An efficient dark fermentative hydrogen production by GMV control of pH

ÖZYURT B., SOYSAL F., YILMAZER HİTİT Z., CAMCIOĞLU Ş., AKAY B., ERTUNÇ S.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.44, sa.36, ss.19709-19718, 2019 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 44 Sayı: 36
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.ijhydene.2019.06.048
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.19709-19718
  • Anahtar Kelimeler: Biohydrogen, Dark fermentation, Clostridium butyricum, On-line pH control, GMV control, MINIMUM-VARIANCE CONTROL, BIOHYDROGEN PRODUCTION, CLOSTRIDIUM-BUTYRICUM, SEQUENTIAL DARK, TEMPERATURE, GLUCOSE, OPTIMIZATION, STRATEGIES, SUBSTRATE, POTATO
  • Ankara Üniversitesi Adresli: Evet

Özet

This study proposes that the on-line pH control via a model-based adaptive controller markedly improves the dark fermentative hydrogen production. According to the dynamic behavior of the dark fermentation process, pH, which rapidly declines with the beginning of the biogas production, should be precisely controlled around its optimal value in a narrow range. The success of on-line pH control was guaranteed by performing the preliminary simulation studies by experimental data obtained from dynamic analysis to determine ARMAX model order with Recursive Least Squares parameter estimation method and then to control the pH with Generalized Minimum Variance (GMV) controller. On-line control of pH at the optimal value of 6.0 during the 25 h dark fermentation process resulted in 5.4 times higher biogas production, 6.2 times higher biogas production potential, nearly doubled the duration of fermentation, and 18.4% biogas production rate increment in comparison with the uncontrolled pH case. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.