Effect of Voltage on Specific Methanogenic Activity(SMA) in Anaerobic Digestion Reactor

2019 ◽  
Vol 27 (4) ◽  
pp. 67-73
Author(s):  
Hye-Lin Park ◽  
Wei-qi Shi ◽  
Eui-Hwan Hong ◽  
Hang-Bae Jun
Keyword(s):  
Anaerobic Digestion ◽  
Methanogenic Activity ◽  
Specific Methanogenic Activity

scholarly journals Impact of Storage Conditions on the Methanogenic Activity of Anaerobic Digestion Inocula

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1321 ◽  
Author(s):  
Sergi Astals ◽  
Konrad Koch ◽  
Sören Weinrich ◽  
Sasha D. Hafner ◽  
Stephan Tait ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Room Temperature ◽  
Storage Time ◽  
Storage Temperature ◽  
Storage Conditions ◽  
Methanogenic Activity ◽  
Specific Methanogenic Activity ◽  
The Impact ◽  
And Storage ◽  
Over Time

The impact of storage temperature (4, 22 and 37 °C) and storage time (7, 14 and 21 days) on anaerobic digestion inocula was investigated through specific methanogenic activity assays. Experimental results showed that methanogenic activity decreased over time with storage, regardless of storage temperature. However, the rate at which the methanogenic activity decreased was two and five times slower at 4 °C than at 22 and 37 °C, respectively. The inoculum stored at 4 °C and room temperature (22 °C) maintained methanogenic activity close to that of fresh inoculum for 14 days (<10% difference). However, a storage temperature of 4 °C is preferred because of the slower decrease in activity with lengthier storage time. From this research, it was concluded that inoculum storage time should generally be kept to a minimum, but that storage at 4 °C could help maintain methanogenic activity for longer.

Effect of aluminium and sulphate on anaerobic digestion of sludge from wastewater enhanced primary treatment

2003 ◽  
Vol 48 (6) ◽  
pp. 235-240 ◽  
Author(s):  
N. Cabirol ◽  
E.J. Barragán ◽  
A. Durán ◽  
A. Noyola
Keyword(s):  
Anaerobic Digestion ◽  
Methanogenic Bacteria ◽  
Primary Treatment ◽  
The Other ◽  
Bacterial Group ◽  
Methanogenic Activity ◽  
Anaerobic Reactors ◽  
Acetogenic Bacteria ◽  
Individual Effects ◽  
Specific Methanogenic Activity

The combined and individual effects of aluminium and sulphate at concentrations of 1,000 mg/l as Al(OH)3, and 150 mgSO42-/L as K2SO4, respectively, on the anaerobic digestion of sludge from enhanced primary treatment (EPT) were evaluated in 1 L capacity semi continuous reactors. It was found that at 59 days, aluminium inhibits the specific methanogenic activity (SMA) of methanogenic and acetogenic bacteria resulting in a 50% to 72% decrease. Sulphate also inhibits (48% to 65%) the SMA of the same type of bacteria. Methanogenic and acetogenic bacteria were able to adapt, to a different extent, to the assayed concentrations of aluminium and sulphate. However, the combination of aluminium and sulphate resulted in a higher inhibition, especially of the hydrogenophilic methanogenic bacteria. Indeed, this effect remained during the time of the experiment, maintaining an inhibition of 44% at 114 days. Feeding with EPT sludge led to a bigger decrease in SMA of each bacterial group, with respect to the other treatments with time. It is concluded that the acidification of anaerobic reactors fed with EPT sludge is due, among other causes, to the concurrent presence of aluminium and sulphate.

