scholarly journals Enhanced biogas production from anaerobic digestion of wastewater from the fruit juice industry by sonolysis: experiments and modelling

2021 ◽  
Author(s):  
Souhaib Zerrouki ◽  
Rachida Rihani ◽  
Karima Lekikot ◽  
Ibtissem Ramdhane
Keyword(s):  
Experimental Data ◽  
Anaerobic Digestion ◽  
Fruit Juice ◽  
Biogas Production ◽  
Batch Reactor ◽  
Low Frequency ◽  
Total Sugars ◽  
Gompertz Equation ◽  
Ultrasound Pretreatment ◽  
Good Agreement

Abstract The aim of this study is to investigate the use of ultrasound pretreatment as potential technique to solubilize organic matter and fermentation of fruit juice effluents in anaerobic batch reactor. The efficacy of ultrasound pretreatment has been assessed at low frequency of 20 kHz and at different sonication times (20, 40 and 60 min). Compared with control, the amount of biogas produced increased by 47, 57 and 60% for sonication times of 20, 40 and 60 min, respectively. Methane content of the produced biogas was about 59% in the control and 64% in the case of effluent subjected to ultrasonic for 60 min. After 20 days of anaerobic digestion of the fruit juice effluents, the efficiency of COD increased by 9, 31 and 35% with respect to control for sonication times of 20, 40 and 60 min, respectively, corresponding to total sugars uptake efficiency of about 35, 51 and 54%, respectively. The modified Gompertz equation was used to describe the cumulative biogas production. A good agreement was found between simulated and experimental data.

scholarly journals Enhancement anaerobic digestion and methane production from kitchen waste by thermal and thermo-chemical pretreatments in batch  leach bed reactor with down flow

2018 ◽  
Vol 64 (No. 3) ◽  
pp. 128-135 ◽  
Author(s):  
Radmard Seyed Abbas ◽  
Alizadeh Hossein Haji Agha ◽  
Seifi Rahman
Keyword(s):  
Anaerobic Digestion ◽  
Microwave Irradiation ◽  
Methane Production ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Lag Phase ◽  
Kitchen Waste ◽  
Gompertz Equation ◽  
Chemical Pretreatments ◽  
Pretreatment Conditions

The effects of thermal (autoclave and microwave irradiation (MW)) and thermo-chemical (autoclave and microwave irradiation – assisted NaOH 5N) pretreatments on the chemical oxygen demand (COD) solubilisation, biogas and methane production of anaerobic digestion kitchen waste (KW) were investigated in this study. The modified Gompertz equation was fitted to accurately assess and compare the biogas and methane production from KW under the different pretreatment conditions and to attain representative simulations and predictions. In present study, COD solubilisation was demonstrated as an effective effect of pretreatment. Thermo-chemical pretreatments could improve biogas and methane production yields from KW. A comprehensive evaluation indicated that the thermo-chemical pretreatments (microwave irradiation and autoclave- assisted NaOH 5N, respectively) provided the best conditions to increase biogas and methane production from KW. The most effective enhancement of biogas and methane production (68.37 and 36.92 l, respectively) was observed from MW pretreated KW along with NaOH 5N, with the shortest lag phase of 1.79  day, the max. rate of 2.38 l·day<sup>–1</sup> and ultimate biogas production of 69.8 l as the modified Gompertz equation predicted.

scholarly journals In-Storage-Psychrophilic-Anaerobic-Digestion (ISPAD) process. Part I: Model Development and Calibration

2015 ◽  
Vol 4 (2) ◽  
pp. 165 ◽  
Author(s):  
Mahsa Madani Hosseini ◽  
Catherine N. Mulligan ◽  
Suzelle Barrington
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Model Development ◽  
Laboratory Data ◽  
Batch Process ◽  
Municipal Sludge ◽  
Batch Experiments ◽  
Fed Batch ◽  
Microbial Kinetics ◽  
Good Agreement

<p class="emsd">In-Storage-Psychrophilic-Anaerobic-Digestion (ISPAD) is a treatment system applicable to wastewaters stored for over 100 days, such as livestock wastes and municipal sludge. The ISPAD system differs from conventional reactors by being a sequentially fed batch process operating at a temperature fluctuating with ambient. The objective of this study was to develop a mathematical model to simulate the ISPAD process, verify the value of its microbial kinetics, and to simulate the pH evolution of its content along with its methane (CH<sub>4</sub>) production. Furthermore, the values of the ISPAD microbial kinetics were compared to that of previous years to track for further acclimation to psychrophilic conditions. Simulation of ISPAD was achieved using the Simulink/Matlab software. The model was calibrated using laboratory data obtained from batch experiments using 7-year-old ISPAD inoculum, and glucose as substrate, and where glucose, VFAs and pH changes were monitored along with biogas production. The ISPAD model showed good agreement with the experimental data representing the system behaviour between 4 and 35 ºC. Although microbial activity at 4 °C was much slower than that at 18 and 35 ºC, it showed acclimation to low temperatures. Furthermore, comparison of microbial kinetic values over 3 years of field ISPAD monitoring demonstrated continued population acclimation, especially for the methanogens.</p>

