Volatile Fatty Acids Production by Anaerobic Whey Permeate Biodegradation in a Continuous Bioreactor

1998 ◽  
Vol 33 (4) ◽  
pp. 551-564 ◽  
Author(s):  
Nathalie Imbeault ◽  
Marcel Paquet ◽  
Raynald Côté
Keyword(s):  
Fatty Acids ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Transformation Efficiency ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Hydraulic Residence Time ◽  
Whey Permeate ◽  
Continuous Bioreactor ◽  
Initial Load

Abstract This paper addresses the production of volatile fatty acids with fermentation of whey permeate under acidogenic conditions. The coal-immobilized biomass of an anaerobic fluidized bed reactor operated with a fairly constant hydraulic residence time of 12 min transformed the substrate (whey permeate i.e., essentially lactose) into a blend of acetic, propionic, butyric and isobutyric acids corresponding to between 2 and 19, 1 and 6, 11 and 30, 0 and 2% of the initial load (carbon basis), respectively. There was a slight decrease in the sugar transformation efficiency (65 to 48%) with the increase of the organic loading rate (OLR) which varied from 586 to 3339 g sugar/Lreactord. At the highest OLR of 3339 g sugar/Lreactor.d, the biomass transformed 19% of the substrate into a blend of acetic, propionic, butyric and isobutyric acids. Residual sugar and bio-gas were 52 and 2%, respectively, of the initial load (carbon basis). Cet article fait référence L une étude sur la production d’acides gras volatiles par fermentation anaérobie du perméat de lactosérum dans un bioréacteur. La biomasse fixée aux grains de charbon composant le lit fluidisé, opérant avec un temps de rétention hydraulique de 12 minutes, transformait le substrat (perméat i.e., essentiellement lactose) en un mélange d’acide acétique, propionique, n-butyrique et isobutyrique correspondant respectivement L 2 et 19, 1 et 6, 11 et 30, 0 et 2% de la charge initiale (sur la base d’un bilan de carbone). Il a été possible d’observer une légère diminution de l’efficacité de la biodégradation du sucre (65 L 48%) avec une augmentation du taux de charge organique lequel variait de 586 L 3 339 g de sucre/Lréacteurd. L la charge organique la plus forte, soit 3 339 g de sucre/Lréacteur.d, la biomasse transformait le substrat L 19% en un mélange d’acide acétique, propionique, n-butyrique et isobutyrique. La part du sucre résiduel était de 52% et celle du biogaz L 2% (bilan de carbone).

Volatile fatty acids production from food waste: Effects of pH, temperature, and organic loading rate

2013 ◽  
Vol 143 ◽  
pp. 525-530 ◽  
Author(s):  
Jianguo Jiang ◽  
Yujing Zhang ◽  
Kaimin Li ◽  
Quan Wang ◽  
Changxiu Gong ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Effects Of Ph

Volatile fatty acids production from cheese whey: influence of pH, solid retention time and organic loading rate

2018 ◽  
Vol 93 (6) ◽  
pp. 1742-1747 ◽  
Author(s):  
Rolando Rafael Calero ◽  
Borja Lagoa-Costa ◽  
María Mercedes del Coro Fernandez-Feal ◽  
Christian Kennes ◽  
Maria Carmen Veiga
Keyword(s):  
Fatty Acids ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Cheese Whey ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Solid Retention Time ◽  
Influence Of Ph

The Adaptation of Anaerobic Granulated Bed to Changes in Loading Rate and Liquid Upflow Velocity in UASB Reactors

1989 ◽  
Vol 24 (4) ◽  
pp. 523-536 ◽  
Author(s):  
N. Kosaric ◽  
R. Blaszczyk ◽  
L. Orphan
Keyword(s):  
Fatty Acids ◽  
Feed Rate ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Uasb Reactors

Abstract Four 20L UASB reactors, R1, R2, R3 and R4 were operated at different upflow velocities of 0.25, 1.0, 1.5, and 0.5 m/h, respectively. Changes in loading rate were achieved by removing part of granules from the bed at a constant volumetric feed rate of 6.2 g COD/(L day). It was found that the granulated bed may adapt to the increased organic loading rate up to about 1.6 kg COD/(kg VSS day) and achieve a 100% conversion of the COD present (composed of volatile fatty acids). Increasing the loading rate over the above value can bring about a decreased COD conversion. At the organic loading rate of 1.6 kg COD/(kg VSS day), the accumulation of granules in reactors R1 and R4 was observed. At the same loading rate, no accumulation of granules was observed in reactor R2 (within 40 days) and in reactor R3 (within 55 days). It was also found that a great number of large granules were washed out from reactors R1 and R4 when the loading rate of about 0.7 kg COD/(kg VSS day) was maintained for about 70 days.

