###############################################################################
# WaterTAP Copyright (c) 2021, The Regents of the University of California,
# through Lawrence Berkeley National Laboratory, Oak Ridge National
# Laboratory, National Renewable Energy Laboratory, and National Energy
# Technology Laboratory (subject to receipt of any required approvals from
# the U.S. Dept. of Energy). All rights reserved.
#
# Please see the files COPYRIGHT.md and LICENSE.md for full copyright and license
# information, respectively. These files are also available online at the URL
# "https://github.com/watertap-org/watertap/"
#
###############################################################################
"""
This module contains a zero-order representation of a Chlorination unit.
"""
from pyomo.environ import units as pyunits, Var
from idaes.core import declare_process_block_class
from watertap.core import build_siso, constant_intensity, ZeroOrderBaseData
# Some more information about this module
__author__ = "Kurban Sitterley"
[docs]@declare_process_block_class("ChlorinationZO")
class ChlorinationZOData(ZeroOrderBaseData):
"""
Zero-Order model for a Chlorination unit operation.
"""
CONFIG = ZeroOrderBaseData.CONFIG()
[docs] def build(self):
super().build()
self._tech_type = "chlorination"
build_siso(self)
constant_intensity(self)
self.initial_chlorine_demand = Var(
self.flowsheet().time,
units=pyunits.mg / pyunits.liter,
doc="Initial chlorine demand",
)
self.contact_time = Var(
self.flowsheet().time, units=pyunits.hour, doc="Chlorine contact time"
)
self.concentration_time = Var(
self.flowsheet().time,
units=(pyunits.mg * pyunits.minute) / pyunits.liter,
doc="CT value for chlorination",
)
self.chlorine_decay_rate = Var(
self.flowsheet().time,
units=pyunits.mg / (pyunits.L * pyunits.hour),
doc="Chlorine decay rate",
)
self.recovery_frac_mass_H2O.fix(1)
self._fixed_perf_vars.append(self.initial_chlorine_demand)
self._fixed_perf_vars.append(self.contact_time)
self._fixed_perf_vars.append(self.concentration_time)
self._fixed_perf_vars.append(self.chlorine_decay_rate)
self.chlorine_dose = Var(
self.flowsheet().time, units=pyunits.mg / pyunits.L, doc="Chlorine dose"
)
@self.Constraint(self.flowsheet().time, doc="Chlorine dose constraint")
def chlorine_dose_constraint(b, t):
return b.chlorine_dose[t] == self.initial_chlorine_demand[
t
] + self.chlorine_decay_rate[t] * self.contact_time[t] + (
self.concentration_time[t]
/ pyunits.convert(self.contact_time[t], to_units=pyunits.minute)
)
self._perf_var_dict["Chlorine Dose (mg/L)"] = self.chlorine_dose
self._perf_var_dict[
"Initial Chlorine Demand (mg/L)"
] = self.initial_chlorine_demand
self._perf_var_dict["Contact Time (hr)"] = self.contact_time
self._perf_var_dict["CT Value ((mg*min)/L)"] = self.concentration_time
self._perf_var_dict[
"Chlorine Decay Rate (mg/(L*hr))"
] = self.chlorine_decay_rate