Adsorption properties of sugarcane bagasse and corn cob for the sulfamethoxazole removal in a fixed-bed column
01 Dec 2021-Sustainable Environment Research (Springer Science and Business Media LLC)-Vol. 31, Iss: 1, pp 1-14
TL;DR: In this paper, the adsorption capacity of sulfamethoxazole (SMX) onto sugarcane bagasse (SB) and corn cob (CC) in a continuous fixed-bed was compared.
About: This article is published in Sustainable Environment Research.The article was published on 2021-12-01 and is currently open access. It has received 4 citations till now. The article focuses on the topics: Adsorption.
Citations
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TL;DR: In this article , a fixed-bed column to remove sulfamethoxazole packed with sugarcane bagasse was scaled up from laboratory (DL = 2.2 cm) to pilot unit (DP = 4.4 cm).
Abstract: The scaling up of adsorption columns is a crucial step toward the removal of emerging pollutants from domestic and industrial wastewaters. In this study, a fixed-bed column to remove sulfamethoxazole packed with sugarcane bagasse was scaled up from laboratory (DL = 2.2 cm) to pilot unit (DP = 4.4 cm) using a scaling factor (K = 2). In addition to the basic similarity rules for scaling, three new criteria were proposed for the mass adsorbent, flow rate, and bed volume. Then, three lab-scale tests at flow rate of 5 mL/min and bed heights of 15, 25, and 35 cm were transferred to the pilot-scale column at flow rate of 20 mL/min and bed heights of 30, 50, and 70 cm, respectively. The breakthrough curves and the fixed-bed parameters (residence time tR, saturation time ts, adsorption capacity qe, volume of solution treated Vef, and removal percentage %R) obtained in both scales were compared to define their effect with the increase of scale. Finally, a mechanistic model was proposed to predict the breakthrough curves in both columns. The results exhibited that the breakthrough curves in the pilot-scale prolonged in time with higher breakthrough and saturation times than the laboratory breakthrough data. Additionally, tR, ts, and Vef changed in function of the K value used: ts and tR doubled their value in the pilot column or tRP=KtRL; Vef was eight times higher in the pilot column than the lab-column or VefP=K3VefL; qe and %R remained constant in both scales; these results were corroborated with the predicted breakthrough curves. Besides, the mechanistic model predicted with great precision the breakthrough data in both scales (R2>0.9), which means that the model can be used confidently for scaling up purposes. This study demonstrated new criteria which can be easily applied to scale up adsorption columns whit results that showed a correlation between both scales.
7 citations
TL;DR: In this paper , the potential of sugarcane bagasse (SB) for the removal of Mn (II) from aqueous media was evaluated, and a mathematical model was proposed to predict the breakthrough curves in a fixed-bed column.
Abstract: Biosorbents have drawn increasing attention for removing pollutants on lab-scale systems. Although biosorbents are ecofriendly, their potential on large-scale columns has not been assessed yet. This study evaluated the potential of sugarcane bagasse (SB) for the removal of Mn (II) from aqueous media. Firstly, batch experiments were conducted to establish the equilibrium data and predominant adsorption mechanisms. Secondly, a mathematical model was proposed to predict the breakthrough curves in a fixed-bed column. Alternatively, lab- and pilot-scale removal experiments were performed to validate the accuracy of the proposed model. Once the model was validated on both scales, it was employed to predict breakthrough curves for a semi-industrial column under actual conditions of a drinking water treatment plant. Langmuir isotherm (qmax: 2.82 mg/g) and Langmuir kinetic model (R2>0.98 and x2<0.01) reproduced the experimental equilibrium and kinetic behavior. The mathematical model successfully replicated the lab- and pilot-scale breakthrough data (R2>0.95 and x2<0.1). Therefore, its prediction on the semi-industrial scale was reliable. However, short breakthrough and exhaustion times were obtained on this column, which hinders SB from applying in actual raw water. The described methodology can be employed to assess the potential of other biosorbents for industrial applications.
