http://espace.library.uq.edu.au/ The University of Queensland en Fez http://blogs.law.harvard.edu/tech/rss http://espace.library.uq.edu.au/view/UQ:23827 An approximate analytical technique employing a finite integral transform is developed to solve the reaction diffusion problem with Michaelis-Menten kinetics in a solid of general shape. A simple infinite series solution for the substrate concentration is obtained as a function of the Thiele modulus, modified Sherwood number, and Michaelis constant. An iteration scheme is developed to bring the approximate solution closer to the exact solution. Comparison with the known exact solutions for slab geometry (quadrature) and numerically exact solutions for spherical geometry (orthogonal collocation) shows excellent agreement for all values of the Thiele modulus and Michaelis constant. 2007-06-25T00:00:00Z Do, D. og Greenfield, P. http://espace.library.uq.edu.au/view/UQ:162540 2009-02-02T00:00:00Z Greenfield, P. F. og Batstone, D. J. http://espace.library.uq.edu.au/view/UQ:118370 The debate as to whether carbon dioxide, methane, nitrous oxide and other greenhouse gas emissions will become subject to increasing regulation, increased restrictions, and probably to some form of carbon tax, has moved from a simple "yes" or "no" to "when". Wastewater treatment plants will be significantly impacted by increased energy costs and by specific regulations and/or penalties associated with emissions of methane and nitrous oxide. In this paper, the greenhouse gases emissions of different wastewater process options are estimated. The paper outlines the increasing need for wastewater treatment plants to factor greenhouse gas mitigation issues into their medium- as and long-term strategies, and identifies anaerobic enhouse as processes as being at the core of such strategies. Further, the paper identifies a number of key research challenges to be addressed if such strategies are to play a larger role in attenuating the likely impacts of GHG mitigation requirements on wastewater treatment plant design and operation. 2007-10-17T00:00:00Z Greenfield, P.F. og Batstone, D.J. http://espace.library.uq.edu.au/view/UQ:141708 2008-06-10T00:00:00Z Ong, H. K. og Greenfield, P. F. og Pullammanappallil, P. http://espace.library.uq.edu.au/view/UQ:143560 The current management and economic status of Australian urban landfilling is summarized. Landfills in four Australian metropolitan areas (Brisbane, Melbourne, Adelaide and Perth) were surveyed, focusing on management and economic issues. The management issues include aspects of site management and environmental monitoring. The economic components comprise the landfill charges, the capital and operating costs and the costs of site rehabilitation. It was found that: (1) in terms of the current landfill guidelines the average revel of compliance with respect to environmental management in these urban landfills is relatively low; (2) landfill tipping fees do not reflect the true costs of waste disposal; and (3) there are substantial cross-subsidies in regional landfill management systems. 2008-06-10T00:00:00Z Xu, X. L. og Rudolph, V. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:151129 2008-06-06T00:00:00Z Greenfield, P. F. og Reid, S. og Weiss, S. og Christian, P. og Scholz, B. http://espace.library.uq.edu.au/view/UQ:141709 2008-06-10T00:00:00Z Ong, H. K. og Pullammanappallil, P. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:67596 2007-08-14T00:00:00Z Xu, X. og Rudolph, V. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:59962 Titania sol-pillared clay (TiO2 PILC) and silica-titania sol-pillared clay (SiO2-TiO2 PILC) were synthesized by the sol-gel method. Supercritical drying (SCD) and treatment with quaternary ammonium surfactants were used to tailor the pore structure of the resulting clay. It was found that SCD approach increased the external surface area of the PILCs dramatically and that treatment with surfactants could be used to tailor pore size because the mesopore formation in the galleries between the clay layers follows the templating mechanism as observed in the synthesis of MCM-41 materials. Highly mesoporous solids were thus obtained. In calcined TiO2 PILC, ultrafine crystallites in anatase phase, which are active for photocatalytic oxidation of organics, were observed. In SiO2-TiO2 PILCs and their derivatives, titanium was highly dispersed in the matrix of silica and no crystal phase was observed. The highly dispersed titanium sites are good catalytic centers for selective oxidation of organic compounds. (C) 2001 Academic Press. 2007-08-14T00:00:00Z Ding, Z. og Zhu, H. Y. og Greenfield, P. F. og Lu, G. Q. http://espace.library.uq.edu.au/view/UQ:74095 Vermicompost filtration is a new on-site waste treatment system. Consequently, little is known about the filter medium properties. The aim of this preliminary study was to quantify physical and compositional properties of vermicompost filter beds that had been used to treat domestic solid organic waste and wastewater. This paper presents the trials performed on pilot-scale reactors filled with vermicompost from a full-scale vermicompost filtration system. Household solid organic waste and raw wastewater at the rate of 130 L/m(2)/d was applied to the reactor bed surface over a four-month period. It was found that fresh casts laid on the bed surface had a BOD of 1290 mg/g VS while casts buried to a depth of 10 cm had a BOD of 605 mg/g VS. Below this depth there was little further biodegradation of earthworm casts despite cast ages of up to five years. Solid material in the reactor accounted for only 7-10% of the reactor volume. The total voidage comprised of large free-draining pores, which accounted for 15-20% of the reactor volume and 60-70% micropores, able to hold up water against gravity. It was shown that water could flow through the medium micropores and macropores following a wastewater application. The wastewater flow characteristics were modeled by a two-region model based on the Richards Equation, an equation used to describe porous spatially heterogeneous materials. 