reducing fresh water consumption in high water volume consuming industries by recycling aop- treated...
TRANSCRIPT
Reducing fresh water consumption in high water volume consuming industries by recycling AOP-
treated effluents “AOP4Water”
Zmanjševanje porabe sveže vode v industriji s ponovno uporabo (recikliranjem) očiščenih odpadnih voda
13. oktober 2011, Ljubljana
Pregled in koncept projekta ter prvi rezultati
Trajanje: 01 januar 2011 – 31 december 2012 dr. Aleksandra Krivograd Klemenčič
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outline
Initial situation
AOPs for advanced effluent treatment
Project objectives
Execution, time frame
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Initial situation
O3 for advanced effluent treatment :
many advantages, good results and experience
BUT: not always economical worthwhile
Make O3-treatment more attractive:
Combination with H2O2, UV, Ultrasound
Regions with a lack of freshwater
new water sources needed
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AOP in effluent treatment
Ozone:
turns residual COD into biodegradable compounds
COD ↓, BOD5 ↑, BOD5/COD ↑
ozone stage
biofilterbiological treatment
paper production receiving water
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Goal (re-)use of AOP-treated effluents instead of freshwater
(re-)use in
• Pulp and paper mills
• Textile industry
Source: effluents from
• Pulp and paper mills
• Food processing industry
• Textile industry
• Municipal waste water
Key to (re-)use:
improve the efficiency of AOP-treatment
to ensure optimum water quality
to show the possible use of the treated water
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Execution
WP 8
sustainability studies
WP 2Factory investigations
WP 3AOP trials with effluents
(paper mills, textile, municipal, food)
WP 4 Biodegradability-trials
WP 5 Mathematical Modelling (Data
analyses and system identification)
WP 6Impact of water(re-)use on process
water and product quality
WP 7Water-treatment concepts
AQP
AQP
UL
UL
PTS
Celabor
Celabor
WP 1Coordination
WP 9
Dissemination and use
PTS
PTS
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Time frame
1.0 1.0 1.0
1.0 1.0
1.0 1.01.0
2.0 1.0 0.5 0.5
1.0 1.0 1.0 1.0
2.0 1.0 1.0 1.02.0 1.0 1.0 1.0
0.5 0.5 0.5 0.5
0.5 0.5 0.5 0.5
1.0 0.5 0.5 0.5 0.50.5 1.0 0.5 0.5 0.5
0.5 0.5
0.5 0.5
1.0 1.0 1.0 1.0
1.0 1.0 1.0
0.5 0.5 0.5 0.50.5 0.5 0.5 0.5
1.0 1.0 1.0
1.0 1.0 1.0
0.5 0.5 0.5 0.5 0.5 0.5 1.0 1.0
1.0 1.0
MonthsWorkpakages
04 - 06 10 - 1207 - 0901 - 03 22 - 2413 - 15 16 - 18 19 - 21
WP 9Dissemination and use
WP 8Sustainability studies
WP 7Water-treatment concepts
WP 6Impact on product and water circuit
WP 1Coordination
WP 5Mathematical Modelling (Data analyses and system identification)
WP 4Biodegradability-trials
WP 3AOP-trials with effluents (paper mills, textile, municipal, food)
WP 2Factory investigations
Selected textile industries
TSP Maribor d.d.
POLZELA socks and stockings factory d.d.
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Options of reuse of AOP-treated wastewater in textile industry
- in dyeing process- in washing process- ?
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Reservoir
System pump
2.4 L/min
OzonationGenerator: 200-400 mg/hInternal air pump: 4-5 L/minVentouri ozone injector
Hydrogen Peroxide pump, 2.7 mL/min
Hydrogen Peroxide
UV> 40 mJ/cm2λ = 253nmMax. discharge: 15 L/min
Redox, pH, O2 samplers
IzVRS and ECHO Ltd. designed and constructed lab-scale pilot plant for performing AOP-trials
UV TRIALS O3 TRIALS H2O2 TRIALS
Task 3.2: AOP trials – technologies used individually
Two parameters were chosen to be followed in the preliminary trials: COD and colouration.
