Abstract
Advanced oxidation processes (AOPs) have promising applications in wastewater treatment. Metal-containing sludge-based biochar (BC), with the advantages of abundant biomass resources, has received increasing attention as an AOP catalyst. In this study, biochar was used as a catalyst for peroxymonosulfate (PMS) activation and hydrogen peroxide catalyzing in combination with light illumination for organic wastewater degradation. Iron-containing sludge-based biochar (5%FeBC, 10%FeBC and 20%FeBC) was prepared using excess sludge doped with different amounts of Fe(III) by anaerobic carbonization process with partial reduction of Fe(III) to Fe(II). X-ray photoelectron spectroscopy (XPS) spectra showed that most of the Fe in BC existed in the form of Fe(II), with Fe(II) proportion of 61.53 % and Fe(III) of 38.47 %. For PMS activation under light illumination, 5%FeBC prepared at 900 °C showed 98 % removal efficiency of tetracycline (TC). The TC removal efficiency of 98 % was obtained under the condition of H2O2 combined with light illumination by 20 % FeBC prepared at 900 °C. The reactive substances included sulfate radicals (·SO4−), hydroxyl radicals ([rad]OH) and singlet oxygen (1O2) in the PMS activation system, which contained [rad]OH and 1O2 in the H2O2 system. The 5%FeBC-900 in PMS system and the 20%FeBC-900 in H2O2 system can effectively remove organic matter and proteins from pharmaceutical wastewater.
Original language | English |
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Article number | 104833 |
Journal | Journal of Water Process Engineering |
Volume | 58 |
DOIs | |
Publication status | Published - Feb 2024 |
Keywords
- Advanced oxidation processes
- Iron-containing biochar
- Pharmaceutical wastewater
- Reactive oxygen species
- Tetracycline
ASJC Scopus subject areas
- Biotechnology
- Safety, Risk, Reliability and Quality
- Waste Management and Disposal
- Process Chemistry and Technology