scholarly journals Specialized trace elements and volatile fatty acids interactions for enhanced methane production and biomethanization process stability during high organic loading rate

2021 ◽  
Vol 38 (1) ◽  
pp. 179-193
Author(s):  
N.C. Ezebuiro ◽  
I. Körner
Keyword(s):  
Fatty Acids ◽  
Trace Elements ◽  
Methane Production ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Total Alkalinity ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Ch4 Production ◽  
Volatile Organic

Volatile fatty acids (VFAs) and trace elements (TEs) interactions (VFAs*TEs) during biomethanization have effects that could be exploited to enhance anaerobic digestion (AD) of biomass. The goal of this study was to validate biocatalytic effects of specialized VFAs*TEs identified from a batch-derived Optimum TEs Configuration (or simply ‘Optimum’) on high organic loading rate (OLR) involving mixed fruit residue (MFR) fed in semi-continuous AD operation. The specialized VFAs*TEs were formulated as Variants of the Optimum and included Optimum –Cobalt (Co) for specialized VFAs*Co effects, and Optimum +Selenium (Se) for specialized VFAs*Se effects. Four duplicate AD reactors were treated with formulations reflecting the Optimum and the Variants. Each duplicate reactor was semi-continuously fed with MFR at varying OLR until instability occurred. Methane production, total volatile organic acidity (FOS) / total alkalinity (TAC) and VFAs fingerprints were measured as main responses. The results showed that reactors of the Optimum and its Variants were unstable at OLR of 8g oDM/L/d, but stability was restored in the Optimum –Co (FOS/TAC values of 0.6 compared to 1.51 and 1.67 for Optimum and Optimum +Se respectively). The average specific CH4 production (Nml/g oDM) of the Optimum and its Variants were Control: 431±36; Optimum: 553±16; Optimum –Co: 580±12; and Optimum +Se: 545±13. Optimum –Co also had the lowest acetic acid and butyric acid accumulation, but had higher propionic acid concentration (0.7 g/L) compared to the Optimum (0.3 g/L) and Optimum +Se (0.4 g/L).

Anaerobic monodigestion of poultry manure: determination of operational parameters for CSTR

2012 ◽  
Vol 65 (1) ◽  
pp. 53-59 ◽  
Author(s):  
R. Chamy ◽  
C. León ◽  
E. Vivanco ◽  
P. Poirrier ◽  
C. Ramos
Keyword(s):  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Poultry Manure ◽  
Organic Loading Rate ◽  
Continuous Stirred Tank Reactor ◽  
Organic Loading ◽  
Operational Parameters ◽  
Volatile Solids ◽  
High Alkalinity ◽  
Vs Removal

In this work the anaerobic monodigestion for the treatment of turkey manure was evaluated, without its codigestion with another substrate. The effect of the organic loading rate (OLR) and the substrate concentration (high total solids (TS) concentration) or product concentration (high volatile fatty acids (VFA) and/or ammonia (NH3-N) concentrations) was studied. The results show that for a continuous stirred tank reactor (CSTR) operation, a maximum of 40 g/L of TS and 4.0 g/L of ammonium (NH4+) was required. In addition, the maximum organic loading rate (OLR) will not exceed 1.5 kg VS/m3d. Higher TS and NH4+ concentrations and OLR lead to a reduction on the methane productivity and volatile solids (VS) removal. During the CSTR operation, a high alkalinity concentration (above 10 g/L CaCO3) was found; this situation allowed maintaining a constant and appropriate pH (close to 7.8), despite the VFA accumulation. In this sense, the alkalinity ratio (α) is a more appropriate control and monitoring parameter of the reactor operation compared to pH. Additionally, with this parameter a VS removal of 80% with a methane productivity of 0.50 m3CH4/m3Rd is achieved.

