The Use of Grass Fiber in Paper Industry – Calculating the Carbon Footprint of an Alternative to Virgin Fibers

Meeting the climate goals of the German government and the international community requires defossilization of all sectors of the economy, and as the source of approximately 22 % of German greenhouse gas emissions in 2018, the industrial sector has a major role to play [1]. When these emissions were examined at the level of individual industrial branches in 2016, the paper industry was revealed to be responsible for the third-largest share [2].

Creapaper GmbH has developed a method for the processing of grass fiber pellets, which can be used to replace a portion of the conventional pulp in the production of paper and potentially contribute to the decarbonization of the paper industry. The FfE has been engaged by Creapaper to analyze the impacts on energy use and greenhouse gas emissions of the use of grass fiber in the papermaking process.

Using energy consumption data provided by Creapaper, the FfE will calculate the emissions balance for each step in the production process of Creapaper’s grass fiber pellets. This will allow for the comparison of the energetic and CO2-footprints of the production of grass fiber pellets and conventional pulp. The results of previous work examining the production of conventional pulp via the sulfate process (or kraft pulping) can be seen in Figure 1.

 

Specific energy consumption conventional pulp production

Figure 1: Specific energy consumption (in MJ/t, primary axis) and specific emissions (kg CO2/t, secondary axis) of each step of the sulfate process for conventional pulp production. Fuels are depicted in dark red, electricity in light red

 

This project focuses on emissions directly related to the production process and allocated to Scopes 1 or 2 of the GHG Protocol. Scope 1 emissions are directly caused by the production process (e.g. via the combustion of natural gas), while Scope 2 emissions are indirect emissions that occur elsewhere during the generation of the energy used in the production process. Emissions arising from other sources within the value chain, such as transportation or disposal of the final product, are not included in the present project.

The pellets produced by Creapaper are used in the production of paper to replace a portion of the conventional pulp. In addition to calculating the emissions balance of pellet production, the FfE will also quantify the effects of incorporating grass fiber into paper production. Visualization of the process step results in the style of Figure 1 and visual comparisons to conventional processes will support an intuitive understanding of the project results.

 In a continuation of the research begun in Dynamis Industriesektor (results currently only available in German), the results of this project will also allow the use of grass fiber pellets to be added to the catalog of measures for CO2‑abatement in the paper industry if the results indicate emissions savings. Such catalogs are a key tool for the development of decarbonization strategies quickly becoming necessary in each industrial sector in order to reach the climate goals of the German government.

 

Further Information:

 

Sources:

[1]   Umweltbundesamt: Emissionen. Published 30.07.2020, accessed 13.10.2020
[2] Fattler, Steffen et al.: Dynamis Hauptbericht - Dynamische und intersektorale Maßnahmenbewertung zur kosteneffizienten Dekarbonisierung des Energiesystems. München: Forschungsstelle für Energiewirtschaft e.V., 2019



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