Automated measurements of the specific methanogenic activity of anaerobic digestion biomass

1989 ◽  
Vol 17 (2) ◽  
pp. 425-425 ◽  
Author(s):  
FRANK CONCANNON ◽  
MAURA QUINN ◽  
SILE O'FLAHERTY ◽  
EMER COLLERAN
Keyword(s):  
Anaerobic Digestion ◽  
Methanogenic Activity ◽  
Automated Measurements ◽  
Specific Methanogenic Activity

Anaerobic Digestion of Olive Oil Mill Effluent Pretreated and Stored in Municipal Solid Waste Sanitary Landfills

1993 ◽  
Vol 28 (2) ◽  
pp. 27-34 ◽  
Author(s):  
G. Boari ◽  
I. M. Mancini ◽  
E. Trulli
Keyword(s):  
Anaerobic Digestion ◽  
Municipal Solid Waste ◽  
Olive Oil ◽  
Solid Waste ◽  
Pilot Scale ◽  
Methanogenic Activity ◽  
Sanitary Landfills ◽  
Olive Oil Mill Effluent ◽  
A Cell ◽  
Mesh Sieve

Sanitary landfills of municipal solid waste (MSW) might be used to reduce the storage volume required at plants giving year-round treatment of olive oil mill effluent (OME). A landfill in the methanogenic stage could act as an anaerobic filter and reduce the pollutional load of the OME while also acting as a temporary storage tank. In the present work, a lysimeter in pilot scale was used to simulate a cell of a sanitary landfill. It was filled with MSW screened by a 80 mm mesh sieve mixed to municipal sludge. Results show that when OME was spread on the top of the lysimeter at a loading rate not exceeding 0.4 kgCOD/d/m3 of reactor steady methanogenic activity was maintained in the layers of refuse and a 70% removal of COD was obtained in the OME leachate collected. Higher loading rates reduced methanogenic activity and COD removal efficiency. Nevertheless, the OME collected from the bottom of the landfill was more easily treated by anaerobic digestion than was the raw OME.

Sludge accumulation and methanogenic activity in an anaerobic lagoon

2000 ◽  
Vol 42 (10-11) ◽  
pp. 247-255 ◽  
Author(s):  
J. Paing ◽  
B. Picot ◽  
J. P. Sambuco ◽  
A. Rambaud
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Anaerobic Degradation ◽  
Volatile Fatty Acids ◽  
Anaerobic Fermentation ◽  
Methanogenic Activity ◽  
Start Up ◽  
Anaerobic Lagoon ◽  
Methane Production Rate ◽  
Sludge Accumulation

Sludge accumulation and the characteristics of anaerobic digestion in sludge had been investigated in a primary anaerobic lagoon. Methanogenic potential of sludge was evaluated by an anaerobic digestion test which measured the methane production rate. Sludge was sampled at several points in the lagoon to determine spatial variations and with a monthly frequency from the start-up of the lagoon to observe the development of anaerobic degradation. Maximum amounts of sludge accumulated near the inlet. The mean methane production of sludge was 2.9 ml gVS–1 d–1. Sludge near the outlet presented a greater methanogenic activity and a lesser concentration of volatile fatty acids than near the inlet. The different stages of anaerobic degradation were spatially separated, acidogenesis near the inlet and methanogenesis near the outlet. This staged distribution seemed to increase efficiency of anaerobic fermentation compared with septic tanks. Methane release at the surface of the lagoon was estimated to be very heterogeneous with a mean of 25 l m–2 d–1. The development of performance and sludge characteristics showed the rapid beginning of methanogenesis, three months after the start-up of the anaerobic lagoon. Considering the volume of accumulated sludge, it could however be expected that methanogenic activity would further increase.

scholarly journals Improving Biomethanation of Chicken Manure by Co-Digestion with Ethanol Plant Effluent

2019 ◽  
Vol 16 (24) ◽  
pp. 5023 ◽  
Author(s):  
Dae-Yeol Cheong ◽  
Jeffrey Todd Harvey ◽  
Jinsu Kim ◽  
Changsoo Lee
Keyword(s):  
Loading Rate ◽  
Chicken Manure ◽  
Continuous Reactor ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Methanogenic Activity ◽  
Volatile Solids ◽  
Methane Production Rate ◽  
Specific Methanogenic Activity ◽  
Ethanol Plant

