watertap.flowsheets.activated_sludge package

Submodules

watertap.flowsheets.activated_sludge.ASM1_flowsheet module

Example of activated sludge process model based on BSM1 study using ASM1 reactions. This process contains 2 anoxic tanks followed by 3 aerobic tanks and a clarifier with recycle streams.

Unit operations are modeled as follows:

Anoxic reactors as standard CSTRs (CSTR)

Aerobic reactors as CSTRs with additional injection terms (CSTR_Injection)

Clarifier as a Separator with split fractions by components

Note that a pressure changer is required in the recycle stream to ensure the pressure inside the recycle loop is bounded. As the inlet Mixer uses a pressure minimization constraint and there is no pressure drop in the reactors, if pressure is not specified at some point within the recycle loop then it becomes unbounded.

Based on example from:

[1] J. Alex, L. Benedetti, J. Copp, K.V. Gernaey, U. Jeppsson, I. Nopens, M.N. Pons, J.P. Steyer and P. Vanrolleghem, “Benchmark Simulation Model no. 1 (BSM1)”, 2018

watertap.flowsheets.activated_sludge.ASM2D_flowsheet module

Based on flowsheet from:

Flores-Alsina X., Gernaey K.V. and Jeppsson, U. “Benchmarking biological nutrient removal in wastewater treatment plants: influence of mathematical model assumptions”, 2012, Wat. Sci. Tech., Vol. 65 No. 8, pp. 1496-1505

Additional References: [1] J. Alex, L. Benedetti, J. Copp, K.V. Gernaey, U. Jeppsson, I. Nopens, M.N. Pons, C.Rosen, J.P. Steyer and P. Vanrolleghem, “Benchmark Simulation Model no. 2 (BSM2)”, 2018

[2] J. Alex, L. Benedetti, J. Copp, K.V. Gernaey, U. Jeppsson, I. Nopens, M.N. Pons, J.P. Steyer and P. Vanrolleghem, “Benchmark Simulation Model no. 1 (BSM1)”, 2018

watertap.flowsheets.activated_sludge.ASM2D_flowsheet_noPHA module

watertap.flowsheets.activated_sludge.UConn_WRRF module

Example of activated sludge process model, based on 5 CSTR representation of the University of Connecticut’s

Water Resource Recovery Facility, conceptualized by Stuber’s Process Systems and Operations Research Laboratory.

Layout:

5 reactors
- R1, R3, R5: anoxic
- R2 and R4: aerobic
2 Mixers:
- M1 mixes feed and R5 split fraction, outlet to R1 inlet
- M2 mixes R1 outlet, R2 outlet, outlet to R3 inlet
1 Splitter:
- separates R5 outlet into effluent, M1 inlet, and R2 inlet