Stillage reflux in food waste ethanol fermentation and its by-product accumulation

Ma, Haile; Yang, Jian; Jia, Yibin; Tashiro, Yukihiro; Sonomoto, Kenji

doi:10.1016/j.biortech.2016.02.127

Cited by 24 publications

(6 citation statements)

References 26 publications

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“…Thus, our research studied removal rates of COD, TOC and lactic acid. Lactic acid was selected because Ma Hongzhi et al 's study indicated that accumulation of lactic acid and salts caused inhibition of ethanol production during stillage reflux [ 24 ]. In this case, lactic acid in stillage was practically a side-product.…”

Section: Resultsmentioning

confidence: 99%

Effect of fermentation stillage of food waste on bioelectricity production and microbial community structure in microbial fuel cells

Cheng

Jia

et al. 2018

R. Soc. open sci.

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A single-chamber microbial fuel cell (MFC) was used in this study to treat recycled stillage obtained from food waste ethanol fermentation. Corresponding substrates inside the system were evaluated by fluorescence spectra, and microbial communities were also investigated. Results demonstrated that output voltage and current, respectively, reached 0.29 V and 1.4 mA with an external resistance of 200 Ω. Corresponding total organic carbon and chemical oxygen demand removal efficiency reached more than 50% and 70%, respectively. Results of fluorescence spectra demonstrated that tryptophan-like aromatic, soluble microbial by-product-like and humic acid-like substances accumulated and were not easily degraded. Microbial community analysis by high-throughput sequence indicated that Advenella and Moheibacter occupied the highest proportion among all genera at the anode instead of Geobacter. These results may be due to complicated accumulated stillage, and potential tetracyclines possibly influenced microbial communities. Details on how stillage affects MFC operation should be further studied, and a solution on relieving effects should be established.

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Section: Resultsmentioning

confidence: 99%

Effect of fermentation stillage of food waste on bioelectricity production and microbial community structure in microbial fuel cells

Cheng

Jia

et al. 2018

R. Soc. open sci.

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“…The addition of 1.0-1.5% FM NaOH may support lactic bacteria and increase the digestibility value of dry matter by improving the digestibility of neutral detergent fiber [31,32,42]. Furthermore, increased lactic acid concentrations may inhibit ethanol fermentation [43]. Nevertheless, the addition of NaOH to the ensiling process did not show an improved biogas potential in batch tests.…”

Section: Discussionmentioning

confidence: 99%

Challenges and Prospects of Biogas from Energy Cane as Supplement to Bioethanol Production

et al. 2020

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Innovative breeds of sugar cane yield up to 2.5 times as much organic matter as conventional breeds, resulting in a great potential for biogas production. The use of biogas production as a complementary solution to conventional and second-generation ethanol production in Brazil may increase the energy produced per hectare in the sugarcane sector. Herein, it was demonstrated that through ensiling, energy cane can be conserved for six months; the stored cane can then be fed into a continuous biogas process. This approach is necessary to achieve year-round biogas production at an industrial scale. Batch tests revealed specific biogas potentials between 400 and 600 LN/kgVS for both the ensiled and non-ensiled energy cane, and the specific biogas potential of a continuous biogas process fed with ensiled energy cane was in the same range. Peak biogas losses through ensiling of up to 27% after six months were observed. Finally, compared with second-generation ethanol production using energy cane, the results indicated that biogas production from energy cane may lead to higher energy yields per hectare, with an average energy yield of up to 162 MWh/ha. Finally, the Farm2CBG concept is introduced, showing an approach for decentralized biogas production.

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“…This practice was studied by many authors in order to take advantage of the effluent obtained after the anaerobic digestion or of the condensate obtained from stillage concentration by evaporation [22,34,[74][75][76][77][78]. Recycling is only limited by the accumulation of inhibitory compounds [74,75,79]. Due to the presence of acetic acid in the permeate stream, it is possible to consider the recovery of this compound.…”

Section: Industrial Stillage Solutionmentioning

confidence: 99%

Sugarcane Stillage Treatment Using Direct Contact Membrane Distillation

Ferreiro

Kronemberger

Borges

2020

Waste Biomass Valor

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Direct contact membrane distillation (DCMD) was evaluated as an alternative for the treatment of sugarcane stillage obtained in the bioethanol production process. First, a synthetic stillage solution was prepared in order to study the influence of the main operational parameters of DCMD in the permeate flux, as well as to analyze the separation of volatile components (such as ethanol and acetic acid) and the concentration of non-volatile components presented in the feed stream (sucrose and other salts). Secondly, an industrial sample of sugarcane stillage was treated using DCMD. The highest flux achieved was 13.4 kg/m 2 •h for a transmembrane temperature difference of 55 °C, reaching a recovery degree of 70% with a specific thermal energy consumption of 671 kWh/m 3 . Then, sugarcane stillage was concentrated until 60°Brix. A preliminary economic study was also presented, an estimated cost of 1.25 $ per m 3 of recovered permeate was obtained without any heat integration or DCMD operational optimization. DCMD showed to be suitable for stillage disposal allowing to recuperate the permeate stream as process water (containing mainly water and a low concentration of volatile components) and the concentrated stillage as biofuel to be used in the steam boiler (for producing more energy making the process thermally sustainable) or for ferti-irrigation (for reducing the transportation cost due to the volume reduction).

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Stillage reflux in food waste ethanol fermentation and its by-product accumulation

Cited by 24 publications

References 26 publications

Effect of fermentation stillage of food waste on bioelectricity production and microbial community structure in microbial fuel cells

Effect of fermentation stillage of food waste on bioelectricity production and microbial community structure in microbial fuel cells

Challenges and Prospects of Biogas from Energy Cane as Supplement to Bioethanol Production

Sugarcane Stillage Treatment Using Direct Contact Membrane Distillation

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