As the global production of chicken manure has steadily increased, its proper management has become a challenging issue. This study examined process effluent from a bioethanol plant as a co-substrate for efficient anaerobic digestion of chicken manure. An anaerobic continuous reactor was operated in mono- and co-digestion modes by adding increasing amounts of the ethanol plant effluent (0%, 10%, and 20% (v/v) of chicken manure). Methanogenic performance improved significantly in terms of both methane production rate and yield (by up to 66% and 36%, respectively), with an increase in organic loading rate over the experimental phases. Correspondingly, the specific methanogenic activity was significantly higher in the co-digestion sludge than in the mono-digestion sludge. The reactor did not suffer any apparent process imbalance, ammonia inhibition, or nutrient limitation throughout the experiment, with the removal of volatile solids being stably maintained (56.3–58.9%). The amount of ethanol plant effluent appears to directly affect the rate of acidification, and its addition at ≥20% (v/v) to chicken manure needs to be avoided to maintain a stable pH. The overall results suggest that anerobic co-digestion with ethanol plant effluent may provide a practical means for the stable treatment and valorization of chicken manure.

Influence of the origin of the inoculum on the anaerobic biodegradability test

2004 ◽  
Vol 49 (1) ◽  
pp. 53-59 ◽  
Author(s):  
I. Moreno-Andrade ◽  
G. Buitrón
Keyword(s):  
Most Probable Number ◽  
Microbial Composition ◽  
Probable Number ◽  
Methanogenic Activity ◽  
Sulfate Reducing ◽  
Anaerobic Biodegradability ◽  
Specific Methanogenic Activity ◽  
Solids Content ◽  
Different Sources ◽  
Selection Of

Five different sources of inocula were studied to determine its influence on biodegradability tests. Inocula were characterized determining granulometry, specific methanogenic activity, solids content, and volumetric sludge index. Also, the fermentative, aceticlastic, hydrogenophilic, OPHA, and sulfate-reducing groups were determined by the most probable number technique. Anaerobic biodegradability tests were conducted with two different substrates, one easy to degrade (glucose) and a toxic one (phenol). The best performance, in terms of percent of biodegradation and lag time, for both substrates, was obtained with the inoculum from a brewery industry UASB. The results can be explained in terms of the initial activity of the inoculum. The influence of the significant variations found in the specific methanogenic activity of the five inocula studied is discussed, in terms of the microbial composition of the samples. The results emphasized the importance of the selection of an appropriate source of inoculum in order to obtain reliable results.

scholarly journals Selection of inocula conditioning methodologies for the anaerobic digestion of food waste

2019 ◽  
pp. 9-18
Author(s):  
Brayan Alexis Parra Orobio ◽  
Melkin Nieto Mendoza ◽  
Diego Rivera Henao ◽  
Pablo Cesar Manyoma Vélasquez ◽  
Patricia Torres Lozada
Keyword(s):  
Anaerobic Digestion ◽  
Latin American ◽  
Food Waste ◽  
Multicriteria Analysis ◽  
Granular Sludge ◽  
Methanogenic Activity ◽  
Significant Events ◽  
Hierarchy Process ◽  
Selection Of ◽  
Main Strategy

Food waste (FW) has a high potential for use in biological processes such as anaerobic digestion (AD), especially due to its high content of biodegradable organic matter. To inoculate the reactors, sludge is usually used. The sludge should ideally have good sedimentation and specific methanogenic activity (SMA), which is typical for granular sludge. However, in a Latin American context, the most available and accessible sludges are flocculants with low sedimentation and SMA. Applying technological surveillance between 1975 and 2017, using multicriteria analysis techniques such as analytical hierarchy process (AHP), and consulting with international and national experts, we observed that there were few studies, compared to published studies on the substrates that focused on improving inoculum quality through conditioning to improve its characteristics and maximize methane production. The inoculum-conditioning methodologies identified were grouped into five categories, being the main strategy the addition of nutrients followed by anaerobic digestion with an easily degradable substrate. However, extension of technological surveillance is recommended by incorporating the results published from significant events in the field of anaerobic digestion, such as the Latin American Workshop and Symposium on Anaerobic Digestion and the World Congress on Anaerobic Digestion.

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