Post on 11-Jun-2020
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: dr_chawalit@yahoo.com
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
Line Chart of Influent and Effluent 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
Line Chart of Influent and Effluent 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
Line Chart of Influent and Effluent 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)
Inf Phosphorus Eff Phosphorus
Line Chart of Influent and Effluent Phosphorus
-
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)
Inf Phosphorus Eff Phosphorus
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
Line Chart of SVI and 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
SVI(ml/g) MLVSS/MLSS
Line Chart of SVI and MLVSS/MLSS
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(ml/g) MLVSS/MLSS
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
Line Chart of Influent and Effluent 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
Line Chart of Influent and Effluent 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