2007-08-15T00:00:00Z Taylor, M. og Clarke, W. P. og Greenfield, P. F. og Swain, G. J. http://espace.library.uq.edu.au/view/UQ:175815 2009-04-15T00:00:00Z Hoegh-Guldberg, O. og Mumby, P. J. og Hooten, A. J. og Steneck, R. S. og Greenfield, P. og Gomez, E. og Harvell, D. R. og Sale, P. F. og Edwards, A. J. og Caldeira, K. og Knowlton, N. og Eakin, C. M. og Iglesias-Prieto, R. og Muthiga, N. og Bradbury, R. H. og Dubi, A. og Hatziolos, M. E. http://espace.library.uq.edu.au/view/UQ:130839 2008-02-18T00:00:00Z Hoegh-Guldberg, O. og Mumby, P. J. og Hooten, A. J. og Steneck, R. S. og Greenfield, P. og Gomez, E. og Harvell, C. D. og Sale, P. F. og Edwards, A. J. og Caldeira, K. og Knowlton, N. og Eakin, C. M. og Iglesias-Prieto, R. og Muthiga, N. og Bradbury, R. H. og Dubi, A. og Hatziolos, M. E. http://espace.library.uq.edu.au/view/UQ:151120 2008-06-06T00:00:00Z Waiprib, Y. og Greenfield, P. F. og Reid, S. http://espace.library.uq.edu.au/view/UQ:79463 The Moreton Bay Waterways and Catchments Partnership, now branded the Healthy Waterways Partnership, has built on the experience of the past 15 years here in South East Queensland (SEQ). It focuses on water quality and the ecosystem health of our freshwater, estuarine and marine systems through the implementation of actions by individual partners and the collective oversight of a regional work program that assists partners to prioritise their investments and address emerging issues. This regional program includes monitoring, reporting, marketing and communication, development of decision support tools, research that is directed to problem solving, and maintaining extensive consultative and engagement arrangements. The Partnership has produced information-based outcomes which have led to significant cost savings in the protection of water quality and ecosystem resources by its stakeholders. This has been achieved by: – providing a clear focus for management actions that has ownership of governments, industry and community; – targeted scientific research to address issues requiring appropriate management actions; – management actions based on a sound understanding of the waterways and rigorous public consultation; and, – development and implementation of a strategy that incorporates commitments from all levels of stakeholders. While focusing on our waterways, the Partnership’s approach includes addressing catchment management issues particularly relating to the management of diffuse pollution sources in both urban and rural landscapes as well as point source loads. We are now working with other stakeholders to develop a framework for integrated water management that will link water quality and water quantity goals and priorities. 2007-08-15T00:00:00Z Abal, Eva G. og Greenfield, Paul F. og Bunn, Stuart E. og Tarte, Diane M. http://espace.library.uq.edu.au/view/UQ:141711 This investigation demonstrates that in situ respirometry can be an effective tool to manage the removal of an inhibitory substrate in a sequencing batch reactor (SBR). Data collected enabled the determination of an optimum operating cycle for the effective treatment of a synthetic wastewater containing up to 1300 mg/l phenol as the sole carbon source. Oxygen uptake rates were monitored in situ at various stages of a bench-scale sequencing batch reactor. Respirometry was used as an indicator of microbial activity and substrate utilisation. Although the profile of the Oxygen Uptake Rate (OUR) followed closely that of phenol substrate removal, any correlation between the OUR and soluble residual substrate COD was specific to that system. A high OUR Value corresponded to the feed period; at the end of the cycle, when the substrate was depleted, the OUR Value was low. A plot of OUR values provided a good indication of the biological activity in the reactior. It was possible to select an optimum operating cycle using the oxygen uptake rates as an indicator for the removal of phenol. The initial operating cycle was 24 h, which included phases for filling, reaction, quiescence and decanting. From oxygen uptake rates and corresponding soluble COD values of the remaining substrate, data showed that the 4 h operating cycle was able to achieve similar substrate removal efficiencies. At a SBR loading rate of 3.12 kg phenol m(-3)d(-1), removal of 97% COD was achieved at the end of the cycle. The reactor was operated at a SRT of 4-27 days with biomass concentrations ranging from 3500-3900 mg/l. (C) 1999 Elsevier Science Ltd. All rights reserved. 