Sampling point (at POLZELA socks and stockings factory):wastewater from the production of textiles – outflow from the equalization pond (where partial self-neutralization is present as acidic and alkaline wastewater is mixed)
Results: UV TRIALSDate Number of
cyclesProcessing time
(min)Processing time
(s)COD (mg/L) Colour (455 nm)
[units PtCo]Colour residue
(%)1.7.2011 0 0' start 0 340 - -
1.7.2011 1 1' 60 335 - -
1.7.2011 2 2' 120 331 - -
1.7.2011 5 5' 300 328 - -
1.7.2011 10 10' 600 333 - -
1.7.2011 20 20' 1200 327 - -
1.7.2011 50 50' 3000 330 - -
1.7.2011 100 100' 6000 323 - -
1.7.2011 200 200' 12000 287 - -
4.7.2011 4320 3days 259200 188 775 46,69
4.7.2011 3days - raw sample
317 1660 100
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Results: UV TRIALS
λ = 253 nm
Q = 2.4 L/min
V = 2.4 L
1 10 100 1000 10000 100000 10000000
50
100
150
200
250
300
350
400 COD
CO
D [
mg
/L]
TIME [s]
Results: O3 TRIALS
Date Number of cycles
Processing time (min)
Processing time (s)
COD (mg/L) Colour (455 nm)[units PtCo]
Colour residue (%)
4.7.2011 0 0' start 0 312 - -
4.7.2011 1 2' 120 304 - -
4.7.2011 2 4' 240 299 - -
4.7.2011 5 10' 600 298 - -
4.7.2011 10 20' 1200 303 - -
4.7.2011 20 40' 2400 283 - -
4.7.2011 50 100' 6000 263 497 100
4.7.2011 100 200' 12000 234 279 56
5.7.2011 720 1 day 86400 79 94 19
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Results: O3 TRIALS
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0 20000 40000 60000 80000 1000000
100
200
300
400
500
600
CO
D [
mg
/L]
CO
LO
UR
AT
ION
[P
tCo
]
TIME [s]
COD COLOURATION
Q = 2.4 L/minV = 4.8 LQO3 = 500 mg/h
Results: H2O2 TRIALS
Date Number of cycles
Processing time (min)
Processing time (s)
COD (mg/L) Colour (455 nm)[units PtCo]
7.7.2011 0 0' start 0 286 1803
7.7.2011 1 2' 120 1001 1779
7.7.2011 2 4' 240 1419 1744
7.7.2011 5 10' 600 2574 1712
7.7.2011 10 20' 1200 4684 1611
7.7.2011 20 40' 2400 11100 1499
7.7.2011 50 100' 6000 15200 1497
7.7.2011 100 200' 12000 15900 1295
8.7.2011 720 1d 86400
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Results: H2O2 TRIALS
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0 2000 4000 6000 8000 10000 12000
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
CO
LO
UR
AT
ION
[P
tCo
]
CO
D [
mg
/L]
COD
TIME [s]
0
200
400
600
800
1000
1200
1400
1600
1800 COLOURATION
Q = 2.7 L/minV = 4.8 L2.7 mL of 30% H2O2 per min added
CONCLUSIONS
• COD decrease: ozonation at the applied ozone concentration proved to be more efficient compared to UV irradiation (25% remaining COD at ozonation compared to 55% at UV irradiation)
• COLOURATION: ozonation proved to be much more efficient compared to peroxide application in colour removal (19% remaining colouration at ozonation compared to 72% at peroxide application)
• The amount of H2O2 added needs to be adjusted and
surplus avoided
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FURTHER TRIALS Task 3.2: AOP trials – technologies used individually
POLZELA (Textile factory A):
Repetitions of experiments with separately applied methods (UV, O3
and H2O2) (Autumn 2011)
Performing experiments with Cavitation (Autumn 2011)
Parameters to be analyzed: COD, BOD5, Colour, Nitrate, Nitrite, TSS, pH, Total hardness, Sulphate, Chloride, Iron, Manganese, Copper, Alkalinity, Turbidity
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TSP (Textile factory B)?, municipal wastewater, removal of pharmaceuticalsTrials planned to be performed in 2012
FURTHER TRIALS Task 3.3: AOP trials – technologies used combined
POLZELA (Textile factory A):
UV +O3 (Autumn 2011)
H2O2 + O3 (Autumn 2011)
US + O3 (Autumn 2011)
US +UV (Autumn 2011)
US+ H2O2 + O3 (Autumn 2011)
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TSP (Textile factory B), municipal wastewater, removal of pharmaceuticalsTrials planned to be performed in 2012