The application of the GPS-X computer simulation of sewage works to a 55 Ml/d dry weather flow (dwf) nitrifying activated sludge plant (ASP) is described. The role of simulation and the features of a simulation package as required by the end user are outlined. The plant processes, operation, performance and the instrumentation are described. The on- line measurements are collected and displayed by the GFX monitoring system which acts as input/output stage for GPS-X. The simulation package uses the IAWPRC model with modifications based on Dold (1990). The features of the model, its calibration and successful verification are described.
This paper will describe, with minimal reference to mathematically derived formulae, the importance and use of respirometry as a design and process operating tool. The authors will report on the latest findings of their team working in the United Kingdom. They will present case studies of events that were rapidly identified by the use of on-line respirometry.
Sequencing Batch Reactors (SBR) are a popular choice for wastewater treatment. Proponents of the technology note that SBRs do not require secondary clarifiers, can be adapted to biological nutrient removal and have a smaller overall footprint than conventional activated sludge treatment.The authors of this paper would like to suggest a further advantage to SBR technology -that it is the most controllable treatment option. They argue that respirometry is the best technique for controlling an SBR. Based on several years' experience in developing online respirometers, the algorithms for SBR control are now available for implementation in the form of a new Smart Activated Sludge (SAS) controller. This paper presents the fundamental principles behind respirometric control of an SBR and insight into how this can be applied to a full-scale SBR.
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