2008-06-10T00:00:00Z E. T. Yoong og P. A. Lant og P. F. Greenfield http://espace.library.uq.edu.au/view/UQ:60361 The Brisbane River and Moreton Bay Study, an interdisciplinary study of Moreton Bay and its major tributaries, was initiated to address water quality issues which link sewage and diffuse loading with environmental degradation. Runoff and deposition of fine-grained sediments into Moreton Bay, followed by resuspension, have been linked with increased turbidity and significant loss of seagrass habitat. Sewage-derived nutrient enrichment, particularly nitrogen (N), has been linked to algal blooms by sewage plume maps. Blooms of a marine cyanobacterium, Lyngbya majuscula, in Moreton Bay have resulted in significant impacts on human health (e.g., contact dermatitis) and ecological health (e.g., seagrass loss), and the availability of dissolved iron from acid sulfate soil runoff has been hypothesised. The impacts of catchment activities resulting in runoff of sediments, nutrients and dissolved iron on the health of the Moreton Bay waterways are addressed. The Study, established by 6 local councils in association with two state departments in 1994, forms a regional component of a national and state program to achieve ecologically sustainable use of the waterways by protecting and enhancing their health, while maintaining economic and social development. The Study framework illustrates a unique integrated approach to water quality management whereby scientific research, community participation and the strategy development were done in parallel with each other. This collaborative effort resulted in a water quality management strategy which focuses on the integration of socioeconomic and ecological values of the waterways. This work has led to significant cost savings in infrastructure by providing a clear focus on initiatives towards achieving healthy waterways. The Study's Stage 2 initiatives form the basis for this paper. 2007-08-14T00:00:00Z Abal, E. G. og Dennison, W. C. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:141457 2008-06-10T00:00:00Z Ding, Zhe og Hu, Xijun og Lu, Gao Q. og Yue, Po-Lock og Greenfield, Paul F. http://espace.library.uq.edu.au/view/UQ:148298 2008-06-06T00:00:00Z Ding, Z. og Zhu, H. Y. og Lu, M.G. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:144181 Immunosorbent electron microscopy was used to quantify recombinant baculovirus-generated bluetongue virus (BTV) core-like particles (CLP) in either purified preparations or lysates of recombinant baculovirus-infected cells. The capture antibody was an anti-BTV VP7 monoclonal antibody. The CLP concentration in purified preparations was determined to be 6.6 x 10(15) particles/l. CLP concentration in lysates of recombinant baculovirus-infected cells was determined at various times post-infection and shown to reach a value of 3 x 10(15) particles/l of culture medium at 96 h post-infection. The results indicated that immunosorbent electron microscopy, aided by an improved particle counting method, is a simple, rapid and accurate technique for the quantification of virus and virus-like particles produced in large scale in vitro systems. (C) 1999 Elsevier Science B.V. All rights reserved. 2008-06-10T00:00:00Z Zheng, YZ og Hyatt, A og Wang, LF og Eaton, BT og Greenfield, PF og Reid, S http://espace.library.uq.edu.au/view/UQ:107793 2007-08-27T00:00:00Z http://espace.library.uq.edu.au/view/UQ:164291 Riversymposium 2002, the 5th international river management symposium, again provided a forum for world authorities on river management issues to come together to address scientific research, engineering practice and policy development. There is a strong contribution from Australasia, but with renowned authors from America, Europe and Asia, there is much that will prove highly valuable to readers anywhere around the world. 2009-02-13T00:00:00Z P. Greenfield og S. Ward http://espace.library.uq.edu.au/view/UQ:151153 2008-06-06T00:00:00Z Ding, Z. og Lu, G. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:106962 2007-08-24T00:00:00Z Daniel, Lisa J. http://espace.library.uq.edu.au/view/UQ:272878 2012-04-19T00:00:00Z Taylor, Michael http://espace.library.uq.edu.au/view/UQ:162276 2009-01-30T00:00:00Z Greenfield, P. F. og Keller, J. og Lu, G. W. M. http://espace.library.uq.edu.au/view/UQ:66892 The aim of this study is to quantity the effect of filter bed depth and solid waste inputs on the performance of small-scale vermicompost filter beds that treat the soluble contaminants within domestic wastewater. The study also aims to identify environmental conditions within the filters by quantifying the oxygen content and pH of wastewater held within it. Vermicompost is being utilised within commercially available on-site domestic waste treatment systems however, there are few reported studies that have examined this medium for the purpose of wastewater treatment. Three replicate small-scale reactors were designed to enable wastewater sampling at five reactor depths in 10-cm intervals. The surface of each reactor received household solid organic waste and 1301 m(-2) per day of raw domestic wastewater. The solid waste at the filter bed surface leached oxygen demand into the wastewater flowing through it. The oxygen demand was subsequently removed in lower reactor sections. Both nitrification and denitrification occurred in the bed. The extent of denitrification was a function of BOD leached from the solid waste. The environmental conditions measured within the bed were found to be suitable for earthworms living within them. The study identified factors that will affect the performance and application of the vermicompost filtration technology. (C) 2004 Elsevier B.V. All rights reserved. 2007-08-15T00:00:00Z Taylor, M. og Clarke, W. P. og Greenfield, P. F. http://espace.library.uq.edu.au/view/UQ:145363 2008-06-10T00:00:00Z Liyanage, S. og Greenfield, P. F. og Don, R.