The effect of the labile organic fraction in food waste and the substrate/inoculum ratio on anaerobic digestion for a reliable methane yield

Kawai, Masahiro; Nagao, Norio; Tajima, Nobuaki; Niwa, Chiaki; Matsuyama, Tatsushi; Toda, Tatsuki

doi:10.1016/j.biortech.2014.01.018

Cited by 139 publications

(69 citation statements)

References 31 publications

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“…This could be confirmed by the maximum daily methane production of mono-FW on day 1, while mono-SS on days 1-8. The least biogas production of mono-FW maybe due to the acidification as previously suggested (Kawai et al, 2014), while the cumulative methane yields of mono-SS were comparable to previous study in which the hydrolysis was considered as the rate-limited step for anaerobic digestion of SS (Liu et al, 2015). The advantage of anaerobic co-digestion of FW and SS has been generally confirmed (Duan et al, 2012).…”

Section: Effects Of Mw On Anaerobic Co-digestion Of Fw and Sssupporting

confidence: 67%

“…AD is preferred as an efficient pathway for treatment of FW due to its high organic contents and excellent biodegradability (Zhang et al, 2007). Nevertheless, the accumulation of volatile fatty acids (VFAs) occurred frequently due to the labile organic fraction which was hydrolyzed too fast, and this may lead to process failure due to the acidification of AD (Kawai et al, 2014;Yong et al, 2015). Thus, the anaerobic codigestion of FW and SS became increasingly popular, with the advantage of adjusting the C/N ratio, increasing the methane yields, diluting harmful substances, and also mediating the hydrolysis of FW and SS (Kawai et al, 2014;Lee et al, 2009;Yong et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the accumulation of volatile fatty acids (VFAs) occurred frequently due to the labile organic fraction which was hydrolyzed too fast, and this may lead to process failure due to the acidification of AD (Kawai et al, 2014;Yong et al, 2015). Thus, the anaerobic codigestion of FW and SS became increasingly popular, with the advantage of adjusting the C/N ratio, increasing the methane yields, diluting harmful substances, and also mediating the hydrolysis of FW and SS (Kawai et al, 2014;Lee et al, 2009;Yong et al, 2015). Cell wall disruption or destruction is considered as an effective way of enhancing AD efficiency of SS which is mainly composed of microbial cells within an extra-cellular polymeric floc matrix (Baier and Schmidheiny, 1997), because hydrolysis was enhanced through SS pretreatment by releasing the intracellular organics that were easily biodegraded.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Zhang

Tong

et al. 2016

Bioresource Technology

209

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Section: Effects Of Mw On Anaerobic Co-digestion Of Fw and Sssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Zhang

Tong

et al. 2016

Bioresource Technology

209

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“…У роботі [9] досліджено ви-хід біогазу при анаеробному зброджуванні хар-чових відходів за співвідношення субстрату до інокуляту: 0,33:1; 0,5:1; 1:1; 2:1; 4:1 г/г. Найбіль-ший вихід біогазу отримали за співвідношення 0,33:1, в інших варіантах вихід був нижчим на 38-73 % [9]. Актуальним є визначення співвід-ношення субстрату й інокуляту за умови попе-редньої обробки сировини лугом.…”

Section: вступunclassified

Hydrogen Production During Аnaerobic Fermentation of Corn and Sunflower Waste

Golub¹,

Drapoi²

2016

НВ НТУУ КПІ

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Background. Obtaining hydrogen -an alternative energy carrier -from renewable resources (agricultural waste). Objective. Establish rational parameters for alkaline pretreatment of sunflower and corn waste by an association of microorganisms to increase the speed of hydrogen production. Methods. We used gas chromatography method to establish the qualitative and quantitative biogas content that was produced during the process of fermentation. We used light microscopy methods to determine lysis zones and to monitor species content of microorganisms association. Results. We've investigated the effect of 5, 10, 20, 30, 40 % alkali concentration during pretreatment of corn and sunflower waste on hydrogen yield in the process of their anaerobic fermentation for 1, 2 and 3 hours. The highest hydrogen yield has been achieved by pretreatment with 20 % NaOH solution for 3 hours. We've studied the hydrogen yield during fermentation process with inoculum to culture medium ratio as: 1:6; 1:3; 1:2; 2:3; 1:1 by volume. The content of microorganisms in inoculum was 0.0011 g/cm 3 and the dry residue of culture medium was 0.0267 g/cm 3 . It's been shown that hydrogen yield in the gas phase reaches 87.5 ± 4.2 % for the association of microorganisms enriched by Clostridium and Bacillus genus with the ratio of inoculum to culture medium 2:3. Fermentation process has been studied in two temperature modes: 22 ± 2 and 35 ± 2 C. It's been determined that temperature increase from 22 ± 2 to 35 ± 2 C increases hydrogen yield by 2 times. It's been shown that the highest hydrogen yield is observed by holding enzymatic process at pH level near 6-6.5 pH decrease switches metabolic pathways from acetate fermentation type to the formation of butyrate, thus reducing hydrogen yield. Conclusions. The most effective method of substrate pretreatment for the process of obtaining hydrogen by anaerobic fermentation of corn and sunflower waste (1:1) was the pretreatment with 20 % NaOH solution for 3 hours. The highest hydrogen yield has been observed in case of inoculum to culture medium ratio set at 2:3 with pH 6-6.5 and the temperature at 35 ± 2 C.

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“…Anaerobic digestion yields depend on several factors [55,56], including temperature [57][58][59][60], organic loading rate [61][62][63][64] and substrate to inoculum ratio [65][66][67]. Under similar operating conditions, substrate characteristics play a key role in defining the amount of biogas that can be recovered by anaerobic digestion, as the theoretical gas yield varies with substrate composition in terms of carbohydrates, proteins and fats, as given in Table 1.…”

Section: Biogas Productionmentioning

confidence: 99%

Combined Biogas and Bioethanol Production: Opportunities and Challenges for Industrial Application

Cesaro

Belgıorno

2015

Energies

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Abstract:In the last decades the increasing energy requirements along with the need to face the consequences of climate change have driven the search for renewable energy sources, in order to replace as much as possible the use of fossil fuels. In this context biomass has generated great interest as it can be converted into energy via several routes, including fermentation and anaerobic digestion. The former is the most common option to produce ethanol, which has been recognized as one of the leading candidates to substitute a large fraction of the liquid fuels produced from oil. As the economic competitiveness of bioethanol fermentation processes has to be enhanced in order to promote its wider implementation, the most recent trends are directed towards the use of fermentation by-products within anaerobic digestion. The integration of both fermentation and anaerobic digestion, in a biorefinery concept, would allow the production of ethanol along with that of biogas, which can be used to produce heat and electricity, thus improving the overall energy balance. This work aims at reviewing the main studies on the combination of both bioethanol and biogas production processes, in order to highlight the strength and weakness of the integrated treatment for industrial application.

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The effect of the labile organic fraction in food waste and the substrate/inoculum ratio on anaerobic digestion for a reliable methane yield

Cited by 139 publications

References 31 publications

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Hydrogen Production During Аnaerobic Fermentation of Corn and Sunflower Waste

Combined Biogas and Bioethanol Production: Opportunities and Challenges for Industrial Application

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