The role of mesopores in MTBE removal with granular activated carbon

Redding, Adam M.; Cannon, Fred S.

doi:10.1016/j.watres.2014.02.054

Cited by 29 publications

(16 citation statements)

References 27 publications

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“…There are varying results and evaluations in the literature. [ 25–45 ] In batch experiments, the initial DNOM concentration in the solution decreased with time. In contrast, the amount of DNOM in the influent of column experiments does not change over time.…”

Section: Resultsmentioning

confidence: 99%

“…Using the data obtained from the RSSCT studies, Equations (9–11), and procedure given by Crittenden et al., [ 16,21–23 ] Poddaret al., [ 24 ] Redding, [ 25 ] and Qiu et al., [ 26 ] the scaling and evaluation of the full‐scale column were carried out

Carbon usage rate, CUR = \frac{M_{GAC}}{Q . t_{normalbk}} = \frac{1}{Specific throughput}

\frac{t_{SC}}{t_{LC}} = \frac{EBC {normalT}_{normalSC}}{EBC {normalT}_{normalLC}} = {((), \frac{d_{SC}^{2}}{d_{LC}^{2}})}^{2 - x}

where M GAC is the mass of GAC (kg), Q is the flow rate (m 3 h −1 ), t bk is the time to breakthrough (day), t SC is the operation time in small scale columns (day), t LC is the operation time in large columns (day), d SC is the particle diameter in small scale columns (mm), d LC is the particle diameter in small scale columns (mm), and x is a unitless diffusivity factor depending on pore diffusivity (0 or 1 for constant diffusivity and proportional diffusivity, respectively).…”

Section: Methodsmentioning

confidence: 99%

“…where L SC is the bed length (cm), A SC is the column cross section (m 2 ), v SC is the interstitial velocity in small scale columns (m h −1 ), M SC is the mass of the adsorbent in small scale columns (g), SC is the liquid density of the adsorbate in small scale columns (g L −1 ), V W is the volume of water (m 3 ), V bed is the bed volume (m 3 ), t SC is the operation time in small scale columns (day), Q is the flow rate (m 3 h −1 ), Q SC is the flow rate in small scale columns (m 3 h −1 ), t is the operation time (day), t bk is the time to breakthrough at the treatment (day), and M GAC is the mass of GAC (kg). Using the data obtained from the RSSCT studies, Equations (9-11), and procedure given by Crittenden et al, [16,[21][22][23] Poddaret al, [24] Redding, [25] and Qiu et al, [26] the scaling and evaluation of the full-scale column were carried out…”

Section: Rapid Small-scale Column Test (Rssct) Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Batch and Continuous Design of a Full‐Scale Treatment Facility for Removing Dissolved Natural Organic Matter

Sarı

Oztas

Keskınkan

et al. 2020

CLEAN Soil Air Water

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Batch and continuous flow adsorption experiments are carried out and the design of a full‐scale facility for removing dissolved natural organic matter (DNOM) from Catalan Lakewater is demonstrated. The adsorption efficiency is proportional to the temperature and the amount of adsorbent unlike pH increase. The highest DNOM removal rate is obtained at 35 °C, pH 4, and an adsorbent amount of 0.8 g L−1. Optimum contact time for batch studies is 60 min at equilibrium. Correlation constants (r) of Langmuir and Freundlich isotherms are 0.8905 and 0.9739, respectively. Based on the Freundlich isotherm, the highest adsorption capacity (qmax) obtained is 2.44 and 6.01 mg DNOM/g granulated activated carbon (GAC) for raw and enriched water, respectively. Consequently, the effects of adsorbent amount, bed depth, empty bed contact time, and organic loading on removal performance are investigated in the rapid small‐scale column test (RSSCT) columns. The targeted effluent concentration of 1 mg DNOM/L can easily be achieved in the columns. At the design capacity of the facility, 15 adsorption columns with dimensions of 7 m height, 4.33 m diameter, and 22 days of operation cycle are required to remove DNOM from raw water.

