Water Journal : Water Journal August 2012
conference reviews A detailed but sophisticated methodology was used to show that target microorganisms decayed faster in biosolids-amended soil compared with unamended soil; decay times were specific to microorganism type; and microorganism decay was correlated to declining soil moisture levels and increasing soil temperature. The researchers concluded that the risk of transmission of disease-causing microorganisms (pathogens) from cereal crops fertilised with biosolids was likely to be low, an important finding which the mass media should take note of in the light of its continuing criticisms of the risks of biosolids applied to farm lands used for growing many food crops. Another paper of note came from our New Zealand colleagues, always most welcome delegates to AWA Conferences. Jacqui Horswell, on behalf of a large team of her colleagues, presented a paper titled 'Biosolids Reuse in New Zealand -- Assessing the Impacts of Chemical Cocktails on the Soil Ecosystem'. Using soils contaminated with copper, zinc and triclosan, lysimeters were constructed from 15cm lengths of 13cm-diameter PVC pipe. The base of the lysimeters contained a layer of gravel to retain the soil and assist drainage. Field-moist soil (1kg) was adjusted to 65% water-holding capacity and spiked with triclosan. Triclosan degraded rapidly in the soils, with methyl- triclosan being the major degradation product. However, as metal concentration increased, transformation and degradation of triclosan decreased. These preliminary results suggest that co-contaminants can result in a combined effect level that is potentially greater than the sum of the individual effects, with additional impacts on degradation rates. All in all, the standard of papers submitted to the conference was excellent. The Conference Committee was pleased to award the Best Paper and Presentation -- Source Management to Colin Hester of Queensland Urban Utilities, for his paper 'Development of a Catchment-Based Trade Waste Mass Load Model', co-authored with Brett Eaton of Better Technical Options (NZ) (see page xx for the paper). Peter Bishop, of Melbourne Water Corporation, won the award for Best Paper and Presentation -- Biosolids, for his paper Development of a Beneficial Use for Clay-Rich Biosolids (see page xx). Delegates also spent an enjoyable evening at SeaWorld for the conference dinner, where Deb Pritchard and Damien Batstone got their feet wet playing with the dolphins! Delegates at the Biosolids workshop. Deborah Pritchard makes the acquaintance of a friendly dolphin. TOMAL operates in Australia as a division of ProMinent Fluid Controls Pty Ltd Unit 4, 4 Narabang Way, BELROSE, NSW 2085, AUSTRALIA • phone +61 2 9450 0995 • fax +61 2 9450 0996 • email: firstname.lastname@example.org • www.tomal.com.au TOMAL® METERING SYSTEMS ProMinent® ProMinent makes polymer handling easy with Tomal. Small Bags, vacuum transfer empties a 20 kg bag in 90 seconds. Bulk Bags, dust free connection, fork lift or electric hoist & trolley loading; integrated into the polymer system or remote with auto-fll via vacuum transfer. Bulk Storage Hopper, fll via bulk bag or pneumatic transfer; integrated into the polymer system or remote with auto-fll via vacuum transfer. Peace of mind with complete ProMinent support including polymer dosing pump skids, design, fabrication, installation and after sales service.
Water Journal September 2012-1
Water Journal July 2012