Snigdha Khuntia

Assistant Professor
PhD (Chemical Engineering), IIT Guwahati
Areas of interest
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

  • Removal of NOX and SOx
  • Ozone based water/wastewater treatment
  • Heavy metal removal from wastewater by chemical process
  • Biosorption of heavy metals
  • Fabrication of ozone contactor
  • Hydrodynamic study of gas bubbles

M.Tech Thesis

Thesis Title: Reduction of hexavalent chromium using Spirilina sp. Biomass (Adviser: Dr. A. K. Golder).

  • Performance of biosorption of Chromium using Spirulina sp. Biomass using batch and column study.
  • Synthesis of algenate + biomass spherical beads and sorption study of Cr(V).
  • Kinetic and thermodynamic study of biosoprtion

Ph.D. Thesis

Thesis Title: Removal of ammonia, arsenic and dyestuff from water by ozone microbubbles (Adviser/s: Prof. Pallab Ghosh and Dr. Subrata K. Majumder).

  • Performance of ozonation of water/wastewater.
  • Mass transfer study of ozonation process.
  • Performance calculation of pilot plants for bubble columns and microbubble systems.
  • Investigation of oxidation mechanism of inorganic pollutants such as ammonia, and arsenic using ozone microbubbles.
  • Investigation of oxidation mechanism of organic pollutants such as azo-dyes using ozone microbubbles.
  • Qualitative and quantitative detection of hydroxyl radicals.
  • Modification of activated carbon based adsorbents, synthesis of zirconium based adsorbents.
  • Characterization of adsorbents to use in As(III) and As(V) adsorption.
  • Modeling of experimental data obtained.

Journal Papers


Book Chapter


  • Khuntia, S., Gagrai, M. K., Das C. and Golder, A. K., Effect of background ions on reduction of Cr (VI) to Cr (III) using saline water algae, Res. J. Chem. Environ., 15, 450−453 (2011).
  • Khuntia, S., Majumder, S. K., Ghosh, P., Enhanced oxidation of ammonia using ozone microbubbles, International Conference on Frontiers in Chemical Engineering (ICFCE-2013), NIT Rourkela, Odisha, India, 351−356, ISBN 978-93-80813-24-0, 09−11 December (2013).
  • Khuntia, S. and Golder, A. K., Hexavalent chromium reduction by immobilized green microalgae in continuous treatment, 2nd International Conference on Algal Biorefinery (ICAB-2014): A potential source of food, feed, biochemicals, biofuels and biofertilizers,  Technical University of Denmark, Lybgby, Denmark, August 27−29 (2014).
  • Khuntia, S., Sinha, M. K.,  Majumder S. K., Ghosh, P., Calculation of hydroxyl radical concentration-An indirect method, International Conference on Advances in Chemical Engineering (ICACE-2015), NITK Surathkal, Karnataka, India, (Accepted) 20−22 December (2015).
  • Sinha, M. K., Khuntia, S., Purkait, M. K., Preparation of Thermo Responsive PSF Ultrafiltration Membrane, with Cross Linked PVCL-co-PSF Copolymer for Easy Cleaning, International Conference on Advances in Chemical Engineering (ICACE-2015), NITK Surathkal, Karnataka, India, 20−22 December (2015).
  • Khuntia, S., Majumder, S. K., Ghosh, P., Oxidation of Arsenic (III) in Ozone Assisted Microbubble System, 7th IWA Aspire Conference, Kuala Lumpur, Malaysia, 11–14 September (2017).


  • Instrumentation and Process Control (2018)
  • Membrane Science and Technology (Chemical) (2017-2018)
  • Heat Transfer (Chemical) (2016-2017)
  • Fluid Mechanics (Chemical and Mechanical) (2016)
  • Power plant and mechanical operation (Chemical and Mechanical) (2015-2017)


  • Chemical Engineering Lab 1  (Chemical) (2015-2018)
  • Heat Transfer Lab (Chemical & Mechanical) (2016-2017)

  • Faculty incharge of the AIChE student chapter of Ahmedabad University

  •       Member of AIChE (American Institute of Chemical Engineers)

  •       Judge of the poster presentation in , CHEMTECH-2018, Ahmedabad 23-25th January 2018.

Reviewer for Journals (From 2015-2018)


Invited Lectures/External thesis evaluator

  • Heat Transfer (Applications in Human Life and Nature), Shroff S.R. Rotary Institute of Chemical Technology, Ankleshwar, Gujarat, 04 May 2016.
  • Nano materials and Application, Marwadi Education Foundation Group of Institutes, Rajkot, Gujarat, 16 September 2016.
  • Invited as the external evaluator for the MTech Project by Department of Chemical Engineering, PDPU Gandhinagar, May 25, 2018.

Simultaneous removal of NOX and SO2 from the flue gas: A low temperature ozone based process


Duration: 3 years


(Any interested candidate can contact through email to for further information)


Project Details

1. Background

Removal of NOX and SO2 from flue gases has been a serious problem for the nation from the past decade. Selective catalytic reduction (SCR) is considered as 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 results in 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, 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

One of the simplest methods for simultaneous removal of NOX and SO2 is the use of hydrogen peroxide to oxidize NOX and SO2 to HNO3 and H2SO4, respectively, followed by absorption in an acidic solution. To increase the removal efficiency of NOX and SO2, hydroxyl radicals (OH•) generated from O3 can be used. Therefore this work aims to enhance the in-situ generation of OH• radicals by using O3+H2O2, O3+UV or O3+catalyst. Thereafter the OH• radical will react with NOX and SO2 simultaneously to form to HNO3 and H2SO4, respectively. These reactions will be carried out at low-moderate temperature. To further enhance the generation of OH• radicals and minimize the ozone/H2O2 usage, catalysts will be developed in this study.
The manganese based catalysts are more suitable for the dissociation of ozone into OH•. Therefore, this work will be focused on developing some suitable Mn-catalyst for catalytic ozonation process. To the best of the author’s knowledge, no work has been reported in India on the simultaneous removal of NOX and SO2 from flue gases using ozone based process.

3. Objective

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
a. O3+H2O2
b. O3+UV
c. O3+catalyst
(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.



234, School of Engineering and Applied Science,
Ahmedabad University,
Ahmedabad Education Society FP. 4,
Near Commerce Six Roads,
Navrangpura, Ahmedabad - 380 009, India


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