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.
For full details on costing, 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.
- isothermal
Isothermal assumption, or ignore temperature variables in unit. Default=True
- isobaric
Isobaric assumption, or ignore pressure variables in unit. Default=True
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)[source]
Zero-Order model for a Coagulation/Flocculation unit operation.
- build()[source]
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
- static cost_coag_and_floc(blk)[source]
General method for costing coagulation/flocculation processes. Capital cost is based on the alum flowrate and the polymer flowrate of the incoming stream. This method also registers the electricity demand as a costed flow.