The effectiveness of anaerobic digestion process by thermal pre-treatment on food waste as a substrate

Saragih, Farah Nurul Anisa; Priadi, Cindy Rianti; Adityosulindro, Sandyanto; Abdillah, Ayik; Islami, Brilyana Bela

doi:10.1088/1755-1315/251/1/012014

Cited by 15 publications

(17 citation statements)

References 18 publications

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“…They further decreased to 187.1 g L −1 and 162.1 g L −1 for the solid fraction and 8.6 g L −1 and 5.4 g L −1 for the liquid fraction. A similar decrease in the TS and VS values after the SE pretreatment was observed [36]. The TS in the effluent on day 0 and day 98 was 28.50 g L −1 and 20.50 g L −1 , respectively.…”

Section: Mass Balance and Chemical Composition Of The Untreated And Pretreated Substrate And Effluentsupporting

confidence: 79%

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

et al. 2021

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In this study, semi-continuous anaerobic digestion of lignin-rich steam-exploded Ludwigia grandiflora (Lignin = 25.22% ± 4.6% total solids) was performed to understand better the effect of steam explosion on the substrate solubilisation and inhibitors formation during the process. Steam explosion pretreatment was performed at 180 °C for 30 min at a severity factor of 3.8 to enhance the biogas yield of the lignocellulosic biomass. The semi-continuous anaerobic digestion was performed in a continuously stirred tank reactor for 98 days at an initial hydraulic retention time of 30 days and an organic loading rate of 0.9 g-VS L−1day−1. The performed steam explosion pretreatment caused biomass solubilisation, resulting in enhanced biogas production during the process. During the anaerobic digestion process, the average biogas yield was 265 mL g-VS−1, and the pH throughout the operation was in the optimum range of 6.5–8.2. Due to fluctuations in the biogas yield, the hydraulic retention time and organic loading rate were changed on day 42 (50 days and 0.5 g-VS L−1day−1) and on day 49 (40 days and 0.7 g-VS L−1day−1), and 1 M of NaOH was added to the liquid fraction of the steam-exploded L. grandiflora during the latter part of the operation to maintain the stability in the reactor. Therefore, the steam explosion pretreatment helped in the degradation of L. grandiflora by breaking the lignocellulose structure. In addition, changes in the operating conditions of the anaerobic digestion led to an increase in the biogas production towards the end of the process, leading to the stability in the CSTR.

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Section: Mass Balance and Chemical Composition Of The Untreated And Pretreated Substrate And Effluentsupporting

confidence: 79%

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

et al. 2021

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“…Reduced COD levels in anaerobic digestion indicate that materials other than acids can be degraded because organic acids in the liquid phase increase COD [31]. The substrate residence time According to research conducted by Saragih et al, the solubility decreased as the percentage of TS increased, which affected the solid substrate's mass transfer, such that the higher the solubility, the better the microbes' ability to degrade the COD [30]. Reduced COD levels in anaerobic digestion indicate that materials other than acids can be degraded because organic acids in the liquid phase increase COD [31].…”

Section: Cod Reductionmentioning

confidence: 99%

Biogas Production from Coffee Pulp and Chicken Feathers Using Liquid- and Solid-State Anaerobic Digestions

et al. 2021

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Agricultural waste, particularly lignocellulose, has been used in the second generation of biogas. Coffee pulp and chicken feathers can be developed as biogas raw materials because of their suitability as a biogas substrate. This study investigates the effect of the percentage of total solids (TS), carbon to nitrogen ratio (C/N, g/g), and delignification pretreatment on biogas production from coffee pulp and chicken feathers, and aims to compose kinetics using the modified Gompertz model. The results show that adjusting the percentage of TS at low-level speeds up the degradation process, which increases chemical oxygen demand (COD) reduction and biogas production. COD reduction and biogas production increase optimally at the 25 (g/g) C/N ratio. Pretreatment delignification aids microorganisms in substrate decomposition, resulting in faster COD reduction and biogas conversion. The 25% TS and 25 (g/g) C/N ratio with the delignification process achieved the best biogas production, with biogas production of 10,438.04 mL. The Gompertz method shows that the difference in TS percentage can influence biogas production. Moreover, the method shows that biogas production is higher with the delignification process than without it.

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“…The pH of the in uent was measured at 7.2, which is within the anaerobic digestion process's permitted range. According to Saragih et al, [23], the ideal pH range for anaerobic digestion is between 7 and 8.5. In addition the pH of mixture ranging from 6.8-7.4 is also acceptable [13,44].…”

Section: 2characteristics Of In Uentmentioning

confidence: 99%

“…Next, the food waste was diluted with tap water with a ratio of 1:2 (food waste: tap water) [22]. After the dilution process, the food waste was mixed and disintegrated using a kitchen blender [23].…”

Section: 1substrate and Inoculummentioning

confidence: 99%

Pilot-scale Anaerobic Digestion of Food Waste: Evaluation on the Stability, Methane Production, and Kinetic Analysis

Fadzil

Norazman

et al. 2021

Preprint

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Food waste was massively disposed at landfills daily, and this method is no longer effective in managing waste due to the limited space and environmental issues. An alternative solution was explored in managing the food waste, and anaerobic digestion serve as the best solution. Food waste was digested anaerobically in a lab-scale and pilot-scale anaerobic digester. The performance of a batch pilot-scale anaerobic digestion of food waste, on the other hand, is less documented. The goal of this research is to look into a batch pilot-scale anaerobic digester for food waste, with a focus on methane potential and kinetic studies. A single-stage anaerobic digestion of food waste was carried out with an inoculum to substrate ratio (I/S) of 2.0. A variety of tests were carried out to identify the properties of the food waste and the inoculum employed. Effluent was collected daily for the monitoring process. The pH and volatile fatty acid to total alkalinity ratio (VFA/TA) were monitored daily to ensure that the anaerobic digestion process remained stable. The VFA/TA ratio suggested that the anaerobic digestion process was stable throughout the anaerobic digestion process. The methane accumulation for 26 days monitoring is 463250 mL. The ultimate methane yield of 5103.6 mL CH4/gVS was observed. The maximum removal efficiency for TS, VS, and COD in this investigation was 85.32, 94.15, and 93.52 %, showing that food waste was efficiently decomposed for biomethane conversion. The Modified Gompertz (GM) and Logistic function models were used to conduct the kinetic analysis. The results reveal that the GM model provides a higher R2 value than the logistic function model, thus the GM model is more suited in explaining the performance of the anaerobic digestion process.

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The effectiveness of anaerobic digestion process by thermal pre-treatment on food waste as a substrate

Cited by 15 publications

References 18 publications

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

Effect of Semi-Continuous Anaerobic Digestion on the Substrate Solubilisation of Lignin-Rich Steam-Exploded Ludwigia grandiflora

Biogas Production from Coffee Pulp and Chicken Feathers Using Liquid- and Solid-State Anaerobic Digestions

Pilot-scale Anaerobic Digestion of Food Waste: Evaluation on the Stability, Methane Production, and Kinetic Analysis

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