Disintegration of Sludge by Sonication and Improvement of Methane Production Rates in Batch Anaerobic Digesters

2012 ◽  
Vol 41 (4) ◽  
pp. 396-402 ◽  
Author(s):  
Gozde T. Zorba ◽  
F. Dilek Sanin
Keyword(s):  
Methane Production ◽  
Production Rates ◽  
Anaerobic Digesters

scholarly journals Microbiota of anaerobic digesters in a full-scale wastewater treatment plant

2017 ◽  
Vol 43 (3) ◽  
pp. 53-60 ◽  
Author(s):  
Piotr Świątczak ◽  
Agnieszka Cydzik-Kwiatkowska ◽  
Paulina Rusanowska
Keyword(s):  
Microbial Community ◽  
Sewage Sludge ◽  
Methane Production ◽  
Treatment Plant ◽  
Full Scale ◽  
Successful Implementation ◽  
Anaerobic Digesters ◽  
Syntrophic Bacteria ◽  
The Stability ◽  
Microbial Groups

AbstractAnaerobic digestion is an important technology for the bio-based economy. The stability of the process is crucial for its successful implementation and depends on the structure and functional stability of the microbial community. In this study, the total microbial community was analyzed during mesophilic fermentation of sewage sludge in full-scale digesters.The digesters operated at 34–35°C, and a mixture of primary and excess sludge at a ratio of 2:1 was added to the digesters at 550 m3/d, for a sludge load of 0.054 m3/(m3·d). The amount and composition of biogas were determined. The microbial structure of the biomass from the digesters was investigated with use of next-generation sequencing.The percentage of methanogens in the biomass reached 21%, resulting in high quality biogas (over 61% methane content). The abundance of syntrophic bacteria was 4.47%, and stable methane production occurred at a Methanomicrobia to Synergistia ratio of 4.6:1.0. The two most numerous genera of methanogens (about 11% total) wereMethanosaetaandMethanolinea, indicating that, at the low substrate loading in the digester, the acetoclastic and hydrogenotrophic paths of methane production were equally important. The high abundance of the orderBacteroidetes, including the classCytophagia(11.6% of all sequences), indicated the high potential of the biomass for efficient degradation of lignocellulitic substances, and for degradation of protein and amino acids to acetate and ammonia.This study sheds light on the ecology of microbial groups that are involved in mesophilic fermentation in mature, stably-performing microbiota in full-scale reactors fed with sewage sludge under low substrate loading.

Nanoparticles in Methane Production from Anaerobic Digesters

2020 ◽  
pp. 202-232
Author(s):  
Efraín Reyes Cruz ◽  
Lilia Ernestina Montañez Hernández ◽  
Inty Omar Hernández De Lira ◽  
Nagamani Balagurusamy
Keyword(s):  
Methane Production ◽  
Anaerobic Digesters

Application of Methanobrevibacter acididurans in anaerobic digestion

2004 ◽  
Vol 50 (6) ◽  
pp. 109-114 ◽  
Author(s):  
D.V. Savant ◽  
D.R. Ranade
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Methane Production ◽  
Volatile Fatty Acids ◽  
Low Ph ◽  
Anaerobic Digesters ◽  
Hydrogenotrophic Methanogen ◽  
Distillery Wastewater ◽  
Acid Tolerant ◽  
Acidic Conditions

To operate anaerobic digesters successfully under acidic conditions, hydrogen utilizing methanogens which can grow efficiently at low pH and tolerate high volatile fatty acids (VFA) are desirable. An acid tolerant hydrogenotrophic methanogen viz. Methanobrevibacter acididurans isolated from slurry of an anaerobic digester running on alcohol distillery wastewater has been described earlier by this lab. This organism could grow optimally at pH 6.0. In the experiments reported herein, M. acididurans showed better methanogenesis under acidic conditions with high VFA, particularly acetate, than Methanobacterium bryantii, a common hydrogenotrophic inhabitant of anaerobic digesters. Addition of M. acididurans culture to digesting slurry of acidogenic as well as methanogenic digesters running on distillery wastewater showed increase in methane production and decrease in accumulation of volatile fatty acids. The results proved the feasibility of application of M. acididurans in anaerobic digesters.

scholarly journals Methods for the Evaluation of Industrial Mechanical Pretreatments before Anaerobic Digesters

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 860 ◽  
Author(s):  
Helen Coarita Fernandez ◽  
Diana Amaya Ramirez ◽  
Ruben Teixeira Franco ◽  
Pierre Buffière ◽  
Rémy Bayard
Keyword(s):  
Particle Size ◽  
Rheological Properties ◽  
Production Rate ◽  
Methane Production ◽  
Water Retention Capacity ◽  
Retention Capacity ◽  
Anaerobic Digesters ◽  
Before And After ◽  
Methane Potential ◽  
Methane Production Rate

Different methods were tested to evaluate the performance of a pretreatment before anaerobic digestion. Besides conventional biochemical parameters, such as the biochemical methane potential (BMP), the methane production rate, or the extent of solubilization of organic compounds, methods for physical characterization were also developed in the present work. Criteria, such as the particle size distribution, the water retention capacity, and the rheological properties, were thus measured. These methods were tested on samples taken in two full-scale digesters operating with cattle manure as a substrate and using hammer mills. The comparison of samples taken before and after the pretreatment unit showed no significant improvement in the methane potential. However, the methane production rate increased by 15% and 26% for the two hammer mills, respectively. A relevant improvement of the rheological properties was also observed. This feature is likely correlated with the average reduction in particle size during the pretreatment operation, but these results needs confirmation in a wider range of systems.