Collision–induced absorption in gaseous methane at low temperatures

1986 ◽  
Vol 64 (7) ◽  
pp. 763-767 ◽  
Author(s):  
I. R. Dagg ◽  
A. Anderson ◽  
S. Yan ◽  
W. Smith ◽  
C. G. Joslin ◽  
...  
Keyword(s):  
Experimental Data ◽  
Low Temperatures ◽  
Low Frequency ◽  
Frequency Region ◽  
Experimental Results ◽  
Published Data ◽  
Frequency Range ◽  
Simple Method ◽  
Induced Absorption ◽  
Good Agreement

A recently developed theory for collision-induced absorption in methane is compared with experimental results over a wider spectral range and at lower temperatures than previously reported. The present experimental results covering the frequency range below 400 cm−1 exhibit good agreement with other recently published data. The theory shows excellent agreement with experiment in the low-frequency region below approximately 200 cm−1 but underestimates the experimental data somewhat at higher frequencies. Possible theoretical reasons for this discrepancy are given. The theory represents a simple method of obtaining a good estimate of the collision-induced absorption spectra of methane in this frequency region and for extrapolating to lower temperatures for which experimentation is not feasible. In addition, the moments α1 and γ1are compared with earlier determinations and indicate good agreement with the previously obtained values for the octupole and hexadecapole moments of methane.

Mesophilic Anaerobic Digestion of Dairy Manure and Vegetable Waste Using Batch Reactor

2014 ◽  
Vol 1008-1009 ◽  
pp. 121-126
Author(s):  
Lin Jun Shi ◽  
Wen Lan Liu ◽  
Hui Fen Liu ◽  
Wei Yu Zhang ◽  
Li Tong Ban
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Batch Reactor ◽  
Theoretical Data ◽  
Gas Production ◽  
Dairy Manure ◽  
Experimental Results ◽  
Vegetable Waste ◽  
Start Up ◽  
Waste Mixture

Anaerobic digestion of single dairy manure, single vegetable waste, mixture of dairy manure and vegetable waste was conducted to produce biogas. Startup characteristic, leachate parameters and inoculation amount were investigated. The experimental results showed that anaerobic digestion can start up quickly with acclimated thickening sludge as inoculation sludge and 30% was appropriate inoculation percentage. Digestion of single dairy manure and mixture of dairy manure and vegetable waste appeared better buffering ability with higher alkalinity than single vegetable waste. Compared to single digestion of dairy manure or vegetable waste, mixture of dairy manure and vegetable waste is more suitable for anaerobic digestion. Under the conditions of TS=10% and T=(36±1)°C, cumulative biogas production of mixture of dairy manure and vegetable waste is 5281 mL during the period of 30 days and average daily gas production is about 176 mL. These results could provide theoretical data for practical biogas engineering.

scholarly journals Kinetic of Biogas Production in a Batch Anaerobic Digestion Process with Interference of Preservative Material of Sodium Benzoate

2020 ◽  
Vol 15 (3) ◽  
pp. 898-906
Author(s):  
Indro Sumantri ◽  
Hadiyanto Hadiyanto
Keyword(s):  
Anaerobic Digestion ◽  
Sodium Benzoate ◽  
Biogas Production ◽  
Batch Reactor ◽  
Suspended Solid ◽  
Organic Loading Rate ◽  
Order Kinetic ◽  
Kinetic Rate Constant ◽  
Food And Beverage ◽  
Synthetic Solution

Sodium benzoate is a preservative compounds which are widely used for both food and beverage products. The treatment of waste water containing this compound was normally conducted in a anaerobic digestion (AD) using a batch reactor system at a room temperature. The anaerobic process eventually produced biogas which can be used for bioenergy. This research was aimed to evaluate the production of biogas from by synthetic solution models containing sodium benzoate (SB). The experiment was performed in a variation of Mixed Liquor Suspended Solid (MLSS) of 4.8 and 7.2 g/L, and initial sodium benzoate concentration of 400, 600, and 800 mg/L. The digestion was performed at 60 days, while the biogas content was measured every 2 days. The results indicated a reduction in the cumulative biogas by the addition of sodium benzoate, compared to the control condition. Moreover, the decrease in organic loading rate (OLR) of SB in wastewater follows the first order kinetic with kinetic rate constant (k) was 0.0432 to 0.1254 (day−1) for MLSS of 4.8 g/L and 0.0276 to 0.0372 (day−1) for 7.2 g/L MLSS. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals In Situ Sonification of Anaerobic Digestion: Extended Evaluation of Performance in a Temperate Climate

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5349
Author(s):  
John Loughrin ◽  
Stacy Antle ◽  
Jason Simmons ◽  
Karamat Sistani ◽  
Nanh Lovanh
Keyword(s):  
Control System ◽  
Anaerobic Digestion ◽  
Biogas Production ◽  
Low Frequency ◽  
Sine Wave ◽  
Temperate Climate ◽  
Anaerobic Digesters ◽  
Environmental Consequences ◽  
The Cost ◽  
Wave Induced

