Australian Centre for Water
and Environmental Biotechnology

AWMC Seminar Program: Dr Katrin Doederer & Dr Keshab Sharma

Dr Katrin Doederer: Drinking Water Treatment in South East Queensland – current challenges & research projects

In South East Queensland (SEQ) drinking water treatment currently takes place at 46 locations. The most widely applied water treatment process – known as conventional treatment – is a combination of coagulation, flocculation, sedimentation and filtration, and is used by the majority of Seqwater’s treatment facilities. Innovative technologies are becoming more important to meet and enhance the removal of organic matter, disinfection by-product precursors, and contaminants, e.g. taste and odour compounds and Manganese. Advanced water treatment – comprising conventional treatment plus additional process streams such as ozonation and biological activated carbon (BAC) filtration is used at three locations. Located in a subtropical climate some water treatment plants face challenges associated with some raw water sources. Currently research is done on extending the life of BAC while biofiltration and ion exchange are evaluated as innovative technologies for meeting water quality demands in SEQ most challenging water matrices.


Dr Keshab Sharma: Title: Sewer sediments and their contribution to hydrogen sulfide and methane production

Sewer sediment processes have been reported to significantly contribute to overall sulfide and methane production in sewers, at a scale comparable to that of sewer biofilms. The physiochemical and biological characteristics of sewer sediments being heterogeneous in nature, great variability of in-sediment sulfide and methane production rates is expected among sewers operating under different physical conditions and hydraulic regime. Exact nature of this variability has not been fully understood yet. In this study, five sewer sediment samples were collected from two cities in Australia with different climatic conditions. Batch assays were conducted to determine the rates of sulfate reduction and methane production under different mixing conditions (shear stress) including the completely mixed ones. The tests showed substantial and variable sulfate reduction and methane production activities among different sediments. Both the sulfate reduction and methane production were confirmed to be the areal processes, and both were dependent on flow velocity/shear stress. Despite the variations in the characteristics and reaction kinetics, the sulfate reduction and methane production processes in all sediments could be well described by a one-dimensional sewer sediment model recently developed based on results obtained from a laboratory sewer sediment reactor operation. Model simulations indicated that the in-situ contribution of sewer sediment emissions could be estimated without the requirement of measuring the specific sediment characteristics or the sediment depths. This presentation will cover both the experimental and the modelling results.

Event Details
Date & Time: 
Friday, 04 December 2015
9am - 10am
Venue: AIBN Building 75, Level 1 Seminar Room

Event Contact: