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Development of a Dynamic Whole-Plant Model Using the IWA Good Modeling Practice Unified Protocol to Investigate Plant Upgrade Options

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A BioWin process model was developed for the Subiaco wastewater treatment plant (WWTP), Perth, Australia, using the International Water Association (IWA) unified protocol. This model was used to evaluate the capacity of the existing facility and was then used to develop five dynamic whole-plant models containing potential future secondary treatment alternatives to accommodate future flow increases of 75 MLD and 85 MLD. Three alternatives – Modified Ludzack-Ettinger (MLE), membrane bio-reactor (MBR), and integrated fixed-film activated sludge (IFAS) - would increase plant capacity by adding new infrastructure. Two alternatives investigated deferral of major capital expenditure by optimizing the use of existing infrastructure to try to meet effluent permit limits. This was done using parallel treatment processes whereby only a portion of the flow underwent full nitrogen removal and the remaining flow was blended with it after secondary treatment. The alternatives that were investigated were: chemically assisted sedimentation (CAS) for primary treatment, followed by MLE on only a portion of the total flow, and conventional primary treatment followed by carbonaceous only treatment in parallel with MLE. The alternatives analysis showed that the alternatives requiring new infrastructure would be capable of achieving a higher effluent quality but would require significantly more blower capacity than the alternatives that used existing infrastructure. Of the five alternatives that were modeled, three were recommended for further investigation, namely: Conventional MLE, IFAS and CAS in parallel with MLE
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Keywords: Chemically Assisted Sedimentation (CAS); Dynamic Modeling; Integrated fixed film activated sludge (IFAS); Membrane Bioreactor (MBR); Modified Ludzack-Ettinger; Parallel treatment; Whole-plant model

Document Type: Research Article

Publication date: 2009-01-01

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