Uttariya Roy

Scopus Publications

Adsorption of Safranin O on halloysite nanotubes: a mechanistic case study for efficient wastewater remediation
Shajeeya A. Shaik, U. Roy, S. Sengupta, and A. Goswami
Springer Science and Business Media LLC

Production, Purification and Characterization of a Novel Thermostable Caffeine Dehydrogenase from Pichia manshurica Strain CD1 Isolated from Kombucha Tea
R. Parvin, S. Bhattacharya, S. Som Chaudhury, U. Roy, J. Mukherjee, and R. Gachhui
Pleiades Publishing Ltd

Coconut coir–derived nanocellulose as an efficient adsorbent for removal of cationic dye safranin-O: a detailed mechanistic adsorption study
Venkatalakshmi Jakka, Anandarup Goswami, Anil Kumar Nallajarla, Uttariya Roy, Koigoora Srikanth, and Shubhalakshmi Sengupta
Springer Science and Business Media LLC

Treatability study of Carcinogenic Waste and its Assessment of Environmental Risk
Swapnila Roy and Uttariya Roy
Asian Research Association
Carcinogenic as well as chemotherapeutic waste is potential hazard to the environment because it is a type of toxic waste according by EPA (Environmental Protection Agency). The procedure of disposal of carcinogenic waste inside hospital, chemical industry and pharmaceutical industry is important concern for our society. The contribution from the Indian Judiciary in its own way to bring effective legal control of these hazardous substances and waste. Moreover, the problems related to judicial issues in tackling the technical issues and the executive inaction make it inevitable to have a separate system of administration of environmental justice and supervisory system so that our environment will be protected. The present paper investigates the treatability study of carcinogenic waste and its assessment of associated environmental risk according to the Indian hazardous substances and waste laws.

Remarkably high Pb<sup>2+</sup> binding capacity of a novel, regenerable bioremediator Papiliotrema laurentii RY1: Functional in both alkaline and neutral environments
Avishek Mukherjee, Soumyadev Sarkar, Rubia Parvin, Debbethi Bera, Uttariya Roy, and Ratan Gachhui
Elsevier BV
The ability of P. laurentii strain RY1 to remediate lead (Pb2+) from water was investigated in batch and column studies. The lead removal ability of non-viable biomass, non-viable biomass immobilised on agar-agar (biobeads) and agar-agar at different pH was compared in batch studies. It was found that among the three, biobeads have maximum ability to remove Pb2+ followed by biomass and agar-agar beads. Maximum and almost equal lead removal by biobeads was observed at both neutral and alkaline pH making it a novel and more applicable bioremediator as all other reported bioremediators have a single pH for optimum activity. Studies were performed to determine the optimum conditions for lead removal from aqueous solutions for biobeads. The physical and chemical characterization of the biobeads before and after Pb2+ biosorption was done by using S.E.M. and F.T.I.R. respectively. The adsorption of Pb2+ on biobeads obeyed the Langmuir adsorption isotherm and pseudo first order kinetics. These mean that the Pb2+ binding sites are identical, located on the surface of the adsorbant and the rate of Pb2+ removal from aqueous solution is directly proportional to the number of Pb2+ binding sites on the biobeads. The thermodynamics of the biosorption process is also investigated. The binding capacity of the biobeads in batch study was found to be 52.91mg/gm which is higher in comparison to other reported yeast bioremediators. The used biobeads can be desorbed using 0.1(M) CaCl2. The desorbed biobeads can be used subsequently for several cycles of lead removal making it cost-effective. Column studies were also performed for biobeads with the help of Thomas model for examining its suitability for industrial application. Maximum specific lead uptake of the biobeads when applied in the column was found to be 58.26mg/gm which being promising makes it suitable for application in industries involved in the treatment of wastewater contaminated with high amounts of lead. The high mass transfer co-efficient indicate that small sized column can be used effectively to remove high amounts of lead which makes the bioremediation process by the biobeads more economical and advantageous for industrial application. Several factors like effectiveness of the biobeads in Pb2+removal at both neutral and alkaline pH, reusability, high mass transfer co-efficient, regenerability and high binding capacity makes it a novel versatile, cost-effective and high utility bioremediator.

Manufacturing of Biodegradable Poly Lactic Acid (PLA): Green Alternatives to Petroleum Derived Plastics
Shubhalakshmi Sengupta, Suvendu Manna, Uttariya Roy, and Papita Das
Elsevier

Membrane processes for removal of polyaromatic hydrocarbons from wastewater
S.R. Barman, U. Roy, P. Das, and A. Mukhopadhayay
Elsevier

New Bioremediation Technologies to Remove Heavy Metals and Radionuclides
Shubhalakshmi Sengupta, Uttariya Roy, Shamik Chowdhary, and Papita Das
Springer Singapore

