high rate thermophilic anaerobic membrane bioreactor for wastewater treatment by kaushalya c....
TRANSCRIPT
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High Rate Thermophilic Anaerobic Membrane
Bioreactor for Wastewater Treatment
by
Kaushalya C. WijekoonMaster Student (st107821)
EEM/SERD
Wastewater Ξ Biogas Ξ Green
Energy
1/22
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Content
Study Background
Aerobic Wastewater Treatment
Anaerobic Wastewater Treatment
Anaerobic Membrane Bioreactor
Potential Application Areas
Achievements of the Study
Conclusions
2/22
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Wastewater Treatment Options
3/22
Aerobic Biodegradation
Biomass
Organic Matters + O2 + CO2 + H2O
Anaerobic Biodegradation
Organic Matters + CO2 + H2O
Biomass
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Aerobic Process: High Energy Demand
Sludge Treatment
50 % of Wastewater Treatment Plant’s
Energy Requirement
3/22
30 - 40 % of Wastewater Treatment
Plant’s Energy Requirement
Aeration Tank
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Anaerobic Process
Why Anaerobic Process
Lessnutrient removal
Low biomass production
Low energy requirement
Energy recovery through biogas
Low sludge production
Opportunity for nutrient recovery
Low Cost & Less Energy
Requirement
5/22
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Why Thermophilic Anaerobic Process
Increased Microbial activity
Promote higher loading rates,
Higher Biogas Production
Effluent disinfection :
Promote Wastewater Reuse
6/22
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Thermophilic Anaerobic Process: Problems Encounter
Biomass retention is crucial
Membrane Bioreactor
7/20
Restrained thermophilic
application of high rate
anaerobic wastewater treatment
Dispersed sludge production
Increased biomass washout
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100 % Biomass Retention
Ideal Solution to Biomass Washout
Anaerobic Membrane Bioreactor (AnMBR)
Recirculation Pump
Treated water
Feed
Biogas
Membrane ModuleConcentrate
Biomass Waste
8/20
Membrane
Membrane Filtration : Biomass & Treated
Wastewater Separation
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Why Two Stage Anaerobic Membrane Bioreactor ?
PermeateBiogas
Methanogenic Reactor
MembraneModule
Concentrate Recirculation
Feed
Biogas
Hydrolytic Reactor
9/22
Advantages : Easy to Control Optimum Conditions of Both Reactors Increased Biogas Production Increased Process Stability Higher Organic Loading Higher Organic Matter Removal Efficiency
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Potential Applications of Thermophilic Anaerobic Membrane Bioreactor Palm Oil Industry Wastewater Pulp and Paper Industry Food Processing Industry Sea Food Industry Tanneries Sugar Manufacturing Textile Industry
10/22
Hot wastewater from
Industries
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Palm Oil
Palm Oil Processing Flow Chart
FFBTransportation of FFBSterilization
Cooking (Digestion and Pressing)
Clarifier
All Wastewater Streams are at High Temperature
Treshing
EFB
Wastewater
11/22
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Wastewater from Plant
Palm Oil Industry Wastewater Treatment
12/22
Loss of Energy GHG Emission Inefficient Treatment Massive Land Requirement
Step-Aeration
Anaerobic Pond System
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Palm Oil Industry : Wastewater Characteristics
Parameter Value
BOD (mg/L) 16,000
COD (mg/L) 41,000
Oil & Grease (mg/L)
3,700
Total Nitrogen (mg/L)
32.9
pH 3.9
Temperature (oC) (Before cooling) 78.0
Temperature (oC)(After cooling) 40.0
Energy Loss
High Organic Loading
13/22
0 5000
Biogas Production (m3/d)
Org
anic
Lo
ad (
kg/d
)5000
Organic Load and Biogas Production
10,000 15,000 20,000 25,000 30,000
10,000
25,000
20,000
15,000
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Palm Oil Processing : Energy Recovery from Anaerobic Membrane bioreactor
Sterilization
Digestion and Pressing
Treshing
EFB
Wastewater
Biogas
Anaerobic Membrane Bioreactor 14/22
Energy Back to the Plant
