Research Interests: Advanced Oxidation Processes, Wastewater Treatment, Biosorption.
Dr. Snigdha Khuntia is working as Assistant Professor at School of Engineering and Applied Science (SEAS), Ahmedabad University. She has done her B.Tech in Chemical Engineering from IGIT Sarang, BPUT Orissa. Snigdha has done her M.Tech and Ph.D in Chemical Engineering from Indian Institute of Technology Guwahati (IITG). Her research areas are advanced oxidation processes, ozone based water/wastewater treatment, biosorption, adsorption, heavy metal removal from wastewater. Additional research includes mass transfer study of ozone, oxygen using millibubbles and microbubbles, kinetics and decomposition of ozone in water, synthesis of adsorbents for metal removal.
Current Research Interests
Thesis Title: Reduction of hexavalent chromium using Spirilina sp. Biomass (Adviser: Dr. A. K. Golder).
Thesis Title: Removal of ammonia, arsenic and dyestuff from water by ozone microbubbles (Adviser/s: Prof. Pallab Ghosh and Dr. Subrata K. Majumder).
Simultaneous removal of NOX and SO2 from the flue gas: A low temperature ozone based process
Funding Organisation: DST_SERB (EARLY CAREER RESEARCH GRANT)
Duration: 3 years
CURRENT REQUIREMENT: NIL
Removal of NOX and SO2 from flue gases has been a serious problem for the nation since two decades. Selective catalytic reduction (SCR) is considered as one of the most effective method for removal of NOx and studied extensively. Simultaneous removal of SO2 and NOX can be achieved by a combination of wet flue gas desulfurization (WFGD) and SCR. But the individual treatment strategy poses expensive investment and operating cost. To overcome these limitations, various new methods have been proposed such as wet scrubbing, adsorption, electron beam irradiation, corona discharge, dielectric barrier discharge, radio frequency discharge, and electrochemical-catalytic cells etc. Except wet scrubbing and adsorption process, the other methods mentioned above require high cost of energy. Wet scrubbing process is performed under ambient temperature and it is highly adaptable to various flue gas loads. At the same time it results in high volume of liquid wastes and lower efficiency.
2. Summery of project
To overcome the above limitations, simultaneous removal of NOX and SO2 can be achieved by using hydrogen peroxide and convert NOX and SO2 to HNO3 and H2SO4, respectively. In addition to that, to increase the removal efficiency of NOX and SO2, Reactive oxygen species (such as OH• radicals) generated from O3 would be useful. Therefore this work aims to enhance the in-situ generation of OH• radicals by using O3+H2O2, O3+UV or O3+catalyst. These reactions are carried out at low-moderate temperature. To further enhance the generation of OH• radicals and minimize the ozone/H2O2 usage, suitable catalysts are developed. The manganese based catalysts are more suitable for the dissociation of ozone into OH•.
The objective of this work is to develop a more efficient method for the simultaneous removal of NOX and SO2 from flue gases. The specific objectives are
(i) To increase the rate of formation of hydroxyl radicals by using
(ii) Development of catalysts to increase the formation of hydroxyl radicals from ozone
(iii) Simultaneous removal of NOX and SO2 for a wide range of concentration by hydroxyl radicals
(iv) Conversion of NOX and SO2 into useful products such as HNO3 and H2SO4.