Enhancing the energetic potential of Mediterranean food waste by anaerobic co‐digestion with sewage sludge

Hamrouni, Yosra M. B.; Cheikh, Ridha Ben

doi:10.1002/ep.13512

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…As far as the 3/1 ratio is concerned (447 ml/g VS), [39] research reported a lower speci c production of 246 ml/g VS, which might be explained by SARS-CoV 2 presence in the feed. In studies [40] and [41] whose results are in opposite areas of very unlikely observations (with productions of 175 and 744 ml/g VS, respectively), no additions were made.…”

Section: Resultsmentioning

confidence: 98%

Characteristics of biogas production and synergistic effect of primary sludge and food waste co-digestion

Rakić

Šušteršič

Gordić

et al. 2023

Preprint

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Co-digestion implementation in wastewater treatment plants reduces waste output and enhances biogas yield. In this regard, the objective of this research was to determine the optimal ratio of biodegradable waste and sewage sludge for co-digestion process in a city plant in central Serbia. The increase in biogas production was investigated through batch tests while synergistic effects were evaluated by chemical oxygen demand (COD) balance. Analyses were performed in four volume basis ratios (3/1, 1/1, 1/3, 1/0) of primary sludge and food waste with added low food waste: 3.375%, 4.675%, and 5.35%, respectively. The best proportion was found to be 1/3 with the highest biogas production (618.7 ml/g VS added) and the organic removal of 52.8% COD elimination. COD reductions further supported the synergistic impact; specifically, an additional 7.1%, 12.8%, and 17% of COD were converted into biogas during the co-digestions 1, 2, and 3, respectively. The rise in co-substrate concentrations was accompanied by a uniform hydrolysis rate constant, the absence of any lag phase, and a greater biogas generation rate. The amount of biogas produced within co-digestions proves to be equivalent to the volume of biogas acquired from individual substrates and the mass of added COD in co-digestions but inversely proportional to the mass of COD utilized in mono-digestion. Further on, specific biogas productions and COD values in digesters show linear dependence. Finally, the study points out that COD method can be used for developing relatively accurate model for biogas potential estimation in wastewater treatment plants.

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Section: Resultsmentioning

confidence: 98%

Characteristics of biogas production and synergistic effect of primary sludge and food waste co-digestion

Rakić

Šušteršič

Gordić

et al. 2023

Preprint

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“…In another study on the AcoD of FVW with the SS, the measured CMP was 119 mL/gVS in the monodigestion of primary sludge [ 21 ]. Similarly, the CMPs were determined to be 133 and 190 mL/gVS for SS consisting of primary sludge and waste-activated sludge in studies performed to determine a suitable mixing ratio for the AcoD of SS with food waste [ 22 , 31 ]. The values for the CMP of SS reported in the above-mentioned studies are quite similar to the CMPs obtained in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…In the AcoD, it is very important to determine the most suitable cosubstrates and mixing ratio to maximize methane production with a synergistic effect and prevent the production of inhibitory components that can cause an antagonistic effect [ 17 , 19 ]. Sewage sludge, known to have a high nitrogen content, has been preferred as a cosubstrate to provide the optimum C/N ratio in the anaerobic digestion of agricultural wastes with a high carbon content [ 20 , 21 , 22 ]. Codigestion of agricultural wastes with sewage sludge (SS) can increase biogas production by (i) maintaining an optimal pH for bacteria, (ii) decreasing free ammonia/ammonium inhibition and (iii) providing a better C/N ratio during anaerobic digestion [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste?

et al. 2021

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Pretreatment and codigestion are proven to be effective strategies for the enhancement of the anaerobic digestion of lignocellulosic residues. The purpose of this study is to evaluate the effects of pretreatment and codigestion on methane production and the hydrolysis rate in the anaerobic digestion of agricultural wastes (AWs). Thermal and different thermochemical pretreatments were applied on AWs. Sewage sludge (SS) was selected as a cosubstrate. Biochemical methane potential tests were performed by mixing SS with raw and pretreated AWs at different mixing ratios. Hydrolysis rates were estimated by the best fit obtained with the first-order kinetic model. As a result of the experimental and kinetic studies, the best strategy was determined to be thermochemical pretreatment with sodium hydroxide (NaOH). This strategy resulted in a maximum enhancement in the anaerobic digestion of AWs, a 56% increase in methane production, an 81.90% increase in the hydrolysis rate and a 79.63% decrease in the technical digestion time compared to raw AWs. On the other hand, anaerobic codigestion (AcoD) with SS was determined to be ineffective when it came to the enhancement of methane production and the hydrolysis rate. The most suitable mixing ratio was determined to be 80:20 (Aws/SS) for the AcoD of the studied AWs with SS in order to obtain the highest possible methane production without any antagonistic effect.

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“…Assuming an average collection and transportation distance of 100 km, then each ton of kitchen waste collection and transportation process would require 4 L of diesel. At a diesel density of 0.84 g/cm 3 , the diesel consumption for this transportation process was ~3.36 kg. (2) Production of biogas through pretreatment and co-digestion processes: The processing scale was 150 t/day.…”

Section: Environmental Impact Assessment Of Anaerobic Co-digestion Of...mentioning

confidence: 99%

“…Anaerobic co-digestion treatment technology refers to the method of anaerobic digestion treatment of two or more organic wastes at the same time according to the characteristics of different biomass wastes. Several studies have examined the anaerobic co-digestion of kitchen waste and residual sludge to balance the nutrient ratio of the substrate [2], which results in complementary effects and improves gas production efficiency [3,4]. Pan Y et al investigated the synergistic effect and biodegradation kinetics of residual sludge and kitchen waste in the anaerobic co-digestion process.…”

Section: Introductionmentioning

confidence: 99%

Study on the Environmental Impact and Benefits of Incorporating Humus Composites in Anaerobic Co-Digestion Treatment

Zhao,

Wei,

Bai

et al. 2024

Toxics

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This study evaluated the environmental impact and overall benefits of incorporating humus composites in the anaerobic co-digestion of kitchen waste and residual sludge. The life cycle assessment method was used to quantitatively analyze the environmental impact of the entire anaerobic co-digestion treatment process of waste, including garbage collection, transportation, and final product utilization. Moreover, the comprehensive assessment of the environmental impact, energy-saving and emission-reduction abilities, and economic cost of using humus composites in the anaerobic co-digestion treatment process was conducted using a benefit analysis method. The results showed that the anaerobic co-digestion of kitchen waste and residual sludge significantly contributed to the mitigation of global warming potential (GWP), reaching −19.76 kgCO2-eq, but had the least impact on the mitigation of acidification potential (AP), reaching −0.10 kgSO2-eq. In addition, the addition of humus composites significantly increased the production of biogas. At a concentration of 5 g/L, the biogas yield of the anaerobic co-digestion process was 70.76 m3, which increased by 50.62% compared with the blank group. This amount of biogas replaces ~50.52 kg of standard coal, reducing CO2 emissions by 13.74 kg compared with burning the same amount of standard coal. Therefore, the anaerobic co-digestion treatment of kitchen waste and residual sludge brings considerable environmental benefits.

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Enhancing the energetic potential of Mediterranean food waste by anaerobic co‐digestion with sewage sludge

Cited by 9 publications

References 34 publications

Characteristics of biogas production and synergistic effect of primary sludge and food waste co-digestion

Characteristics of biogas production and synergistic effect of primary sludge and food waste co-digestion

Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste?

Study on the Environmental Impact and Benefits of Incorporating Humus Composites in Anaerobic Co-Digestion Treatment

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