Impact of the reactor hydrodynamics and organic loading on the size and activity of anaerobic granules

Arcand, Yves; Guiot, Serge R.; Desrochers, M.; Chavarie, C.

doi:10.1016/0923-0467(94)87028-4

Cited by 53 publications

(54 citation statements)

References 14 publications

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“…The VFA were determined from a 350 lL supernatant sample mixed with an internal standard (iso-butyric acid 300 mg L À1 ). One volume of this sample was mixed with one volume of formic acid 6% (w/v) and 1 lL of this mixture was injected into a Perkin-Elmer Sigma 2000 (Norwalk, USA) gas chromatograph equipped with a flame-ionization detector (FID) and a 76 cm glass column (4 mm ID) filled with Carbowax 20 M (0.3%) and phosphoric acid (0.1%) on 60/80 Carbopack C (Arcand et al, 1994). The samples were collected from the digester and filtered within 15 min of sampling.…”

Section: Methodsmentioning

confidence: 99%

“…Biomass specific activities for glucose, acetate, oxygen and hydrogen were determined in serum bottles by measuring the depletion rate of the given substrate, individually and under nonlimiting conditions, as described in Arcand et al (1994). The biomass is diluted into phosphate buffer (0.05 M) to a final concentration of around 5 g VSS L À1 for the liquid substrate assay and 1-2 g VSS L À1 for the gaseous substrate assay, then transferred into the serum bottles (triplicate).…”

Section: Specific Activity Testsmentioning

confidence: 99%

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The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

Frigon

Bretón

Bruneau

et al. 2009

Bioresource Technology

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The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale Frigon, J.-C.; Breton, J.; Bruneau, T.; Moletta, R.; Guiot, S. R. The treatment of reconstituted whey wastewater was performed in a 400 L digester at 20°C, with an anaerobic digestion step, followed by a step of aerobic treatment at low oxygen concentration in the same digester. In a first set of 48 cycles, total cycle time (T C ) of 2, 3 and 4 days were tested at varying organic loading rates (OLR). The COD removal reached 89 ± 4, 97 ± 3 and 98 ± 2% at T C of 2, 3 and 4 days and OLR of 0.56, 1.04 and 0.78 gCOD L À1 d À1 , respectively. The activity of the biomass decreased for the methanogenic population, while increasing by 400% for the acidogens, demonstrating a displacement in the predominant trophic group in the biomass bed. A second set of 16 cycles was performed with higher soluble oxygen concentration in the bulk liquid (0.5 mg L À1 ) during the aerobic treatment at a T C of 2 days and an OLR of 1.55 gCOD L À1 d À1 , with a soluble COD removal of 88 ± 3%. The biomass specific activities showed a compartmentalization of the trophic group with methanogenic activity maintained in the biomass bed and a high acidogenic activity in the suspended flocs.Crown

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Section: Methodsmentioning

confidence: 99%

Section: Specific Activity Testsmentioning

confidence: 99%

The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

Frigon

Bretón

Bruneau

et al. 2009

Bioresource Technology

Self Cite

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“…High up¯ow velocities eectively removed from the reactor the ®ne 0± 0.5 mm diameter particles of the mixed inocula of UASB granules and activated sludge. This portion decreased from approximately 22 to 1% of the total mass, leaving large and easily settleable granules in the reactor, consistent with the ®ndings of Arcand et al (1994) and Kato et al (1994).…”

Section: Biomass Particle Sizementioning

confidence: 67%

“…Elevated up¯ow velocities have been shown to improve mass transfer and reaction rates, compared to a quiescent UASB. Arcand et al (1994) found the optimum up¯ow velocities to be between 2.2 and 4.4 m/h for UASB granules. Kato et al (1994) observed a distinct increase in reaction kinetics at up¯ow velocities from 2.5 to 5.5 m/h.…”

Section: Biomass Retention In Reactorsmentioning

confidence: 99%

“…For the purposes of mixing and of oxygen transfer to the sludge bed, liquor was recycled from the top of the reactor back to the base of the reactors by means of a peristaltic pump. The recycle rate was set to result in up¯ow velocities of 2 or 4 m/h as suggested by the work of Arcand et al (1994). Oxygenation was achieved by means of a 10-mm ®ne pore stainless steel diuser (Chromatographic Specialties Inc., Brockville, Ont., Canada) which was inserted into a 2.5 Â 30-cm glass column in the recycle line.…”

Section: Objectivementioning

confidence: 99%

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

1999

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Effects of bioaugmentation strategies in UASB reactors with a methanogenic consortium for removal of phenolic compounds

Hajji¹,

Lépine²,

Bisaillon³

et al. 2000

Biotechnol. Bioeng.

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The removal of phenol, ortho- (o-) and para- (p-)cresol was studied with two series of UASB reactors using unacclimatized granular sludges bioaugmented with a consortium enriched against these substances. The parameters studied were the amount of inoculum added to the sludges and the method of immobilization of the inoculum. Two methods were used, adsorption to the biomass or encapsulation within calcium alginate beads. In the bioaugmentation by adsorption experiment, and with a 10% inoculum, complete phenol removal was obtained after 36 d, while 178 d were required in the control reactor. For p-cresol, 95% removal was obtained in the bioaugmented reactor on day 48 while 60 d were required to achieve 90% removal in the control reactor. For o-cresol, the removals were only marginally better with the bioaugmented reactors. Tests performed with the reactors biomass under non-limiting substrate concentrations showed that the specific activities of the bioaugmented biomasses were larger than the original biomass for phenol, and p-cresol even after 276 of operations, showing that the inoculum bacteria successfully colonized the sludge granules. Immobilization of the inoculum by encapsulation in calcium alginate beads, was performed with 10% of the inoculum. Results showed that the best activities were obtained when the consortium was encapsulated alone and the beads added to the sludges. This reactor presented excellent activity and the highest removal of the various phenolic compounds a few days after start-up. After 90 d, a high-phenolic compounds removal was still observed, demonstrating the effectiveness of the encapsulation technique for the start-up and maintenance of high-removal activities.

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Impact of the reactor hydrodynamics and organic loading on the size and activity of anaerobic granules

Cited by 53 publications

References 14 publications

The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

The treatment of cheese whey wastewater by sequential anaerobic and aerobic steps in a single digester at pilot scale

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

Effects of bioaugmentation strategies in UASB reactors with a methanogenic consortium for removal of phenolic compounds

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