Spatial Modeling of the Composting Process

• Author / Creator

  Lukyanova, Anastasia

• Spatial heterogeneity is an important characteristic of large-scale composting, however, only a few spatial models for composting exist to date. In this thesis, a novel spatial model for composting is developed. The model is applicable for any one-, two-, or three-dimensional pile geometry. It accounts for the consumption of organic matter and therefore considers the whole composting process from the beginning to the end of decomposition, gives a realistic prediction of the buoyant air flow patterns, incorporates the cooling by passing air, and includes the effects of compaction. The model is validated using existing data from a series of in-vessel composting experiments, and then utilized to simulate windrow composting. Effects of the windrow size variation are explored and it is demonstrated that decomposition speed increases as the pile height increases, however, for large piles this increase becomes smaller as oxygen concentration limitations become significant. Air floor technology is simulated, demonstrating a significant decrease in decomposition time even for passive aeration. The developed model can be a useful tool in process optimization and facility design.

• Subjects / Keywords

  • Composting model
  • spatial model
  • airflow
  • streamlines
  • windrow

• Graduation date

  Spring 2012

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3DN4065R

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.