1. Department of Engineering Technology, Cullen College of Engineering, University of Houston, Sugarland, TX 77479, USA
2. Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA 23529, USA
3. Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI 48824, USA
4. Microbial Technology and Biorefining, Centre for Renewable and Low Carbon Energy, Cranfield University, MK43 0AL, UK