Wastewater Investigation Modeling

• Process Sizing
• Steady-State Process Performance Prediction
• Rapid Mass Balance Calculations
• Sensitivity Analysis
• Hydraulic Analysis
• Cost Comparisons
• Calculation of Power and Chemical Requirement
• Site Layout
• Plant Diagnostic

Dvirka and Bartilucci Consulting Engineers (D&B) has available two software tools for simulating wastewater treatment processes: STOAT (Sewage Treatment Operation and Analysis over Time) and Plan-It STOAT. The software has been used by D&B and its affifiated company WRc/D&B, llc for the design and optimization of many treatment plants worldwide, including three major wastewater facilities in the northeast United States: the Philadelphia Water Department (PWD), Camden County Municipal Utilities Authority (CCMUA), and Passaic Valley Sewerage Commissioners (PVSC).

STOAT is a dynamic model which predicts the response of wastewater treatment processes to the time varying nature of influent wastewater. The software can be used to simulate individual treatment processes or the whole treatment plant, including sludge treatment processes, septic tank loadings, and recycle flows. STOAT enables users to investigate alternative design strategies for new and modified plants and to optimize the response of existing plants to changes in influent loads, capacity issues or process operating conditions. It gives an accurate prediction of effluent quality to ensure permit compliance.

STOAT contains a range of features including modeling of both BOD and COD, integration with leading sewerage and river quality models, user-friendly interface, and simplified sewer modeling.

STOAT has been used as part of D&B’s wastewater treatment plant investigation service, to optimize the performance of treatment plants; for example, to meet tighter effluent standards. STOAT has been used to investigate options for nutrient (nitrogen and phosphorus) removal, and also has been used successfully to defer costly capital expenditure by achieving the best possible performance from the existing plant.

The software contains models for all common treatment processes, including primary treatment, activated sludge, biological filtration, and sludge treatment.

STOAT is used by a wide array of municipalities worldwide, including the Philadelphia Water Department (PWD), Camden County Municipal Utilities Authority (CCMUA) and Thames Water.

Plan-It STOAT has been developed as a tool to assist in the planning and predesign of wastewater treatment plants. It is designed to provide rapid assessment of alternative design strategies. The software is unique in its range of functionality including process considerations, hydraulics, costing, and site layouts.

Plan-It STOAT has been used on a wide array of plants to investigate new design alternatives and existing plant upgrades and to provide a rapid assessment of plant capacity availability.

For more information on D&B’s Wastewater Management Services, please contact Executive Vice President, Steven A. Fangmann, P.E., at (516) 364-9890 x 3005, or Senior Vice President, Joseph H. Marturano, at (516) 364-9890 x 3008.