wastewater treatment and reuse by submerged membrane ...flat sheet mf membrane with pore size of 0.4...

Wastewater Treatment and Reuse by Submerged Membrane Bioreactor

(SMBR)

Assoc.Prof.Dr.Chavalit Ratanatamskul

Director of Research Unit on Wastewater Treatment and Reuse

Department of Environmental Engineering,Faculty of Engineering,

Chulalongkorn UniversityBangkok 10330, Thailand

Email: [email protected]

Principle of MBR Technology

Inflow(pre-treated wastewater)

Outflow(treated water,

free of micro-organisms)

Air

Activated sludge

Inflow(pre-treated wastewater)

Outflow(treated water,

free of micro-organisms)

Air

Activated sludge

MBR plants need little space and allow compact construction. Due to the direct retention of the micro-organisms, high efficiency is possible

and excess sludge can be reduced compared to conventional plants.

Performance of SMBR for Performance of SMBR for Treatment of Textile WastewaterTreatment of Textile Wastewater

Assoc.Prof.Dr.ChavalitAssoc.Prof.Dr.Chavalit RatanatamskulRatanatamskul

PilotPilot--scale MBR in Textile Industryscale MBR in Textile Industry

200mm×300mm

203Type

(0.1m2)

FLAT SHEET MF MEMBRANEFLAT SHEET MF MEMBRANE

Filtration

Micro Filtration

Ultra Filtration

Reverse osmosis

1A 10A 100A 1000A 1μ 10μ 100μ 1mm

ColiformKUBOTA

Average 0.4μ

Pore size of Membrane used in this study

Membrane BioreactorMembrane Bioreactor

Implemented membrane rack inside the MBR tank

Investigation ConditionInvestigation Condition

♦♦

Flat sheet MF membrane with pore size of 0.4 micron, submerged in MBR

♦

Raw wastewater from Textile Industry in eastern part of Thailand. The raw wastewater has been neutralized and then sent to pilot MBR plant.

♦

Investigate on effects of sludge age and intermittent aeration time on MBR performance for treatment of textile wastewater

Wastewater characteristics of Wastewater characteristics of Textile wastewaterTextile wastewater

PARAMETERSPARAMETERS UNITUNIT VALUEVALUEBODBOD55 mg/lmg/l 98.498.4

CODCOD mg/lmg/l 349.9349.9

ColorColor SUSU 66.0666.06

TKNTKN mg / l as NHmg / l as NH33 10.3510.35

ECEC µµS / cmS / cm 14321432

pHpH -- 10.210.2

SSSS mg/lmg/l 44.544.5

Schematic diagram in Membrane bioreactorSchematic diagram in Membrane bioreactor

MBR

P EFFLUENT

SLUDGE DRAIN

Air Compressor

INFLUENT

Membrane backwashingMembrane backwashing

Membrane

INVESTIGATION CONDITIONINVESTIGATION CONDITION

Compare: Compare: 1. SLUDGE AGE 20 DAYS1. SLUDGE AGE 20 DAYS♦♦

2. SLUDGE AGE 30 DAYS2. SLUDGE AGE 30 DAYS

♦♦

3. SLUDGE AGE 60 DAYS3. SLUDGE AGE 60 DAYS

Compare Continuous aeration modeCompare Continuous aeration modeand intermittent aeration mode at 30/30, and intermittent aeration mode at 30/30, 45/45, 60/60 minutes45/45, 60/60 minutesDO in aeration tank is maintained higher DO in aeration tank is maintained higher

than 4.0 mg/l during aeration periodthan 4.0 mg/l during aeration period

Line Chart of Influent and Effluent COD

-50.00

100.00150.00200.00250.00300.00350.00400.00450.00500.00

30/1/2007

2/2/2007

5/2/2007

8/2/2007

11/2/2007

14/2/2007

17/2/2007

20/2/2007

23/2/2007

Date

COD(

mg/

l)

