Treatment and management of sewage and industrial sludge
Agro-industrial waste management
Site remediation (soil, sediment, ground water)
Hazardous waste management using thermal processes
Participation in Research Programs and Projects
“Gasification-based syngas upgrading and purification system for enhanced power generation (WtE-CRP 1501 105)”, Funding: National Environment Agency (NEA), Singapore, Period: 2016-2019
“Pyrolysis of flexible laminate waste for oil and carbon nanotubes production”, Funding: Nestle, Period: 2018-2019
“Advanced combustion and corrosion control system for steam boilers in WtE gasification plants (WtE-CRP 1701 105)”, Funding: National Environment Agency (NEA), Singapore, Period: 2018-2021
“Feasibility study on slag re-utilisation in Singapore context”, Funding: JFE Engineering Corporation, Period: 2018-2021
Distinctions and Awards
2018 – First Aid Award (Nanyang Technological University)
2016 – Top cited paper in Applied Energy
2013 – ProSPER.Net Leadership Program (Honolulu, Hawaii, USA)
2003 – Marie-Curie Fellowship (Environmental Technology and Energy Economy, Technical University of Hamburg-Harburg, Germany)
Udayanga C.W.D., Veksha A., Giannis A., Lisak G., Lim T.-T. (2019) Effect of sewage sludge organic and inorganic constituents on the properties of pyrolysis products. Energy Conversion and Management, 196, 1410 – 1419.
Udayanga C.W.D., Veksha A., Giannis A., Liang Y.N., Lisak G., Hu X., Lim T.-T. (2019) Insights into the speciation of heavy metals during pyrolysis of industrial sludge. Science of the Total Environment, 691, 232 – 242.
Phua Z.H., Giannis A., Dong Z.-L., Lisak G., Ng W.J. (2019) Characteristics of incineration ash for sustainable treatment and reutilization. Environmental Science and Pollution Research, 26(17), 16974 – 16997.
Chan W.P., Veksha A., Lei J., Oh W.D., Dou X., Giannis A., Lisak G., Lim T.-T. (2019) A hot syngas purification system integrated with downdraft gasification of municipal solid waste. Applied Energy, 237, 227 – 240.
Udayanga C.W.D., Veksha A., Giannis A., Lisak G., Chang V.W-C., Lim T.-T. (2018) Fate and distribution of heavy metals during thermal processing of sewage sludge. Fuel, 226, 721 – 741.
Veksha A., Giannis A., Oh W.D., Lisak G. (2018) Catalytic processing of non-condensable pyrolysis gas from plastics: Effects of calcium supports on nickel-catalyzed decomposition of hydrocarbons and HCl sorption. Chemical Engineering Science, 189, 311 – 319.
Oh W.D., Lisak G., Webster R., Liang Y.-N., Veksha A., Giannis A., Moo J.G.S., Lim J.-W., Lim T.-T. (2018) Unravelling the thermolytic transformation of lignocellulosic biomass waste to redox-active carbocatalyst: Durability of surface active sites. Applied Catalysis B: Environmental, 233, 120 – 129.
Veksha A., Giannis A., Chang V.W.C. (2017) Conversion of non-condensable pyrolysis gases from plastics into carbon nanomaterials: Effects of feedstock and temperature. Journal of Analytical and Applied Pyrolysis, 124, 16 – 24.
Menon A., Wang J.-Y., Giannis A. (2017) Optimization of micronutrient supplement for enhancing biogas production from food waste in two-phase thermophilic anaerobic digestion. Waste Management, 59, 465 – 475.
Tong H.H., Yin K., Ge L., Giannis A., Chuan V.W.L., Wang J.-Y. (2015) Monitoring transitory profiles of leachate humic substances in landfill aeration reactors. Journal of Hazardous Materials, 287, 342 – 348.