TL;DR: In this article , the thermal evolution in a one-dimensional bagasse stockpile is investigated and it is shown that spontaneous combustion can be avoided by sequential building, under certain conditions spontaneous combustion will occur.
Abstract:
In this paper, we investigate the thermal evolution in a one-dimensional bagasse stockpile. The mathematical model involves four unknowns: the temperature, oxygen content, liquid water content and water vapour content. We first nondimensionalize the model to identify dominant terms and so simplify the system. We then calculate solutions for the approximate and full system. It is shown that under certain conditions spontaneous combustion will occur. Most importantly, we show that spontaneous combustion can be avoided by sequential building. To be specific, in a situation where, say, a
$4.7\,$
m stockpile can spontaneously combust, we could construct a
$3\,$
m pile and then some days later add another
$1.7\,$
m to produce a stable
$4.7\,$
m pile.
References
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TL;DR: A holistic view of health risk assessment of antibiotic resistance associated with antibiotic residues in the environment in contrast with that of the antibiotic resistant bacteria is provided and the main knowledge gaps and the future research that should be prioritized to achieve the quantitative risk assessment are discussed.
577 citations
TL;DR: A survey on the presence of pharmaceuticals in urban wastewater of a Spanish Mediterranean area (Castellon province) indicated that elimination of most of the selected compounds occurred during the treatment process of influent wastewater, although it was incomplete.
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TL;DR: This review could help those interested in column adsorption to reasonably choose or develop an accurate and convenient model for their study and practical application.
Abstract: Adsorption is one of the widely used processes in the chemical industry environmental application. As compared to mathematical models proposed to describe batch adsorption in terms of isotherm and kinetic behavior, insufficient models are available to describe and predict fixed-bed or column adsorption, though the latter one is the main option in practical application. The present review first provides a brief summary on basic concepts and mathematic models to describe the mass transfer and isotherm behavior of batch adsorption, which dominate the column adsorption behavior in nature. Afterwards, the widely used models developed to predict the breakthrough curve, i.e., the general rate models, linear driving force (LDF) model, wave propagation theory model, constant pattern model, Clark model, Thomas model, Bohart-Adams model, Yoon-Nelson model, Wang model, Wolborska model, and modified dose-response model, are briefly introduced from the mechanism and mathematical viewpoint. Their basic characteristics, including the advantages and inherit shortcomings, are also discussed. This review could help those interested in column adsorption to reasonably choose or develop an accurate and convenient model for their study and practical application.
324 citations
TL;DR: In this paper, an untreated pomegranate peel (PGP) derived from local agricultural activities was used to remove copper Cu(II) ions, and the results indicated that copper could be removed through an environmentally friendly process using a low cost biosorbent from an agricultural waste.
268 citations
TL;DR: The potential of anaerobic digestion to degrade antibiotics in livestock manure contributes to a more sustainable and environment-friendly livestock breeding and further investigations are required to assess the degradation of antibiotics during psychrophilic anaer aerobic digestion.
Abstract: Degrading antibiotics discharged in the livestock manure in a well-controlled bioprocess contributes to a more sustainable and environment-friendly livestock breeding. Although most antibiotics remain stable during manure storage, anaerobic digestion can degrade and remove them to various extents depending on the concentration and class of antibiotic, bioreactor operating conditions, type of feedstock and inoculum sources. Generally, antibiotics are degraded during composting > anaerobic digestion > manure storage > soil. Manure matrix variation influences extraction, quantification, and degradation of antibiotics, but it has not been well investigated. Fractioning of manure-laden antibiotics into liquid and solid phases and its effects on their anaerobic degradation and the contribution of abiotic (physical and chemical) versus biotic degradation mechanisms need to be quantified for various manures, antibiotics types, reactor designs and temperature of operations. More research is required to determine the kinetics of antibiotics' metabolites degradation during anaerobic digestion. Further investigations are required to assess the degradation of antibiotics during psychrophilic anaerobic digestion.
205 citations