Modelling the long-term effect of wastewater compositions on maximum sulfide and methane production rates of sewer biofilm

2018 ◽  
Vol 129 ◽  
pp. 58-65 ◽  
Author(s):  
Jing Sun ◽  
Bing-Jie Ni ◽  
Keshab Raj Sharma ◽  
Qilin Wang ◽  
Shihu Hu ◽  
...  
Keyword(s):  
Methane Production ◽  
Term Effect ◽  
Production Rates ◽  
Long Term Effect

Study of Methane Production by High Temperature Anaerobic Fermentation of Chicken Manure and Stalks

2020 ◽  
Vol 14 (4) ◽  
pp. 551-557
Author(s):  
Yongku Li ◽  
Xiaomin Hu ◽  
Lei Feng
Keyword(s):  
High Temperature ◽  
Anaerobic Digestion ◽  
Production Rate ◽  
Methane Production ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Gas Production ◽  
Chicken Manure ◽  
Biogas Slurry ◽  
Production Rates

The changing parameters, as the biogas production rate, the methane production rate, the cumulative biogas amount, the cumulative methane amount, the biogas composition, pH etc. in high temperature anaerobic fermentation of chicken manure and stalks were analyzed by experiments with different mass ratios of chicken manure or livestock manure and stalks with a high C/N ratio. The methane production mechanism of high temperature anaerobic digestion of chicken manure and stalks was discussed in detail. It showed that not only the biogas production rates but also the methane production rates of R1–R7 demonstrated the trend of initial increase and then decrease after 50 d of high temperature anaerobic digestion. Besides, the gas production of R1 with pure chicken manure stopped on the 30th d of the reaction. The gas production of other groups R2–R7 also stopped on the corresponding 34th, 36th, 36th, 37th, 37th, and 37th day, respectively. At the end of the reaction, the cumulative biogas amounts and the cumulative methane amounts of R1–R7 were 411.58 and 269.54, 459.91 and 314.41, 425.32 and 294.11, 401.85 and 272.54, 382.63 and 257.07, 363.04 and 218.16, and 257.15 and 160.10 N ml/(g VS). The biogas slurry pH of R1–R7 all demonstrated a trend of initial decrease and then increase, e. g., pH of R2 reached the minimum of 5.94 on the 5th day. pH values of other groups were between 6.01 and 6.39. After the addition of 4 g of sodium bicarbonate on the 7th day, biogas slurry pH of R1–R7 all increased. pH was maintained between 7.16 and 7.44 until the end of the reaction.

scholarly journals Microbial methane production rates in gas hydrate-bearing sediments from the eastern Nankai Trough, off central Japan

2009 ◽  
Vol 43 (5) ◽  
pp. 315-321 ◽  
Author(s):  
HIDEYOSHI YOSHIOKA ◽  
SUSUMU SAKATA ◽  
BARRY A. CRAGG ◽  
R. JOHN PARKES ◽  
TETSUYA FUJII
Keyword(s):  
Gas Hydrate ◽  
Methane Production ◽  
Nankai Trough ◽  
Production Rates ◽  
Central Japan ◽  
Hydrate Bearing Sediments

Methane production in the rumen and lower gut of sheep given lucerne chaff: effect of level of intake

1978 ◽  
Vol 39 (2) ◽  
pp. 337-345 ◽  
Author(s):  
R. M. Murray ◽  
A. M. Bryant ◽  
R. A. Leng
Keyword(s):  
Organic Matter ◽  
Fatty Acid ◽  
Medicago Sativa ◽  
Isotope Dilution ◽  
Methane Production ◽  
Volatile Fatty Acid ◽  
Significant Contribution ◽  
Production Rates ◽  
End Products ◽  
Low Levels

1. Methane production rates were estimated simultaneously in the rumen and caecum of sheep given 200, 400, 600, 800 and 1000 g lucerne (Medicago sativa) chaff/d using isotope dilution techniques. Estimates were also made of volatile fatty acid (VFA) production in the rumen at each level of feeding. In all studies three to four animals were used at each level of intake.2. Production of VFA and of methane were both related to digestible energy (de) intake. Regression lines for both VFA production and methane production v.de intake had significant intercepts indicating an input of endogenous, fermentable organic matter into the rumen in excess of 50 g/d.3. The values obtained for rates of methane production were compared with those calculated from stoicheiometric equations relating rates of methane and VFA production. Comparisons of methane production with that predicted from de intake were also made.4. Balances for digestion of food determined for the rumen indicated that the energies in the end-products were more than 100% of the de intakes at low intakes of lucerne chaff. Correction for fermentation of apparent endogenous materials resulted in more realistic values. Endogenous materials appeared to make a significant contribution to VFA and methane production, particularly at low levels of intake.

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