scholarly journals Prediction of biogas production rate from dry anaerobic digestion of food waste: Process-based approach vs. recurrent neural network black-box model

2021 ◽  
Vol 341 ◽  
pp. 125829
Author(s):  
Kyu Won Seo ◽  
Jangwon Seo ◽  
Kyungil Kim ◽  
Seung Ji Lim ◽  
Jaeshik Chung
Keyword(s):  
Neural Network ◽  
Anaerobic Digestion ◽  
Production Rate ◽  
Recurrent Neural Network ◽  
Food Waste ◽  
Biogas Production ◽  
Black Box ◽  
Box Model ◽  
Dry Anaerobic Digestion ◽  
Biogas Production Rate

scholarly journals Anaerobic Digestion of Cassava (Manihot Esculenta) Waste: Effects of Inoculum on Biogas Production Rate

2020 ◽  
Vol 4 (2) ◽  
pp. 411-420
Author(s):  
B.E. Eboibi ◽  
K.O. Adiotomre ◽  
F. Onobrudu ◽  
E. Osioh
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Manihot Esculenta ◽  
Decay Constant ◽  
Biogas Production ◽  
Cow Manure ◽  
Anaerobic Digesters ◽  
First Order ◽  
Cassava Peel ◽  
Biogas Production Rate

In this paper, cow manure fluid was used as inoculums to investigate biogas production rate from anaerobic digestion of cassava peel at mesophilic temperature (280C). The anaerobic experiment was conducted using six batch digesters (D1, D2, D3, D4, D5 and D6) each of 20L capacity for 40-day hydraulic retention. Each digester, was loaded with 5kg of cassava peel (CP) and 0%, 10%, 20%, 30%, 40% and 50% of inoculum to CP. Hashimoto model was used to obtain the digestion kinetic parameters. The results of the study showed that inoculums influenced the rate of biogas production, showing variations in biogas production, correlation coefficient (R2) and in first-order decay constant (k). The average cumulative biogas production was in the range of ~2358 to 4010ml/kgVS for 10% to 50% inoculum. The R2 and k for D1 was 0.959 and 0.359 D1 (without inoculum), 0.990 and 0.371 for D2 (10% inoculum) and 0.991 and 0.371 for D3 (20% inoculum), 0.951 and 0.356 for D4 (30% inoculum), 0.992 and 0.372 for D5 (40% inoculum), and 0.990 and 0.371 was obtained for D6 loaded with 50% inoculum. Despite variation in biogas yields from different inoculums, biogas production obtained from anaerobic digesters loaded with inoculums were still lower compared with that without inoculum.

Effect of Oil Content on Dry Anaerobic Digestion of Food Waste under Mesophilic Conditions

2015 ◽  
Vol 768 ◽  
pp. 281-288
Author(s):  
Lian Hai Ren ◽  
Yan Bing Huang ◽  
Pan Wang
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Oil Content ◽  
Continuous Fermentation ◽  
Biogas Production ◽  
Removal Rate ◽  
Gas Production ◽  
Composition Analysis ◽  
Volatile Solids ◽  
Dry Anaerobic Digestion

The variations of daily biogas yields, cumulative biogas yields, biogas composition analysis, total solids (TS) and volatile solids (VS) were studied in the process of mesophilic and dry anaerobic digestion of food waste under different oil contents (0%, 2%, 4%, 6%, 8%, 10%) at 35 °C. The gas production raised and then went down with the oil content, followed by 243.14, 245.64, 256.09, 269.25, 276.54, 284.22mL /g TS respectively. The research provided a reference for the pretreatment of food waste in follow-up continuous fermentation. Results showed that the period of the process of mesophilic dry anaerobic digestion under oil content of 0% was the shortest, with the total biogas production of 1275.5mL. During the process of the digestion, methane content of the biogas raised and then went down, up to a maximum of 77.62%. The removal rate of TS and VS in food waste with the oil content of 6% was the highest, obtained as 11.2% and 13.2%, respectively.

scholarly journals EFFECT OF ORGANIC LOADING RATE ON THE PERFORMANCE OF ANAEROBIC CO-DIGESTION DIGESTER TREATING FOOD WASTE AND SLUDGE WASTE

2018 ◽  
Vol 56 (2A) ◽  
pp. 37-42
Author(s):  
Dinh Thi Nga
Keyword(s):  
Production Rate ◽  
Food Waste ◽  
Loading Rate ◽  
Biogas Production ◽  
Methane Yield ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Working Volume ◽  
Sludge Waste ◽  
Biogas Production Rate

