Peracetic Acid Disinfection (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

Electricity consumption is calculated using the constant_intensity helper function. See documentation for Helper Methods for Electricity Demand.

Costing Method

Costing is calculated using the cost_peracetic_acid() method. For full details on costing, see documentation for the zero-order costing package.

Additional Variables

Description	Variable Name	Units
Hydraulic retention time of water treatment unit	HRT	\(h\)
Average mass of an E. coli cell	ecoli_cell_mass	\(kg\)
Weight fraction of PAA in disinfection solution	disinfection_solution_wt_frac_PAA	\(dimensionless\)
Disinfection solution density	disinfection_solution_density	\(kg/l\)
Volumetric flowrate of disinfection solution	disinfection_solution_flow_vol	\(l/s\)
Volume of water treatment unit	reactor_volume	\(m^3\)
Concentration of E. coli at reactor inlet	inlet_ecoli_conc	\(1/l\)
Concentration of E. coli at reactor outlet	outlet_ecoli_conc	\(1/l\)

Additional Constraints

Description	Constraint Name
Constraint for disinfection solution flowrate	disinfection_solution_flow_vol_rule
Constraint for reactor volume	reactor_volume_rule
Constraint for E. coli inlet concentration	ecoli_inlet_concentration_rule
Constraint for E. coli outlet concentration	ecoli_outlet_concentration_rule

Class Documentation

This module contains a zero-order representation of a peracetic acid (PAA) water disinfection unit.

class watertap.unit_models.zero_order.peracetic_acid_disinfection_zo.PeraceticAcidDisinfectionData(component)

Zero-Order model for a peracetic acid water disinfection 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_peracetic_acid(blk)

General method for costing peracetic acid water disinfection.

class watertap.unit_models.zero_order.peracetic_acid_disinfection_zo.PeraceticAcidDisinfectionZO(*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:

(PeraceticAcidDisinfectionZO) New instance