Inf COD Eff COD


-

100.00

200.00

300.00

400.00

500.00

600.00

700.00

800.00

900.00

1/4/07 1/7/07 1/10/07 1/13/07 1/16/07 1/19/07 1/22/07 1/25/07

Date

COD

(mg/

l)

Inf COD Eff COD


-50.00

100.00150.00200.00250.00300.00350.00400.00450.00500.00

25/1/2007

28/1/20

0731/1

/2007

3/2/20

07

6/2/200

7

9/2/2007

12/2/2007

15/2/2007

18/2/2007

21/2/

2007

Date

COD(

mg/

l)

Inf COD Eff COD

PERFORMANCE OF PERFORMANCE OF MBR MBR

FOR COD REMOVALFOR COD REMOVAL

SRT 20 d.SRT 20 d.

SRT 30 d.SRT 30 d.

SRT 60 d.SRT 60 d.

Line Chart of Influent and Effluent TKN

-

5.00

10.00

15.00

20.00

25.00

30.00

35.00

1/4/07 1/7/07 1/10/07 1/13/07 1/16/07 1/19/07 1/22/07 1/25/07

Date

TKN

(mg/

l as

NH3

)

Inf TKN Eff TKN

Line Chart of Influent and Effluent TKN

-

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

30/1/2007 2/2/2007 5/2/2007 8/2/2007 11/2/2007 14/2/2007 17/2/2007 20/2/2007 23/2/2007

Date

TKN

(mg/

l as

NH3

)

Inf TKN Eff TKNLine Chart of Influent and Effluent TKN

-

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

25/1/2007

28/1/2007

31/1/2007

3/2/2007

6/2/2007

9/2/2007

12/2/2007

15/2/2007

18/2/2007

21/2/2007

Date

TKN(

mg/

l as

NH3

)

Inf TKN Eff TKN

Performance of Performance of MBR forMBR for

TKN RemovalTKN Removal

SRT 20 d.SRT 20 d.

SRT 30 d.SRT 30 d.

SRT 60 d.SRT 60 d.

Line Chart of Influent and Effluent Phosphorus

-

0.50

1.00

1.50

2.00

2.50

30/1/

2007

2/2/20

07

5/2/20

07

8/2/20

07

11/2/

2007

14/2/

2007

17/2/

2007

20/2/

2007

23/2/

2007

Date

Phos

phor

us(m

g/l a

s P)

Inf Phosphorus Eff Phosphorus


-0.200.400.600.801.001.201.401.601.802.00

25/1/

2007

28/1/

2007

31/1/

2007

3/2/20

07

6/2/20

07

9/2/20

0712

/2/20

0715

/2/20

0718

/2/20

0721

/2/20

07

Date

Phos

phor

us(m

g/l a

s P)



-

0.50

1.00

1.50

2.00

2.50

1/4/07 1/7/07 1/10/07 1/13/07 1/16/07 1/19/07 1/22/07 1/25/07

Date

Phos

phor

us(m

g/l a

s P)


Performance of Performance of MBR for MBR for

Phosphorus RemovalPhosphorus Removal

SRT 20 d.SRT 20 d.

SRT 30 d.SRT 30 d.

SRT 60 d.SRT 60 d.

Color Removal Color Removal

Before After

Line Chart of SVI and MLVSS/MLSS

0.00

20.00

40.00

60.00

80.00

100.00

120.00

140.00

30/1/

2007

1/2/20

073/2

/2007

6/2/20

079/2

/2007

13/2/

2007

15/2/

2007

19/2/

2007

21/2/

2007

23/2/

2007

date

SVI (

ml/g

)

0.000.100.200.300.400.500.600.700.800.90

MLV

SS/M

LSS

SVI(ml/g) MLVSS/MLSS


-

50.00

100.00

150.00

200.00

250.00

1/4/07

1/5/07

1/6/07

1/8/07

1/10/0

71/1

2/07

1/15/0

71/1

7/07

1/19/0

71/2

2/07

1/25/0

71/2

7/07

date

SVI (

ml/g

)

0.520.540.560.580.600.620.640.660.680.700.72

MLV

SS

/MLS

S



0.00

50.00

100.00

150.00

200.00

250.00

300.00

25/1/

2007

27/1/

2007

1/2/20

073/2

/2007

6/2/20

079/2

/2007

13/2/

2007

15/2/

2007

19/2/

2007

21/2/

2007

date

SVI (

ml/g

)

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70M

LVSS

/MLS

S


SVI and MLSS/MLVSS SVI and MLSS/MLVSS inside MBR systeminside MBR system

SRT 20 d.SRT 20 d.

