Coagulation Flocculation (ZO)

Model Type

This unit model is formulated as a pass-through model form. See documentation for pass-through Helper Methods.

Electricity Consumption

The constraint used to calculate energy consumption is described in the Additional Constraints section below. More details can be found in the unit model class.

Costing Method

Costing is calculated using the cost_coag_and_floc method in the zero-order costing package. See documentation for the zero-order costing package.

Additional Variables

Description	Variable Name	Units
Dosing rate of alum	alum_dose	\(mg/l\)
Dosing rate of polymer	polymer_dose	\(mg/l\)
Ratio of anionic to cationic polymer in dosage	anion_to_cation_polymer_ratio	\(dimensionless\)
Dosing rate of anionic polymer	anionic_polymer_dose	\(mg/l\)
Dosing rate of cationic polymer	cationic_polymer_dose	\(mg/l\)
Mass flow rate of chemical solution	chemical_flow_mass	\(kg/s\)
Mass flow rate of chemical solution	chemical_flow_mass	\(kg/s\)
Rapid Mix Retention Time	rapid_mix_retention_time	\(s\)
Floc Retention Time	floc_retention_time	\(min\)
Rapid Mix Basin Volume	rapid_mix_basin_vol	\(m^3\)
Floc Basin Volume	floc_basin_vol	\(m^3\)
Number of Rapid Mixers	num_rapid_mixers	\(dimensionless\)
Number of Floc Mixers	num_floc_mixers	\(dimensionless\)
Number of Rapid Mix Processes	num_rapid_mix_processes	\(dimensionless\)
Number of Floc Processes	num_floc_processes	\(dimensionless\)
Number of Coagulation Processes	num_coag_processes	\(dimensionless\)
Number of Floc Injection Processes	num_floc_injection_processes	\(dimensionless\)
Rapid Mix Velocity Gradient	velocity_gradient_rapid_mix	\(1/s\)
Floc Velocity Gradient	velocity_gradient_floc	\(1/s\)
Rapid Mix Power Consumption	power_rapid_mix	\(kW\)
Floc Power Consumption	power_floc	\(kW\)
Total Power Consumption	electricity	\(kW\)

Additional Constraints

Description	Constraint Name
None	rapid_mix_basin_vol_constraint
None	floc_basin_vol_constraint
None	chemical_flow_constraint
None	chemical_flow_constraint
None	anionic_polymer_dose_constraint
None	cationic_polymer_dose_constraint
Constraint for rapid mix power consumption	rule_power_rapid_mix
Constraint for floc power consumption	rule_power_floc
Total power consumption	electricity_constraint

Class Documentation

This module contains a zero-order representation of a coagulation/flocculation unit operation.

class watertap.unit_models.zero_order.coag_and_floc_zo.CoagulationFlocculationZO(*args, **kwds)

Parameters

• rule (function) – A rule function or None. Default rule calls build().

• concrete (bool) – If True, make this a toplevel model. Default - False.

• ctype (class) –

  Pyomo ctype of the block. Default - pyomo.environ.Block

  Config args

  dynamic

  All zero-order models are steady-state only

  has_holdup

  Zero order models do not include holdup

  property_package

  Property parameter object used to define property calculations, default - useDefault. Valid values: { useDefault - use default package from parent model or flowsheet, PhysicalParameterObject - a PhysicalParameterBlock object.}

  property_package_args

  A ConfigBlock with arguments to be passed to a property block(s) and used when constructing these, default - None. Valid values: {see property package for documentation.}

  database

  An instance of a WaterTAP Database to use for parameters.

  process_subtype

  Process subtype to use when looking up parameters from database.

• initialize (dict) – ProcessBlockData config for individual elements. Keys are BlockData indexes and values are dictionaries with config arguments as keys.

• idx_map (function) – Function to take the index of a BlockData element and return the index in the initialize dict from which to read arguments. This can be provided to override the default behavior of matching the BlockData index exactly to the index in initialize.

Returns

(CoagulationFlocculationZO) New instance

class watertap.unit_models.zero_order.coag_and_floc_zo.CoagulationFlocculationZOData(component)

Zero-Order model for a Coagulation/Flocculation unit operation.

build()

General build method for UnitModelBlockData. This method calls a number of sub-methods which automate the construction of expected attributes of unit models.

Inheriting models should call super().build.

Parameters

None –

Returns

None