This research was carried out to evaluate the effect of organic loading rate to the performance of anaerobic co-digestion digester treating organic fraction of food waste (FW) and sludge waste (SW) from wastewater treatment plant. The experiment was conducted in two runs: Run S50, substrate contained 50 % of FW and 50 % of SW in term of volatile solid (VS) concentration; Run S100 (control run) contained 100 % SW in the influent substrate. The experiment was performed in a 3L working volume reactor at ambient temperature with three levels of organic loading rate (OLR) as 2; 4; 6 kgVS/m3/day, the duration of experiment was 18 days for each level of OLR. As results, the average of biogas production rate (BPR) at OLR 2;4;6 kgVS/m3/day,in Run S50 and Run S100 was 390 – 520;  860 – 1220; 1140 - 2440 ml/day and 160 – 300; 560 – 640; 700 - 1400 ml/day, respectively. The maximum methane yield (mlCH4/gVSadded/day) of organic loading rate 2; 4; 6 kgVS/m3/day was 118.96; 326.49; 628.20 for Run S50 and; 58.28; 160.27; 255.54 for Run S100, respectively. In conclusion, Run S50 always produced higher biogas production rate and higher methane yield at all 3 OLR levels. The higer OLR could enhance BPR and methane yield but at OLR 6 kgVS/m3/day made unstable performance and high concentration of COD in the effluent. Therefore, in this experimental conditions it has better operation at OLR under 6 kgVS/m3/day for the stable performance of reactors.

scholarly journals Effects of Pretreatment and Ratio of Solid Sago Waste to Rumen on Biogas Production through Solid-State Anaerobic Digestion

2021 ◽  
Vol 13 (13) ◽  
pp. 7491
Author(s):  
Siswo Sumardiono ◽  
Gebyar Adisukmo ◽  
Muthia Hanif ◽  
Budiyono Budiyono ◽  
Heri Cahyono
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Microbial Consortium ◽  
Biogas Production ◽  
Biological Pretreatment ◽  
Metabolic Balance ◽  
Digestion Process ◽  
Potential Source ◽  
Sago Waste ◽  
Biogas Production Rate

Solid sago waste is a potential source of producing renewable energy in the form of biogas. This study investigated the effects of solid sago waste particle size, biological pretreatment using a microbial consortium of lignocelluloses, pretreatment with NaOH, and the ratio between solid sago waste and cow rumen based on the biogas production rate. Several variations of these conditions were used to achieve this. The anaerobic digestion process was conducted over two months at 30.42 °C ± 0.05 °C, and the biogas production rate was measured every two days. The 1:1 ratio showed better results compared to the 2:1, because it allows the bacteria to achieve metabolic balance. The highest cumulative biogas production (27.91 mL/g TS) was generated when the sago waste underwent milling (±1 mm), pretreatment with 4% NaOH g/g TS, and treatment with microbial consortium 5% v/v at a 1:1 ratio of solid sago waste to the rumen.

scholarly journals Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1960 ◽  
Author(s):  
Pei Guo ◽  
Jiri Zhou ◽  
Rongjiang Ma ◽  
Nanyang Yu ◽  
Yanping Yuan
Keyword(s):  
Heat Transfer ◽  
Anaerobic Digestion ◽  
Multiphase Flow ◽  
Production Rate ◽  
Transfer Rate ◽  
Field Experiments ◽  
Heat Transfer Performance ◽  
Biogas Production ◽  
Transfer Performance ◽  
Biogas Production Rate

Traditional static anaerobic digestion technology presents the disadvantages of a low gas production rate and long digestion cycle, which is not conducive to the treatment of livestock manure. A 12 m3 multiphase flow anaerobic digester (MFD) was developed in this study to improve the biogas production rate and maintain constant temperature digestion during winters. Full-scale field experiments were conducted on the biogas production rate at different temperatures, the dynamic digestion effects, and the dynamic heating digestion effects of the system at Sichuan, China. A comparison of the dynamic and static digestion results of 50 days indicated that the biogas production for the dynamic digestion (DD) group was 115.22 m3 or 127.1% higher than that of the static digestion (SD) group with the same digestion temperature. The results of the heat transfer performance experiment revealed that the heat transfer rate of the system increased significantly, and the temperature of the biogas slurry increased rapidly. The optimization analysis of the system was based on the experimental results of the relationship between the slurry temperature and biogas production rate, and the economical digestion temperature of the system was proposed and calculated. Different insulation materials or insulation thicknesses have an influence on the economical digestion temperature. Additionally, the economical digestion temperature of the system in which the polystyrene insulation layer with a thickness of 90 mm was used, was found to be 27.2 °C. When digestion temperature was 22.3 °C, the energy efficiency ratio (EER) of dynamic anaerobic digestion system is 1. The advantages of MFD are low biogas production unit cost and high heat and mass transfer rate. However, the disadvantage of high operation energy consumption needs further improvement. And additional energy was required when system digestion temperature below 22.3 °C. The proposed MFD and dynamic anaerobic digestion system can play a significant role in using biomass resources and promoting the development of biogas projects.

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