|1. Membrane Separation Technology:|
|My research activity encompasses both understanding of fundamental principles during filtration as well as the development of technology based on membrane separation. In particular, my research areas are modeling of microfiltration, ultrafiltration, nanofiltration, reverse osmosis, treatment of oily wastewater, tannery effluent using membrane based processes. We are exploring the detailed quantification of flux decline from fundamentals. As an offshoot of the major research, we are fabricating ceramic membranes using low cost precursors as sawdust. Catalyst is coated on the ceramic support for manufacturing catalytic membrane reactor. A membrane based technology for recovery of organic solvent from coal-solvent mixture is developed. Recovered organic solvent is again reused for improvement of coal properties in subsequent extraction stages. A low cost ceramic membrane is developed from steel industry waste iron ore slime (IOS) and is applied to recover organic solvent from coal-solvent mixture. Focus is also given on the membrane ultrafiltration technique to separate Humic acids, heterogeneous and polyfunctional polymers formed by microbial decay from plant and animal residues, from water solution. Preparation of electrospun nanofiber membranes using electrospinning technique; afterward, the potential of prepared nanofiber membranes for adsorption, membrane separation and both of heavy metals and other contaminants like; Cu, Pb, Cr, Hg, Ni, Cd, As, F- etc. from drinking water and wastewater will be investigated.|
|2. Spirulina Platensis for Decontamination of Chromium Laden Aqueous Effluent:|
|The applicability of Spirulina platensis, a blue-green microalgae, for the removal of both Cr(III) and Cr(VI) in batch reactor is tested. Uptake capacity and the mechanisms of different forms of chromium binding into Spirulina platensis are determined. A second order kinetic model is developed for the reduction of Cr(VI) into Cr(III). The feasibility of precipitated chrome tanning effluent (PCTE) for the cultivation of Spirulina sp. is also investigated to utilize its Cl- resource.|
|3. Studies on Extraction and Purification of Value Aided Chemicals from Stevia and Aloe Vera:|
RA is a natural sweetener found in Stevia leaves. It is around 450 times sweeter than sucrose. The RA extract also contents many medicinal properties. Extraction of RA is performed by green solvent, water which shows considerable extraction efficiency. Water extraction reduces the cost since it eliminates the organic extraction of RA as well as eliminates number of unit operations. After successful extraction of RA, it is concentrated by membrane filtration followed by final moisture removing to make it in dry product.
Aloe Vera is a medicinal plant. It is mainly used for burn healing and skin aliment. Our main purpose is to make the Aloe Vera gel in completely dry form in such a way that it contents all of its medicinal properties. To achieve this goal, we are studying various drying processes and are comparing their physicochemical properties
|4. Supercritical Fluid Extraction of Natural Antioxidants for Food Preservation from Spices Endemic in North Eastern Region of India:|
|North Eastern Region (NER) as a whole can be considered as treasure house of ginger diversity. The bioactive compounds extracted from these plants could find their use in Nutraceuticals, a food or food product that provides health and medical benefits, including the prevention and treatment of disease. Therefore it is proposed to develop the process to isolate antioxidant compounds from these spices and encapsulate using supercritical fluid (SCF) Technology. The project will undertake collection of number of accessions/ attainments for the above crops from diverse locations in NER and would identify superior accession with high antioxidant activity through an integrated approach. Standardization of SCFE process for extraction, purification and encapsulation of natural antioxidants from different parts of the crops will be performed. Black rice is a most important underutilized crop of north-east India. In general, black rice contains high amount of bioactive compounds than other conventional rice, hence profile of bioactive compounds, namely, total phenolics, flavonoids, tocopherol will be studied extensively. After identification of bioactive compounds, the compound will be extracted using supercritical fluid extraction and to increase the heat stability of the extracted bioactive compounds, the extract will be encapsulated. To study the feasibility and stability of encapsulated compound, a value added extrudate product will be developed.|
Key Research Areas : Wastewater Treatment, Bioremediation, Membrane based Separation Process.
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