Unit Operations

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

• bst units inherit from BioSTEAM unit operations and add QSDsan behavior while remaining steady-state. They are used the same way as native QSDsan units; for parameters and behavior specific to the BioSTEAM parent class, see the BioSTEAM documentation.

• QSDsan static units are QSDsan-native unit operations without dynamic state equations.

• QSDsan dynamic units are QSDsan-native unit operations with dynamic state, derivative state, ODE, or algebraic-equation behavior.

• BioSTEAM-Inherited Units
• Static QSDsan Units
• Dynamic QSDsan Units

List of Unit Operations

1. Category indicates the unit operation category (BST, QSDsan static, or QSDsan 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 QSDsan static QSDsan dynamic Abstract All Yes No

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