Journal
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
Volume 7, Issue 3, Pages 638-649Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ew00763c
Keywords
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Funding
- South East Water
- Intelligent Water Networks (IWN)
- RMIT University
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The study found that the semi-pilot fluidised bed pyrolysis unit can effectively convert biosolids into biochar and the biochar derived from biosolids has high adsorption capacity for PFASs in contaminated water, especially for long-chain PFASs.
This study focuses on the conversion of biosolids to biochar and its further use in adsorbing per- and polyfluoroalkyl substances (PFASs) from contaminated water. In particular, this study aims to (a) investigate the performance of a semi-pilot fluidised bed pyrolysis unit in converting biosolids into biochar, (b) examine the ability of the pyrolysis-combustion integrated process to destruct PFASs present in biosolids and (c) study the application of biosolids derived biochar for removing PFASs from contaminated water. The semi-pilot fluidised bed pyrolysis unit demonstrated stable temperature and oxygen profiles in the reactor. The yield of biochar was found to be 36-45% at studied temperatures (500-600 degrees C). The produced biosolids derived biochar samples, due to their lower H/C and O/C ratio, were found to be extremely stable with an expected long (millennia) residence time in soil. It was concluded that >90% removal of perfluorooctanesulfonate (PFOS) and perfluorooctanoic acid (PFOA) from biosolids derived biochar could be achieved in the pyrolysis-combustion integrated process. The biosolids derived biochar demonstrated >80% adsorption of long-chain PFASs and 19-27% adsorption of short-chain PFASs from PFAS contaminated water.
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