1. Civil Engineering, School of Engineering, College of Science and Engineering, University of Galway, Galway H91 TK33, Ireland
2. Combustion Chemistry Centre, School of Biological and Chemical Sciences, Ryan Institute, University of Galway, Galway H91 TK33, Ireland
3. School of Energy and Power Engineering, Beihang University, Beijing 100191, China
4. Department of Microbiology, University of Galway, Galway H91 TK33, Ireland
5. Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
6. School of Physics, Trinity College Dublin, Dublin 2, Ireland