Configuration

PyADM1ODE_calibration offers flexible configuration options for parameters, optimizers, and objective functions.

Calibratable Parameters

The following ADM1 parameters are most commonly used for calibration:

Parameter	Description	Unit	Typical Range
k_dis	Disintegration constant	1/d	0.3 - 0.8
k_hyd_ch	Carbohydrate hydrolysis rate	1/d	5.0 - 15.0
k_m_ac	Max. uptake rate acetate	1/d	4.0 - 12.0
Y_su	Yield coefficient sugar degraders	kg COD/kg COD	0.05 - 0.15

Parameter Bounds

You can manually define the search ranges for the optimization:

bounds = {
    "k_dis": (0.2, 1.0),
    "k_hyd_ch": (2.0, 20.0)
}

Optimization Methods

Supported algorithms for the calibrate method:

• differential_evolution (default): Robust for global search.
• nelder-mead: Efficient for local search (good for online calibration).
• l-bfgs-b: Gradient-based, requires smooth objective functions.
• particle_swarm: Stochastic global search.

Objective Functions

By default, methane production (Q_ch4) is optimized. However, you can weight multiple variables:

objectives = ["Q_ch4", "pH", "VFA"]
weights = {
    "Q_ch4": 0.7,
    "pH": 0.2,
    "VFA": 0.1
}

Database Connection

The database is configured via a connection URL (SQLAlchemy format):

db_url = "postgresql://user:password@localhost:5432/biogas_db"