Unit Operations

This page lists the unit operation modules available in QSDsan. Unit operations are organized into three primary categories:

• bst units are thin wrappers that make a real BioSTEAM unit operation usable in QSDsan (same core BioSTEAM simulate/design/cost logic, plus QSDsan stream compatibility). They are used the same way as native QSDsan units; for parameters and behavior specific to the BioSTEAM parent class, see the BioSTEAM documentation.

• static units have no working dynamic-state contract – running them with isdynamic=True would error.

• dynamic units can run in dynamic mode – isdynamic=True works, whether that capability is native to the unit or inherited from a BioSTEAM-wrapper base class (e.g. Mixer, Splitter, Pump).

• BioSTEAM-Inherited Units
• Static Units
• Dynamic Units

List of Unit Operations

1. Category indicates the unit operation category (bst, static, or dynamic).

2. Abstract indicates that design, costing, and environmental impact algorithms are not implemented.

3. API page links to the detailed documentation page. Some units appear both on a category page and on their implementation module page.

Category All bst static dynamic Abstract All Yes No

Unit	Category	Abstract	API page
ADMtoASM	dynamic	Yes	dynamic/junction/ADMtoASM
AnMBR (anaerobic membrane bioreactor)	dynamic	No	dynamic/membrane_bioreactor/AnMBR
ActivatedSludgeProcess	static	No	static/ActivatedSludgeProcess
AerobicDigester	dynamic	No	dynamic/suspended_growth_bioreactor/AerobicDigester
AnaerobicBaffledReactor	static	No	static/anaerobic_reactor/AnaerobicBaffledReactor
AnaerobicCSTR	dynamic	No	dynamic/anaerobic_reactor/AnaerobicCSTR
AnaerobicDigestion	static	No	static/anaerobic_reactor/AnaerobicDigestion
ASMtoADM	dynamic	Yes	dynamic/junction/ASMtoADM
BatchExperiment	dynamic	Yes	dynamic/suspended_growth_bioreactor/BatchExperiment
BeltThickener	static	No	static/sludge_thickening/BeltThickener
BinaryDistillation	bst	No	bst/distillation/BinaryDistillation
BiogasCombustion	static	Yes	static/combustion/BiogasCombustion
CatalyticHydrothermalGasification	static	No	static/hydrothermal/CatalyticHydrothermalGasification
CombinedHeatPower	static	No	static/combustion/CombinedHeatPower
CSTR (continuously stirred tank reactor)	dynamic	No	dynamic/suspended_growth_bioreactor/CSTR
CompletelyMixedMBR	dynamic	No	dynamic/membrane_bioreactor/CompletelyMixedMBR
ComponentSplitter	static	Yes	static/abstract/ComponentSplitter
Copier	static	Yes	static/non_reactive/Copier
CropApplication	static	Yes	static/CropApplication
DryingBed	static	No	static/treatment_bed/DryingBed
DynamicInfluent	dynamic	Yes	dynamic/DynamicInfluent
ElectrochemicalCell	static	No	static/ElectrochemicalCell
Excretion	static	No	static/Excretion
FakeSplitter	bst	Yes	bst/abstract/FakeSplitter
Flash	bst	No	bst/Flash
FlatBottomCircularClarifier	dynamic	No	dynamic/clarifier/FlatBottomCircularClarifier
HeatExchangerNetwork	bst	No	bst/heat_exchanging/HeatExchangerNetwork
HXprocess	bst	No	bst/heat_exchanging/HXprocess
HXutility	bst	No	bst/heat_exchanging/HXutility
HydraulicDelay	dynamic	Yes	dynamic/abstract/HydraulicDelay
HydrothermalLiquefaction	static	No	static/hydrothermal/HydrothermalLiquefaction
Hydroprocessing	static	No	static/hydroprocessing/Hydroprocessing
IdealClarifier	static	No	dynamic/clarifier/IdealClarifier
IsothermalCompressor	bst	No	bst/compressor/IsothermalCompressor
Junction	dynamic	Yes	dynamic/junction/Junction
InternalCirculationRx	static	No	static/InternalCirculationRx
Lagoon	static	No	static/Lagoon
LiquidTreatmentBed	static	No	static/treatment_bed/LiquidTreatmentBed
LumpedCost	static	No	static/non_reactive/LumpedCost
MembraneDistillation	static	No	static/MembraneDistillation
MembraneGasExtraction	dynamic	No	dynamic/MembraneGasExtraction
MixTank	bst	No	bst/tank/MixTank
Mixer	dynamic	Yes	dynamic/abstract/Mixer
MURT (multi-unit reinvented toilet)	static	No	static/toilet/MURT
PFR (plug flow reactor)	dynamic	No	dynamic/suspended_growth_bioreactor/PFR
PhaseChanger	static	Yes	static/abstract/PhaseChanger
PitLatrine	static	No	static/toilet/PitLatrine
PolishingFilter	static	No	static/PolishingFilter
PrimaryClarifier	dynamic	No	dynamic/clarifier/PrimaryClarifier
Pump	dynamic	No	dynamic/pumping/Pump
Reactor	static	No	static/Reactor
ReversedSplitter	bst	Yes	bst/abstract/ReversedSplitter
Sampler	dynamic	Yes	dynamic/abstract/Sampler
Screening	static	No	static/Screening
Sedimentation	static	No	static/Sedimentation
SepticTank	static	No	static/SepticTank
SludgeCentrifuge	static	No	static/sludge_thickening/SludgeCentrifuge
SludgeDigester	static	Yes	static/anaerobic_reactor/SludgeDigester
SludgePasteurization	static	No	static/SludgePasteurization
SludgePump	static	No	static/pumping/SludgePump
SludgeThickening	static	Yes	static/sludge_thickening/SludgeThickening
SludgeSeparator	static	Yes	static/sludge_thickening/SludgeSeparator
Splitter	dynamic	Yes	dynamic/abstract/Splitter
StorageTank	bst	No	bst/tank/StorageTank
Tank	bst	Yes	bst/tank/Tank
Toilet	static	Yes	static/toilet/Toilet
Trucking	static	No	static/Trucking
UDDT (urine diverting dry toilet)	static	No	static/toilet/UDDT
WWTpump (wastewater treatment pump)	static	No	static/pumping/WWTpump