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Factors in PFAS Adsorption Competition During Granular Activated Carbon Treatment of Drinking Water Treatment.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Factors in PFAS Adsorption Competition During Granular Activated Carbon Treatment of Drinking Water Treatment./
作者:	Tang, Tiffany Meijuan.
面頁冊數:	1 online resource (164 pages)
附註:	Source: Masters Abstracts International, Volume: 84-04.
Contained By:	Masters Abstracts International84-04.
標題:	Perfluoroalkyl & polyfluoroalkyl substances. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29419934click for full text (PQDT)
ISBN:	9798352650981

Factors in PFAS Adsorption Competition During Granular Activated Carbon Treatment of Drinking Water Treatment.
Tang, Tiffany Meijuan.

Factors in PFAS Adsorption Competition During Granular Activated Carbon Treatment of Drinking Water Treatment. - 1 online resource (164 pages)

Source: Masters Abstracts International, Volume: 84-04.

Thesis (M.Sc.)--North Carolina State University, 2022.

Includes bibliographical references

Per- and polyfluoroalkyl substances (PFAS) are a class of contaminants that are widespread in U.S. drinking water supplies. Due to a growing awareness of health concerns resulting from PFAS exposure via drinking water, understanding PFAS removal technologies is becoming increasingly important to water utilities. Although conventional water treatment processes are not effective against PFAS removal, some advanced treatment technologies are.One such advanced treatment technology is granular activated carbon (GAC) adsorption. GAC, although effective at removing PFAS, is indiscriminate between PFAS and other surface water constituents, such as dissolved organic matter (DOM), and GAC service life decreases with increasing DOM concentration. Therefore, it may be beneficial to remove DOM prior to GAC treatment for PFAS removal. Furthermore, it is not well understood how PFAS concentrations in the GAC adsorber influent and co-occurring PFAS affect GAC performance. The two overarching objectives of this research were therefore to 1) study effects of influent PFAS concentrations and co-occurring PFAS on GAC use rate in coagulated surface water, and 2) to study the effects of DOM removal prior to GAC adsorption on GAC use rate for PFAS removal.To meet the research objectives, rapid small-scale column tests (RSSCTs) were conducted. RSSCTs were designed using the constant diffusivity approach. For the first objective, four PFAS [perfluorohexanoic acid (PFHxA), perfluorobutane sulfonic acid (PFBS), pefluorohexane sulfonic acid (PFHxS), and perfluorooctane sulfonic acid (PFOS)] were spiked into coagulated, settled surface water [total organic carbon (TOC) concentration = 1.18 mg/L] either individually or as bi-solute mixtures at concentrations of 0.2 or 10 nM for each PFAS. Resulting PFAS breakthrough curves demonstrated that neither the influent PFAS concentration nor the presence of co-occurring PFAS had a substantial effect on normalized PFAS breakthrough curves. In general, breakthrough curves for individual PFAS were within 20% of each other regardless of the influent PFAS concentration or the presence of co-occurring PFAS.For the second objective, a mixture of 16 PFAS was spiked into pretreated surface water. Pretreatment processes that were investigated included (1) coagulation/flocculation/ sedimentation (CFS), CFS followed by ozonation, and CFS followed by ozonation (O3) and biologically active carbon (BAC) filtration at the full-scale and (2) CFS, powdered activated carbon (PAC), magnetic anion exchange (MIEX), PAC + CFS, and MIEX + CFS at the benchscale. The most effective treatment for extending GAC service life was MIEX + CFS, which extended GAC service life by a factor of 2.25 ± 0.69 on average across the studied PFAS when compared to full-scale CFS alone. Similarly, PAC + CFS and CFS + O3 + BAC extended GAC service life by average factors of 2.16 ± 0.35 and 2.01±0.29 respectively when compared to fullscale CFS. All DOM removal processes extended GAC service life, and while DOM removal had a beneficial impact on GAC use rates for all studied PFAS, the benefits became somewhat more pronounced as the molecular weight of the targeted PFAS increased. Although MIEX + CFS resulted in the highest TOC removal percentage among the tested DOM removal approaches, GAC performance for PFAS removal from MIEX + CFS treated water was similar to other pretreatments that achieved lower TOC removals such as CFS + O3 + BAC and PAC + CFS. This finding suggests that MIEX was removing DOM fractions that do not directly compete with PFAS for GAC adsorption sites.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798352650981Subjects--Topical Terms:

