Anaerobic Degradability: Effect of Particulate COD

Prashanth, S. A.; Kumar, Pradeep; Mehrotra, Indu

doi:10.1061/(asce)0733-9372(2006)132:4(488)

Cited by 46 publications

(31 citation statements)

References 13 publications

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“…As the F/M ratio gets too high it may be inhibitory or toxic and as it gets too low it may prevent induction of enzymes necessary for biodegradation. (Grady 1985;Prashanth et al 2006). Prashanth et al (2006) studied the F/M values ranged from 0.18 to 2.0 and found the best value to be between 0.57-0.68 for anaerobic digestion of synthetic wastewater.…”

Section: Introductionmentioning

confidence: 98%

Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge

Köksoy

Sanin

2010

Water Science and Technology

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Sludge pretreatment by mechanical, chemical or thermal methods before anaerobic digestion has been applied to increase the digestability of excess sludge. Pretreatment processes rely on their ability to disrupt cell membranes and to release organic materials from the cells into the aqueous phase. Pretreatment by mechanical disintegration has grown rapidly in recent years in parallel with the advances in technology. Ultrasonic sludge disintegration -one of the most commonly used mechanical pretreatment methods- enables the occurrence of cavitation bubbles for the break-up of microorganism cells to extract intracellular materials. The purpose of this study was to conduct disintegration experiments to optimize sonication parameters and to operate subsequent batch anaerobic digesters to examine the effect of food to microorganism ratio (F/M) in sonicated and unsonicated samples. Results showed that high sonication powers and longer treatment times were effective in sludge disintegration in terms of soluble chemical oxygen demand release. Sonicated sludge digested in batch reactors with higher initial F/M ratio caused higher methane generations, higher sludge reductions and had better dewatering characteristics.

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Section: Introductionmentioning

confidence: 98%

Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge

Köksoy

Sanin

2010

Water Science and Technology

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“…Each feedstock has its suitable F/I ratio because of the amount of volatile fatty acids (VFA) and the capacity to buffer the VFA cumulative in the anaerobic process (Lesteur et al 2010). It was reported that a higher F/I ratio may be toxic, while a lower F/I ratio may prevent induction of the enzyme necessary for biodegradation (Prashanth et al 2006). The lag phase of anaerobic digestion could also be affected by this factor (Chen and Hashimoto 1996).…”

Section: Introductionmentioning

confidence: 99%

Biochemical Methane Potential (BMP) of Vinegar Residue and the Influence of Feed to Inoculum Ratios on Biogas Production

Feng

Chen

et al. 2013

BioResources

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“…[20] In this case, when the CODP/VSS ratio increased from 0.1 to 0.9, the kinetic constant for methane generation was reduced by 81%. [20] Finally, the high determination coefficients obtained from the adjustment of the experimental data to the Monod model and the low standard deviations (less than 5% in most cases) of the kinetic parameters derived from this model (Tables 5 and 6) demonstrate the suitability of the use of the Monod kinetic model and suggests that it describes the batch anaerobic digestion processes assayed very accurately and that the kinetic parameters obtained represent the activity of the different microorganism types effecting the anaerobic digestion of this substrate at the different F/M ratios tested.…”

Section: Experimental Run IIImentioning

confidence: 94%

“…[19] Optimum F/M ratios in the range of 0.57 to 0.68 were reported in batch bioassay tests of synthetically prepared complex wastewaters, achieving a decrease in the methane potential and sludge activities at increasing F/M ratios as well as a decrease by 81% in the kinetic constant for methane production when the F/M ratio increased to 0.9. [20] Low F/M ratios (0.5) were also used in batch anaerobic assays of mixtures of glycerin and dairy manure containing 60% glycerin (mixture 1) and 45% glycerin (mixture 2) on the VS basis. [21] Methane yields of 0.31 and 0.22 L/g VS were achieved for mixtures 1 and 2, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of the food to microorganisms (F/M) ratio and temperature on batch anaerobic digestion processes with and without zeolite addition

Montalvo

González

Mena

et al. 2012

Journal of Environmental Science and Health, Part A

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The main objective of this work was to evaluate the influence of the food to microorganisms (F/M) ratio and temperature on batch anaerobic digestion processes carried out with and without zeolite addition as a microbial carrier. Three laboratory-scale experimental runs were conducted using a synthetic substrate with a COD:N:P ratio of 500:5:1. The first run (I) was conducted at a constant temperature of 27°C, increasing the F/M ratio from 0.21 to 0.40 (g COD/g VSS). During the second run (II) the temperature and the F/M ratio increased from 27°C to 37°C and from 0.21 to 0.40, respectively. Finally, in the third experimental run (III) the F/M ratio achieved high values (1.92 and 1.30) either by varying the substrate concentration at a constant biomass concentration or by increasing the biomass concentration at a constant substrate concentration. Higher biomass growth rate, COD removal and methane production were found in the reactors with zeolite, especially at the highest F/M assayed during the first run. The highest ammonium removals were also achieved at the highest F/M ratio (0.40) in the reactors with zeolite. Within the range studied (25°C-37°C) in the reactors with zeolite operating at 37°C, the second run demonstrated the low influence of temperature on substrate consumption and ammonia removal, with 93% and 70% of COD and ammonia removal efficiencies, respectively. The third run corroborated the results previously obtained and fit the experimental results to simple kinetic models, the Monod model being the most adequate for predicting the behavior of the systems studied. The maximum specific microorganism growth rate (μ(max)) values for the reactors with zeolite were almost twice as high as those obtained for the reactors without zeolite for similar F/M ratios.

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Anaerobic Degradability: Effect of Particulate COD

Cited by 46 publications

References 13 publications

Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge

Effect of digester F/M ratio on gas production and sludge minimization of ultrasonically treated sludge

Biochemical Methane Potential (BMP) of Vinegar Residue and the Influence of Feed to Inoculum Ratios on Biogas Production

Influence of the food to microorganisms (F/M) ratio and temperature on batch anaerobic digestion processes with and without zeolite addition

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