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

2

outline

Initial situation

AOPs for advanced effluent treatment

Project objectives

Execution, time frame

3

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

4

AOP in effluent treatment

Ozone:

turns residual COD into biodegradable compounds

COD ↓, BOD5 ↑, BOD5/COD ↑

ozone stage

biofilterbiological treatment

paper production receiving water

5

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

6

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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9

Options of reuse of AOP-treated wastewater in textile industry

- in dyeing process- in washing process- ?

10

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

12

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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