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Effects of process factors on biological activity of granular sludge grown in an UASFF bioreactor

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Listed:
  • Zinatizadeh, A.A.L.
  • Younesi, H.
  • Bonakdari, H.
  • Pirsaheb, M.
  • Pazouki, M.
  • Najafpour, G.D.
  • Hasnain Isa, M.

Abstract

Control and operation of a hybrid granular sludge reactor are mainly related to biological behavior of the granules under different process conditions. In this study, a 1-l digester was used to examine biological activity of the granules grown in a hybrid anaerobic reactor (AHR). The biogas production process was modeled and analyzed with three-process variables viz., influent COD (3000, 6500 and 10,000mg COD/l), biomass concentration (2000, 4000 and 6000mg VSS/l) and initial alkalinity (200, 1100 and 2000mg CaCO3/l). Experiments were conducted based on a central composite face-centered design (CCFD) and analyzed using response surface methodology (RSM). In order to carry out a comprehensive analysis of the biogas production process, the indicative parameters viz., specific methanogenic activity (SMA), bicarbonate alkalinity produced-to-COD removed ratio, and COD removal were studied as the response. The maximum SMA was modeled to be 0.99g CH4-COD/g VSS d under CODin, initial bicarbonate alkalinity (BA) and biomass concentrations of 10,000mg COD/l, 2000mg CaCO3/l and 2000mg VSS/l, respectively, while the observed value was 1.039g CH4-COD/g VSS d. The maximum COD removal was achieved at the condition when the influent COD was within the range of 4250–5250mg/l and initial BA was more than 1100mg CaCO3/l. Initial BA and CODin played an important role in the production of bicarbonate alkalinity during the digestion process.

Suggested Citation

  • Zinatizadeh, A.A.L. & Younesi, H. & Bonakdari, H. & Pirsaheb, M. & Pazouki, M. & Najafpour, G.D. & Hasnain Isa, M., 2009. "Effects of process factors on biological activity of granular sludge grown in an UASFF bioreactor," Renewable Energy, Elsevier, vol. 34(5), pages 1245-1251.
    • Handle: RePEc:eee:renene:v:34:y:2009:i:5:p:1245-1251
    DOI: 10.1016/j.renene.2008.10.013
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