Persulfate oxidation of perfluorooctanoic acid under the temperatures of 20–40°C

► PFOA can be effectively decomposed and mineralized at relatively low temperatures (20–40°C). ► A lower system pH or higher persulfate doses resulted in a faster PFOA degradation rate. ► A model was developed that predicted the PFOA decay at various reaction times. Treatment of persistent and bioac...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2012-08, Vol.198-199, p.27-32
Main Authors: Lee, Yu-Chi, Lo, Shang-Lien, Kuo, Jeff, Lin, Yi-Ling
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
heat
irradiation
oxidation
Perfluorocarboxylic acids
Perfluorooctanoic acid
Persulfate
Reactors
Temperature
ultraviolet radiation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► PFOA can be effectively decomposed and mineralized at relatively low temperatures (20–40°C). ► A lower system pH or higher persulfate doses resulted in a faster PFOA degradation rate. ► A model was developed that predicted the PFOA decay at various reaction times. Treatment of persistent and bioaccumulative perfluorooctanoic acid (PFOA) in water using persulfate (S2O82-) oxidation with heating or UV radiation has been found effective. However, applications of this process to remediate PFOA contamination require a relatively high temperature (70–90°C) or energy-consuming irradiation to proceed. The objectives of this study were to investigate persulfate oxidation of PFOA under relatively low temperatures (20–40°C), more commonly encountered in the natural environment and to evaluate the effects of pH (pH=2.5, 3.6, 7.1 and 11.0) and persulfate doses (20–200mM) on the reaction rate for this temperature range. PFOA compounds (241.5μM) with 200mM persulfate were almost completely decomposed under an initial pH of 2.5 after 72h at 40°C and after 215h at 30°C. Even under such a low temperature of 20°C, the decomposition efficiency reached 80.5% after 648h. Lower pH or higher persulfate doses resulted in a faster PFOA degradation. A series of kinetic experiments (20, 26, 30 and 40°C) on PFOA degradation by persulfate oxidation were conducted, and a model was developed that successfully predicted the PFOA decay at various reaction times in this low temperature range (20–40°C).
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2012.05.073