An examination of anaerobic upflow filters operated in a cascade sequence

Cheung, M; Oakley, David; Forster, C.F.

doi:10.1080/09593338609384425

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…El-ShaÐe and Bloodgood1 studied the degradation of a synthetic complex wastewater in a staged anaerobic Ðlter with six compartments. Cheung et al 9 operated and characterised a staged Ðxed bed process with three compartments and observed that methanogenic bacteria were predominant at the top. Comparison with non-staged systems was not done and the microbial studies were based on scanning electron microscopy.…”

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Staged and non-staged anaerobic filters: microbial activity segregation, hydrodynamic behaviour and performance

Alves

Pereira

Мота

et al. 1998

J. Chem. Technol. Biotechnol.

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: This work describes a comparative study of staged and non-staged anaerobic Ðlters for treating a synthetic dairy waste under similar operating conditions. The e †ect of increasing the substrate concentration from 3 to 12 g COD dm~3 at a constant hydraulic residence time (HRT) of 2 days was evaluated with respect to overall reactor performance, biogas production, volatile fatty acids proÐles along the height, methanogenic and acidogenic activity distribution, and hydrodynamic behaviour. The potential maximum speciÐc methanogenic activity against acetate, hydrogen, propionate and butyrate and the lactose speciÐc activity were determined for sludge sampled from three di †erent points in each reactor, under two operating conditions (inÑuent COD of 3 and 9 g COD dm~3). Although all trophic groups involved in the anaerobic process were found throughout the reactors, it was possible to identify di †erent speciÐc sludges at di †erent heights in both reactors. Performances of the two conÐgu-rations were very similar under the operating conditions tested and the plug Ñow behaviour of the staged reactor was clearly reduced when the inÑuent concentration increased from 3 to 9 g COD dm~3.1998 Society of Chemical Industry ( J. Chem. T echnol. Biotechnol. 73, 99È108 (1998)

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Staged and non-staged anaerobic filters: microbial activity segregation, hydrodynamic behaviour and performance

Alves

Pereira

Мота

et al. 1998

J. Chem. Technol. Biotechnol.

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“…There are some laboratory applications of anaerobic filters operating in a staged mode. El‐Shafie and Bloodgood6 studied the degradation of a synthetic complex wastewater in a staged anaerobic filter with six compartments and Cheung et al 7 operated and characterised a staged fixed bed process with three compartments. In a previous work Alves et al 8 compared a staged with a non‐staged anaerobic filter and concluded that, under the operating conditions tested, there was no advantage in using the staged system.…”

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Staged and non-staged anaerobic filters: performance in relation to physical and biological characteristics of microbial aggregates

Alves

Ferreira

Amaral

et al. 2000

J. Chem. Technol. Biotechnol.

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This work describes a comparative study of staged and non-staged anaerobic ®lters for treating a synthetic dairy waste. The effect of decreasing the hydraulic retention time from 2 days to 10 h at a constant substrate concentration of 9 g COD dm À3 by applying lateral feedings in the staged digester was evaluated with respect to overall reactor performance, in comparison with a conventional up-¯ow anaerobic ®lter. There was no advantage on the use of a multi-feed staged system under the operating conditions tested. The overall performance and the microbial activity segregation were similar for both con®gurations. The microbial aggregates present in both digesters, particularly in the top sections, changed signi®cantly in biological, physical and morphological properties. The presence of aggregates larger than 4 mm equivalent diameter in those sections did not prevent a strong washout phenomenon. An effect of disintegration attributed to biogas accumulation and release was observed, when those large particles become smaller and their surface became rougher. Due to biomass accumulation, at the end of the trial period, only 40% of the total volume was occupied by the liquid phase.

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Microbial consortia selection in anaerobic filters operated in different reactor configurations

Harper

Pohland

1997

Water Science and Technology

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An examination of anaerobic upflow filters operated in a cascade sequence

Cited by 3 publications

References 3 publications

Staged and non-staged anaerobic filters: microbial activity segregation, hydrodynamic behaviour and performance

Staged and non-staged anaerobic filters: microbial activity segregation, hydrodynamic behaviour and performance

Staged and non-staged anaerobic filters: performance in relation to physical and biological characteristics of microbial aggregates

Microbial consortia selection in anaerobic filters operated in different reactor configurations

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