SRT 30 d.SRT 30 d. SRT 60 d.SRT 60 d.

Line Chart of Influent and Effluent SS

-

50.00

100.00

150.00

200.00

250.00

300.00

30/1/

2007

2/2/20

07

5/2/20

07

8/2/20

07

11/2/

2007

14/2/

2007

17/2/

2007

20/2/

2007

23/2/

2007

Date

SS

(mg/

l)

Inf SS Eff SS


-

100.00

200.00

300.00

400.00

500.00

600.00

1/4/07 1/7/07 1/10/07 1/13/07 1/16/07 1/19/07 1/22/07 1/25/07

Date

SS (m

g/l)

Inf SS Eff SS


-

50.00

100.00

150.00

200.00

250.00

300.00

25/1/

2007

28/1/

2007

31/1/

2007

3/2/20

07

6/2/20

07

9/2/20

0712

/2/20

0715

/2/20

0718

/2/20

0721

/2/20

07

Date

SS (m

g/l)

Inf SS Eff SS

Performance Performance of MBR for of MBR for

SS RemovalSS Removal

SRT 20 d.SRT 20 d.

SRT 30 d.SRT 30 d.

SRT 60 d.SRT 60 d.

Effect of sludge age on removal percentage of textile wastewater treatment using SMBR

SRT(days)

COD(%)

BOD(%)

TKN(%)

NH4(%)

TP(%)

Color(%)

20 84.6 91.0 92.8 91.9 91.1 74.4

30 85.6 94.5 93.0 97.6 91.6 86.8

45 85.0 93.5 93.5 90.4 94.1 65.0

60 87.3 94.9 93.1 94.2 95.5 85.1

Effect of Intermittent aeration time on removal percentage of SMBR for textile wastewater

Intermittent time (mins)

COD(%)

BOD(%)

TKN(%)

NH4(%)

TP(%)

Color(%)

30/30 83.1 97.1 91.0 93.6 92.1 81.6

60/60 83.7 98.5 95.9 93.3 95.0 81.6

90/90 88.7 98.2 88.5 85.0 91.0 71.1

Continu ous aeration

85.6 94.5 90.0 97.6 91.6 87.0

♦

MBR system with sludge age 60 days and intermittent aeration mode at 30/30 minutes was selected here for the system with less sludge wastage and high performance of wastewater treatment

♦

MBR system has better performance than the traditional AS system, used in this factory.

♦ Better effluent quality could be obtained with space saving MBR unit.

ConclusionConclusion

Case study 2: Decolorization of with nanofiltration system

♦

Decolourisation of dyeing wastewater with NF system

WASTE

COLOURS

DYING PROCESS

RINSING PROCESS

WATER

NANOFILTRATION MODULES

FILLING

WASTEWATER

DECOLOURED WASTE

Decolorization with NF system

Influent Permeate Concentrate

Advantage of MBR Technology# Minimum space required for plant# Modular assembly (easy to upgrade for higher capacity)

# Increasing of micro-organism concentration possible, specialised and well adapted micro-organisms help to degrade problematic pollutants

# Water for reuse (irrigation, rinsing water etc.)= > better retention of micro-organisms= > saving costs for freshwater= > saving water resources (protecting the environment)

# Maximum health protection (closed system)# No smell # Possible same running costs compared to conventional

technologies

wastewater treatment and reuse by submerged membrane ...flat sheet mf membrane with pore size of 0.4...

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