swine manure

This study was conducted to investigate the speciation, bioavailability and environmental risk of heavy metals (HMs) in chicken manure (CM) and water-washed swine manure (WSM) and their biochars produced at different pyrolysis temperatures (200 to 800 °C). As the pyrolysis temperature increased, the...

Full description

Saved in:
Bibliographic Details
Published in:Scientific reports 2021-06, Vol.11 (1), p.11994-14, Article 11994
Main Authors: Wang, Andong, Zou, Dongsheng, Zeng, Xinyi, Chen, Bin, Zheng, Xiaochen, Li, Longcheng, Zhang, Liqing, Xiao, Zhihua, Wang, Hua
Format: Article
Language:English
Subjects:
704/172/169
704/172/4081
Bioavailability
Charcoal
Chickens
Environmental risk
Heavy metals
Humanities and Social Sciences
Leaching
Manures
multidisciplinary
Pig manure
Poultry manure
Pyrolysis
Risk assessment
Science
Science (multidisciplinary)
Speciation
Swine
Temperature
Toxicity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study was conducted to investigate the speciation, bioavailability and environmental risk of heavy metals (HMs) in chicken manure (CM) and water-washed swine manure (WSM) and their biochars produced at different pyrolysis temperatures (200 to 800 °C). As the pyrolysis temperature increased, the remaining proportion, toxicity characteristic leaching procedure (TCLP), HCl and diethylenetriamine pentaacetic acid (DTPA) of HMs gradually declined. This result proved that the speciation of HMs in chicken manure biochars (CMB) and water-washed swine manure biochars (WSMB) was influenced by pyrolysis temperature. The proportions of stable fractions were enhanced with increased pyrolysis temperature and weakened the HM validity for vegetation at 800 °C. Finally, the results of the risk assessment showed that the environmental risk of HMs in CMB and WSMB decreased with increasing pyrolysis temperature. Therefore, pyrolysis at 800 °C can provide a practical approach to lessen the initial and underlying heavy metal toxicity of CMB and WSMB to the environment.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-91440-8