Fate of biosolids-bound PFAS through pyrolysis coupled with thermal oxidation for air emissions control

被引：0

作者：

Winchell, Lloyd J. ^{[1
]}

Cullen, Joshua ^{[2
]}

Ross, John J. ^{[1
]}

Seidel, Alex ^{[1
]}

Romero, Mary Lou ^{[1
]}

Kakar, Farokh ^{[1
]}

Bronstad, Embrey ^{[1
]}

Wells, Martha J. M. ^{[3
]}

Klinghoffer, Naomi B. ^{[2
]}

Berruti, Franco ^{[2
]}

Miot, Alexandre ^{[4
]}

Bell, Katherine Y. ^{[1
]}

机构：

[1] Brown and Caldwell, Walnut Creek,CA, United States

[2] Department of Chemical and Biochemical Engineering, Institute for Chemicals and Fuels from Alternative Resources (ICFAR), Western University, London,ON, Canada

[3] EnviroChem Services, Cookeville,TN, United States

[4] Silicon Valley Clean Water, Redwood,CA, United States

来源：

Water Environment Research | 2024年 / 96卷 / 11期

关键词：

Biosolids;

D O I：

10.1002/wer.11149

中图分类号：

学科分类号：

摘要：

Pyrolysis has been identified as a possible thermal treatment process for reducing perfluoroalkyl and polyfluoroalkyl substances (PFAS) from wastewater solids, though off-gas from the pyrolysis unit can still be a source of PFAS emissions. In this work, the fate of PFAS through a laboratory-scale pyrolysis unit coupled with a thermal oxidizer for treatment of off-gasses is documented. Between 91.5% and >99.9% reduction was observed through the entire system for specific compounds based on targeted analyses. Overall, the pyrolysis and thermal oxidizer system removed 99.4% of the PFAS moles introduced. Furthermore, shorter chain variants comprised the majority of reportable PFAS in the thermal oxidizer flue gas, indicating the longer chain compounds present in the dried biosolids fed to pyrolyzer decompose through the system. Practitioner Points: Thermal oxidation is a promising treatment technology for exhaust systems associated with thermal biosolids treatments. Thermal oxidation demonstrated significant degradation capabilities, with gas phase emissions comprising only 0.200% of initial PFAS concentrations to the system. Short-chain PFAS made up a higher percent of thermal oxidizer emissions, ranging between 54.4% and 79.5% of PFAS in the exhaust on a molar basis. The possibility of recombinant PFAS formation and partial thermal decomposition of PFAS in thermal oxidation is a needed area of research. © 2024 The Author(s). Water Environment Research published by Wiley Periodicals LLC on behalf of Water Environment Federation.

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