CIG Air Monitoring Projectdnr.wi.gov/topic/AirQuality/documents/bmp/File3.pdf · CIG Air Monitoring...
Transcript of CIG Air Monitoring Projectdnr.wi.gov/topic/AirQuality/documents/bmp/File3.pdf · CIG Air Monitoring...
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CIG Air Monitoring ProjectOctober 2006 – June 2009
Presented to theAgricultural Waste Air Emissions
Advisory GroupApril 7, 2010
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Air Toxics rule regulates hydrogen sulfide (H2S) and ammonia (NH3) at the
property boundary
NR Board delayed implementation of Air Toxics rule for agricultural sources
until July 2011
Approach for rule to be based on BMPs
Background Air Issues
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CIG Air Monitoring Project Design
Study examined concentrations of H2S and NH3 on and near waste lagoons, before and
after installing BMPs
Study did not examine property boundaries
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CIG Air Monitoring ProjectDesign Limitations
Large complex multiple open sourcesHighly variable conditions
Farms always changingLimited sampling trips and locations
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CIG Air Monitoring ProjectResults of Design Limitations
• MAY NOT be representative of typical conditions – small sample size
• Can NOT be DIRECTLY compared to NR445
• Can NOT be used to determine emission factors or overall emissions
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CIG Air Monitoring Project
Our Data Does Provide:
• pre and post practice comparisons
• inter-farm comparisons
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CIG Air Monitoring ProjectLagoon Surface Results
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Lagoon Surface NH3
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reDun
n Pos
tMW
LOW
MW U
PMC U
P Pre
MC Up P
ost
MC Low P
reMC Lo
w Pos
t
KC Pre
KC Pos
tDIGESTORS
ImpermeableCover
UNDIGESTED MANURES
PermeableCover
Solids Separation And Aeration
Ug/
m3
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CIG Air Monitoring ProjectLagoon Surface Results
NH3 Concentrations:
Digested manure > undigested manure
Impermeable cover << no cover
Permeable cover = no cover
Aeration > no aeration
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Lagoon Surface H2S
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MC Up P
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MC Low P
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w Pos
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tDIGESTORS
ImpermeableCover
UNDIGESTED MANURES
PermeableCover
Solids Separation And Aeration
Ug/
m3
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CIG Air Monitoring ProjectLagoon Surface Results
H2S Concentrations :
Digested manure = undigested manure
Impermeable cover << no cover
Permeable cover < no cover
Aeration < no aeration
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CIG Air Monitoring Project
Ambient Sampling
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Near Lagoon Ambient NH3
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p
MC Up P
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tMC Lo
w Pre
MC Low P
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KC Pos
t
Digestors Undigested Manuresimpermeable
coversolids separation
and aerationpermeable
cover
NR 445 418 ug/m3
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CIG Air Monitoring ProjectNear Lagoon Results
NH3 Concentrations:
Digested manure > undigested manure
Impermeable cover << no cover
Permeable cover < no cover
Aeration > no aeration
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Near Lagoon Ambient H2S
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p Pos
tMC Lo
w Pre
MC Low P
ost
KC Pre
KC Pos
tDigestors Undigested Manures
impermeablecover
solids separationand aeration
permeablecover
NR 445 335 ug/m3
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CIG Air Monitoring ProjectNear Lagoon Results
H2S Concentrations:
Digested manure = undigested manure
Impermeable cover somewhat < no cover
Permeable cover somewhat < no cover
Aeration locally > no aeration
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CIG Air Monitoring ProjectConclusions
• Impermeable cover WILL significantly reduce NH3 and H2S near and on lagoons
• Semi-permeable cover reduces lagoon surface H2S concentrations but not NH3
• Semi-permeable cover reduces near lagoon concentrations of both gases
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CIG Air Monitoring ProjectConclusions
• Anaerobic digestion has no apparent effect on H2S, but raises both near lagoon and lagoon surface NH3
• Aeration MAY reduce LAGOON SURFACE H2S concentrations, however it appears to RAISE Lagoon Surface NH3 and near-by H2S and NH3 concentrations
• Almost all Near Lagoon H2S Concentrations are LESS than Air Toxics Rule for Property Lines
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• Anaerobic digestion has no apparent effect on H2S, but raises both near lagoon and lagoon surface NH3
• Aeration MAY reduce LAGOON SURFACE H2S concentrations, however it appears to RAISE Lagoon
Surface NH3 and near-by H2S and NH3 concentrations
• Almost all Near Lagoon H2S Concentrations are LESS than Ar Toxics Rule for Property LinesBUT…
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CIG Air Monitoring ProjectConclusions
• Agitated areas (sand channels and outfalls) behave as a point source for H2S
• Local concentrations may exceed recommended occupational exposure levels
• Very discrete concentrated plumes may develop. Downwind magnitude and effect of these plumes unknown
• Inversions may cause widespread local exceedences of occupational exposure limits. Extent unknown.
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Effect of Outfall on Near Lagoon Ambient Concentrations
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MW Low MW Up MWOutfall
MW Low MW Up MW Out
Hydrogen Sulfide Ammonia
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Sand Channel Observations
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Ammonia Hydrogen SulfideOSHA H2S Exposure Limit
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Project Completion
• Complete Final Report Available at: http://www.datcp.state.wi.us/arm/agriculture/land-water/odor/index.jsp
• Department considers CIG results to indicate a fencelinestudy is needed to better understand ag waste emissions
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Agricultural Waste Emissions Fenceline Study
DNR intends to monitor property line concentrations of NH3 and H2S in 2010
Ideally, 5 or 6 farms: 2 or 3 dairies, beef, poultryand swine
A combination of passive and active sampling methods
Currently evaluating volunteer farms