Increasing the efficiency of anaerobic digesters and improving sludge breakdown is vital to reducing the cost of biogas production and reducing the environmental consequences of sludge disposal. The performance of two unheated anaerobic digestion systems, one exposed to sound at <20 kHz by waterproofed speakers and one acting as a control, were compared for over a year. The digester systems were both composed of primary (11.4 m3) and secondary (3.8 m3) anaerobic tanks, facultative tertiary (3.0 m3) tanks and an aerobic holding tank from which effluent was mixed with feed and recirculated back to the system. Exposure of the gas saturated digestate to a low frequency sine wave induced numerous bubble harmonics up to, and presumably beyond, ultrasonic range, showing that sonification of a highly gaseous liquid might be used to accomplish low power ultrasonication of digestate at greater distances than is possible with conventional ultrasonic technology. Through the summer of 2019, the sound-treated system produced 27% more biogas than the control system, and 74 times more during the winter when biogas production by the control systems essentially ceased. Afterwards, the control system produced more biogas due to depletion of volatile solids in the sound-treated digester. Results show that sound can be used for faster digester startup and substitute for a share of heating requirements during cool months.

A dispersion based model for anaerobic digestion of solid cattle wastes in a stratified thermophilic accumulation system

2005 ◽  
Vol 52 (1-2) ◽  
pp. 195-202 ◽  
Author(s):  
H.M. El-Mashad ◽  
W.K.P. van Loon ◽  
G. Zeeman ◽  
G.P.A. Bot ◽  
G. Lettinga
Keyword(s):  
Experimental Data ◽  
Anaerobic Digestion ◽  
Aspect Ratio ◽  
Dynamic Model ◽  
Model Validation ◽  
Methane Production ◽  
System Performance ◽  
Aspect Ratios ◽  
Accumulation System ◽  
Good Agreement

A dynamic model has been developed to describe the anaerobic digestion of solid cattle waste in an accumulation system (AC). To calibrate the model an experiment was carried out at a lab-scale AC at 50 °C. The predicted methane production shows a very good agreement (i.e. R2=0.998) with the experimental data. However less agreement is evident for the intermediates. After model validation the model was applied to study the effect of different aspect ratios on the system performance. An optimum aspect ratio of 2–3 could be determined.

Dynamics and acoustics of polydisperse gas-droplet and bubbling media. Theory and experiment

2017 ◽  
Vol 12 (1) ◽  
pp. 67-72
Author(s):  
D.A. Gubaidullin
Keyword(s):  
Experimental Data ◽  
Nonlinear Oscillations ◽  
Experimental Studies ◽  
Low Frequency ◽  
Arbitrary Distribution ◽  
Transient Wave ◽  
Wave Dynamics ◽  
Resonance Character ◽  
Dynamics Of Particles ◽  
Good Agreement

The results of theoretical and experimental studies of wave dynamics and acoustics of gas-droplet and bubbling media are presented. The propagation of weak waves in the vapor-gas polydisperse media (with an arbitrary distribution function of the size of inclusions) and discrete multifraction droplet and bubbling media with phase transformations is studied. Mathematical models have been developed, dispersion relations have been obtained, high- and low-frequency asymptotics of the damping coefficient have been studied, and the areas of applicability of the developed theories are discussed. Good agreement of the presented results with the published experimental data by other authors is shown. The nonlinear oscillations of gas suspensions and the dynamics of particles in tubes in the shock and shockless regimes as well as in the transient wave one have been experimentally studied. The resonance character of the droplet deposition with the oscillation frequency and the possibility of effective acoustic deposition of the most problematic submicron drops are shown. Based on the fast Fourier transform algorithms, the acoustic signal distortion during the diagnostics of a multilayer sample containing a liquid layer with polydisperse bubbles has been calculated. Good agreement between the theoretical and experimental data has been obtained.

Experimental and Modelling Approach of Biogas Production by Anaerobic Digestion of Agricultural Resources

2017 ◽  
Vol 68 (6) ◽  
pp. 1294-1297 ◽  
Author(s):  
Gabriela Alina Dumitrel ◽  
Adrian Eugen Cioabla ◽  
Ioana Ionel ◽  
Lucia Ana Varga
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Biogas Production ◽  
Batch Reactor ◽  
Pilot Scale ◽  
Lag Phase ◽  
Biogas Yield ◽  
Agricultural Resources ◽  
Methane Production Rate ◽  
Modelling Approach

Anaerobic digestion processes of agricultural resources, as single substrates (wheat bran and barley) or as combination of substrates (75 % corn&25% corn cob � named MIX1 and 40 % corn & 40 % wheat&20 % sunflower husks � named MIX2), were performed, at a mesophilic temperature in a batch reactor, at pilot scale. The results proved that the higher quantity of biogas yield was achieved for barley, followed by MIX1, and finally MIX2. The same order was obtained when the total methane production was evaluated. The performances of digesters were mathematically evaluated by using the modified Gompertz equation. The kinetic parameters, such as the methane production potential (MP), the maximum methane production rate (Rm) and the extent of lag phase (l) were calculated, for each experimental case. The values of the performance indicators confirmed that all the models fitted well with the experimental data.

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