Biological Components¶

Components for biological conversion processes in biogas plants.

Digester¶

The main fermenter that implements the ADM1 model for anaerobic digestion.

Parameters¶

from pyadm1.configurator.plant_configurator import PlantConfigurator

configurator.add_digester(
    digester_id="main_digester",      # Unique identifier
    V_liq=2000.0,                     # Liquid volume [m³]
    V_gas=300.0,                      # Gas volume [m³]
    T_ad=308.15,                      # Operating temperature [K]
    name="Main Digester",             # Readable name
    load_initial_state=True,          # Load steady-state initialization
    Q_substrates=[15, 10, 0, ...]    # Substrate feed rates [m³/d]
)

Sizing Guidelines¶

Plant Size	V_liq [m³]	V_gas [m³]	Feed Rate [m³/d]	HRT [Days]
Small	300-800	50-120	10-25	20-40
Medium	1000-3000	150-450	25-75	25-45
Large	3000-8000	450-1200	75-200	30-50

Temperature Options¶

Psychrophilic: 298.15 K (25°C)
Mesophilic: 308.15 K (35°C) - Most common
Thermophilic: 328.15 K (55°C) - For fiber-rich substrates

Outputs¶

The step() method returns a dictionary containing: - Q_gas, Q_ch4, Q_co2: Gas production rates [m³/d] - pH: pH value - VFA: Volatile fatty acids [g/L] - TAC: Total alkalinity [g CaCO3/L]

Hydrolysis¶

Pre-treatment tank for hydrolysis-dominated processes (Stub for future implementation).

Separator¶

Solid-liquid separation for digestate processing (Stub for future implementation).

Process Monitoring¶

Monitoring key indicators is crucial for stable operation: - pH value: Should be between 6.8 and 7.5. - VFA/TAC ratio: Should be below 0.4. - Methane content: Typically > 55%.