A simple elemental continuity based model application to study the anaerobic microbial activity for the treatment of dairy manure

Usama Zaher, Pramod Pandey, Shulin Chen

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A simple anaerobic digestion (AD) model was formulated with emphasis on understanding the microbial activity during AD. The model was formulated according to two main rules that regulate the microbial growth. The first rule was maintaining the elemental continuity of macronutrients C, H, N, O, P, and S. The second rule satisfied the thermodynamics of the main AD catabolic reactions: acidogenesis and both acetotrophic and hydrogenotrophic methanogenesis. Accordingly, the stoichiometric parameters were evaluated as functions of the bacterial yield. The model also considered the enzymatic hydrolysis of solid waste. For a known solid waste composition, experimental data was utilized to estimate microbial initial concentrations, yields and kinetics, i.e., to achieve better understanding of the main AD microbial activity. The model was applied to three sets of batch experiments focusing on anaerobic dairy manure degradation. The model predicted the degradation dynamics, estimated the bacterial concentration in different inoculums, and evaluated the effect of inoculum ratios in speeding up the degradation. Elemental continuity based formulation of the model evaluated additional components that are necessary for future studies of macronutrients recovery, limitation/toxic effects, and chemical equilibrium.

Original languageEnglish (US)
Pages (from-to)3553-3564
Number of pages12
JournalApplied Mathematical Modelling
Volume33
Issue number9
DOIs
StatePublished - Sep 1 2009
Externally publishedYes

Keywords

  • Anaerobic digestion
  • Dairy manure
  • Elemental continuity
  • Nutrients recovery
  • Parameter identifiability
  • Process modeling

ASJC Scopus subject areas

  • Modeling and Simulation
  • Applied Mathematics

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