3695333
Perfluoroalkyl & polyfluoroalkyl substances.
Index Terms--Genre/Form:

542853
Electronic books.

Factors in PFAS Adsorption Competition During Granular Activated Carbon Treatment of Drinking Water Treatment.
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500 $a Source: Masters Abstracts International, Volume: 84-04.
500 $a Advisor: de Los Reyes, Francis Lajara; Call, Douglas; Knappe, Detlef.
502 $a Thesis (M.Sc.)--North Carolina State University, 2022.
504 $a Includes bibliographical references
520 $a Per- and polyfluoroalkyl substances (PFAS) are a class of contaminants that are widespread in U.S. drinking water supplies. Due to a growing awareness of health concerns resulting from PFAS exposure via drinking water, understanding PFAS removal technologies is becoming increasingly important to water utilities. Although conventional water treatment processes are not effective against PFAS removal, some advanced treatment technologies are.One such advanced treatment technology is granular activated carbon (GAC) adsorption. GAC, although effective at removing PFAS, is indiscriminate between PFAS and other surface water constituents, such as dissolved organic matter (DOM), and GAC service life decreases with increasing DOM concentration. Therefore, it may be beneficial to remove DOM prior to GAC treatment for PFAS removal. Furthermore, it is not well understood how PFAS concentrations in the GAC adsorber influent and co-occurring PFAS affect GAC performance. The two overarching objectives of this research were therefore to 1) study effects of influent PFAS concentrations and co-occurring PFAS on GAC use rate in coagulated surface water, and 2) to study the effects of DOM removal prior to GAC adsorption on GAC use rate for PFAS removal.To meet the research objectives, rapid small-scale column tests (RSSCTs) were conducted. RSSCTs were designed using the constant diffusivity approach. For the first objective, four PFAS [perfluorohexanoic acid (PFHxA), perfluorobutane sulfonic acid (PFBS), pefluorohexane sulfonic acid (PFHxS), and perfluorooctane sulfonic acid (PFOS)] were spiked into coagulated, settled surface water [total organic carbon (TOC) concentration = 1.18 mg/L] either individually or as bi-solute mixtures at concentrations of 0.2 or 10 nM for each PFAS. Resulting PFAS breakthrough curves demonstrated that neither the influent PFAS concentration nor the presence of co-occurring PFAS had a substantial effect on normalized PFAS breakthrough curves. In general, breakthrough curves for individual PFAS were within 20% of each other regardless of the influent PFAS concentration or the presence of co-occurring PFAS.For the second objective, a mixture of 16 PFAS was spiked into pretreated surface water. Pretreatment processes that were investigated included (1) coagulation/flocculation/ sedimentation (CFS), CFS followed by ozonation, and CFS followed by ozonation (O3) and biologically active carbon (BAC) filtration at the full-scale and (2) CFS, powdered activated carbon (PAC), magnetic anion exchange (MIEX), PAC + CFS, and MIEX + CFS at the benchscale. The most effective treatment for extending GAC service life was MIEX + CFS, which extended GAC service life by a factor of 2.25 ± 0.69 on average across the studied PFAS when compared to full-scale CFS alone. Similarly, PAC + CFS and CFS + O3 + BAC extended GAC service life by average factors of 2.16 ± 0.35 and 2.01±0.29 respectively when compared to fullscale CFS. All DOM removal processes extended GAC service life, and while DOM removal had a beneficial impact on GAC use rates for all studied PFAS, the benefits became somewhat more pronounced as the molecular weight of the targeted PFAS increased. Although MIEX + CFS resulted in the highest TOC removal percentage among the tested DOM removal approaches, GAC performance for PFAS removal from MIEX + CFS treated water was similar to other pretreatments that achieved lower TOC removals such as CFS + O3 + BAC and PAC + CFS. This finding suggests that MIEX was removing DOM fractions that do not directly compete with PFAS for GAC adsorption sites.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Perfluoroalkyl & polyfluoroalkyl substances. $3 3695333
650 4 $a Acids. $3 922327
650 4 $a Surface water. $3 3685235
650 4 $a Resins. $3 3682318
650 4 $a Biofiltration. $3 3695334
650 4 $a Adsorption. $3 580046
650 4 $a Water treatment plants. $3 783768
650 4 $a Design. $3 518875
650 4 $a Molecular weight. $3 3683783
650 4 $a Drinking water. $3 605014
650 4 $a Chromatography. $3 1073639
650 4 $a Performance evaluation. $3 3562292
650 4 $a Activated carbon. $3 3685349
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Chemistry. $3 516420
650 4 $a Environmental engineering. $3 548583
650 4 $a Hydrologic sciences. $3 3168407
650 4 $a Industrial engineering. $3 526216
650 4 $a Water resources management. $3 794747
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710 2 $a North Carolina State University. $3 1018772
773 0 $t Masters Abstracts International $g 84-04.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29419934 $z click for full text (PQDT)