biomethanation of cattle dung - global methane initiative · ‘best green plant in asia’ award...
TRANSCRIPT
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IIT Roorkee 1IIT Roorkee
Power GenerationBased on
Biomethanation of Cattle Dung
by
Surendra Kumar
Indian Institute of Technology Roorkee
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IIT Roorkee 2
INTRODUCTION
• HAEBOWAL DAIRY COMPLEX
• WTE PLANT
• POSSIBILITY OF TRANSFERRING GENERATED POWER TO GRID
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IIT Roorkee 3
HAEBOWAL WTE PLANT
• 235 TPD of Cattle Dung
• 10,000 m3/day Biogas
• Biogas Used to Generate Electricity (1MW)
• Approx. 15% of Power Used in Plant, Rest
Exported to Grid
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IIT Roorkee 4
Haebowal Plant Contd.
• 35-40 TPD Biofertilizer
• Treated Water Recycled / Used for Irrigation
• Plant Fully Automated and SCADA Controlled
• ‘Best Green Plant in Asia’ Award of Asian
Power Awards 2007
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IIT Roorkee 5IIT Roorkee
SECTIONS IN WTE PLANT• Feed Preparation
• Biomethanation
• Power Generation and Distribution
• Effluent Treatment and Biofertilizer
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IIT Roorkee 6IIT Roorkee
FEED PREPARATION SECTION• Collection of Cattle Dung
• Mixing with Water
• Size Reduction of Solids
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IIT Roorkee 7IIT Roorkee
• Anaerobic Digesters
• Biodesulphurization Unit
BIOMETHANATION SECTION
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IIT Roorkee 8
• Conversion of Organic Waste into Biogas
• Temperature: 37-39 oC
IIT Roorkee
ANAEROBIC DIGESTERS
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IIT Roorkee 9
• Removal of H2 S from Biogas
• Use of Thiothrix or Thiobacillus Aerobic
Bacteria
• Nutrients and Trace Elements Provided by
Digested Substrate
IIT Roorkee
BIODESULPHURIZATION UNIT
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IIT Roorkee 10
ANAEROBIC DIGESTER
• Patented Design of Entec, Austria
• Mixing of Substrate Through Biogas
Induced Mixing
• Conversion Efficiency : 50 – 55 %
• Biodesulphurzation Unit
• Complex Design with Sophisticated
Instrumentation and Control System
IIT Roorkee
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IIT Roorkee 11
WORKING PRINCIPLE OF ANAEROBIC DIGESTER
IIT Roorkee
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IIT Roorkee 12
PERFORMANCE ANALYSIS OF ANAEROBIC DIGESTERS
• Digesters : 2
• Working Volume : 5000 m3 (each)
• Diameter : 20 m
• Height : 20 m
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IIT Roorkee 13
6.40
6.42
6.44
6.46
6.48
6.50
6.52
6.54
0 5 10 15 20 25
Day of September 2009
% T
otal
Sol
ids
in D
iges
ter BIMA-A PORT-1 BIMA-A PORT-2BIMA-A PORT-3 BIMA-B PORT-1BIMA-B PORT-2 BIMA-B PORT-3
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IIT Roorkee 14
77.90
78.00
78.10
78.20
78.30
78.40
78.50
78.60
78.70
0 5 10 15 20 25
Day of Septemeber 2009
% V
olat
ile S
olid
s in
Tot
al S
olid
sBIMA-A PORT-1 BIMA-A PORT-2BIMA-A PORT-3 BIMA-B PORT-1BIMA-B PORT-2 BIMA-B PORT-3
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IIT Roorkee 15
7.16
7.18
7.20
7.22
7.24
7.26
7.28
7.30
7.32
7.34
0 5 10 15 20 25
Day of September 2009
pH in
Dig
este
rBIMA-A PORT-1 BIMA-A PORT-2
BIMA-A PORT-3 BIMA-B PORT-1BIMA-B PORT-2 BIMA-B PORT-3
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IIT Roorkee 16
37.80
38.30
38.80
39.30
39.80
40.30
0 5 10 15 20 25
Day of September 2009
Tem
pera
ture
of D
iges
ter (
oC)
BIMA-A PORT-1 BIMA-A PORT-2BIMA-A PORT-3 BIMA-B PORT-1BIMA-B PORT-2 BIMA-B PORT-3
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IIT Roorkee 17
ANAEROBIC DIGESTERS AND GAS HOLDER
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IIT Roorkee 18
0
50
100
150
200
250
300
350
0 5 10 15 20 25
Day of September 2009
H2S
(ppm
)
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IIT Roorkee 19
CONCLUDING REMARKS FOR ANAEROBIC DIGESTER
• Thorough Mixing Achieved
• Removal of Scum and Sediments Possible
• Conversion : Approx. 50 %
• H2 S Removal : < 300 ppm
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IIT Roorkee 20
POWER GENERATION AND DISTRIBUTION SECTION
Biogas Storage
• A Gas Holder of 1000 m3 Capacity Provided
• Synthetic Membrane (Polyester) Gas Holder
Suspended in a Concrete Silo
• Gas Holder Buffers the Differences Between
Gas Production and Gas ConsumptionIIT Roorkee
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IIT Roorkee 21
BIOGAS ENGINE
• Converts Biogas into Electricity
• Efficiency of the Gas Engine : 37%
IIT Roorkee
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IIT Roorkee 22
ELECTRICITY SUB-STATION• A Portion (Approx.15%) of Electrical
Energy Used for In-house Powe r
Requirement
• Balance Successfully Transferred to the
Grid
• A Low Tension Supply also Arranged for
Plant Power Requirement During Startup
or in Case of Break Down of Gas Engine
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IIT Roorkee 23
BIOFERTILIZER AND EFFLUENT TREATMENT SECTION
IIT Roorkee
BIOFERTILIZER
• The Digested Substrate Dewatered in Screw
Presses
• Sufficient Area Provided to Dry the
Dewatered Solid Residue
• Solid Residue Almost Free of Odour and
Contains Nutrients
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IIT Roorkee 24IIT Roorkee
• BOD/COD Concentration of Press Water
Quite High and can not be Discharged
Directly
• Treated in an ETP by Using Activated
Sludge Process
EFFLUENT TREATMENT PLANT
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IIT Roorkee 25
Process Flow Sheet Haebowal WTE Plant
IIT Roorkee
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IIT Roorkee 26
SUGGESTED MODIFICATIONSAddition of One More Feed Mixing Tank
• Required to Check the Flow of Silt / Sand,
Syringes etc.
Biogas Engine
• Two Biogas Engines, Each of 0.5 MW
Capacity instead of One Engine of 1 MW
IIT Roorkee
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IIT Roorkee 27
CONCLUDING REMARKS• Power Generation Based on Biomethanation
of Cattle Waste is Possible at Large Scale
• Successful Transfer of Generated Power to
the Grid
• Technology and Design of Such Projects are
Indigenously Available
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IIT Roorkee 28
THANKS