Visiting professor/Scholar: 1. Visiting professor (9 -30 June 2012), University of Hyogo, Hyogo, Japan. 2. Visiting Scholar (Dec 2013‐ Feb 2014), University of Hyogo, Hyogo, Japan. 3. Visiting professor (26 June -27 July 2017), University of Hyogo, Hyogo, Japan. 4. Visiting Scholar (, Dec 2017‐January 2018) University of Hyogo, Hyogo, Japan. 5. Visiting Scholar (4-16 Feb 2018), Tokyo Institute of Technology, Tokyo, Japan.

• Wastewater treatment • Solar photo-catalyst development • Algae photo-bioreactors development • Biodiesel Production, • Biofilteration, VOC biodegradation • Bioreactor design, modeling, and scale up: slurry airlift bioreactors, slurry bubble columns, stirred fermenters. • Chemical & biochemical reaction engineering • Heterogeneous and homogeneous catalysis