Successful modeling of wastewater treatment plant (WWTP) processes requires an accurate description of the plant hydraulics. Common methods such as tracer experiments are difficult and costly and thus have limited applicability in practice; engineers are often forced to rely on their experience only. An implementation of grammar-based genetic programming with an encoding to represent hydraulic reactor models as program trees should fill this gap: The encoding enables the algorithm to construct arbitrary reactor models compatible with common software used for WWTP modeling by linking building blocks, such as continuous stirred-tank reactors. Discharge measurements and influent and effluent concentrations are the only required inputs. As shown in a synthetic example, the technique can be used to identify a set of reactor models that perform equally well. Instead of being guided by experience, the most suitable model can now be chosen by the engineer from the set. In a second example, temperature measurements at the influent and effluent of a primary clarifier are used to generate a reactor model. A virtual tracer experiment performed on the reactor model has good agreement with a tracer experiment performed on-site.
Keywords: grammar-based genetic programming, hydraulic reactor systems, modeling, operating data
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Number of Tanks: 4Total Volume: 13,080 m³Water Depth: 4.75 mSOTR Standard Oxygen Transfer Rate: 1,240 kgO2/hTotal Airflow: 10,800 Nm3/hTotal AEROSTRIP® Diffusers: 1,214The Central Kitsap facility started operations in 1979 as a conventional activated sludge secondary treatment plant.The plant receives wastewater from the cities of Silverdale, Keyport and Poulsbo, the Central Kitsap area, the Naval Submarine Base Bangor and the Naval Undersea Warfare Engineering Station (NUWC) at Keyport.AEROSTRIP - SSOTE...
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