Fenton-conditioning of landfill leachate biological sludge enables biochar for efficient Cr(â
¥)removal: Occurrence of oxygen-centered free radicals.
J Environ Manage
; 367: 122070, 2024 Sep.
Article
in En
| MEDLINE
| ID: mdl-39098068
ABSTRACT
Fenton-conditioning is commonly used to improve dewatering ability for municipal biological sludge, however, its application in industries is scarce. In this study, biochar (FT-BC) was successfully synthesized from a Fenton-conditioned landfill leachate biological sludge under oxygen-limited. As compared to the corresponding blank and poly ferric-pretreated biochars (BC and PF-BC), moderate Fenton conditioning of the sludge could enable good removal performance for Cr (â
¥) by FT-BC. It was found that the oxygen central free radicals (OCFRs) on the biochar surface was intensively promoted due to Fenton electrophilic addition of ·OH onto the oxygen-containing functional groups in biomass. The amounts of OCFRs correlated positively well with the removal efficiency, indicating these persistent free radicals (PFRs)would mainly responsible for the reductive immobilization of Cr(VI)on the FT-BC surface. This study is expected to provide a new method for reclamation of industrial biological sludges with poor agglomeration by introducing simple Fenton pre-conditioning.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sewage
/
Charcoal
Language:
En
Journal:
J Environ Manage
Year:
2024
Document type:
Article
Country of publication:
United kingdom