|1984-2001||Lecturer/Senior Lecturer/Reader in Biochemical Engineering, Chemical Engineering Department, Imperial College London|
|1983||Visiting Fellow, Science Policy Research Unit (SPRU), and the Institute of Development Studies (IDS), Iniversity of Sussex, UK.|
|1981-1982||Research Fellow, EAWAG, Zurich, Switzerland.|
|1980||Post-Doctoral Fellow, SINTEF/NTH, Trondheim, Norway.|
|1974-1980||PhD in Civil Eengineering, Stanford University, California, USA.|
|1973||MEng(Sci) Biochemical Engineering, University of Melbourne, Australia.|
|1970-1972||Environmental Engineer, State Rivers, Melbourne, Australia.|
|1966-1969||BEng Chemical Engineering, University of Melbourne, Australia.|
My research interests fall into three seemingly disparate but ultimately inter-related areas:
- Anaerobic Wastewater Treatment : Treatment of dilute (500 mg/l COD) and heavy metal/dye containing wastes using a "Baffled Reactor" (ABR). Production, characterisation and removal of soluble microbial products (SMPS) from anaerobic digester effluents. Sulphate reduction to disinfect and remove metals from sludges. Use of solid-phase gas membrane separation in anaerobic digestion to control shock loads. The use of 16S rRNA molecular probes to understand the microbial ecology of anaerobic reactors. In addition, I am looking at immobilised (in PVA) nitrification/denitrification for high ammonia (1000 mg/l) wastewaters in gas-lift reactors.
- Downstream Separations in Biotechnology : Selectivity, activity recovery, kinetics and contactor design (Graesser) using reverse micelles (5 nanometer w/o microemulsions) to extract proteins from fermentation broths. Colloidal liquid aphrons (CLAs-5 micron o/w emulsions) to extract non-polar (erythromycin) and polar (phenylalanine) solutes from broths. Interfacial mass transfer in solvent extraction in the presence of proteins/surfactants and cell debris looking at Marangoni instabilities. Extraction of eicosapentanoic Acid (EPA) from marine algae using solvent extraction, silver ion chromatography, and solid phase membrane/silver ion extraction.
- Biotransformations : production of chiral epoxides in solid-phase membrane bioreactors. Biphasic enzymatic reactions on colloidal liquid aphrons, as well as the development of crossflow membrane reactors with CLAs.
et al., 2010, Are Compatible Solutes Compatible with Biological Treatment of Saline Wastewater? Batch and Continuous Studies Using Submerged Anaerobic Membrane Bioreactors (SAMBRs), Environmental Science & Technology, Vol:44, ISSN:0013-936X, Pages:7437-7442
et al., 2008, Integrated model of the production of soluble microbial products (SMP) and extracellular polymeric substances (EPS) in anaerobic chemostats during transient conditions, Biochemical Engineering Journal, Vol:38, ISSN:1369-703X, Pages:138-146
et al., 2008, Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC), Process Biochemistry, Vol:43, ISSN:1359-5113, Pages:93-102
et al., 2009, Continuous treatment of the organic fraction of municipal solid waste in an anaerobic two-stage membrane process with liquid recycle, Water Research, Vol:43, ISSN:0043-1354, Pages:2449-2462