Effect of Substrate to Inoculum Ratio on Bioenergy Recovery from Food Waste, Yard Waste, and Biosolids by High Solids Anaerobic Digestion

Dixon, Phillip; Ergas, Sarina J.; Mihelcic, James R.; Hobbs, Shakira R.

doi:10.1089/ees.2019.0078

Cited by 20 publications

(6 citation statements)

References 38 publications

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“…The study observed an inverse relationship between pH and ISR in the AD system, which was also mentioned in the analytical study on the effect of inoculum to substrate ratio in the AD system ( Dixon et al., 2019 ).…”

Section: Resultssupporting

confidence: 53%

Bio methane potential of sludge from municipal sewer and exchange stations

Selamawit

Agizew

2022

Heliyon

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Technologies with resource recovery alternatives are suggested in metropolitan settings. Anaerobic digesters (AD) are the most common. The use of microcrystalline cellulose and a variety of grocery products as control feed increases the cost of bio methane potential analysis (BMP). This limits its replication, especially in developing countries. As a result, this study looks into the use of milled paper as a control feed during BMP analysis of sludge from sewer and exchange stations. A batch experimental study at 37 °C with hydraulic retention times of 23 and 24 days for exchange station and sewage sludge, respectively, was established for the assessment. The pH of the sewage sludge was acidic during the analysis. To avoid underestimating the total (TS) and volatile solid (VS) ratios, the VS should indeed be determined through temperature or pH adjustment. As a result, the preceding alternative was implemented in this work. According to the findings of the online biogas application, the blank (milled paper) accurately keeps the required validation standards. Furthermore, the gas production potential of sludge from the exchange station (ES) and the sewage line (SS) is 2.4 and 1.6 NL/gVs, respectively. The generated gas has an electric potential of 8.81 and 3.35 KWH for ESS and SS, respectively. Interestingly, the calorific values of the investigated substrates were also nearly equivalent. In brief, using milled paper as a control feed in BMP analysis reduces laboratory costs and encourages BMP test repetition, which is especially important in developing countries. This advances research on the use of AD in the search for alternative energy sources.

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Section: Resultssupporting

confidence: 53%

Bio methane potential of sludge from municipal sewer and exchange stations

Selamawit

Agizew

2022

Heliyon

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“…Referring to the German Standard VDI4630, the I•S −1 ratio should be adjusted to more than two [33]. Other studies have discovered that a higher I•S −1 ratio generates more biogas on a consistent basis during the AD process, while a lower I•S −1 ratio produces less biogas due to the lower pH and accumulation of volatile fatty acids (VFAs) [34,35]. In this study, the I•S −1 ratio maintained at approximately 3.0, which indicates that 1 mL of substrate was added for every 3 mL of inoculum.…”

Section: Inoculum and Substratesmentioning

confidence: 99%

Effects of Stepwise Temperature Shifts in Anaerobic Digestion for Treating Municipal Wastewater Sludge: A Genomic Study

Sudiartha

Imai

Hung

2022

IJERPH

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In wastewater treatment plants (WWTP), anaerobic digester (AD) units are commonly operated under mesophilic and thermophilic conditions. In some cases, during the dry season, maintaining a stable temperature in the digester requires additional power to operate a conditioning system. Without proper conditioning systems, methanogens are vulnerable to temperature shifts. This study investigated the effects of temperature shifts on CH4 gas production and microbial diversity during anaerobic digestion of anaerobic sewage sludge using a metagenomic approach. The research was conducted in lab-scale AD under stepwise upshifted temperature from 42 to 48 °C. The results showed that significant methanogen population reduction during the temperature shift affected the CH4 production. With 70 days of incubation each, CH4 production decreased from 4.55 L·g−1- chemical oxygen demand (COD) at 42 °C with methanogen/total population (M·TP−1) ratio of 0.041 to 1.52 L·g−1 COD (M·TP−1 ratio 0.027) and then to 0.94 L·g−1 COD ( M·TP−1 ratio 0.026) after the temperature was shifted to 45 °C and 48 °C, respectively. Methanosaeta was the most prevalent methanogen during the thermal change. This finding suggests that the Methanosaeta genus was a thermotolerant archaea. Anaerobaculum, Fervidobacterium, and Tepidanaerobacter were bacterial genera and grew well in shifted-up temperatures, implying heat-resistant characteristics.

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“…Food waste (FW) constitutes the main fraction of municipal solid waste (MSW) [31]. The amount of food waste produced globally has reached more than 1.3 billion tons annually [32][33][34], and most of this is disposed of in land lls [35][36][37]. Because FW is readily degradable, it leads to emissions of a signi cant amount of greenhouse gases, most notably methane, from land ll sites [8,38,39].…”

Section: Introductionmentioning

confidence: 99%

Influence of inoculum to substrate ratio and substrates mixing ratio on biogas production from the anaerobic co-digestion of Phragmites australis and food waste

Al-Iraqi

Semple

Folkard

et al. 2023

Preprint

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This study focused on determining the effect of the inoculum to substrate ratio (ISR) on biogas production efficiency from the anaerobic co-digestion of two substrates: simulated food waste (SFW) and common reeds (Phragmites australis) that were ground and pre-treated using sodium hydroxide at a concentration of 2% to increase access to their cellulose. It also studied the role of different mixing ratios of the two substrates in improving the stability of the digestion process and increasing biogas production. A series of batch tests were carried out under mesophilic conditions using three ratios of ISR: 1:4, 1:2, and 1:1, and five substrate mixing ratios (SFW: pre-treated P. australis): 25:75, 50:50, 75:25, 100:0, and 0:100. The results showed low biogas production at the ISR 1:4, and the reactors suffered from acidification and instability at the different substrates mixing ratios. While the biogas production increased at an ISR of 1:2, where the reactors with the substrate mixing ratio of 75:25 presented the highest biogas production, and the digestion process was stable. However, the reactors with substrate mixing ratios of 50:50, 75:25 and 100:0 suffered from acidification effects at this ISR. In contrast, at ISR of 1:1, the reactors did not expose to acidification inhibition at all the substrates mixing ratios, and the highest biogas production was found at SFW: pre-treated P. australis mixing ratios of 75:25 and 100:0.

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Effect of Substrate to Inoculum Ratio on Bioenergy Recovery from Food Waste, Yard Waste, and Biosolids by High Solids Anaerobic Digestion

Cited by 20 publications

References 38 publications

Bio methane potential of sludge from municipal sewer and exchange stations

Bio methane potential of sludge from municipal sewer and exchange stations

Effects of Stepwise Temperature Shifts in Anaerobic Digestion for Treating Municipal Wastewater Sludge: A Genomic Study

Influence of inoculum to substrate ratio and substrates mixing ratio on biogas production from the anaerobic co-digestion of Phragmites australis and food waste

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