SS304/316L
Multiple
Effect
Evaporation
System
for
Dye
Wastewater
—
Ammonium
Sulfate
Recovery
Hanpu
designs
Multiple
Effect
Evaporation
(MEE)
plants
in
SS304/SS316L
specifically
for
dye
&
dye-intermediate
wastewater.
The
system
concentrates
sulfate-rich
streams
and
integrates
vacuum
crystallization
to
recover
ammonium
sulfate
(AS)
as
a
reusable
salt,
cutting
disposal
cost
and
enabling
ZLD/near-ZLD
compliance
with
optimized
OPEX.
Engineered
Materials
Product-wetted
parts
in
SS316L
for
corrosive,
colored
liquors;
structural
and
utility
lines
in
SS304
for
value
optimization.
Elastomers
and
gaskets
matched
to
pH
and
solvent
exposure.
Color
&
Organics
Tolerance
Stable
low-ΔT
operation
and
high-shear
distribution
reduce
fouling;
optional
decolorization
or
carbon
polishing
can
be
integrated
upstream.
Ammonium
Sulfate
Payback
Concentrated
mother
liquor
feeds
the
vacuum
crystallizer
to
produce
marketable
AS
crystals
with
controlled
particle
size
for
storage
and
sale.
Process
Overview
-
Feed
Conditioning:
Screening/filtration,
pH
trim,
anti-scalant,
and
optional
defoamer
to
stabilize
dye
effluent.
-
Multi-Effect
Evaporation:
Live
steam
heats
Effect-1;
generated
vapors
cascade
to
downstream
effects
running
at
progressively
lower
pressure
and
temperature.
-
Concentration
Control:
Online
density/conductivity
governs
recycle/discharge;
clean
condensate
is
recovered
for
reuse
or
polishing.
-
Vacuum
Crystallization
(AS):
Concentrate
is
cooled
under
vacuum
to
crystallize
ammonium
sulfate;
crystals
are
separated
by
centrifuge
and
dried.
-
Utilities
&
Emissions:
Surface
condenser
with
vacuum
package;
non-condensables
safely
vented;
minimal
cooling
water
through
heat
recovery.
Technical
Snapshot
(Illustrative)
|
Item
|
Typical
Range
/
Note
|
|
Evaporation
capacity
|
3–20
t/h
per
train
(customized
to
plant
load)
|
|
Steam
economy
|
~3.0–4.0
kg
water/kg
steam
(higher
with
TVR/MVR
add-ons)
|
|
Boiling
temperature
(last
effect)
|
~45–60
°C
under
vacuum
to
limit
scaling
&
color
set
|
|
Materials
of
construction
|
SS316L
(product
side),
SS304
(non-product
&
structure);
duplex/titanium
optional
for
aggressive
chemistries
|
|
Automation
|
PLC/HMI
with
historian;
refractometer/density
loops;
surge
&
vacuum
interlocks;
remote
diagnostics
|
|
Ammonium
sulfate
product
|
Crystal
size
tuned
via
residence
time/seed
loading;
downstream
centrifuge
&
dryer
packages
available
|
|
CIP
strategy
|
Heated
alkaline/acid
cycles;
recipe
library
based
on
pilot
data
and
fouling
index
|
|
Utilities
|
Reduced
fresh
steam
and
cooling
demand
through
staged
heat
reuse;
power
sized
to
pumps
&
vacuum
|
Key
Benefits
-
Lower
OPEX:
Multi-effect
energy
reuse
with
optional
TVR/MVR
modules.
-
High
Availability:
Falling-film
design
with
anti-fouling
distribution;
long
runs
between
CIP.
-
Compliance-Ready:
Documentation
for
environmental
audits,
pressure-part
codes,
and
safety.
-
Revenue
from
AS:
Turn
sulfate
burden
into
saleable
ammonium
sulfate
crystals.
System
Views
Scope
&
Deliverables
-
Process
design
pack:
PFD/P&ID,
heat
&
mass
balance,
control
narrative,
utility
list.
-
Skid-mounted
effects,
separators,
surface
condenser,
vacuum
system,
pumps
&
instrumentation.
-
Integrated
AS
crystallizer,
centrifuge
and
dryer
(optional
modules).
-
Commissioning,
performance
testing
to
guaranteed
KPIs,
and
operator
training.
Applications
-
Dye
&
dye-intermediate
wastewater
concentration
with
ammonium
sulfate
recovery.
-
RO
reject
and
high-TDS
mixed
effluents
in
chemical
processing
zones.
-
Integration
with
biological/advanced
oxidation
for
color
&
COD
polishing.
About
Hanpu
Hanpu
delivers
energy-saving
MEE/MVR
systems
in
stainless
steel
for
challenging
industrial
effluents.
Our
EPC
approach
shortens
schedules,
stabilizes
lifetime
OPEX,
and
provides
reliable
compliance
for
chemical,
dye,
pharmaceutical,
and
mineral
processing
clients
worldwide.