Analysis of methods for determining nitrogen oxide emission from processing systems of animal by-products

Existing methods for calculating nitrous oxide (N₂O) emissions from animal by-products processing systems (manure and manure) use emission factors depending on the technologies used and climatic conditions. The calculation based on Methodological Recommendations for conducting a voluntary inventory of greenhouse gas emissions in the constituent entities of the Russian Federation is consolidated. It is performed on three methodological levels. The 1st is applied using the default N₂O emission factors. A more detailed level 1 method takes into account the average annual nitrogen excretion. In the level 2 method, calculations are made taking into account the feeding ration and data on the average annual nitrogen excretion. Each method results in a large range of calculated values of N₂O emission. A more specific calculation is offered by the methodology developed within the framework of the international project «Manure Standards». The purpose of the work is to calculate N₂O emissions using the example of a cattle complex (hereinafter referred to as cattle) in the Leningrad Region using the specified methods to determine emission factors that require clarification.

Studies have established that the N₂O emission calculated according to the methodology of the «Manure Standards» project is 336 kg/year. N₂O emissions calculated according to the Methodological Recommendations range from 182.04 to 1604.6 kg/year, depending on the values of the emission factors.

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