Feed manufacturing

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

Animal feed production releases criteria air contaminants (CAC). The calculator focusses on releases to air and uses default emission factors. It can be adapted to use site-specific emission factors if they are available. 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 received or 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 (PM_2.5) for each of the processes. The total emissions for each substance will be the sum of the each of the emissions for each process.

Substance releases

Total particulate matter (TPM)^{Footnote *}
Process	Emission factor (EF)^{Footnote 1}	EF units
Grain receiving	0.0085	kilograms (kg)/tonnes of grain processed
Shipping	0.00165	kg/tonnes of grain processed
Handling	0.0305	kg/tonnes of grain processed
Grain cleaning (single cyclone)^{Footnote **}	0.0375	kg/tonnes of grain processed
Pellet cooler (single cyclone)^{Footnote **}	0.18	kg/tonnes of grain processed
Grain milling: hammermill (single cyclone)^{Footnote **}	0.0335	kg/tonnes of grain processed
Grain milling: flaker (single cyclone)^{Footnote **}	0.075	kg/tonnes of grain processed
Grain milling: grain cracker (single cyclone)^{Footnote **}	0.012	kg/tonnes of grain processed

Particulate matter less than or equal to 10 µm (PM₁₀)^{Footnote *}
Process	Emission factor (EF)^{Footnote 1}	EF units
Grain receiving	0.00125	kg/tonnes of grain processed
Shipping	0.0004	kg/tonnes of grain processed
Handling	0.017	kg/tonnes of grain processed
Grain cleaning (single cyclone)^{Footnote **}	0.0095	kg/tonnes of grain processed
Pellet cooler (single cyclone)^{Footnote **}	0.09	kg/tonnes of grain processed
Grain milling: hammermill (single cyclone)^{Footnote **}	0.017	kg/tonnes of grain processed
Grain milling: flaker (single cyclone)^{Footnote **}	0.0375	kg/tonnes of grain processed
Grain milling: grain cracker (single cyclone)^{Footnote **}	0.006	kg/tonnes of grain processed

Particulate matter less than or equal to 10 µm (PM _2.5)^{Footnote *}
Process	Emission factor (EF)^{Footnote 1}	EF units
Grain receiving	0.0002^{Footnote ***}	kg/tonnes of grain processed
Shipping	0.0001^{Footnote ***}	kg/tonnes of grain processed
Handling	0.0029	kg/tonnes of grain processed
Grain cleaning (single cyclone)^{Footnote **}	0.0016^{Footnote ***}	kg/tonnes of grain processed
Pellet cooler (single cyclone)^{Footnote **}	0.0153^{Footnote ***}	kg/tonnes of grain processed
Grain milling: hammermill (single cyclone)^{Footnote **}	0.0029^{Footnote ***}	kg/tonnes of grain processed
Grain milling: flaker (single cyclone)^{Footnote **}	0.0064^{Footnote ***}	kg/tonnes of grain processed
Grain milling: grain cracker (single cyclone)^{Footnote **}	0.001^{Footnote ***}	kg/tonnes of grain processed

Footnote *

This substance has no Chemical Abstracts Service Registry Number^{Footnote 2} .

Return to footnote* Referrer

Footnote **

This uses a controlled emission factor.

Return to footnote** Referrer

Footnote ***

Applied scaling factors for grain elevators; refer to AP-42, Table 9.9.1-1.

Return to footnote*** Referrer

References

Footnote 1

AP-42 Chapter 9.9.1 Grain Elevators & Processes (epa.gov)

Return to footnote1 Referrer

Footnote 2

The Chemical Abstracts Service Registry Number (CAS RN) is the property of the American Chemical Society and any use or redistribution, except as required in supporting regulatory requirements and/or for reports to the Government when the information and the reports are required by law or administrative policy, is not permitted without the prior, written permission of the American Chemical Society.

Return to footnote2 Referrer

Page details

Date modified:: 2023-03-01

Language selection

Search