Extremely fast increase in the organic loading rate during the co-digestion of rapeseed oil and sewage sludge in a CSTR – characterization of granules formed due to CaO addition to maintain process stability

2015 ◽  
Vol 72 (9) ◽  
pp. 1569-1577 ◽  
Author(s):  
M. Kasina ◽  
A. Kleyböcker ◽  
M. Michalik ◽  
H. Würdemann
Keyword(s):  
Fatty Acids ◽  
Sewage Sludge ◽  
Rapeseed Oil ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Long Chain Fatty Acids ◽  
Organic Loading ◽  
Granule Formation ◽  
Fast Increase ◽  
Long Chain

In a co-digestion system running with rapeseed oil and sewage sludge, an extremely fast increase in the organic loading rate was studied to develop a procedure to allow for flexible and demand-driven energy production. The over-acidification of the digestate was successfully prevented by calcium oxide dosage, which resulted in granule formation. Mineralogical analyses revealed that the granules were composed of insoluble salts of long chain fatty acids and calcium and had a porous structure. Long chain fatty acids and calcium formed the outer cover of granules and offered interfaces on the inside thereby enhancing the growth of biofilms. With granule size and age, the pore size increased and indicated degradation of granular interfaces. A stable biogas production up to the organic loading rate of 10.4 kg volatile solids m−3 d−1 was achieved although the hydrogen concentration was not favorable for propionic acid degradation. However, at higher organic loading rates, unbalanced granule formation and degradation were observed. Obviously, the adaption time for biofilm growth was too short to maintain the balance, thereby resulting in a low methane yield.

scholarly journals Effect of Organic Loading Rate on Anaerobic Digestion Performance of Mesophilic (UASB) Reactor Using Cattle Slaughterhouse Wastewater as Substrate

2018 ◽  
Vol 15 (10) ◽  
pp. 2220 ◽  
Author(s):  
Mohammed Musa ◽  
Syazwani Idrus ◽  
Che Hasfalina ◽  
Nik Daud
Keyword(s):  
Methane Concentration ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Cod Removal ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Slaughterhouse Wastewater

In this study, the performance of a laboratory scale upflow anaerobic sludge blanket (UASB) reactor operating at mesophilic temperature (35 °C) was examined. Cattle slaughterhouse wastewater (CSWW) was used as the main substrate. The total and effective volumes of the reactor were 8 L and 6 L, respectively. Twelve different organic loading rates (OLR) were applied and the performance was evaluated. The chemical oxygen demand (COD) removal efficiency was more than 90% during batch study. In the continuous study, COD removal was also approximately 90% at OLR 0.4 g/L d−1 which subsequently dropped to below 50% when the loading rate increased to 15 g/L d−1. Approximately 5 L/d of biogas was obtained with high methane concentration at stages VI and XI corresponding to OLR of 2 and 10 g/L d−1, respectively. It was observed that the concentration of volatile fatty acids was low and that the alkalinity of the wastewater was sufficient to avoid acidification. Specific methane yields of 0.36 and 0.38 LCH4/g COD added were achieved at OLR 7 and 10 g/L d−1. A hydraulic retention time (HRT) of 1 day was sufficient to remove greater than 70% of COD which correspond to 89% methane concentration. Parameters like soluble COD, NH3-N, pH, alkalinity, total suspended solid (TSS), fats, oil, and grease were also investigated. The results show that the UASB reactor could serve as a good alternative for anaerobic treatment of CSWW and methane production.

scholarly journals EFFECT OF OPERATING CONDITIONS ON THE PRODUCTION OF VOLATILE FATTY ACIDS FROM ORGANIC WASTES

2021 ◽  
Author(s):  
Daniel Battaglia
Keyword(s):  
Retention Time ◽  
Volatile Fatty Acids ◽  
Loading Rate ◽  
Operating Conditions ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Optimal Range ◽  
Different Types ◽  
Thermophilic Conditions ◽  
Substrate To Inoculum Ratio

The five parameters being analyzed are pH, temperature, retention time/organic loading rate, substrate to inoculum ratio, and inhibitors of VFAs. The effect of pH has been shown to produce optimal concentrations of VFAs when outside the optimal range of methanogenesis. Temperature sees different types of VFAs being produced at different concentrations dependant on mesophilic or thermophilic conditions. The organic loading rate (OLR) and retention time (RT) demonstrate similar concepts as longer periods of time allow for more VFAs to be converted from the waste but readily supplying waste to digesters sees higher concentrations produced immediately. The substrate to inoculum ratio (S/I) showed ratios above 1 to be favorable in production as it provided enough inoculum (microorganisms) to convert VFAs effectively. Lastly, the effects of several VFA inhibitors are discussed with regards to their impacts on the anaerobic digestion process and their inhibition of certain VFA’s formation.

Sign in / Sign up

Export Citation Format

Share Document