Methane Production Rate in Hydraulic Fracturing of Coal Seams

2021 ◽  
Vol 57 (4) ◽  
pp. 595-600
Author(s):  
Yu. M. Lekontsev ◽  
P. V. Sazhin ◽  
A. V. Novik ◽  
Yu. B. Mezentsev
Keyword(s):  
Hydraulic Fracturing ◽  
Production Rate ◽  
Methane Production ◽  
Coal Seams ◽  
Methane Production Rate

Effects of thermochemical pretreatment on the anaerobic digestion of waste activated sludge

1997 ◽  
Vol 35 (8) ◽  
pp. 209-215 ◽  
Author(s):  
Shuzo Tanaka ◽  
Toshio Kobayashi ◽  
Ken-ichi Kamiyama ◽  
Ma. Lolita N. Signey Bildan
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Production Rate ◽  
Methane Production ◽  
Waste Activated Sludge ◽  
Batch Experiments ◽  
Industrial Wastewaters ◽  
Thermochemical Pretreatment ◽  
Chemical Heating ◽  
Methane Production Rate

Effects of pretreatment on the anaerobic digestion of waste activated sludge (WAS) were investigated in terms of VSS solubilization and methane production by batch experiments. The methods of pretreatment studied are NaOH addition (chemical), heating (thermal) and heating with NaOH addition (thermochemical) to the domestic WAS and to the combined WAS from domestic, commercial and industrial wastewaters. The thermochemical pretreatment gave the best result among three methods in the combined WAS, i.e., the VSS was solubilized by 40-50% and the methane production increased by more than 200% over the control when the WAS was heated at 130°C for 5 minutes with the dose 0.3 g NaOH/g VSS. In the domestic WAS, the VSS solubilization rate was 70-80% but the increase of the methane production was about 30% after thermochemically pretreated. The domestic WAS consists of 41% protein, 25% lipid and 14% carbohydrate on COD basis, and the solubilization rate of protein, which is the largest constituent of the WAS, was 63% in the thermochemical pretreatment. Although the effect of the thermochemical pretreatment on the methane production was higher to the combined WAS than to the domestic WAS, the methane production rate was 21.9 ml CH4/g VSSWAS·day in the domestic WAS and 12.8 ml CH4/g VSSWAS·day in the combined WAS.

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.

Upflow anaerobic sludge blanket (UASB) treatment of supernatant of cow manure by thermal pre-treatment

2006 ◽  
Vol 54 (9) ◽  
pp. 221-227 ◽  
Author(s):  
Y. Yoneyama ◽  
A. Nishii ◽  
M. Nishimoto ◽  
N. Yamada ◽  
T. Suzuki
Keyword(s):  
Production Rate ◽  
Methane Production ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Methane Fermentation ◽  
Methane Production Rate ◽  
Pre Treatment ◽  
Anaerobic Sludge Blanket ◽  
Solid Liquid ◽  
Solid Liquid Separation

Upflow anaerobic sludge blanket (UASB) methane fermentation treatment of cow manure that was subjected to screw pressing, thermal treatment and subsequent solid–liquid separation was studied. Conducting batch scale tests at temperatures between 140 and 180 °C, the optimal temperature for sludge settling and the color suppression was found to be between160–170 °C. UASB treatment was carried out with a supernatant obtained from the thermal treatment at the optimal conditions (170 °C for 30 minutes) and polymer-dosed solid–liquid separation. In the UASB treatment with a CODCr loading of 11.7 kg/m3/d and water temperature of 32.2 °C, the CODCr level dropped from 16,360 mg/L in raw water to 3,940 mg/L in treated water (CODCr removal rate of 75.9%), and the methane production rate per CODCr was 0.187 Nm3/kg. Using wastewater thermal-treated at the optimal conditions, also a methane fermentation treatment with a continuously stirred tank reactor (CSTR) was conducted (CODCr in raw water: 38,000 mg/L, hydraulic retention time (HRT): 20 days, 35 °C). At the CODCr loading of 1.9 kg/m3/d, the methane production rate per CODCr was 0.153 Nm3/kg. This result shows that UASB treatment using thermal pre-treatment provides a CODCr loading of four times or more and a methane production rate of 1.3 times higher than the CSTR treatment.

scholarly journals Treatment of sago mill effluent for methane production using anaerobic sequencing batch reactor (ASBR)

2018 ◽  
Vol 2 (1) ◽  
pp. 18-22
Author(s):  
Rafiqqah Mohamad Sabri ◽  
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Methane Production ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Cod Removal ◽  
Production Yield ◽  
Anaerobic Sequencing Batch Reactor ◽  
Methane Production Rate

In this research, sago mill effluent was treated using anaerobic sequencing batch reactor (ASBR). Seven HRT from 10 to 1.5 days were tested to evaluate the methane production from sago mill effluent. The findings revealed the highest methane production rate was found at 1.288 L CH4/L reactor. d under HRT of 2 days The results showed that COD removals decreased from 70% to 47% as HRT was reduced from 10 to 2 days. The HRT 1.5 days was found critical for the studied system, which leads to decreased in methane production, yield and COD removal. Overall, ASBR was capable to treat sago mill effluent in producing methane by means of anaerobic digestion.

Toxicity Effects of Formaldehyde on Methanol Degrading Sludge and Its Anaerobic Conversion in Biobed® Expanded Granular Sludge Bed (EGSB) Reactors

1999 ◽  
Vol 40 (8) ◽  
pp. 195-202 ◽  
Author(s):  
G. Gonzalez-Gil ◽  
R. Kleerebezem ◽  
A. van Aelst ◽  
G. R. Zoutberg ◽  
A. I. Versprille ◽  
...  
Keyword(s):  
Production Rate ◽  
Methane Production ◽  
Granular Sludge ◽  
Gas Phases ◽  
Biomass Retention ◽  
Methane Production Rate ◽  
Formaldehyde Toxicity ◽  
Anaerobic Conversion ◽  
Toxicity Effects ◽  
Degree Of Recovery

Methanogenesis from formaldehyde mainly occurred via intermediates as confirmed by the increased concentrations of methanol and H2 in the liquid and gas phases respectively during formaldehyde conversion. While formaldehyde was readily transformed, the methane production rate was immediately and strongly inhibited. Formaldehyde toxicity was in part reversible since the methane production rate recovered after formaldehyde depletion. This recovery can not be explained by biomass growth. The toxicity of formaldehyde was also in part irreversible, since the degree of recovery was not complete. This loss in the methane production rate likely can be attributed to biomass decay as suggested by its linear relation with the amount of formaldehyde dosed, as well as by scanning electron microscopy observations. The addition of the same amount of formaldehyde either in a slug or in a continuous mode caused the same loss in the methane production rate. Thus for the treatment of formaldehyde-containing streams, a balance between loss in the rate (formaldehyde-related decay) and bacterial growth should be attained. By combining good biomass retention and internal dilution of the wastewater, industrial streams containing formaldehyde can still be treated anaerobically.

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