%D 2009
%R 10.1016/j.renene.2008.10.013
%N 5
%O cited By 14
%L scholars733
%J Renewable Energy
%X 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 10,000 mg COD/l), biomass concentration (2000, 4000 and 6000 mg VSS/l) and initial alkalinity (200, 1100 and 2000 mg 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 0.99 g CH4-COD/g VSS d under CODin, initial bicarbonate alkalinity (BA) and biomass concentrations of 10,000 mg COD/l, 2000 mg CaCO3/l and 2000 mg VSS/l, respectively, while the observed value was 1.039 g CH4-COD/g VSS d. The maximum COD removal was achieved at the condition when the influent COD was within the range of 4250-5250 mg/l and initial BA was more than 1100 mg CaCO3/l. Initial BA and CODin played an important role in the production of bicarbonate alkalinity during the digestion process. © 2008 Elsevier Ltd. All rights reserved.
%K Anaerobic digestion; Bioactivity; Biogas; Biological materials; Biomass; Bioreactors; Granular materials; Granulation; Industrial chemicals; pH; pH effects; Production engineering; Renewable energy resources; Shape memory effect; Spectrum analyzers, Biogas production; Biological activity; Biological behavior; Biomass concentration; Central composite; Chemical oxygen demand (COD) removal; Comprehensive analysis; Digestion process; Granular sludge; Process conditions; Process factors; Process variables; Response surface methodology (RSA); Sludge reactors; UASFF bioreactor, Sludge digestion, alkalinity; bicarbonate; bioactivity; biogas; biomass; bioreactor; calcium carbonate; chemical oxygen demand; experimental study; gas production; pollutant removal; sludge
%P 1245-1251
%T Effects of process factors on biological activity of granular sludge grown in an UASFF bioreactor
%A A.A.L. Zinatizadeh
%A H. Younesi
%A H. Bonakdari
%A M. Pirsaheb
%A M. Pazouki
%A G.D. Najafpour
%A M. Hasnain Isa
%V 34