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Optimal design and operation of a UASB reactor for diary cattle manure

Abstract

Optimal design and operation of a planned full-scale UASB reactor at a dairy farm are determined using optimization algorithms based on steady state simulations of a dynamic AD process model combined with models of the reactor temperature and heat exchanger temperatures based on energy balances. Available feedstock is 6 m3/d dairy manure produced by the herd. Three alternative optimization problems are solved: Maximization of produced methane gas flow, minimization of reactor volume, and maximization of power surplus. Constraints of the optimization problems are an upper limit of the VFA concentration, and an upper limit of the feed rate corresponding to a normal animal waste production at the farm. The most proper optimization problem appears to be minimization of the reactor volume, assuming that the feed rate is fixed at its upper limit and that the VFA concentration is at its upper limit. The optimal result is a power surplus of 49.8 MWh/y, a hydraulic retention time of 6.1 d, and a reactor temperature of 35.9 °C, assuming heat recovery with an heat exchanger, and perfect reactor heat transfer insulation. In general, the optimal solutions are improved if the ratio of the solids (biomass) retention time to the hydraulic retention time is increased.
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Category

Academic article

Language

English

Author(s)

  • Finn Haugen
  • Rune Bakke
  • Bernt Lie
  • Jon Hovland
  • Knut Vasdal

Affiliation

  • SINTEF Industry / Process Technology
  • University of South-Eastern Norway
  • Diverse norske bedrifter og organisasjoner

Year

2015

Published in

Computers and Electronics in Agriculture

ISSN

0168-1699

Volume

111

Page(s)

203 - 213

View this publication at Norwegian Research Information Repository