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

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

Renewable Energy, 2009, vol. 34, issue 5, 1245-1251

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.

Keywords: Anaerobic digestion; Biomass concentration; Biological activity; Granular sludge; UASFF bioreactor (search for similar items in EconPapers)
Date: 2009
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148108003546
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:34:y:2009:i:5:p:1245-1251

DOI: 10.1016/j.renene.2008.10.013

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().