1. Centre for Water Management and Reuse, School of Natural and Built Environments, University of South Australia, Mawson Lakes 5095, South Australia, Australia
2. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea, Tel. ; Fax:
3. Centre for Complex Fluid Processing, Systems and Process Engineering Centre, College of Engineering, Swansea University, Swansea SA2 8PP, UK