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Shreyashi Sarkar

Bio: Shreyashi Sarkar is an academic researcher from University of Calcutta. The author has contributed to research in topics: Packed bed & Metal ions in aqueous solution. The author has an hindex of 2, co-authored 3 publications receiving 23 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the technical feasibility of rice husk ash for adsorptive removal of Cr(VI) and Cu(II) is examined in packed bed from aqueous solutions.
Abstract: In this present study, the technical feasibility of rice husk ash for adsorptive removal of Cr(VI) and Cu(II) is examined in packed bed from aqueous solutions. The effects of different operating parameters such as height of the packed bed column (5–15 cm), flow rate of aqueous metal ion solution (10–30 ml min−1), and initial metal ion concentration (10–30 mg L−1) were studied. Capacity of the bed to absorb metal ions was found to increase with an increase in bed height, decrease in flow rate, and metal ion concentration. Adams–Bohart, Yoon–Nelson, and Thomas models were applied to the experimental data for the prediction of breakthrough point and also to determine the model parameters to characterize the column. The Yoon–Nelson model and Thomas model were applicable for Cr(VI) removal, and for Cu(II), Thomas model was suited.

22 citations

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TL;DR: Yan et al. as discussed by the authors investigated the packed bed column study using coconut shell and neem leaf for the removal of Hexavalent chromium from aqueous solution and reported the breakthrough characteristics for Cr(VI) removal.
Abstract: The packed bed column study was investigated using coconut shell and neem leaf for the removal of Cr(VI) from aqueous solution. The breakthrough characteristics for Cr(VI) removal was reported. The effect of operating parameters like influent Cr(VI) concentration, bed height of the packed column and the flow rate of aqueous solution on the breakthrough curve was studied. Bohart-Adams, Yoon-Nelson, Thomas model,Yan et al. model and Wolborska model were applied to the experimental data for their suitability. Keywords— Hexavalent chromium removal, Column study, Yoon-Nelson model, Thomas model, Adams-Bohart model Introduction

11 citations

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TL;DR: In this article, the influence of different process parameters in a fixed-bed on the removing efficiency has been investigated and the results show that the removal efficiency is higher at a minimum flow rate, low metal ion concentration, and higher bed height.

6 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the effect of various mineral additives on the mechanical, durability and microstructure properties of concrete and geopolymer mixtures was summarized and the results advocate that mixtures with desired properties can be designed for ambient temperature curing condition with minerals additives which may further promote them as an environmentally friendly construction material.

125 citations

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TL;DR: In this paper, a scale-up design for Cr(VI) removal using walnut shell as an adsorbent and its economic feasibility are done to find out its applicability in real life.

90 citations

Journal ArticleDOI
TL;DR: These adsorbents have an excellent potential and are useful for water treatment particularly small- and medium-sized industries of third world countries, as breakthrough time and exhaustion time are longer in comparison to peanut shell.
Abstract: Cr(VI) is a toxic water pollutant, which causes cancer and mutation in living organisms. Adsorption has become the most preferred method for removal of Cr(VI) due to its high efficiency and low cost. Peanut and almond shells were used as adsorbents in downflow fixed bed continuous column operation for Cr(VI) removal. The experiments were carried out to scrutinise the adsorptive capacity of the peanut shells and almond shells, as well as to find out the effect of various operating parameters such as column bed depth (5–10 cm), influent flow rate (10–22 ml min−1) and influent Cr(VI) concentration (10–20 mg L−1) on the Cr(VI) removal. The fixed bed column operation for Cr(VI) adsorption the equilibrium was illustrated by Langmuir isotherm. Different well-known mathematical models were applied to the experimental data to identify the best-fitted model to explain the bed dynamics. Prediction of the bed dynamics by Yan et al. model was found to be satisfactory. Applicability of artificial neural network (ANN) modelling is also reported. An ANN modelling of multilayer perceptron with gradient descent and Levenberg-Marquardt algorithms have also been tried to predict the percentage removal of Cr(VI). This study indicates that these adsorbents have an excellent potential and are useful for water treatment particularly small- and medium-sized industries of third world countries. Almond shell represents better adsorptive capacity as breakthrough time and exhaustion time are longer in comparison to peanut shell.

41 citations

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TL;DR: In this article, a study was performed in fixed bed downflow columns at multiple flow rates, bed depths, and influent concentrations for Cr(VI) elimination using the above green adsorbents.

39 citations

Journal ArticleDOI
TL;DR: In this article , the performance and applicability of several adsorptive materials for hexavalent chromium (Cr(VI) removal from aqueous media are discussed, along with a detailed analysis of the mechanisms involved.

38 citations