Potential for ACH-based Water Treatment Residuals for Mitigation of Perfluoroalkyl Acids Leaching from Biosolids

Openiyi, Elijah

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https://hdl.handle.net/2142/114136 Copy

Description

Title

Potential for ACH-based Water Treatment Residuals for Mitigation of Perfluoroalkyl Acids Leaching from Biosolids

Author(s)

Openiyi, Elijah

Issue Date

2022-04-27

Keyword(s)

• per- and polyfluoroalkyl substances
• PFAS

Abstract

Aluminum chlorohydrate (ACH) is used by treatment plants to improve finished water quality. The Al-based residuals after water treatment (WTRs) have been found to be a good sorptive medium for phosphates. We hypothesized WTRs may have a high potential to sorb perfluoroalkyl acids (PFAAs). We evaluated the affinity of ACH-based WTRs (< 2 mm) to sorb seven PFAAs (PFBS, PFHxS, PFOS, PFHxA, PFHpA, PFOA and PFNA) from porewater generated from two biosolids. PFAA sorption (24-h) and desorption (48-h) were conducted using 0.005 to 0.5g ACH-WTRs equilibrated with 9-mL of porewater amended with PFAAs to increase initial concentrations. Adsorption increased with increasing ACH-WTR concentrations and increasing PFAA chain length. Desorption decreased with increasing ACH-WTR concentrations and generally increasing PFAA chain length. Although trends were similar for both porewaters, one porewater resulted in higher percent sorption and lower percent desorption for most PFAAs. Electrolyte composition and DOM concentrations are being measured and may offer insight into the differences observed between the porewaters. The results support that applying ACH-WTR to biosolid-amended fields may be a good mitigation approach for reducing PFAS leaching.

Series/Report Name or Number

2022 Emerging Contaminants in the Environment Conference (ECEC22)

Type of Resource

• text
• still image

Language

en

Permalink

• https://youtu.be/NdQjDXvq00E
• http://hdl.handle.net/2142/114136

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