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- W2553620384 abstract "Effluent irrigation has been an increasingly important option for reusing and disposing of effluent produced by intensive rural industries, sewage treatment plants and domestic on-site systems over the past few decades. Over this time, regulatory controls on the environment have become more stringent, as effluent irrigation schemes in Queensland continue to be located in tropical and sub-tropical areas, often with conditions adverse to their successful establishment such as high rainfall and poor soils. MEDLI (Model for Effluent Disposal using Land Irrigation) has been used by designers and regulators over the past 15 years to assess the environmental impact of effluent irrigation schemes. In this paper, the usefulness of the MEDLI model over the past decade in effluent irrigation assessments is reviewed, including what has performed well and what could be improved. Since its development by the Cooperative Research Centre for Waste Management and Pollution Control Ltd, Commonwealth Scientific and Industrial Research Organisation (CSIRO), and the Queensland Department of Primary Industries (now the Department of Environment and Resource Management), MEDLI has enjoyed reasonable success in its uptake and use by consultants, regulators, industry, and universities around Australia and overseas. The majority of Queensland effluent irrigation designs now use MEDLI, not the least reason being that it was recommended as the design tool in the Queensland effluent reuse guidelines for both sewage treatment plants and animal industry enterprises. It remains in use despite suffering the incompatibility problems associated with all legacy software developed pre-Windows 2000. Its success has been attributed to a number of factors including: the absence of a similar model that performs the same task; the difficulty and cost of developing modelling software for such a small niche market; clear benefits to a target user audience, the scientific integrity of the model (in terms of algorithms and peer review process), low purchase cost; and ongoing support provided by model developers themselves. These factors and other lessons from our interaction with MEDLI users will be discussed in the paper. The critical issue for effluent irrigation scheme designers is not just one of predicting water, nutrient and salt outcomes of a particular design, but also is one of interpreting results in terms of performance criteria. How do we interpret the results such as frequency of pond overtopping, percentage of the effluent that is reused, and nitrate concentration in the soil solution leachate in terms of sustainability? What number is acceptable and what number is unacceptable? It is our view that environmental protection policy and guidelines are needed to help address these questions and we introduce possible performance criteria to help determine if a model result is acceptable or unacceptable. We discuss the application of MEDLI to assess irrigation proposals, with a particular focus on its use to assist enlightened environmental regulation in Queensland. A risk-based policy framework is proposed to guide the assessment of effluent irrigation schemes in the future. This is designed to help address the key issue of identifying non-sustainable practice, along with planned improvements in the modeling software/application framework to support this approach." @default.
- W2553620384 created "2016-11-30" @default.
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- W2553620384 date "2011-12-12" @default.
- W2553620384 modified "2023-09-29" @default.
- W2553620384 title "Sustainable effluent irrigation over the past decade – The role of MEDLI modelling for wastewater discharge" @default.
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- W2553620384 doi "https://doi.org/10.36334/modsim.2011.g7.vieritz" @default.
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