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Removal of PFASs from biosolids using a semi-pilot scale pyrolysis reactor and the application of biosolids derived biochar for the removal of PFASs from contaminated water

journal contribution
posted on 2022-09-29, 10:16 authored by S Kundu, S Patel, Pobitra HalderPobitra Halder, T Patel, M Hedayati Marzbali, B K Pramanik, J Paz-Ferreiro, C C De Figueiredo, D Bergmann, A Surapaneni, M Megharaj, K Shah
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 °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. This journal is

History

Journal

Environmental Science: Water Research and Technology

Volume

7

Issue

3

Pagination

638 - 649

ISSN

2053-1400

eISSN

2053-1419