Grain elevators

Download the grain elevator calculator to help you estimate the releases of the National Pollutant Release Inventory (NPRI) substances.

Grain elevator operations release criteria air contaminants (Part 4 substances). The calculator focusses on releases to air and uses default emission factors. It can be adapted to use available site-specific emission factors. If you want to use a site-specific emission factor, enter it in the emission factor column, but be sure to convert the units correctly. 

The spreadsheet calculators use emission factors based on uncontrolled emission sources. If you use an emission control device and the default emission factor is uncontrolled, use this formula to adjust the spreadsheet calculation:

Controlled emissions = uncontrolled emissions x ((100 - control efficiency)/100)

Since NPRI reporting thresholds are for the facility as a whole, you may need to combine the air releases you calculate with releases from other sources at your facility.

The following sections explain how the spreadsheet calculator works.

Suggested estimation methodology: emission factor

The general equation for estimation using an emission factor is:

E = A x EF

where:

  • E = emissions
  • A = activity rate
  • EF = emission factor

Input data

The activity rate (A) is the number of tonnes of grain processed. There are individual emission factors for total particulate matter (TPM), particulate matter with a diameter less than or equal to 10 micrometres (µm) (PM10) and particulate matter with a diameter less than or equal to 2.5 micrometres (PM2.5) for each of the grain elevator processes. The total emissions for each substance will be the sum of the emissions from each process.

Substance releases

Releases for Part 4 substances

Total particulate matter (TPM)Footnote *
Process Emission factor (EF)Footnote 1 EF units
Grain drying - column dryer 0.11 kilograms (kg)/tonne
Grain drying - rack dryer 1.5 kg/tonne
Grain drying - rack dryer (self-cleaning screens (< 50 mesh)) 0.235 kg/tonne
Headhouse and internal handling (legs, belts, distributors, scale, etc.) 0.0305 kg/tonne
Grain cleaning - internal vibrating (single cyclone only) Footnote **   0.0375 kg/tonne
Unloading (receiving) from straight trucks 0.09 kg/tonne
Unloading (receiving) from hopper trucks 0.0175 kg/tonne
Unloading (receiving) from railcars 0.016 kg/tonne
Unloading (receiving) from ships 0.075 kg/tonne
Unloading (receiving) from barges - continuous barge unloader 0.0145 kg/tonne
Unloading (receiving) from barges - marine leg 0.075 kg/tonne
Loading (shipping) into ships 0.024 kg/tonne
Loading (shipping) into barges 0.008 kg/tonne
Loading (shipping) into trucks (unspecified type) 0.043 kg/tonne
Loading (shipping) into railcars 0.0135 kg/tonne
Storage bin vents 0.0125 kg/tonne

 

Particulate matter less than or equal to 10 µm (PM 10)Footnote *
Process Emission factor (EF)Footnote 1 EF units
Grain drying - column dryer 0.0275 kg/tonne
Grain drying - rack dryer 0.375 kg/tonne
Grain drying - rack dryer (self-cleaning screens (< 50 mesh)) 0.06 kg/tonne
Headhouse and internal handling (legs, belts, distributors, scale, etc.) 0.017 kg/tonne
Grain cleaning - internal vibrating (single cyclone only)Footnote ** 0.0095 kg/tonne
Unloading (receiving) from straight trucks 0.0295 kg/tonne
Unloading (receiving) from hopper trucks 0.0039 kg/tonne
Unloading (receiving) from railcars 0.0039 kg/tonne
Unloading (receiving) from ships 0.019 kg/tonne
Unloading (receiving) from barges - continuous barge unloader 0.00365 kg/tonne
Unloading (receiving) from barges - marine leg 0.019 kg/tonne
Loading (shipping) into ships 0.006 kg/tonne
Loading (shipping) into barges 0.002 kg/tonne
Loading (shipping) into trucks (unspecified type) 0.0145 kg/tonne
Loading (shipping) into railcars 0.0011 kg/tonne
Storage bin vents 0.00315 kg/tonne

 

Particulate matter less than or equal to 2.5 µm (PM 2.5)Footnote *
Process Emission factor (EF)Footnote 1 EF units
Grain drying - column dryer 0.0047 kg/tonne
Grain drying - rack dryer 0.065 kg/tonne
Grain drying - rack dryer (self-cleaning screens (< 50 mesh)) 0.01 kg/tonne
Headhouse and internal handling (legs, belts, distributors, scale, etc.) 0.0029 kg/tonne
Grain cleaning - internal vibrating (single cyclone only)Footnote ** 0.0016 kg/tonne
Unloading (receiving) from straight trucks 0.005 kg/tonne
Unloading (receiving) from hopper trucks 0.00065 kg/tonne
Unloading (receiving) from railcars 0.00065 kg/tonne
Unloading (receiving) from ships 0.0025 kg/tonne
Unloading (receiving) from barges - continuous barge unloader 0.00095 kg/tonne
Unloading (receiving) from barges - marine leg 0.0025 kg/tonne
Loading (shipping) into ships 0.0011 kg/tonne
Loading (shipping) into barges 0.000275 kg/tonne
Loading (shipping) into trucks (unspecified type) 0.00245 kg/tonne
Loading (shipping) into railcars 0.000185 kg/tonne
Storage bin vents 0.00055 kg/tonne
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