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Section: Resultsmentioning

confidence: 99%

Carbon usage rate, CUR = \frac{M_{GAC}}{Q . t_{normalbk}} = \frac{1}{Specific throughput}

\frac{t_{SC}}{t_{LC}} = \frac{EBC {normalT}_{normalSC}}{EBC {normalT}_{normalLC}} = {((), \frac{d_{SC}^{2}}{d_{LC}^{2}})}^{2 - x}

Section: Methodsmentioning

confidence: 99%

Section: Rapid Small-scale Column Test (Rssct) Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Batch and Continuous Design of a Full‐Scale Treatment Facility for Removing Dissolved Natural Organic Matter

Sarı

Oztas

Keskınkan

et al. 2020

CLEAN Soil Air Water

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show abstract

“…Ozone ultrasonic irradiation [8], hybrid oxidation [11], ozonation [20], UV/chlorine advanced oxidation process [14], electro-photocatalytic processes such as TiO2 [21,23,27], ZnO-AgCl nanocomposite photocatalyst [18] and oxidation with per-sulfate to produce activated carbon for the removal of MTBE [10] are some of the methods used to reduce and eliminate this product. The most common methods of removing MTBE from drinking water are aeration [13], application of natural and modified diatoms [2,3,33] optical dispersion with nano-zeolite combinations ZnO [34], adsorption by activated carbon [26], advanced oxidation processes (using a fluoride ion, O3, and H2O2), Fenton and pseudoFenton [5,12], UV-Fenton [17] and using H2O2in the presence of Fe-zeolite catalysts [24]. Although there are many physical and chemical methods for the removal of pollution caused by MTBE, biodegradation can be a good alternative that can reduce the harmful and adverse effects on the environment at lower costs due to some reasons including high expenses, by-products formation and low efficiency [15].…”

Section: Introductionmentioning

confidence: 99%

Modified Sequencing Batch Airlift Reactor Capability in MTBE Removal

Ayati

Rezaei

2017

IJEE

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A B S T R A C TThe aim of this study was to investigate MTBE removal efficiency using sequencing batch airlift reactor (SBAR) and to determine the share of aeration and adsorption processes during the operation. The present study was conducted with a new design of the system (cubic area and embedded baffle).The reactor was applied in 4-h cycles, which included 2 min filling, 210 min aeration, 5 min sedimentation, 8 min draw, and 15 min idle time. One week after start-up, the initial brown granules were observed. During the operation, some granules were formed with the size of 2-6 mm, average settling velocity and density of 0.66 cm/s and 0.06 g/mL, respectively. The results showed that COD removal efficiency was over 94 percent.

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“…While, the simultaneously favourable adsorption and mass transfer of OMPs has been attributed to a combination of both micropores and mesopores (Pelekani and Snoeyink, 2001;Redding and Cannon, 2014), suggesting the suitability of a broad pore-size-distributed carbon for the dynamic fixed-bed application. In the perspective of adsorption competition, the preadsorbed bulk organic matter (e.g.…”

Section: Introductionmentioning

confidence: 99%

Integrating powdered activated carbon into wastewater tertiary filter for micro-pollutant removal

Aarts

Shang

et al. 2016

Journal of Environmental Management

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Integrating powdered activated carbon (PAC) into wastewater tertiary treatment is a promising technology to reduce organic micro-pollutant (OMP) discharge into the receiving waters. To take advantage of the existing tertiary filter, PAC was pre-embedded inside the filter bed acting as a fixed-bed adsorber. The pre-embedding (i.e. immobilization) of PAC was realized by direct dosing a PAC solution on the filter top, which was then promoted to penetrate into the filter media by a down-flow of tap water. In order to examine the effectiveness of this PAC pre-embedded filter towards OMP removal, batch adsorption tests, representing PAC contact reactor (with the same PAC mass-to-treated water volume ratio as in the PAC pre-embedded filter) were performed as references. Moreover, as a conventional dosing option, PAC was dosed continuously with the filter influent (i.e. the wastewater secondary effluent with the investigated OMPs). Comparative results confirmed a higher OMP removal efficiency associated with the PAC pre-embedded filter, as compared to the batch system with a practical PAC residence time. Furthermore, over a filtration period of 10 h (approximating a realistic filtration cycle for tertiary filters), the continuous dosing approach resulted in less OMP removal. Therefore, it was concluded that the pre-embedding approach can be preferentially considered when integrating PAC into the wastewater tertiary treatment for OMP elimination.

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The role of mesopores in MTBE removal with granular activated carbon

Cited by 29 publications

References 27 publications

Batch and Continuous Design of a Full‐Scale Treatment Facility for Removing Dissolved Natural Organic Matter

Batch and Continuous Design of a Full‐Scale Treatment Facility for Removing Dissolved Natural Organic Matter

Modified Sequencing Batch Airlift Reactor Capability in MTBE Removal

Integrating powdered activated carbon into wastewater tertiary filter for micro-pollutant removal

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