Agro-industrial waste ‘wheat bran’ for the biosorptive remediation of selenium through continuous up-flow fixed-bed column

Hasan, S. H.; Ranjan, D.; Talat, Mahe

doi:10.1016/j.jhazmat.2010.05.133

Cited by 119 publications

(53 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It assumes plug flow behaviour in the bed [39] and follows the Langmuir kinetics of adsorption. The suitability of the Thomas model may be explained in that this model assumes negligible axial dispersion in the column adsorption since the rate driving force obeys second-order reversible reaction kinetics [40], and considers that sorption is not limited by the chemical reaction, but is controlled by the mass transfer at the interface [41]. The linearised form of the model is given as [42]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Adsorption performance of continuous fixed bed column for the removal of methylene blue (MB) dye using Eucalyptus sheathiana bark biomass

2015

View full text Add to dashboard Cite

In this study, the adsorptive effectiveness of sustainable and cost-effective eucalyptus bark biomass in the removal of methylene blue (MB) dye from its aqueous solution has been tested using a packed bed up-flow column experiment. A series of column experiments using raw eucalyptus bark was performed to determine the breakthrough curves with varying inlet MB dye flow rate (10-15 mL min -1 ), initial MB dye concentration (50-100 mg L -1 ) and adsorbent bed height (10-15 cm). High bed height, low flow rate and high initial dye concentration were found to be the better conditions for maximum dye adsorption. To predict the breakthrough curves and to determine the characteristic parameters of the column dynamics for industrial applications and for process design, Thomas model, Yoon-Nelson model and bed depth service time model were applied to experimental breakthrough data. All models were found suitable for describing the dynamic behaviour of the column, with respect to MB flow rate, initial dye concentration and adsorbent bed height. The findings revealed that eucalyptus bark biomass has a high adsorption potential for the removal of MB dye from aqueous solutions in a column system, and that it could be used to treat dye-containing effluents. List of symbols ACross sectional area of bed in column (cm 2 ) A 1 Used bed area (cm 2 ) A 2 Unused bed area (cm 2 )pollutant concentration (mg/L) C o Inlet pollutant concentration (mg/L) H Height of bed in column (cm) H B Used bed length up to break point (cm) H T Bed height of column (cm) H UNB Unused bed length (cm) K o Rate constant in BDST model (L/mg min) K T Thomas rate constant (mL/mg min) K YN Yoon and Nelson rate constant (min -1 ) MTZ Mass transfer zone (cm) m Amount of adsorbent in the column (g) m p Mass of pine cone (g) m total Total amount of methylene blue dye sent to column (g) N o Adsorption capacity (mg/L) Q Volumetric flow rate (mL/min) q total Total adsorbed methylene blue dye quantity (g) q o Equilibrium adsorbate uptake (mg/g) t Breakthrough (sampling) time (min) t t Total time (min) t total Total flow time (min) t b Usable capacity of bed up to the breakthrough point time (min) t u Time equivalent to usable capacity (min) U Influent linear velocity (cm/min) V Effluent volume (ml) V eff Total effluent volume (mL) s Time required for 50 % adsorbate breakthrough (min)

show abstract

Section: Theoretical Backgroundmentioning

confidence: 99%

Adsorption performance of continuous fixed bed column for the removal of methylene blue (MB) dye using Eucalyptus sheathiana bark biomass

2015

View full text Add to dashboard Cite

show abstract

“…The R 2 value was found to be 0.964 which indicates the validity of BDST model for the packed bed biosorption using nZVI-SS biocomposite. The rate constant k a computed from the intercept of the BDST plot characterizes the rate of solute transfer from the liquid phase to the solid phase [27]. The calculated N 0 and k a were 16.67 mg/L and -9.6514 L/(mg min), respectively, at 10 ml/min and 10 mg/L.…”

Section: Bdst Modelmentioning

confidence: 96%

“…Basically, the rate driving force obeys the second-order reversible reaction kinetics. Therefore, it assumes Langmuir kinetics of adsorption-desorption and negligible axial dispersion in the column adsorption [27]. The linearized form of this model can be described by the following expression,…”

Section: Thomas Modelmentioning

confidence: 99%

Fixed-bed column studies for the removal of hazardous malachite green dye from aqueous solution using novel nano zerovalent iron algal biocomposite

Jerold

Joseph

Patra

et al. 2016

Nanotechnol. Environ. Eng.

