Effects of oxygenation and upflow liquid velocity on a coupled anaerobic/aerobic reactor system

Stephenson, Robert J.; Patoine, Alain; Guiot, Serge R.

doi:10.1016/s0043-1354(98)00505-3

Cited by 25 publications

(12 citation statements)

References 17 publications

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“…The traditional use of microaerobic condition is connected with desulphurization of biogas, which may bring also detoxification of digesters -decrease of sulphide concentration under toxic level (Buisman et al 1990; Janssen et al and exchange of metabolites may promote system stability (Stephenson et al 1999). …”

Section: Biogas Desulphurizationmentioning

confidence: 99%

“…The coupling of oxidative and reductive environments is common in natural environments since the homogeneous distribution of oxygen is rare (Stephenson et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…It was found out that limited and controlled presence of oxygen inside a digester is not dangerous, it can even have a positive effect in some aspects (Stephenson et al 1999;Zitomer & Shrout 2000;Khanal & Huang 2003a;Tang et al 2004;van der Zee et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Advantages of anaerobic digestion of sludge in microaerobic conditions

Jenı́ček

Koubova

Bindzar

et al. 2010

Water Science and Technology

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The paper reviews results and experience of microaerobic experiments at both high and low sulphide concentrations and evaluates advantages and drawbacks of the anaerobic digestion of sludge in microaerobic conditions as regards biogas quality, digested sludge quality, organic pollutants biodegradability and methanogenic activity of biomass. The innovative microaerobic modification of the anaerobic sludge digestion technology was studied in both laboratory and full scale. Microaerobic conditions are obtained by dosing of a limited amount of the air into the liquid phase of the anaerobic digester. It was shown that anaerobic bacteria including methanogens can be active also in such system. In a mixed culture, even strict anaerobes can survive without inhibition, if the facultative microorganisms are able to consume the present oxygen quickly and fully. Until now, the microaerobic conditions were predominantly used for hydrogen sulphide removal from biogas. In the paper the role of the surplus oxygen was studied also at low sulphide concentration, when the oxygen is consumed in high extent for other processes beside sulphide oxidation.

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Section: Biogas Desulphurizationmentioning

confidence: 99%

“…The coupling of oxidative and reductive environments is common in natural environments since the homogeneous distribution of oxygen is rare (Stephenson et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Advantages of anaerobic digestion of sludge in microaerobic conditions

Jenı́ček

Koubova

Bindzar

et al. 2010

Water Science and Technology

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“…At a high pH, volatile acids are potentially oxidized, and carbon dioxide and hydrogen are more easily absorbed or stripped out (Zitomer, 1998). Therefore, the system with the recycling will enhance volatile fatty acids (VFAs), H 2 S, and CO 2 y = 11.96Ln ( removal, and thus lower the negative impact associated with methanogenesis while maintaining the high activity of the methanogens and denitrifiers (Zitomer and Shrout, 1998;Stephenson et al, 1999;Baloch et al, 2006). Under these conditions, a stable methane percentage of more than 50.0% could be achieved (50% recycling ratio 400%).…”

Section: Effect Of Recycling Ratio On Biogas Compositionmentioning

confidence: 99%

Effect of Recirculation Ratio on Simultaneous Methanogenesis and Nitrogen Removal Using a Combined Up-Flow Anaerobic Sludge Blanket–Membrane Bioreactor

Yang

Wong

et al. 2009

Environmental Engineering Science

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Simultaneous methanogenesis and nitrogen removal using a combined system consisting of an up-flow anaerobic sludge blanket (UASB) and aerobic membrane bioreactor (MBR) was investigated for treating synthetic municipal wastewater. A more reliable effluent quality of above 98.0% total organic carbon (TOC) and 98.0% NH 4 + -N removal was achieved consistently throughout the experiments. Total nitrogen (TN) removal of up to 82.8% could also be achieved when the recycling ratio was increased from 0 to 800%. Analysis of the biogas composition showed that the degradation of NO X À -N through denitrification did not have any obvious effect on the total methane production up to a recycling ratio of 400%. A higher recycling ratio of 800% resulted in an increase of CO 2 and a decrease of CH 4 , due to more sludge being washed out from the UASB into the MBR and recycled back into the UASB, which resulted in a higher dissolved oxygen (DO) concentration in the UASB. Hence, an optimal recycling ratio of 400% was suggested to achieve higher carbon and nitrogen removal efficiencies with over 56.3% methane in the biogas using the new combined system.

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“…Compared with aerobic granulation, coupled granulation requires a lower dissolved oxygen concentration in the bulk phase, typically ranging from 0.3 to 0.6 mg/l (Chen et al 2009;Stephenson et al 1999). Due to the oxygen gradient from the bulk phase to the deeps of the coupled granules, both micro-aerobic and anaerobic conditions exist in the coupled granules.…”

mentioning

confidence: 99%

Cultivation of Biogranules in a Continuous Flow Reactor at Low Dissolved Oxygen

Chen

Lin

Chen

et al. 2009

Water Air Soil Pollut: Focus

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This study investigated sludge granulation inoculated with various mixtures of aerobic and anaerobic sludge at low dissolved oxygen (DO; 0.3-0.6 mg/l) or aerobic (>2.5 mg/l) conditions in four parallel flow reactor systems. Formation of high-density coupled granules was achieved in the reactor system inoculated with anaerobic and aerobic sludge seeds (1:1 mass ratio) at low DO concentrations, with a mean size of 2.5 mm after only 27 days of cultivation. The highest ratio of protein (PN) to polysaccharide (PS; 3.3) was observed for the coupled sludge compared to granules cultivated under aerobic conditions. The PN/PS ratio correlated well with high hydrophobicity, low sludge volumetric index, and compact granular structure. Activity tests of the specific anaerobic and aerobic biomass confirmed that anaerobes and aerobes coexisted in the same coupled granule. Based on the optical microscopic and SEM observations, the process of coupled granule formation was proposed.

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Effects of oxygenation and upflow liquid velocity on a coupled anaerobic/aerobic reactor system

Cited by 25 publications

References 17 publications

Advantages of anaerobic digestion of sludge in microaerobic conditions

Advantages of anaerobic digestion of sludge in microaerobic conditions

Effect of Recirculation Ratio on Simultaneous Methanogenesis and Nitrogen Removal Using a Combined Up-Flow Anaerobic Sludge Blanket–Membrane Bioreactor

Cultivation of Biogranules in a Continuous Flow Reactor at Low Dissolved Oxygen

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