Separation of the propionate degradation to improve the efficiency of thermophilic anaerobic treatment of acidified wastewaters

Wiegant, W.M.; Hennink, M.; Lettinga, G.

doi:10.1016/0043-1354(86)90202-2

Cited by 89 publications

(39 citation statements)

References 19 publications

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“…While acetate is evidently producing methane very quickly, hydrogenotrophic methanogenesis as a subsequent reaction to interspecies hydrogen transfer is possibly a main driving force for faster methane production in the case of hydrolysate. This is in agreement with Wiegant et al (1986) This argumentation has its aws since it is known that thermodynamic constants such as…”

Section: Resultssupporting

confidence: 67%

Demand-driven biogas production in anaerobic filters

Lemmer

Krümpel

2017

Applied Energy

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Section: Resultssupporting

confidence: 67%

Demand-driven biogas production in anaerobic filters

Lemmer

Krümpel

2017

Applied Energy

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“…Figure 2(a) illustrates that the COD removal efficiency was 97-99% for loading rate up to 23 g-COD/l.day, which corresponds to 11500mg/1 of COD in the wastewater and a food-to-microorganism (F/M) ratio of 0.64 g-COD/g-VSS.day. The maximum COD loading rate was comparable to the maximum propionateconverting activity of 25-26 g-COD/I-day in a UASB reactor at 55°C (Wiegant et al, 1986). At the loading rate of 23g-COD/l.day or lower, the effluent had less than 50 mg/I of acetate, 100mg/1 of propionate, and negligible quantities of n-and i-butyrates and n-and i-valerates.…”

Section: Cod Removal Efficiencymentioning

confidence: 66%

“…At 30 g-COD/1.day, although the acetate was still less than 100 mg/l and other VFA remained negligible, the propionate concentration in the effluent increased to the level of 1600 mg/1. This indicated that converting propionate to acetate was the rate-limiting step, which was also observed by Wiegant et al (1986) under thermophilic condition.…”

Section: Cod Removal Efficiencymentioning

confidence: 72%

Performance and sludge characteristics of UASB process treating propionate-rich wastewater

Fang

Chui

1995

Water Research

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Abstract--UASB process consistently removed 97-99% of chemical oxygen demand (COD) in wastewater containing concentrated propionate at 37°C in 12 h for loading rates up to 23 g-COD/l'day. Of all the COD removed, 95% was converted to methane and the rest was converted to biomass with an average sludge yield of 0.040 g-VSS/g-COD. Each gram of propionate-degrading granules in the reactor had a daily maximum capacity of converting 0.60 g of COD into methane. The granules were densely packed but did not exhibit any patterned microstructure. A typical propionate-degrading granule was composed of microcolonies of Methanothrix and several syntrophic microcolonies with hydrogen-producing acetogens in juxtaposition with hydrogen-consuming M. hungatei and Methanobrevibacter-like bacteria.

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“…Hydrogen-producing acetogenesis occurs more difficultly than methanogenesis. The respective DG values for the conversion of acetic acid and H 2 /CO 2 into methane [10] are 226.9 and 2127.74 kJ/mol at 258C [11]. However, the DG values for conversion of propionic and butyric acids into acetic acid were 162.55 and 132.55 kJ/mol, respectively, indicating that methanogenesis commonly occurs in anaerobic wastewater treatment.…”

Section: Role Of Hpas In Rate-limiting Step In Anaerobic Processesmentioning

confidence: 99%

“…Hydrogen-producing acetogenesis exerts a limiting effect on methane fermentation because this process is not as energetic as methanogenesis [8,9]. However, the methanogenic phase is a rate-limiting step in methane fermentation, and this phenomenon is attributed by researchers to the slow growth rate, long generation time, narrow ecological niche, and rigorous living conditions of methanogens [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced methane production through bioaugmentation of butyrate‐oxidizing hydrogen‐producing acetogens in anaerobic wastewater treatment

Wang

Liu

et al. 2017

Env Prog and Sustain Energy

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A feasible and readily available source of hydrogenproducing acetogens (HPAs) was developed by obtaining microflora D83 dominated by butyrate-oxidizing HPAs through enrichment and subculture of anaerobic sludge with the use of butyric acid. The effect of bioaugmentation of D83 both on methane production through glucose fermentation and molasses wastewater treatment was evaluated. At a bacterial number-to-activated sludge ratio of 1:9, inoculation of microflora D83 could enhance methane yield and production rate from glucose by a factor of 2.1 and 2.0, respectively. In treatment of normal molasses wastewater, chemical oxygen demand (COD) removal efficiency improved from 75.6% to 88.2%, and the accumulated methane yield and methane yield obtained through COD removal increased by a factor of 2.3 and 2.0, respectively. Hydrogen-producing acetogenesis is apparently a rate-limiting step in methanogenesis because bioaugmentation of HPAs during methane production improved not only hydrogen-producing acetogenesis but also hydrolysis/acidogenesis and methanogenesis.

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Separation of the propionate degradation to improve the efficiency of thermophilic anaerobic treatment of acidified wastewaters

Cited by 89 publications

References 19 publications

Demand-driven biogas production in anaerobic filters

Demand-driven biogas production in anaerobic filters

Performance and sludge characteristics of UASB process treating propionate-rich wastewater

Enhanced methane production through bioaugmentation of butyrate‐oxidizing hydrogen‐producing acetogens in anaerobic wastewater treatment

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