This package implements property relationships for the treatment of wastewater using an activated sludge biological reactor as provided in Henze, M. et al. (1987).
- This Activated Sludge Model no.1 (ASM1) property/reaction package:
- supports 'H2O', 'S_I', 'S_S', 'X_I', 'X_S', 'X_BH', 'X_BA', 'X_P', 'S_O', 'S_NO', 'S_NH', 'S_ND', 'X_ND', and 'S_ALK' as components
- supports only liquid phase
Description | Symbol | Indices |
---|---|---|
Components | j | ['H2O', 'S_I', 'S_S', 'X_I', 'X_S', 'X_BH', 'X_BA', 'X_P', 'S_O', 'S_NO', 'S_NH', 'S_ND', 'X_ND', 'S_ALK'] |
Phases | p | ['Liq'] |
Description | Symbol | Variable |
---|---|---|
Soluble inert organic matter, S_I | SI | S_I |
Readily biodegradable substrate S_S | SS | S_S |
Particulate inert organic matter, X_I | XI | X_I |
Slowly biodegradable substrate X_S | XS | X_S |
Active heterotrophic biomass X_B,H | XB, H | X_BH |
Active autotrophic biomass X_B,A | XB, A | X_BA |
Particulate products arising from biomass decay, X_P | XP | X_P |
Oxygen, S_O | SO | S_O |
Nitrate and nitrite nitrogen, S_NO | SNO | S_NO |
NH4 + + NH 3 Nitrogen, S_NH | SNH | S_NH |
Soluble biodegradable organic nitrogen, S_ND | SND | S_ND |
Particulate biodegradable organic nitrogen, X_ND | XND | X_ND |
Alkalinity, S_ALK | SALK | S_ALK |
Description | Symbol | Variable | Index | Units |
---|---|---|---|---|
Total volumetric flowrate | Q | flow_vol | None | m3/s |
Temperature | T | temperature | None | K |
Pressure | P | pressure | None | Pa |
Component mass concentrations | Cj | conc_mass_comp | [j] | kg/m3 |
Alkalinity in molar concentration | A | alkalinity | None | kmol HCO3−/m3 |
Description | Symbol | Parameter | Value at 20 C | Units |
---|---|---|---|---|
Yield of cell COD formed per g N consumed, Y_A | YA | Y_A | 0.24 | dimensionless |
Yield of cell COD formed per g COD oxidized, Y_H | YH | Y_H | 0.67 | dimensionless |
Fraction of biomass yielding particulate products, f_p | fP | f_p | 0.08 | dimensionless |
Mass fraction of N per COD in biomass, i_xb | iXB | i_xb | 0.08 | dimensionless |
Mass fraction of N per COD in particulates, i_xp | iXP | i_xp | 0.06 | dimensionless |
Description | Symbol | Parameter | Value at 20 C | Units |
---|---|---|---|---|
Maximum specific growth rate for autotrophic biomass, mu_A | µA | mu_A | 0.5 | d − 1 |
Maximum specific growth rate for heterotrophic biomass, mu_H | µH | mu_H | 4.0 | d − 1 |
Half-saturation coefficient for heterotrophic biomass, K_S | KS | K_S | 0.01 | kg COD/m3 |
Oxygen half-saturation coefficient for heterotrophic biomass, K_O,H | KO, H | K_OH | 0.0002 | kg -COD/m3 |
Oxygen half-saturation coefficient for autotrophic biomass, K_O,A | KO, A | K_OA | 0.0004 | kg -COD/m3 |
Nitrate half-saturation coefficient for denitrifying heterotrophic biomass, K_NO | KNO | K_NO | 0.0005 | kg NO3-N/m3 |
Decay coefficient for heterotrophic biomass, b_H | bH | b_H | 0.3 | d − 1 |
Decay coefficient for autotrophic biomass, b_A | bA | b_A | 0.05 | d − 1 |
Correction factor for mu_H under anoxic conditions, eta_g | ηg | eta_g | 0.8 | dimensionless |
Correction factor for hydrolysis under anoxic conditions, eta_h | ηh | eta_h | 0.8 | dimensionless |
Maximum specific hydrolysis rate, k_h | kh | k_h | 3.0 | d − 1 |
Half-saturation coefficient for hydrolysis of slowly biodegradable substrate, K_X | KX | K_X | 0.1 | dimensionless |
Ammonia Half-saturation coefficient for autotrophic biomass, K_NH | KNH | K_NH | 1.0 | kg NH3-N/m3 |
Ammonification rate, k_a | ka | k_a | 0.00005 | m3/kg COD . d |
Description | Symbol | Variable | Index | Units |
---|---|---|---|---|
Fluid specific heat capacity | cp | cp | None | J/kg/K |
Mass density | ρ | dens_mass | [p] | kg/m3 |
Description | Equation |
---|---|
Aerobic growth of heterotrophs | |
Anoxic growth of heterotrophs | |
Aerobic growth of autotrophs | |
Decay of heterotrophs | ρ4 = bHXB, H |
Decay of autotrophs | ρ5 = bHXB, H |
Ammonification of soluble organic nitrogen | ρ6 = kaSNDXB, H |
Hydrolysis of entrapped organics | |
Hydrolysis of entrapped organic nitrogen |
Scaling for the ASM1 property package has yet to be implemented.
watertap.property_models.activated_sludge.asm1_properties
ASM1ParameterBlock
ASM1ParameterData
_ASM1StateBlock
ASM1StateBlockData
watertap.property_models.activated_sludge.asm1_reactions
ASM1ReactionParameterBlock
ASM1ReactionParameterData
_ASM1ReactionBlock
ASM1ReactionBlockData
[1] Henze, M., Grady, C.P.L., Gujer, W., Marais, G.v.R., Matsuo, T., "Activated Sludge Model No. 1", 1987, IAWPRC Task Group on Mathematical Modeling for Design and Operation of Biological Wastewater Treatment. https://belinra.inrae.fr/doc_num.php?explnum_id=4467
[2] Alex, J. et al. Benchmark Simulation Model no.1 (BSM1). Lund University, 2008, 5-6. https://www.iea.lth.se/publications/Reports/LTH-IEA-7229.pdf