Temperature and pH effect on methane production from buffalo manure anaerobic Digestion

Carotenuto, Claudia; Guarino, Giovanna; Morrone, Biagio; Minale, Mario

doi:10.18280/ijht.34s233

Cited by 26 publications

(11 citation statements)

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“…However, the range of 5.5–6.5 is more favourable for the activity of hydrolytic and acidogenic bacteria. The pH of the bioreactor is a critical factor for the decomposition of the anaerobic digester as it may cause perturbations on the microbiome dynamics and the subsequent metabolomic pathways (Carotenuto et al, 2016). Microbial activity is inhibited when the microbiome is exposed to low pH values, which impedes the digester operation.…”

Section: Resultsmentioning

confidence: 99%

Elevated biogas production from the anaerobic co-digestion of farmhouse waste: Insight into the process performance and kinetics

Achinas

Euverink

2019

Waste Manag Res

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The biodegradable portion of solid waste generated in farmhouses can be treated for energy recovery with small portable biogas plants. This action can be done across the Netherlands and all around the planet. This study aims to appraise the performance of anaerobic digestion of different wastes (cow manure, food waste and garden waste) obtained from a regional farmhouse. Batch reactors were established under mesophilic conditions in order to investigate the impact of ternary mixtures on the anaerobic digestion process performance. Different mixing ratios were set in the batch tests. The upshots from the experiments connoted that ternary digestion with cow manure:food waste:garden waste mixing ratio of 40:50:10 yielded higher biogas amount. The kinetics’ results showed quite good congruence with the experimental study. The results from the kinetic analysis appeared to be in line with the experimental one.

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Section: Resultsmentioning

confidence: 99%

Elevated biogas production from the anaerobic co-digestion of farmhouse waste: Insight into the process performance and kinetics

Achinas

Euverink

2019

Waste Manag Res

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“…Overall, the methane data indicates that the digestion kinetic is speeded up in the new process conditions. Carotenuto et al [29] hypothesised that this may be due to not only the increase of temperature that typically enhances the chemical kinetics, but also to the higher initial pH that may promote the hydrogenotrophic methanogenesis during which CO2 and H2 are converted into CH4 and H20 [30]. Also the pH decrease suggests that the acidogenic phase is well operated; during this phase, fatty acids are released due to the degradation of substrate cellulosic material.…”

Section: Resultsmentioning

confidence: 99%

Biogas Production from Anaerobic Digestion of Manure at Different Operative Conditions

Carotenuto¹,

Guarino²,

Minale³

et al. 2016

IJHT

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Anaerobic digestion is an established technology to simultaneously produce biogas and treat different kinds of wastes. This work deals with water buffalo manure digested under mesophilic (37°C) and thermophilic (55°C) conditions with initial pH varying from 6.0 to 8.7. The digestion is investigated following the evolution of the biogas composition in time, in terms of the volume fraction of CH4, CO2 and their ratio. The growths of the biogas products are interpolated with a Gompertz equation and in all the investigated cases the methane productivity is above 63% with a CH4/CO2 ratio rather high and equal to about 2. In mesophilic conditions, an initial pH of 7.0 must be preferred to optimize the methane yield and to minimize the time required to attain it. The thermophilic conditions resulted very promising since they almost halved the time required to reach the final yield. The speed up of the process at 55°C, in our case, resulted to be due to the increase of the digestion kinetic more than to the selection of a new metabolic pathway.

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“…However, hydrolytic and acidogenic bacteria prefer pH values within the range of 5.5-6.5. The pH of the digester influences the degradation of organic matter, as fluctuations cause disturbances in the microbial activities and the subsequent metabolomics pathways [45][46][47]. Low pH values can significantly inhibit the reactor operation and subsequently, the digester comes to a 'sour' situation.…”

Section: Ph and Alkalinitymentioning

confidence: 99%

“…Low pH values can significantly inhibit the reactor operation and subsequently, the digester comes to a 'sour' situation. This is ascribed to the production and accumulation of volatile fatty acids (VFA) in the initial phase of anaerobic digestion [45][46][47][48].…”

Section: Ph and Alkalinitymentioning

confidence: 99%

Effect of Combined Inoculation on Biogas Production from Hardly Degradable Material

Achinas

Euverink

2019

Energies

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The goal of this research was to appraise the effect of combined inoculation on the performance of anaerobic digesters treating hardly degradable material, and particularly the pressed fine sieved fraction (PFSF) derived from wastewater treatment plants (WWTPs). Batch tests were conducted in mesophilic conditions in order to examine the optimal mixing ratio of inoculums. Mixing ratios of 100:0, 75:25, 50:50, 25:75, and 0:100 of three different inoculums were applied in the batch tests. The findings indicated that the inoculation of digested activated sludge with digested organic fraction of municipal solid waste (MSW) in the ratio 25:75 resulted in a higher PFSF degradation and a higher biogas yield. The results from the kinetic analysis fit well with the results from the batch experiment.

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Temperature and pH effect on methane production from buffalo manure anaerobic Digestion

Cited by 26 publications

References 0 publications

Elevated biogas production from the anaerobic co-digestion of farmhouse waste: Insight into the process performance and kinetics

Elevated biogas production from the anaerobic co-digestion of farmhouse waste: Insight into the process performance and kinetics

Biogas Production from Anaerobic Digestion of Manure at Different Operative Conditions

Effect of Combined Inoculation on Biogas Production from Hardly Degradable Material

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