Modeling of organic shock loading in a fluidized-bed bioreactor containing sorbent particles

Peñas, Francisco Javier; Sevillano, Xabier; Peñas, Mario Iván

doi:10.1016/j.bej.2019.107308

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…On the other hand, given their high solubility in water, CDs are cross-linked into water-insoluble cyclodextrin-based polymers (CDPs) to enhance their usability for water treatment. For instance, taking advantage of the good sorption properties of CDs to dampen inhibitory effects by shockloading events, CDP hydrogels have also been used as carrier particles for attached-growth of phenoldegrading bacteria in bioreactors [4,5]. The uses of cyclodextrin crosslinked polymers as sorbents of aromatic compounds have been known for years [3,6] and their application to the treatment of phenolic resin plant wastewaters has also been previously reported [7].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cresols From Water By Packed Beds of Cyclodextrin-Based Hydrogels

Peñas

Romo

Isasi

2021

Preprint

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A cyclodextrin-based polymer was prepared by crosslinking β-cyclodextrin with epichlorohydrin to be assessed as a sorbent material for cresols in packed-bed columns. Both Langmuir and Freundlich isotherms were appropriate to describe the sorption equilibrium in the conditions tested, and the thermodynamic parameters obtained for this process confirmed its exothermic nature with similar enthalpies (between −6.8 and −8.3 kJ/mol) for the three isomers. The removal of cresols from water was carried out in nine cycles of sorption-desorption in fixed-column experiments with the cyclodextrin hydrogel, achieving sorption capacities of 6.2, 11.6, and 15.1 mg/g for o-, m-, p-cresol, respectively. The experimental data for the breakthrough and the elution curves have been successfully modeled by two effective two-parameter equations, a dose-response model for the sorption step and a pulse-peak model for the regeneration step. The cyclodextrin polymer matrix has been proven to be an effective a good sorbent material for removing cresols from water, exhibiting remarkable reusability performance and structural stability throughout the successive elution steps carried out with methanol.

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Section: Introductionmentioning

confidence: 99%

Removal of Cresols From Water By Packed Beds of Cyclodextrin-Based Hydrogels

Peñas

Romo

Isasi

2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the other hand, given their high solubility in water, CDs are cross-linked into water-insoluble cyclodextrin-based polymers (CDPs) to enhance their usability for water treatment. For instance, taking advantage of the good sorption properties of CDs to dampen inhibitory effects by shock-loading events, CDP hydrogels have also been used as carrier particles for attached-growth of phenol-degrading bacteria in bioreactors [5,6]. The uses of cyclodextrin crosslinked polymers as sorbents of aromatic compounds have been known for years [4,7] and their application to the treatment of phenolic resin plant wastewaters has also been previously reported [8].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cresols From Water by Packed Beds of Cyclodextrin-Based Hydrogels

2021

Self Cite

View full text Add to dashboard Cite

A cyclodextrin-based polymer was prepared by crosslinking β-cyclodextrin with epichlorohydrin to be assessed as a sorbent material for cresols in packed-bed columns. Both Langmuir and Freundlich isotherms were appropriate to describe the sorption equilibrium in the conditions tested, and the thermodynamic parameters obtained for this process confirmed its exothermic nature with similar enthalpies (between − 6.8 and − 8.3 kJ/mol) for the three isomers. The removal of cresols from water was carried out in nine cycles of sorption–desorption in fixed-column experiments with the cyclodextrin hydrogel, achieving sorption capacities of 6.2, 11.6, and 15.1 mg/g for o-, m-, p-cresol, respectively. These differences in sorption capacities are due to the different chemical structures of cresols, that is, the relative position of the methyl and hydroxyl groups. However, similar sorption rates were observed for each isomer, with a mean value of 0.10 mg-cresol g-CDP–1 min–1 in all cases. The experimental data for the breakthrough and the elution curves have been successfully modeled by two effective two-parameter equations, a dose–response model for the sorption step and a pulse-peak model for the regeneration step. The cyclodextrin polymer matrix has been proven to be an effective a good sorbent material for removing cresols from water, exhibiting remarkable reusability performance and structural stability throughout the successive elution steps carried out with methanol.

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Study on the compatibility of a treated effluent from automobile industry with conventional municipal activated sludge process

Peñas,

Tapia,

Vitas

2024

Int. J. Environ. Sci. Technol.

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The on-site-treated effluent from an automobile manufacturing company is discharged into the public sewage system for further treatment. However, the upgrade of the treatment plant to reduce the effluent pollutant load led to the discharge limit for phenols being occasionally exceeded. The concern of the water authority prompted a study to investigate whether the toxicity of phenols could affect the performance of the receiving municipal wastewater treatment plant. To this end, mixtures of the industrial effluent and synthetic municipal wastewater were tested in a laboratory-scale activated sludge system. The bioreactor was fed with increasing ratios of the industrial wastewater in the combined influent (from 10 to 50%) over 7 months. No significant differences were observed in the system performance fed only with the synthetic wastewater (during the acclimation stage) or with the industrial wastewater. The bioreactor achieved average removal efficiencies of 70% for phenols even when half of the combined influent was the industrial wastewater. Bearing in mind the question of phenols, an important drawback was the high uncertainty in their determination by the conventional phenol index method due to the matrix effect. To overcome this a spectrophotometric procedure based on the serial dilutions of each pair of influent and effluent samples has been developed. Although strong microbial selection was observed by the changing bioreactor environment, the industrial effluent was found to be fully compatible with further treatment by conventional activated sludge process.

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Modeling of organic shock loading in a fluidized-bed bioreactor containing sorbent particles

Cited by 5 publications

References 28 publications

Removal of Cresols From Water By Packed Beds of Cyclodextrin-Based Hydrogels

Removal of Cresols From Water By Packed Beds of Cyclodextrin-Based Hydrogels

Removal of Cresols From Water by Packed Beds of Cyclodextrin-Based Hydrogels

Study on the compatibility of a treated effluent from automobile industry with conventional municipal activated sludge process

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