Enzymatical hydrolysis of food waste and ethanol production from the hydrolysate

Yan, Shiguang; Li, Jun; Chen, Xiang-Song; Wu, Jiawei; Wang, Pingchao; Ye, Jianfeng; Yang, Jianming

doi:10.1016/j.renene.2010.08.020

Cited by 113 publications

(39 citation statements)

References 18 publications

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“…In many Asian countries, landfill and open dumping of food waste represent a large proportion of waste treatment methods [13]. Other practices of food waste utilization, such as feeding animals, have raised serious hygiene-related issues and the use of them as fertilizers can cause severe pollution of water [14,15]. Moreover, in recent years regulations about feeding animals with food waste have become stricter.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Μάτσακας

Christakopoulos

2015

Sustainability

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Abstract:The environmental crisis and the need to find renewable fuel alternatives have made production of biofuels an important priority. At the same time, the increasing production of food waste is an important environmental issue. For this reason, production of ethanol from food waste is an interesting approach. Volumes of food waste are reduced and ethanol production does not compete with food production. In this work, we evaluated the possibility of using source-separated household food waste for the production of ethanol. To minimize the cost of ethanol production, the hydrolytic enzymes that are necessary for cellulose hydrolysis were produced in-house using the thermophillic fungus Myceliophthora thermophila. At the initial stage of the study, production of these thermophilic enzymes was studied and optimized, resulting in an activity of 0.28 FPU/mL in the extracellular broth. These enzymes were used to saccharify household food waste at a high dry material consistency of 30% w/w, followed by fermentation. Ethanol production reached 19.27 g/L with a volumetric productivity of 0.92 g/L·h, whereas only 5.98 g/L of ethanol was produced with a volumetric productivity of 0.28 g/L·h when no enzymatic saccharification was used.

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Section: Introductionmentioning

confidence: 99%

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Μάτσακας

Christakopoulos

2015

Sustainability

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“…Another option is the recovery of sugar monomers, glycerol, short and long fatty acids, amino acids and phosphate from food waste, which are wanted nutrients in many biotechnological processes for cultivation of bacteria, fungi, algae, and production of primary and secondary metabolites [14][15][16][17][18][19][20].…”

Section: Organic and Food Wastes As Raw Materialsmentioning

confidence: 99%

Valorisation of food waste in biotechnological processes

Pleißner

Lin

2013

sustain chem process

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Around 1.3 billion tonnes of food are wasted worldwide per year, which is originally produced under extensive use of energy and nutrients. Use of food waste as feedstock in biotechnological processes provides an innovative way to recover parts of the energy and nutrients initially spent on food production. By chemical and biological methods, food waste is hydrolysed to glucose, free amino nitrogen and phosphate, which are utilisable as nutrients by many microorganisms whose metabolic versatility enables the production of a wide range of products. Microalgae are particularly of interest as chemicals, materials and energy are obtainable from microalgal biomass after chemical and/or biological modifications. In this review, valorisation of food waste in biotechnological processes is presented as an additional option to green chemical technologies.

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“…A common practice of HFW management is landfill disposal, which is causing severe environmental problems (such as greenhouse gas emissions) and shortage of disposal places [6,12,13]. Other practices are utilization as animal feed (which can raise hygiene issues) and soil conditioners-fertilizers (which can cause severe pollution to surface and underground water) [6,12,14]. Alternatively HFW can be used for the production of bio-based (green) chemicals and bio-energy (for example, biogas and ethanol) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Utilization Of Household Food Waste For The Production Of Ethanol At High Dry Material Content

Μάτσακας¹,

Kekos²,

Loizidou³

et al. 2015

Solid Waste as a Renewable Resource

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Background: Environmental issues and shortage of fossil fuels have turned the public interest to the utilization of renewable, environmentally friendly fuels, such as ethanol. In order to minimize the competition between fuels and food production, researchers are focusing their efforts to the utilization of wastes and by-products as raw materials for the production of ethanol. household food wastes are being produced in great quantities in European Union and their handling can be a challenge. Moreover, their disposal can cause severe environmental issues (for example emission of greenhouse gasses). On the other hand, they contain significant amounts of sugars (both soluble and insoluble) and they can be used as raw material for the production of ethanol. Results: Household food wastes were utilized as raw material for the production of ethanol at high dry material consistencies. A distinct liquefaction/saccharification step has been included to the process, which rapidly reduced the viscosity of the high solid content substrate, resulting in better mixing of the fermenting microorganism. This step had a positive effect in both ethanol production and productivity, leading to a significant increase in both values, which was up to 40.81% and 4.46 fold, respectively. Remaining solids (residue) after fermentation at 45% w/v dry material (which contained also the unhydrolyzed fraction of cellulose), were subjected to a hydrothermal pretreatment in order to be utilized as raw material for a subsequent ethanol fermentation. This led to an increase of 13.16% in the ethanol production levels achieving a final ethanol yield of 107.58 g/kg dry material. Conclusions: In conclusion, the ability of utilizing household food waste for the production of ethanol at elevated dry material content has been demonstrated. A separate liquefaction/saccharification process can increase both ethanol production and productivity. Finally, subsequent fermentation of the remaining solids could lead to an increase of the overall ethanol production yield.

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Enzymatical hydrolysis of food waste and ethanol production from the hydrolysate

Cited by 113 publications

References 18 publications

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Ethanol Production from Enzymatically Treated Dried Food Waste Using Enzymes Produced On-Site

Valorisation of food waste in biotechnological processes

Utilization Of Household Food Waste For The Production Of Ethanol At High Dry Material Content

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