Removal of Pb (II), As (III), and Cr (VI) by nitrogen-starved Papiliotrema laurentii strain RY1
Soumyadev Sarkar, Avishek Mukherjee, Rubia Parvin, Subhadeep Das, Uttariya Roy, Somdeep Ghosh, Punarbasu Chaudhuri, Tarit Roychowdhury, Joydeep Mukherjee, Semantee Bhattacharya,et al.
Wiley
Heavy metals such as lead, chromium, and metalloid like arsenic dominate the pinnacle in posing a threat to life. Being environment‐friendly, elucidating the mechanism by which microorganisms detoxify such elements has always been an active field of research hitherto. In the present study, we have investigated the capability of nitrogen‐deprived Papiliotrema laurentii strain RY1 toward enhanced tolerance and neutralizing toxic elements. There were biosorption and bioprecipitation of lead and chromium at the cell surfaces. Bioprecipitation mechanisms included the formation of lead phosphates and pyromorphites from lead, grimaldite from chromium. Transcripts such as metallothionein, aquaporins, and arsenical pump‐driving ATPase have been surmised to be involved in the detoxification of elements. Furthermore, activation of antioxidant defense mechanisms for the cells for each of the elements should contribute towards yeast's propagation. The efficiency of removal of elements for live cells and immobilized cells were high for lead and chromium. To the best of our knowledge, this is the first report of such high tolerance of lead, arsenic, and chromium for any yeast. The yeast showed such varied response under dual stress due to nitrogen starvation and in the presence of respective elements. The yeast possesses promising potentials in nitrogen deprived and enriched environments to aid in bioremediation sectors.

Treatment of azo dye (congo red) solution in fluidized bed bioreactor with simultaneous approach of adsorption coupled with biodegradation: optimization by response surface methodology and toxicity assay
Uttariya Roy, Papita Das, and Avijit Bhowal
Springer Science and Business Media LLC
This research work aims to investigate the removal of congo red dye by an integrated approach using immobilized microorganism on fly ash in a fluidized bed bioreactor. This reactor offers the advantage of less retention time, high biomass concentration and no bed clogging. The experiments were also carried out in batch mode of operation. Biodegradation of azo dye was ascertained by Fourier-transform infrared spectroscopy. Experimental parameters of azo dye removal were optimized by response surface methodology using central composite design. At optimized operational parameters, dye removal efficiency was determined to be 98.2%. The dye removal was higher in fluidized bed bioreactor than that obtained in a batch reactor. This along with the results of phytotoxicity analysis using Cicer arietinum (Chick pea) seeds indicated that fluidized bed bioreactor is ecologically favourable application for sufficient detoxification of wastewater using immobilized bacterial species.

Assessment on the decolourization of textile dye (Reactive Yellow) using Pseudomonas sp. immobilized on fly ash: Response surface methodology optimization and toxicity evaluation
Uttariya Roy, Shubhalakshmi Sengupta, Priya Banerjee, Papita Das, Avijit Bhowal, and Siddhartha Datta
Elsevier BV
This study focuses on the investigation of removal of textile dye (Reactive Yellow) by a combined approach of sorption integrated with biodegradation using low cost adsorbent fly ash immobilized with Pseudomonas sp. To ensure immobilization of bacterial species on treated fly ash, fly ash with immobilized bacterial cells was characterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and fluorescence microscopy. Comparative batch studies were carried out using Pseudomonas sp, fly ash and immobilized Pseudomonas sp on flyash and were observed that immobilized Pseudomonas sp on flyash acted as better decolourizing agent. The optimized pH, temperature, and immobilized adsorbent dosage for highest percentage of dye removal were observed to be pH 6, 303 K, 1.2 g/L in all the cases. At optimum condition, the highest percentage of dye removal was found to be 88.51%, 92.62% and 98.72% for sorption (flyash), biodegradation (Pseudomonas sp) and integral approach (Pseudomonas sp on flyash) respectively. Optimization of operating parameters of textile dye decolourization was done by response surface methodology (RSM) using Design Expert 7 software. Phytotoxicity evaluation with Cicer arietinum revealed that seeds exposed to untreated dye effluents showed considerably lower growth, inhibited biochemical, and enzyme parameters with compared to those exposed to treated textile effluents. Thus this immobilized inexpensive technique could be used for removal of synthetic dyes present in textile wastewater.

Integral approach of sorption coupled with biodegradation for treatment of azo dye using Pseudomonas sp.: batch, toxicity, and artificial neural network
Uttariya Roy, Shubhalakshmi Sengupta, Papita Das, Avijit Bhowal, and Siddhartha Datta
Springer Science and Business Media LLC
The present study investigated the removal of azo dye (crystal violet) by adsorption (using a low-cost adsorbent fly ash), biodegradation (using bacterial species, Pseudomonas sp.), and an integrated approach of sorption coupled with biodegradation (using fly ash immobilized with Pseudomonas sp.) on a comparative scale. To ascertain immobilization of bacteria on fly ash, immobilized bacterial cells were characterized by energy-dispersive X-ray spectroscopy, scanning electron microscopy, Fourier-transform-infrared spectroscopy, and fluorescence microscopy. Batch studies were conducted for optimization of the process parameters for ensuring maximum dye removal. The optimum pH, temperature, and initial dye concentration for the highest percentage of dye removal were found to be pH 7, 37 °C, and 50 mg/L in all the three cases. Under optimized conditions, the highest percentage of dye removal was found to be 89.24, 79.64, and 99.04% for biodegradation, sorption, and integrated approach of sorption and biodegradation, respectively. Finally, phytotoxicity studies carried out with the treated water on Cicer arietinum seeds also carried proved that these processes and the adsorbent did not exert any toxic effects on the seeds. Artificial neural network modeling revealed a close interaction between theoretically predicted and experimentally obtained results and with an error of around 1.1%. Thus, this novel, environmentally sustainable and economically viable technique may be applied for effective removal of crystal violet from industrial wastewater.

Enhanced degradation of ternary dye effluent by developed bacterial consortium with RSM optimization, ANN modeling and toxicity evaluation
Priya Banerjee, Shramana Roy Barman, Dolanchapa Sikdar, Uttariya Roy, Aniruddha Mukhopadhayay, and Papita Das
Desalination Publications

Uttariya Roy

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Scopus Publications