Development of a mass-diffusion SIMILE model for predicting ammonia emission from cattle straw manure subjected to different storage conditions

Supervisor

Egbert Lantinga (FSE Wageningen UR)

Introduction

Storage of solid manure is a major source of emissions of NH3, N2O, N2 and CH4. The extent of these losses depends on storage conditions that are important in reducing the production and emission of various gases released by composting and other storage processes. Mass flow and diffusion are major phenomena that transport NH3 or NH4+ towards the manure surface. However, there is no reliable model to predict the relationship between ammonia concentration and its emission at different depths of chopped and mixed cattle straw manure heaps from contrasting storage conditions.

Hypothesis

Gaseous and aqueous ammonia concentration gradients in manure heaps will influence its releasing pattern as affected by storage conditions.

Objectives

  • To develop a mass-diffusion model of ammonia emission from manure heaps for contrasting storage conditions
  • To measure movement of ammonia gas and liquid components inside the manure heaps
  • To check co-relations for developing relational equations for ammonia concentration and its emission at different depths of cattle straw manure heaps
  • To understand the mechanism of gaseous emissions from contrasting storage conditions

Experiences gained

  • Setting up an experiment during manure storage.
  • NH3 measurement techniques.
  • Statistical analysis and interpretation of the results.
  • Writing a compact thesis in the form of a publication in English.