Simulation of Oxygen Concentration Profiles in Piled Compost and its Application the Determination of Adequate Turning Frequencies

Abstract

Compact composting equipment is gradually gaining popularity among businesses that generate food waste and households. These machines are equipped with turning devices and they turn compost materials intermittently in order to maintain aerobic conditions. Turning consumes energy, so its frequency must be considered carefully. In this paper, we present a simulation method to estimate the oxygen concentration profile of static piled compost materials. The simulation is based on the idea that the change in oxygen concentration is driven by the diffusive oxygen supply from the surface of the material and the oxygen consumption of the material. We prove the validity of this method by comparing its results with the results of column experiments. We also present examples of the application of this simulation to determine adequate turning frequencies.