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Suction Pump
Retentate recirculation
Methanogenic Reactor
Hydralitic Reactor
Feed Tank
Membrane
Biogas
U tube
Biogas Bag
Level Controller
SV1
SV2
Time Controller
P
Water Bath
Temperature Controller
Biogas Bag
Biogas
Experimental Setup : Two Stage AnMBR
Treated Water
15/22
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Retentate recirculation
Methanogenic Reactor
Hydralitic Reactor
Feed Tank
Membrane
Biogas
U tube
Biogas Bag
SV2
Time Controller
Biogas Bag
Biogas
Experimental Setup : Two Stage Anaerobic Membrane
Bioreactor
16/22
BiogasBiogas BiogasBiogas
Treated Water
Biogas
Gravity flow to the
membrane
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Ceramic Microfilter membrane with 0.1 µm
nominal pore size Membrane Operation in
Partial Sedimentation
Mode
Membrane : Mode of Operation
17/22
Gravity Flow to Membrane
Low Energy Requirement
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Experimental Setup
18/22
Hydrolytic Rector Methanogenic
Rector
External Membrane
Two Stage Thermophilic Anaerobic Membrane Bioreactor
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Organic Matter Removal Efficiency
Higher Removal Efficiency
Can Treat high concentration wastewater effectively :
(used wastewater concentration = 10,000- 24,000 mg/L)
Have the Potential to work in high loading rates. 19/22
Major Achievement s
50
60
70
80
90
100
Organic Loading Rate (kg COD / m3.d)
Org
anic
Mat
ter
Rem
oval
E
ffic
ien
cy (
%)
5 8 12
Almost all Organics Removed
Organic Matter Removal : 96 %
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Biogas Generation & Methane Composition
Methane Composition = 60 % : similar or higher than other reactors
High Gas Production = 5 times of reactor volume : Very Good
20/22
Days
Biog
as C
ompo
sitio
n (%
)
Biog
as G
ener
ation
(L/d
)
0
5
10
15
20
25
30
35
1 11 21 31 41 51 61 71 81 91 101 111 121 131
Days
Bio
gas
Gen
erat
ion
(L
/d)
0
20
40
60
80
Biogas Generation Rate CH4 %
60 % of Methane
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Methane Yield of Two Stage AnMBR
High Methane yield Good Performances over Single Stage/ mesophilic Anaerobic
Membrane Bioreactors and over other Anaerobic Reactors
21/22
0.0
0.1
0.2
0.3
0.4
0.5
1 11 21 31 41 51 61 71 81 91 101 111 121 131
Days
Met
han
e Y
eild
(m
3 CH
4 / k
g C
OD
rem
oved
.d)
Methane Yield = 0.3 – 0.4 m3 CH4/kg COD removed .d
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Conclusions
22/22
High Temperature & High Concentration
Wastewater
Two Stage Anaerobic Membrane Bioreactor
Efficient removal of Organic Matter
Energy Generation : Green Energy( 1.5 kWh/m3)
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Thank You for Your Attention
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Conclusion
Two Stage AnMBR
Energy Requirement
0.9 kWh/m3
Energy Generation
1.5 kWh/m3
A Net Energy Generation
22/22
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Organic Matters (Carbohydrate, Protein, Fats)
Simple Organic Matters(Glucose, Amino Acid, etc)
Hydrolysis
Volatile Fatty Acids(Acetic, Butyric, Propionic)
Acidogenesis
H2 , CO2 Acetate
CH4 + CO2
Anaerobic wastewater Treatment Process
Methanogenesis
Acetogenesis
2/20
Wastewater a Green Energy
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Fresh Fruit Bunch sterilization Digestion
Wastewater from the Industry
Cooling Pond
Palm Oil Industry Wastewater Generation : Outlook
11/22
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Existing Treatment Method Loss of Energy GHG Emission Inefficient Treatment Massive Land Requirement
Anaerobic Pond System
13/22
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0
2000
4000
6000
8000
1 11 21 31 41 51 61 71 81 91 101 111 121 131
Days
Tot
al V
FA
Gen
erat
ion
(m
g/L
)
4
5
6
pH
pH &Volatile Fatty Acids (VFA)
Higher Volatile Fatty Acid Generation : 3000-7000 mg/L
Higher Reactor Stability : Constant pH regardless increasing volatile
fatty acid concentration
19/22
Hydrolytic Reactor Major Achievement
Other Reactors2500 - 3000 mg/LVFA =2500 mg/L
pH = stable 5.5
VFA =4700 mg/L
VFA =7000 mg/L