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Gewählte Master / Diploma Thesis:

Theresa Krexner (2020): Life cycle assessment of biogas and nano-cellulose production from elephant manure.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 119. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Nano fibrillated cellulose (NFC) is a unique new material with a wide range of potential applications; still research of environmental impacts in the industrial scale is scarce. The step from raw material (pulp is commonly used) to NFC requires a lot of energy. In this thesis a new approach to produce NFC from the fermentation residue of anaerobically digested elephant manure (manure scenario; MS) is compared to the production from Kraft pulp from hardwood chips (wood chips scenario; WCS). A proxy approach is used to upscale MS from a laboratory to an industrial scale (except for the pulp to NFC step) to ensure comparability. Since the MS is a multi-output process (biogas and NFC) a biogas plant with maize silage and pig slurry as substrate is added to WCS for comparison of equal benefits. The impact categories (global warming potential (GWP), fossil resource scarcity, freshwater eutrophication (FEP), human toxicity, terrestrial acidification (TAP) and terrestrial ecotoxicity potential (TEP)) are analysed referring to the functional unit of 1 kg NFC with Recipe2016 (H) method and the Ecoinvent database v3.6. Results show that MS has lower impacts in all assessed categories. GWP is 4,41 kg CO2 eq./kg NFC in MS; 9,74 kg CO2 eq./kg NFC in WCS. The pulp to NFC step is identified as hotspot in both scenarios causing 35,11 % (MS) and 21,79 % (WCS) in TEP and 81,49 % (MS) and 93,38 % (WCS) in FEP, which is in line with other studies. Biogas production has the lowest impact in FEP of MS and WCS (13,22 %; 5,14 %, respectively), and the highest impacts in TAP (74,46 %, MS) and TEP (25,66 %; WCS). Resultant, maize silage production is found as another hotspot. Pulp production has the highest impact in TEP of MS and WCS (39,24 %; 19 %, respectively) and lowest impacts in FEP (5,29 %; MS) and FRS (5,84 %; WCS). The LCA shows that the production of NFC from elephant manure is a sustainable alternative to the production from hardwood Kraft pulp.

Beurteilende*r: Gronauer Andreas
1.Mitwirkender: Kral Iris
2.Mitwirkender: Bauer Alexander

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