View full text Add to dashboard Cite

Sargassum swartzii, a marine alga was used as precursor for the synthesis of novel nano zerovalent iron S. swartzii (nZVI-SS) biocomposite for the removal of malachite green (MG) from simulated wastewater in a fixed-bed column. The performance of the biocomposite was evaluated in the fixed-bed column at various operating conditions such as bed height (3-9 cm), flow rate (5-15 mL/min) and initial MG concentration (5-15 mg/L). The lowest bed height (3 cm), lowest flow rate (5 mL/min) and highest inlet MG concentration (15 mg/L) resulted in highest MG uptake of 0.56 mg/g, compared to other experimental conditions. The column experimental data obtained at different conditions were analyzed using three different models, viz., Adam-Bohart model, Thomas model and Yoon-Nelson model. All three models provided a good breakthrough curve prediction; however, the results obtained from Thomas model and Yoon-Nelson model were more satisfactory. The well-recognized BDST model was also used for describing the effect of bed height on the breakthrough curve. The various characteristics of the biocomposite were studied using SEM, DLS, XRD, XRF and XANES. The nZVI-SS biocomposite fixed-bed column proved to be the potential biosorbent for the removal of MG from aqueous phase.

show abstract

“…While batch reactors are easy for researchers to use in laboratory studies, they definitely are less convenient for pilot-scale work (i.e., industrial applications) [188]. Most of the reported studies on the adsorption of dyes (as well as HM) by AC were conducted in batch mode techniques [123,187].…”

Section: Batch Mode and Fixed-bed Column Techniquesmentioning

confidence: 99%

Low-cost Adsorbents Derived from Agricultural By-products/Wastes for Enhancing Contaminant Uptakes from Wastewater: A Review

Sulyman

Namieśnik

Gierak

2017

Pol. J. Environ. Stud.

209

112

View full text Add to dashboard Cite

A major threat to the comfort of human life has been imposed by increased industrialization and urbanization. The generation and disposal of huge amounts of toxic materials and pollutants have heavily contaminated our environment. Some Organics such as synthetic dyes (SD) and heavy metals (HM) are becoming increasingly prevalent as the most dangerous pollutants in soil and surface water environments. They are causing great concern worldwide due to their toxicity to many life forms.Environmentally friendly utilization of agricultural by-products/waste materials either as raw materials or in production of so-called activated carbons (AC) is an important issue. Because it is apparent from our literature review that the main factors characterizing these materials are their affordability, local availability, and efficiencies in removing many unwanted toxics and pollutants, they therefore could be utilized instead of more conventional but expensive adsorbent materials, particularly in developing countries where many industries lack appropriate individual sewage treatment systems; even where they exist, they lack satisfactory functioning and maintenance because of the lack of good budgets.A number of case studies are supplied in this review. These case studies have pointed to the efficient removal of SD/HM ions from aqueous solutions by the agricultural by-products/wastes in the form of a raw material, signifying spent tea leaves (STL) as a good example. Besides, the efficient removal of such ions by AC produced from these agricultural by-products/wastes has also been given in detail, suggesting a variety of AC agricultural by-products/wastes sources. Both kinds are widely used adsorbents in the treatment of wastewaters. Our review has shown that these adsorbents are characterized by many exceptional physical and chemical features that make them widely used adsorbents in the treatment of wastewaters. The adsorption efficiencies by these substances were also affected by the characteristics of AC, which depend on the physical and chemical properties of the precursor (i.e., agricultural by-products/wastes) as well as on the activation method applied, which is either chemical or physical. The structural properties of the resulting

show abstract

Agro-industrial waste ‘wheat bran’ for the biosorptive remediation of selenium through continuous up-flow fixed-bed column

Cited by 119 publications

References 35 publications

Adsorption performance of continuous fixed bed column for the removal of methylene blue (MB) dye using Eucalyptus sheathiana bark biomass

Adsorption performance of continuous fixed bed column for the removal of methylene blue (MB) dye using Eucalyptus sheathiana bark biomass

Fixed-bed column studies for the removal of hazardous malachite green dye from aqueous solution using novel nano zerovalent iron algal biocomposite

Low-cost Adsorbents Derived from Agricultural By-products/Wastes for Enhancing Contaminant Uptakes from Wastewater: A Review

Contact Info

Product

Resources

About