The efficiency and mechanism of excess sludge-based biochar catalyst in catalytic ozonation of landfill leachate

Jingyao Zhang, Jiadong Liu, Bo Gao, Mika Sillanpää, Jin Han

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

In this study, biochar was produced based on dehydrated excess sludge from the municipal wastewater treatment plant, which was used for catalytic ozonation of pollutants derived from landfill leachate. The necessary catalytic sites in the structure of biochar were originated from the inorganic metals and organic matters in the sludge, which included a large number of functional groups (e.g., C-C, C[dbnd]O, etc.), adsorbed oxygen (Oads accounted for 44.82%) and electron defects (ID/IG=1.01). These active sites could promote the generation of reactive oxygen species (ROS) (e.g., ·OH,·O2-, etc.). The synergistic interaction between the microorganisms in the activated sludge also facilitated the removal rates of pollutants. Proteobacteria, Bacteroidetes, and Deinococcu-Thermus were crucial in the bioreactor. In 16 days of reaction, the removal ratios of NH+4-N and COD were 98.95 ± 0.11% and 90.89 ± 0.47%, respectively. This study not only explains the mechanism of catalytic ozonation of biochar, but also provides a new way of the practical treatment of landfill leachate.

Original languageEnglish
Article number132118
JournalJournal of Hazardous Materials
Volume459
DOIs
Publication statusPublished - 5 Oct 2023
Externally publishedYes

Keywords

  • Catalytic ozonation
  • Excess sludge-based biochar
  • Functional group
  • Microorganisms
  • Reactive oxygen species

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Fingerprint

Dive into the research topics of 'The efficiency and mechanism of excess sludge-based biochar catalyst in catalytic ozonation of landfill leachate'. Together they form a unique fingerprint.

Cite this