Thesis
EXPLORING ANAEROBIC DIGESTION OF DAIRY MANURE AND ITS POTENTIAL SOIL APPLICATIONS
Washington State University
Master of Science (MS), Washington State University
07/2024
DOI:
https://doi.org/10.7273/000007107
Abstract
This study conducts a comprehensive statistical analysis to evaluate the impact of different treatments on biogas production and assesses the effectiveness of anaerobic digestion processes. Analysis of total solids (TS) and volatile solids (VS) before and after digestion demonstrates a significant reduction in both TS and VS content across all treatment conditions. For instance, the 37°C treatment showed a decrease in VS from an initial value of 6.38% to a final value of
2.96%, while the GAC 37°C treatment exhibited a decrease from 6.38% to 3.26%. Similarly, the TS decreased from 8.01% to 4.01% in the 37°C treatment, and from 8.01% to 4.89% in the GAC 37°C treatment. Removal efficiencies of volatile solids show that higher temperatures enhance removal rates, with approximately 53.6% removal efficiency at 37°C and 60.9% at 55°C, while the presence of GAC slightly reduces removal efficiency compared to treatments without GAC. The study also compares two kinetic models, the first-order kinetic model and the Cone model, to analyze biogas production kinetics. While the first-order model provides insights into the exponential stage of gas production, the Cone model offers a better fit to the data and predicts methane yield more accurately, with root mean square prediction error (rMSPE) values ranging from 1.7087% to 6.836%. These findings contribute to advancing understanding and refining models for optimizing anaerobic digestion processes and maximizing biogas yields for sustainable energy production.
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Details
- Title
- EXPLORING ANAEROBIC DIGESTION OF DAIRY MANURE AND ITS POTENTIAL SOIL APPLICATIONS
- Creators
- Sarah L. Witherrite
- Contributors
- Shulin Chen (Chair)Liang Yu (Committee Member)Tarah Sullivan (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Biological Systems Engineering
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 74
- Identifiers
- 99901152641101842
- Language
- English
- Resource Type
- Thesis