Water Journal : Water Journal March 2011
technical features 72 MARCH 2011 water • Concrete coupons with common internal coating systems have been prepared and installed with the concrete coupons both in the laboratory corrosion chambers and the field sites at Sydney, Melbourne and Perth. • Standard protocols for the physical, chemical and biological analysis of corrosion processes of concrete and coatings have been established using biological and physical samples from sewers. • A new understanding of the microbial community contributing to the corrosion of concrete pipes is being revealed through modern gene amplicon sequencing (PyroTags) and phylogenetic analysis. • A photogrammetric method for measuring corrosion both in the lab and in situ in the field has been developed for rapid and accurate measurement of corrosion. Theme 2 -- Gas Phase Technologies • An industry survey has been conducted and a report prepared on the methods used by Australian industry for monitoring and analysis of sewer odorants, with recommendations for improvements. • An industry survey has been conducted and a report prepared on the odour abatement technologies used by Australian industry for control of sewer odours, with recommendations for further research. • An activated carbon (AC) odour adsorption test rig has been developed and is being used to determine adsorptive capacity and the service life of various AC types. • A new ventilation model has been developed based on the conservation of momentum and conducted field testing in Adelaide and Perth to verify the model. • Guidelines have been prepared for the design and evaluation of forced and natural ventilation systems in sewers using the newly developed ventilation model. Theme 3 -- Liquid Phase Technologies • A sewer laboratory-based reactor, SCORe-CT, using real wastewater and typical diurnal patterns, has been verified and calibrated to simulate a real rising main (based on Gold Coast UC09 pump station), to test the effectiveness and response to chemical dosing for control of sulphide. • A literature review has been conducted of new and emerging biochemical products that are available for odour control in sewers and a report prepared with recommendations of products to be tested under laboratory conditions. Testing of three of these products has been completed. • An industry survey has been conducted on the chemical dosing systems used sewer processes Figure 5: Laboratory corrosion chambers (a) and field corrosion coupon installations (b), (c) and (d).
Water Journal April 2011