16-7-2012
Examples of wastewaters of a textile industry
Technologies for low and
medium concentrated streams
in textile finishing industry for
water reuse purposes
Some examples of different processes
Spagni A.1, Vajnhandl S.2, Farina R.1, Majcen Le Marechal A.2
2University of
H2O dist.
1 ENEA, Bologna, Italy
Maribor, Maribor, Slovenia
Batch effluents from different phases of cotton dyeing
Aquafit4use End Congress
Bruges, Belgium, 8-9 May 2012
H2O dist.
Situation in the textile sector for
water ruese
Wells
Softening
Storage
Reusability criteria/guidelines
Parameter
pH
Conductivity
Suspended solids
Turbidity
COD
Colour
Uses
Watewater
3
Proposed Value
6.5-8.0
1.5 mS/cm
10 mg/L
1 NTU
60 mg/L
<0.01
4
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Treatability criteria: definition of low
concentrated textile wastewater
Parameter
pH
Medium concentrated textile wastewater
Medium concentrated streams have been defined as all
mix wastewater after separation of the most
concentrated ones coming from specific machines in
the factory;
These medium concentrated streams have too high
organic content to be cost-efficiently treated just by
proposed physical-chemical techniques (UF, NF)
and/or AOP;
Proposed Value
<10
Conductivity
<3 mS/cm*
Suspended solids
200 mg/L
Turbidity
COD
20 NTU
300 mg/L
Colour
<0.5
Biological treatment was added and MBR was tested
with anaerobic pretreatment: MBR effluent was
further treated by UV/H2O2 technology or NF.
*If high chloride concentration is present the value decrease to 1.6
5
Schematic of the studied treatment technologies
for textile wastewater treatment for reuse
Coagulation
6
Schematic of the Nanofiltration pilot
plant
Ultrafiltration
Gauge and
Pressure control
Gauge
AOP
Wastewater
MF
Treated Water
[MF]
Concentrate
Nanofiltration
Biological
NF
Permeate
[Concentrates]
Evapoconcentration
Pump
and Filter
Wastewater
Waste
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Nanofiltration pilot-plant
Schematic of the pilot plant for Ultrafiltration
Blower
P2
Effluent
BackPuls vessel
P3
Screen
Storage tank
at the industry
P1
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Schematic of the MBR pilot
Gasmeter
Blower
P2
Effluent
BackPuls vessel
P3
Anaerobic biofilter
Aerobic MBR
Screen
Storage tank
at the industry
P1
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Batch UV/H2O2 Reactor
14
Pilot UV/H2O2 Reactor
Results
Filtration
02-07-2008
Administrative issues
16
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Effluent: DF/JIG/REA/D
Spectrum of the Sample treated by UF
1- Feed
2-3 Permeate and concentrate UF Spiral wounded
Absorbance
4-5 Permeate and concentrate NF
1- Feed
2-3 Permeate and concentrate UF Hollow fibre
4-5 Permeate and concentrate NF
1- Feed
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
WW6
UF P1
UF P2
UF C
400
2- After coagulation
500
3-4 Permeate and concentrate UF Hollow fibre
NF
Normalised (25°C) permeability (L25°C, L/m2 h bar)
600
700
Wavelength (nm)
Conductivity at 25°C sample treated by NF
Permeability WW3
3.5
3500
Conductivity 25°C (µS/cm)
3
L_25(L/(m2*h*bar)
2.5
2
1.5
1
0.5
0
WW3 P1
WW3 P2
WW3 P3
WW3 P4
WW3 P5
600
800
Samples
L filtered
from 1 m3
50
200
400
3000
2500
2000
Concentrates
1500
Permeates
1000
500
0
WW1
P1
C2 P2
C3 P3
C4 P4
C5 P5
Sample
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Spectrum treated by NF pilot plant
Spectrum WW1
Absorbance
2
P1
P2
1.5
P3
P4
P5
WW1
1
0.5
0
400
450
500
550
600
650
700
750
wavelength (nm)
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Spectrum of Sample N.3 (WW3) biological treated
(anaerobic biofilter combined with MBR) and after NF
treatment
Results
MBR
0.2
0.18
Absorbance
0.16
0.14
WW3
0.12
MBR
0.1
MBR NF P1
0.08
MBR NF P2
0.06
MBR NF P3
0.04
MBR NF P4
0.02
MBR NF P5
0
400
500
600
700
Wavelength (nm)
02-07-2008
Administrative issues
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Ultrafiltration
Membrane before and after use
Summary of the main results
Low concentrated WW
Summary of the main results
Medium concentrated WW
NF
WW
NF
200-600
COD<10
Parameter
COD (mg/L)
Conductivity
(mS/cm)
Abs
COD<30
0.4-0.6
UF
<1.0
COD=50-150
Abs<0.01
K=No Effect
Abs<0.5
COAG+UF
Parameter
WW
MBR
COD (mg/L)
500-1500
COD<100
Conductivity
(mS/cm)
Abs
1.5-4.0
K=No effect
0.2-1.0
Abs<0.05
K<0.2
K<1.0
<0.01
AOP
TOC<20
AOP
K=No Effect
TOC<5
Abs<0.01
COD=60-70
No Effect
K=1.5-3.0
Abs<0.01
Abs<0.02
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Reuse test
Concluding…
Proposed train technologies for water treatment
for reuse in the textile sector
Low Conc WW
UF
REUSE
NF
Middle
Conc WW
AOP
Biological
Concept for water ruese in the
textile sector
Thank you for your attention
Wells
Source 1
Storage 1
Uses A
Storage 2
Source 2
Uses B
Not
reusable
Reuse
WW 2
Treatment
WW 1
Reusable
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