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

Zinatizadeh, A.A.L. and Younesi, H. and Bonakdari, H. and Pirsaheb, M. and Pazouki, M. and Najafpour, G.D. and Mohamed Hasnain, Isa (2009) Effects of process factors on biological activity of granular sludge grown in an UASFF bioreactor. Renewable Energy, 34 (5). pp. 1245-1251. ISSN 9601481

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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 10,000 mg COD/l), biomass concentration (2000, 4000 and 6000 mg VSS/l) and initial alkalinity (200, 1100 and 2000 mg CaCO<sub>3</sub>/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 CH<sub>4</sub>-COD/g VSS d under COD<sub>in</sub>, initial bicarbonate alkalinity (BA) and biomass concentrations of 10,000 mg COD/l, 2000 mg CaCO<sub>3</sub>/l and 2000 mg VSS/l, respectively, while the observed value was 1.039 g CH<sub>4</sub>-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 CaCO<sub>3</sub>/l. Initial BA and COD<sub>in</sub> played an important role in the production of bicarbonate alkalinity during the digestion process. © 2008 Elsevier Ltd. All rights reserved.

Item Type:Article
Uncontrolled Keywords:Anaerobic digestion; Biological activity; Biomass concentration; Granular sludge; UASFF bioreactor 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
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Departments / MOR / COE:Departments > Civil Engineering
ID Code:15
Deposited By: Assoc Prof Dr Mohamed Hasnain Isa
Deposited On:17 Feb 2010 04:29
Last Modified:19 Jan 2017 08:26

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