Wastewater and sludge characterisation; organic carbon and biological nutrients removal;  suspended and attached growth systems (conventional activated sludge, BNR, SBR, RBC, Biomembranes); sludge characteristics and settling properties; filamentous organisms and bulking; anaerobic processes for sludge treatment; on site and small scale mechanical and natural treatment systems; tertiary and advanced treatment and disinfection; co-treatment of industrial and domestic wastewaters; treatment of leachates, septage and strong wastewaters.

Selected Research Projects.