Albert J. Heber, Associate Professor Director, Purdue Agricultural Air Quality Lab
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Transcript of Albert J. Heber, Associate Professor Director, Purdue Agricultural Air Quality Lab
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Albert J. Heber, Associate ProfessorDirector, Purdue Agricultural Air Quality Lab
Agricultural and Biological Engineering
Purdue University
Building EnvironmentResearch & Education
AgAirQuality.com
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“A Buoyant Convective Flux Chamber for Measuring Liquid Surface Emissions”
hoodsunny
A.J. Heber, T.T. Lim, J.Q. Ni and K.J. Fakhoury
AgAirQuality.com
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Objectives Develop floating emission chamber Evaluate performance
Field Tests
Lab Tests
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Air Supply Unit
Blower Adsorbent
Filter
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Air Supply Blower
198 m3/h
(117 cfm)
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Air Supply Unit
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Air Supply Filter
22.4 kg of adsorbent Charcoal Permanganate Zeolite
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Top View
Air outlet
Sampling location
Air velocity probe
Stainless steel
divider
Air inlet
Styrofoam boards for buoyancy
Liquid surface area = 0.76 m2
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BCFC Inlet
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Stainless Steel Lining
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“Hairpin” Airflow Path
2.4 m path length
2.2 sec residence
time
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1.1 m/sSampling location
Air velocity probe
Air outlet
Side View
Air inlet
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End View
Air Inlet
Air Outlet
Divider31 cm
Samplingpoint
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Lab Tests
N-butanol at 250-20,250 ppm in 200 L water
Odor emission only.Lagoon effluent: 100, 50 and 25% dilution
H2S, NH3, CO2 and odor emission.
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Gas Analyzers Ammonia (0 to 200 ppm)
• Ammonia converted to nitric oxide with a SS converter, 875 C
• Chemiluminescense: PMT detects light emission from reaction of nitric oxide with ozone.
• Sample flow rate = 0.5 Lpm Hydrogen sulfide (0 to 10,000 ppb)
• Hydrogen sulfide converted to sulfur dioxide, SO2
• Pulsed fluorescence: PMT detects UV from decaying SO2 molecules
• Sample flow rate = 1.0 Lpm Carbon dioxide (0 to 5,000 ppm)
• Photoacoustic infrared sensor • Sample flow rate = 1.0 Lpm.
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Instrumentation Room
Manifolds
PC
Gas sensors
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Odor Threshold Measurement
1 of 8 panelists
Olfactometer
Tedlar bag
Panel leader’s hand
PC
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N-Butanol Test Results
Blank: 9 OU Inlet mean: 10.4 OU (8 to 13 OU) Odor emission: 0.5 to 11.2 OU/s-m2
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Emission Rate of N-Butanol
Emission Rate = 5.10 Log(C) - 13.05
R2 = 0.82
0
4
8
12
100 1000 10000 100000Concentration of N-butanol in Tank, ppm
Em
issi
on R
ate,
OU
/s-m
2
2027
5163
155
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Lagoon Effluent Test Results
Inlet mean: 22 OU Outlet mean: 27 OU Odor emission: 0.8 OU/s-m2 at 100% Hydrogen sulfide too low to measure Inlet ammonia mean: 1.8 ppm Outlet ammonia mean: 2.9 ppm Ammonia emission proportional to
effluent concentration. Ammonia levels below odor threshold
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Lagoon Effluent: NH3 Emission
Emission Rate = 4.15x - 18.1
R2 = 0.90
0
100
200
300
400
0 20 40 60 80 100 120Lagoon Effluent Dilution, %
Em
issi
on R
ate,
mg/
hr-
m2
Solids: 0.16%
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Field Tests
Swine grow-finish facility Four consecutive days Day 1: Effect of air speed
crustincorner
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Anaerobic Treatment Lagoons
2nd Stage Basin
1st Stage Basin
Six Swine Buildings
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Deployment
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Odor Emission Tests
hoodwtwovacs
3 Lpm
pumpsAir
velocity control
Hammer
Evacuation chamber
Raceway(6 m)
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Chamber Inlet and Outlet Samples
hebervacus
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Emission vs. Air Speed
Emission = 1.85 x 0.93
R2 = 0.88
0
1
2
3
4
0.0 0.5 1.0 1.5 2.0
Surface Air Speed, m/s
Measured Predicted
Emission, OU/m2-s
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Field Test Results
Inlet mean: 23 OU (12 to 42 OU) Outlet mean: 52 OU Odor emission: 1.5 to 2.1 OU/s-m2
Mean of 1.7 OU/s-m2 corresponded to 1,000 ppm n-butanol.
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Advantages
Large air filtration and cleaning unit Inlet air sampling Large liquid surface area Long air path
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Disadvantages
Size (van or pickup required) Weight (2-4 people required) Gentle berm slopes required, >3:1 Limited reach (five meters)
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Future Research
Reduce size and weight Evaluate and improve internal air profiles Study effect of flow rate on emission
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Conclusions
Good comparative measurements of gas and odor emission rates
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Conclusions
Low sampling variance
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Conclusions
Lower detection limit: 500-1000 ppm n-butanol.
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ConclusionsLower limit reached with
properly designed swine lagoon
0.16% solids
“Low odor” lagoon
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Conclusions
hood5-7
Odor emission rate increased for 1000-20,000 ppm n-butanol
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Acknowledgements
Purdue University Agricultural Research Program
State of Indiana Value Added Research Program Ramco Sales, Inc.
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Questions?
float2
Check out AgAirQuality.com