Granular bed baffled reactor (Grabbr): solution to a two-phase anaerobic digestion system

M. I. Baloch, Joseph C. Akunna

Research output: Contribution to journalArticle

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Abstract

A single unit anaerobic granular bed baffled reactor (GRABBR) is proposed as an alternative to a separately operated two-phase anaerobic digestion system. This overcomes the problems related to wastewater treatment at high loading rates which usually results in accumulation of intermediate acid products, and consequently inhibits methanogenesis. This study was carried out to evaluate the stability of a five compartment GRABBR system when treating synthetic glucose wastewater at various operational conditions. The reactor was started with volumetric organic loading rate (OLR) of 1 kg chemical oxygen demand (COD)/m3  day, equivalent to 120 h hydraulic retention time (HRT), and loading rates were gradually increased at suitable intervals to up to 20 kg COD/ day (6 h HRT). At steady state, the overall soluble COD (SCOD) removal was over 95% under all applied loading conditions. At lower loadings, the reactor operated as a completely mixed system, and most of the treatment was achieved in the first compartment. At higher loadings, the entire system transformed into different phases, acidogenesis being dominant near the influent point, whilst methanogenesis was the main activity in the compartments near the effluent point. Granule breaking and flotation was observed in the acidogenic zone, whilst the methanogenic zone retained its original granular form. High assimilation rate of influent nitrogen was observed in the first compartment with the formation of nongranular biomass, identified as Klebsiella pneumoniae. The success of GRABBR as a single unit two-phase anaerobic digestion system could save the cost of an extra unit traditionally employed to achieve similar goals in treatment of high strength wastewaters.
Original languageEnglish
Pages (from-to)1015-1021
Number of pages7
JournalJournal of Environmental Engineering, ASCE
Volume129
Issue number11
DOIs
StatePublished - Nov 2003

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Anaerobic digestion
Chemical oxygen demand
Wastewater
Hydraulics
Sex Differentiation
chemical oxygen demand
digestion
wastewater
Flotation
Wastewater treatment
Glucose
Effluents
Biomass
Nitrogen
Removal
Acids
Costs
Bibliography of Medicine
Galactosylceramidase
Panthera

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Baloch, M. I.; Akunna, Joseph C. / Granular bed baffled reactor (Grabbr) : solution to a two-phase anaerobic digestion system.

In: Journal of Environmental Engineering, ASCE, Vol. 129, No. 11, 11.2003, p. 1015-1021.

Research output: Contribution to journalArticle

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Granular bed baffled reactor (Grabbr) : solution to a two-phase anaerobic digestion system. / Baloch, M. I.; Akunna, Joseph C.

In: Journal of Environmental Engineering, ASCE, Vol. 129, No. 11, 11.2003, p. 1015-1021.

Research output: Contribution to journalArticle

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