Regeneration of per- and polyfluoroalkyl substance-laden granular activated carbon using a solvent based technology

Siriwardena, Dinusha P.; James, Ryan R.; Dasu, Kavitha; Thorn, Jonathan; Iery, Ramona Darlington; Palá, Francisco Borrás; Schumitz, Denise; Eastwood, Stephanie; Burkitt, Nathan

doi:10.1016/j.jenvman.2021.112439

Cited by 32 publications

(10 citation statements)

References 45 publications

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“…However, as it has been reported in several publications [50][51][52][53][54] and also demonstrated further on in this paper, during each regeneration cycle, the adsorption capacity of the GAC diminished. In that case, there is a correlation between the number of regeneration cycles and the decreasing fractional saturation time (x i = f (n i )) in a sort of a "regeneration performance equilibria data" (RPED) for specific regeneration process conditions which can be obtained experimentally, as will be explained in Section 3.3.…”

Section: Economic Tool To Evaluate the Advantages Of Regenerationsupporting

confidence: 83%

Mathematical Tool Based on Breakthrough Curves to Evaluate the Economic Advantages of Chemical Regeneration of Activated Carbon in Power Plants: A Comparative Study

et al. 2021

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A mathematical tool has been developed to evaluate the economic advantages of in-situ chemical regeneration of fixed-bed industrial adsorbers of granular activated carbon for cooling water treatment systems in Cuban power plants. Two scenarios of activated carbon (AC) management in a power plant were compared by applying the proposed model. The economic profit by implementing the regeneration strategy as a function of the number of regeneration cycles was determined and optimized. Breakthrough curves were obtained to assess the adsorption performance of the AC after progressive saturation–chemical regeneration cycles using synthetic water and hydrochloric acid, respectively. For the first saturation cycle, the breakthrough time was 272 min and after 10 cycles, it was reduced to 58 min, indicating a decrease of the adsorption capacity of 21%. The AC adsorption performance in terms of saturation time as a function of the number of regeneration cycles was considered one of the tool parameters. The proposed tool allows to determine the optimal number of regeneration cycles for a maximum economic profit in the regeneration strategy. It was demonstrated, using the proposed tool, that after an optimum of seven regeneration cycles, the power plant expends only 26% of the total investment. The simplicity of the tool permits a rapid way to find the most profitable number of regeneration cycles by combining economic, technical and adsorption efficiency parameters in one function, thus improving the AC management strategy at an industrial scale with corresponding environmental and economic advantages, including sustainability.

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Section: Economic Tool To Evaluate the Advantages Of Regenerationsupporting

confidence: 83%

Mathematical Tool Based on Breakthrough Curves to Evaluate the Economic Advantages of Chemical Regeneration of Activated Carbon in Power Plants: A Comparative Study

et al. 2021

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“…Regenerating GAC is also more complex as it requires heating at high temperatures (700°C–900°C) ( Xiao et al., 2020 ) as well as chemical reactivation ( Park et al., 2019 ). The high regeneration temperature may alter the physical and chemical properties of GAC, which in turn could affect the adsorption behavior ( Siriwardena et al., 2021 ). Other adsorbents such as ion-exchange resins ( Dixit et al., 2019 ), alumina ( Wang and Shih, 2011 ), and quaternized cotton ( Deng et al., 2012 ) are not thermally and chemically stable, which inhibits their regeneration efficacy ( Alves et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics

et al. 2022

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“…Thermal regeneration of spent AC has been studied in detail; generally, the spent PFAS-loaded AC is exposed to pyrolyzing conditions of 800 °C or more in order to completely vaporize the adsorbed contaminants. , However, the characteristics and adsorbent capacities of AC are altered in each regeneration cycle. Detailed investigations of the influence of thermal treatment of a PFAS-loaded granulated activated carbon (GAC) on the performance and characteristics of the GAC are lacking .…”

Section: Resultsmentioning

confidence: 99%

Adsorption of PFAS by All-Silica Zeolite β: Insights into the Effect of the Water Matrix, Regeneration of the Material, and Continuous PFAS Adsorption

Lauwers,

Vercammen,

De Vos

2023

ACS Appl. Mater. Interfaces

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Per- and polyfluoroalkyl substances (PFAS) are man-made organic compounds ubiquitously present in the environment. Due to their persistency and bioaccumulative nature, and because of increasingly stringent regulations of PFAS, their removal from the environment is necessary. Our initial study identified all-silica zeolite β as an alternative adsorbent with a high selectivity, affinity, and capacity for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS) removal. Here, we study the influence of the PFAS chain length on the affinity and capacity of a novel material, all-silica zeolite β, showing that the *BEA zeolite is an ideal sorbent for the removal of PFAS with 8 carbons. The solution pH and the addition of cations or natural organic substances to the water matrix have minimal influence on PFOA/PFOS removal with the zeolite. Next, regeneration of a PFOS-loaded zeolite was assessed; besides thermal, solvent-driven regeneration of the zeolite is also possible, using well-selected combinations of non-noxious solvents. Lastly, continuous adsorption experiments show that zeolite can be used for larger-scale applications.

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Regeneration of per- and polyfluoroalkyl substance-laden granular activated carbon using a solvent based technology

Cited by 32 publications

References 45 publications

Mathematical Tool Based on Breakthrough Curves to Evaluate the Economic Advantages of Chemical Regeneration of Activated Carbon in Power Plants: A Comparative Study

Mathematical Tool Based on Breakthrough Curves to Evaluate the Economic Advantages of Chemical Regeneration of Activated Carbon in Power Plants: A Comparative Study

Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics

Adsorption of PFAS by All-Silica Zeolite β: Insights into the Effect of the Water Matrix, Regeneration of the Material, and Continuous PFAS Adsorption

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