Electrochemical Nutrient Removal (ZO)

Model Type

This unit model is formulated as a reactive single-inlet, double-outlet model form. See documentation for reactive single-inlet, double-outlet 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_electrochemical_nutrient_removal() method. For full details on costing, see documentation for the zero-order costing package.

Additional Variables

Description	Variable Name	Units
Electricity consumption of unit	electricity	\(kW\)
Electricity intensity with respect to phosphorus removal	energy_electric_flow_mass	\(kWh/kg\)
Dosage of magnesium chloride per phosphorus removal	magnesium_chloride_dosage	\(dimensionless\)
Magnesium chloride flowrate	MgCl2_flowrate	\(kg/h\)

Additional Constraints

Description	Constraint Name
Constraint for electricity consumption based on phosphorus removal	electricity_consumption
Constraint for magnesium chloride demand based on phosphorus removal.	MgCl2_demand

Class Documentation

This module contains a zero-order representation of an electrochemical nutrient recovery unit.

class watertap.unit_models.zero_order.electrochemical_nutrient_removal_zo.ElectroNPZO(*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:

(ElectroNPZO) New instance

class watertap.unit_models.zero_order.electrochemical_nutrient_removal_zo.ElectroNPZOData(component)

Zero-Order model for an electrochemical nutrient recovery unit.

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

static cost_electrochemical_nutrient_removal(blk)

General method for costing electrochemical nutrient recovery. Capital cost is based on the volumetirc flowrate and HRT of the incoming stream. Chemical dosing cost is based on MgCl2 cost. This method also registers the electricity demand as a costed flow.