Entity

Time filter

Source Type


Agarwal S.,Kumarappa National Handmade Paper Institute | Sharma A.,Kumarappa National Handmade Paper Institute | Singh K.,Malaviya National Institute of Technology, Jaipur | Gupta A.B.,Malaviya National Institute of Technology, Jaipur
Desalination and Water Treatment | Year: 2014

Handmade paper utilizes direct dyes for imparting it bright colors to be used in wedding cards, fancy, decorative arts, etc. The effluent of handmade paper industry faces problem of highly colored effluent. The present study aims at decolorization of direct red and direct blue dyes, used abundantly in the industry, with the help of ozonation treatment. The batch studies have been conducted on decolourization of synthetic samples of these dyes at various initial concentrations, temperature, and pH. The effect of these parameters has been studied on decolorization efficiency. The maximum decolorization is achieved at pH of 10 and temperature of 313 K. The equilibrium time of decolorization with ozonation treatment for direct red and direct blue dye for 50 ppm initial concentration was 6 and 4 min, respectively. The kinetics of decolorization was found to be pseudo-first-order type. © 2014 Balaban Desalination Publications. All rights reserved. Source


Saakshy,Kumarappa National Handmade Paper Institute | Singh K.,Malaviya National Institute of Technology, Jaipur | Gupta A.B.,Malaviya National Institute of Technology, Jaipur | Sharma A.K.,Kumarappa National Handmade Paper Institute
Journal of Cleaner Production | Year: 2015

The handmade paper industry utilizes quantum of dyes for making bright colored handmade paper used for wedding cards, fancy and decorative paper, etc. A study has been conducted on adsorption of direct black dye (used extensively in handmade paper industry to make black colored handmade paper) on fly ash obtained from thermal power plant of Yamuna Nagar. The effluent has been characterized for pH, suspended solids, total solids and chemical oxygen demand. The batch and column studies have been conducted on the adsorption of direct black dye solution of different concentrations on fly ash at varying pH, dosage of fly ash, temperature, contact time, particle size fractions of fly ash and initial concentration of dye solution. In batch studies, it was observed that the experimental data fit well with Langmuir adsorption isotherm in comparison to Freundlich and Temkin isotherms. The maximum adsorption capacity of 76.33 mg/g was achieved at 318 K in batch studies. The column experimental data fitted well to Yoon-Nelson model and Thomas model in comparison to Bohart-Adams model. The maximum adsorption capacity of 45.54 mg/g in column study was obtained for 2.4 cm bed height, 150 ppm inlet concentration and 1.6 mL/min flow rate of dye solution. The calculations of thermodynamic parameters indicate that the adsorption of black dye on fly ash is spontaneous and endothermic in nature and follows first order kinetics with rate constant of 0.201 min-1. It has been found that fly ash is a potential low cost adsorbent to treat effluent of handmade paper industry. The exhausted fly ash can be further reused as filler in paper making and hence can offer a viable closed loop solution in curbing pollution from this predominantly small sector industry. © 2015 Elsevier Ltd. Source


Agarwal S.,Kumarappa National Handmade Paper Institute | Yadav S.,Banasthali University | Sharma A.,Kumarappa National Handmade Paper Institute | Singh K.,Malaviya National Institute of Technology, Jaipur | Gupta A.B.,Malaviya National Institute of Technology, Jaipur
Desalination and Water Treatment | Year: 2016

Handmade paper is famous for its bright color made by single dye or admixture of dyes. Handmade paper industry emits colored effluent which requires cost-effective treatment technologies. In the scope of the present paper, studies have been conducted with a simulated dye solution having a mixture of dyes being used in the handmade paper industry. The original fly ash and adsorbed fly ash were characterized for SEM-EDX, XRD, and Fourier transform infrared (FTIR) studies. The FTIR studies of direct dyes used in mixture (direct orange, direct navy blue, and direct violet dye) were conducted. The batch studies were conducted with low-cost fly ash and various affecting parameters, i.e. pH, initial concentration, temperature of the dye solution, dosage, and particle size of fly ash. The maximum adsorption capacity of fly ash was found to be 120.48 mg/g with fly ash dosage of 40 g/L having particle size of 45–75 μm with dye solution at pH 2 and 40°C temperature. The better coefficient value of R2 showed better fitting of the Langmuir isotherm with the experimental data. The kinetic sorption data are well represented by the pseudo-second-order kinetics for the entire sorption period. The change in enthalpy, entropy, and free energy were evaluated which indicated that the sorption process is endothermic, spontaneous, and feasible. The characteristics of the effluent of handmade paper industry after fly ash treatment in batch study confirm the acceptability of the use of fly ash for treatment of effluent of handmade paper industry. © 2016 Balaban Desalination Publications. All rights reserved. Source

Discover hidden collaborations