4b. Filterability MBR Sludge

1

CIE4485

Wastewater Treatment

Maria Lousada Ferreira

4. Research on MBR sludge filterability at MBR Terneuzen

www.evides.nl

Maria Ferreira - Evides

Research on MBR sludge filterability at MBR

Terneuzen

www.evides.nl

Table of contents

1. Introductiona) MBR Terneuzen

2. Filterabilitya. Temperatureb. Substrate c. Sludge coagulantsd. Influent compositione. Effluent additionf. Mechanical stress

3. Conclusions

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Introduction- MBR Terneuzen

WWTPLocation Braakmanpumping station(drinking water production)

DECO plant

Town of Terneuzen

DOW

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Production capacity: 620 m/hr

DECO

EffluentEGV 2500 S/cm

Demi waterEGV < 15 S/cm

E.W.R.O.: 2 units

A.S.

tussenbuffertussenbuffer tussenbuffer

B.W.R.O. : 2 units

NaOH

BraakmanEffluentank

Freshwater

NaOCl

NH4Cl

MBR

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1,000 3,100 m3/h

influent effluent

Industrial reuse

Addition clarifier overflow

MBR

20%

80%

400 620 m3/h


Addition waste sludge

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MBR Terneuzen(TheNetherlands)Populationequivalent 15,500Locationofthemembranes External(Sidestream)Membranesupplier Pentair(Xflow)Membraneporesize m 0.045(...)Totalmembranearea m2 13,860Volumebiologicaltanks m3 784(aerobic)652(anoxic)Flux(averageoperation) L/m2.h 2540MLSS g/L 8

Sludgeage d 20Cleaning Mechanicalandchemical

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Introduction-MBR Terneuzen

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Introduction- MBR terneuzen

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Filterability

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0

1

2

3

4

5

6

7

10-8

-201

0

18-1

1-20

10

26-2

-201

1

6-6-

2011

14-9

-201

1

23-1

2-20

11

1-4-

2012

10-7

-201

2

18-1

0-20

12

26-1

-201

3

R20

[*10

12m

-1]

MBR

CAS

Filterability

R20< 0.1 Good0.1

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Filterability and temperature

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Filterability and temperature

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Filterability and temperature in 7 full-scale MBRs(6 with submerged membranes, 1 with side-stream membranes) [Moreau, 2011]

Relation between filterability and temperature is overall

accepted.

Temperature has an indirect effect on filterability

Flocculation,viscosity,

FilterabilityFilterability

Temperature

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Filterability and substrate

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FlowProportionalto

realMBRsituation

FlowAppliedinthesubstratebatchtests

F/MAppliedinthesubstratebatchtests

[gBOD5/gMLSS.d]

Day1 Day2andDay3

Glycerol 0.25mL/d 0.25L/d 1.07 0.24Kwalidrink 2mL/d 2L/d 2.1 0.54

Air

Batch tests (long term: 4 days)

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Batch tests: long term (MBR Terneuzen)

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0

2

4

6

8

10

MBR+glycerol MBR+kwalidrink

R20

[*10

12m

-1]

DR20 day 1

DR20 day 4

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Filterability and sludge coagulants

Commercialname Company CompositionPAX14 KemwaterTM PolyaluminiumChlorideMPE50 Nalco Polymers

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Date MLSS sludge[g/L] L Enhancer/kg MLSSPAX-14

19-March-12 6.6 0.2126-March-12 3.89 0.0724-April-12 6.18 0.16

MPE 5014-March-12 6.16 0.04

3-May-12 6.22 0.043-May-12 6.22 0.023-May-12 6.22 0.01

Batch tests (short term: hour)

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0,0

0,5

1,0

1,5

2,0

2,5

3,0

MBR+PAX (0,21) MBR+PAX (0,07) MBR+PAX (0,16)

R20

[*10

12m

-1]

DR20original

DR20MBR+fluxenhancer

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0,0

0,5

1,0

1,5

2,0

2,5

3,0

MBR

+M

PE

(0,0

4)

MBR

+M

PE

(0,0

4)

MBR

+M

PE

(0,0

2)

MBR

+M

PE

(0,0

1)

R20

[*10

12m

-1]

DR20original

DR20MBR+fluxenhancer


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Filterability and influent composition

1. Koegors land fill1. About 30 years; no longer in use.2. Until the 80s: domestic use3. After the 80s: non-toxic industrial waste

2. Indaver- Location Hoek1. Dangerous waste Indaver Gevaarlijk

Afval2. Transfer location, wastewater treatment

plant and cleaning installation for trucks and trains.

3. Started discharging: 23 january 2012

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Filterability and influent composition

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0

1

2

3

4

5

6

7

0

100

200

300

400

500

600

700

18-1

1-10

26-0

2-11

06-0

6-11

14-0

9-11

23-1

2-11

01-0

4-12

10-0

7-12

18-1

0-12

R20

[*10

12m

-1]

leac

hate

flow

[m3 /d

]leachateflow

DR20

10 per.Mov.Avg.(leachateflow)

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Filterability and effluent addition

Hypothesis: Effluent addition leads to the accumulation of submicron particles in the MBR sludge

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0

2

4

6

8

10

0,0

0,2

0,4

0,6

0,8

1,0

MBR+effluent MBR+influent MBR+influent+effluent

MLS

S[g

/L]

R20

[*10

12m

-1]

DR20 day 1DR20 day 4MLSS day 1MLSS day 4

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Filterability and effluent addition

Day1[L]Supernatantremoved

Day2[L] Supernatantremove

d

Day3[L]Supernatantremoved

Day4[L]

sludge influenteffluent sludge influent effluent sludge influenteffluent sludge influenteffluent

MBR+influent 20 5 0 0 5 0 0 1 0 0 0 0

MBR+effluent 20 5 0 0 5 0 0 1 0 0 0 0

MBR+influent+effluent 20 2,5 2,5 0 0 2,5 2,5 0 0 0,5 0,5 0 0 0 0

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Filterability and mechanical stress

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0

1

2

3

0

400

800

1200

1600

2000

0 15 30 45 60 75 90

R20

[*10

12m

-1]

Rot

atio

n sp

eed

[rpm

]

Time [minutes]

T=10oC

-1

1

2

3

4

0

400

800

1200

1600

2000

0 15 30 45 60 75 90

R20

[*10

12m

-1]

Rot

atio

n sp

eed

[rpm

]

Time [minutes]

T=26oC

Low stress

High stress

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30

35

40

0

400

800

1200

1600

2000

0 15 30 45 60 75 90

Floc

siz

e [m

]

Rot

atio

n sp

eed

[rpm

]

Time [minutes]

T=10oC

30

35

40

45

0

400

800

1200

1600

2000

0 15 30 45 60 75 90

Floc

siz

e [m

]

Rot

atio

n sp

eed

[rpm

]

Time [minutes]

T=26oC

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Bioreactor

Membranes

Air

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Conclusions

The effect of different factors in filterability has to be evaluated by analyzing each factor separatly.

The influence of temperature on filterability is always present.

Excess of substrate can deteorate filterability; the substrate itselft is not toxic but the amount might be.

Filterability can be improved with coagulants.

Influent composition, effluent addition and mechanical stress are likely to influence filterability.

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Documents

4b. Filterability MBR Sludge