Concentration of Organic Acid from Fermented Food Wastes Using a MF/RO Process

2008 ◽  
Vol 569 ◽  
pp. 281-284 ◽  
Author(s):  
Jin Woo Lee ◽  
Jong Oh Kim ◽  
Jong Tae Jung
Keyword(s):  
Organic Acid ◽  
Food Waste ◽  
Fermentation Broth ◽  
Value Added ◽  
Chloride Ion ◽  
Fermented Food ◽  
Ion Concentration ◽  
Food Wastes ◽  
Solid Liquid ◽  
Solid Liquid Separation

The amount of food waste has been increasing every year. Food waste takes relativity high portion of domestic waste and we have much difficulty in treating it. Most of food wastes are landfilled or incinerated after drying for the reduction of water content. The operation cost of the landfill and the incineration are very high. To solve the landfill and the incineration problems in recent years, the recycling of food waste was used by the methods of turning food waste into animal food and fertilizer. Food wastes are compatible to be used as feedstock of the fermentation because they contain valuable nutrients. Among these situations, organic acids, which are effectively used in a variety of industrial processes, can be considered to be a high cost value-added products. The purpose of this study is to evaluate the possibility of organic acid concentration using a MF/RO system. A MF/RO system was believed to be an effective one for the concentration of organic acid from food waste. Water quality of fermentation broth, MF permeate and RO retentate in terms of conductivity, pH, electric conductivity, TS (Total solids), TDS (Total dissolved solids), CODcr concentration, chloride ion concentration was examined as analytic items. pH of fermentation broth was higher than that of MF permeate and RO retentate due to the concentration of organic acid. pH of RO retentate was about 4. Conductivity, TDS, CODCr and chloride ion of RO retentate were about 1.3, 1.3, 2.9, 4.5 times higher than that of fermentation broth, respectively and TS reduced about 0.8 times. This may be ascribed to separate effectively the solid-liquid separation by MF and RO rejection. Consequently, a MF/RO system is believed to be applicable for the concentration of organic acid from fermentation broth of food waste.

scholarly journals Energy and pressure requirements for compression of swine solid fraction compost

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
Niccolò Pampuro ◽  
Alessio Facello ◽  
Eugenio Cavallo
Keyword(s):  
Solid Fraction ◽  
Liquid Fraction ◽  
Value Added ◽  
Pig Slurry ◽  
Application Time ◽  
Soil Fertilization ◽  
Pressure Application ◽  
Potential Risks ◽  
Solid Liquid ◽  
Solid Liquid Separation

The excessive amount of pig slurry spread on soil has contributed to nitrate water pollution both in surface and in ground waters, especially in areas classified as vulnerable zones to nitrate in accordance with European Regulation (91/676/CEE). Several techniques have been developed to manage livestock slurries as cheaply and conveniently as possible and to reduce potential risks of environmental pollution. Among these techniques, solid-liquid separation of slurry is a common practice in Italy. The liquid fraction can be used for irrigation and the solid fraction, after aerobic stabilization, produces an organic compost rich in humic substances. However, compost derived from swine solid fraction is a low density material (bulk density less than 500 kg􀀀m–3). This makes it costly to transport composted swine solid fraction from production sites to areas where it could be effectively utilized for value-added applications such as in soil fertilization. Densification is one possible way to enhance the storage and transportation of the compost. This study therefore investigates the effect of pressure (20- 110 MPa) and pressure application time (5-120 s) on the compaction characteristics of compost derived from swine solid fraction. Two different types of material have been used: composted swine solid fraction derived from mechanical separation and compost obtained by mixing the first material with wood chips. Results obtained showed that both the pressure applied and the pressure application time significantly affect the density of the compacted samples; while the specific compression energy is significantly affected only by the pressure. Best predictor equations were developed to predict compact density and the specific compression energy required by the densification process. The specific compression energy values based on the results from this study (6-32 kJ􀀀kg–1) were significantly lower than the specific energy required to manufacture pellets from biomass feedstock (typically 19-90 kJ􀀀kg–1).

scholarly journals Fermentation of Agri-Food Waste: A Promising Route for the Production of Aroma Compounds

Foods ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 707
Author(s):  
Jasmine Hadj Saadoun ◽  
Gaia Bertani ◽  
Alessia Levante ◽  
Fabio Vezzosi ◽  
Annalisa Ricci ◽  
...  
Keyword(s):  
Food Waste ◽  
Food Processing ◽  
Value Added ◽  
Economic Loss ◽  
Environmental Issue ◽  
Food Wastes ◽  
Whole Process ◽  
Processing And Storage ◽  
And Storage ◽  
Value Added Products

Food waste and byproducts are generated along the entire food processing and storage chain. The large amount of waste deriving from the whole process represents not only a great economic loss but also an important ethical and environmental issue in terms of failure to recycle potentially reusable materials. New, clear strategies are needed to limit the amount of waste produced and, at the same time, promote its enhancement for further conversion and application to different industrial fields. This review gives an overview of the biological approaches used so far to exploit agri-food wastes and byproducts. The application of solid-state fermentation by different microorganisms (fungi, yeasts, bacteria) to produce several value-added products was analyzed, focusing on the exploitation of lactic acid bacteria as workhorses for the production of flavoring compounds.

Application of Ceramic Membrane Filtration to Remove the Solid in Nisin Fermentation Broth

2008 ◽  
Vol 4 (4) ◽  
Author(s):  
Zhaoliang Wu ◽  
Yuqiang Ji ◽  
Yanan Guo ◽  
Junna Hu
Keyword(s):  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Fermentation Broth ◽  
Experimental Results ◽  
Liquid Separation ◽  
Removal Ratio ◽  
Nisin Fermentation ◽  
Solid Liquid ◽  
Solid Liquid Separation

Solid-liquid separation is an important step for the separation of nisin from the fermentation broth. This paper studied the application of ceramic membrane filtration to remove the solid. Experimental results indicated that the solid removal ratio was above 99% at pH 2.5, 40-50 °C, 0.1 Mpa, recovery of nisin being 84.4%, and while at pH 2.5 HCl was added to dilute the residue in the later stage. Compared to the recovery without the diluted residue, the yield increased 17.4%.

scholarly journals Green Process: Improved Semi-Continuous Fermentation of Pichia pastoris Based on the Principle of Vitality Cell Separation

2021 ◽  
Vol 9 ◽  
Author(s):  
Denggang Wang ◽  
Wenjie Li ◽  
Xinying Zhang ◽  
Shuli Liang ◽  
Ying Lin
Keyword(s):  
Pichia Pastoris ◽  
Metal Ions ◽  
Large Scale ◽  
Continuous Fermentation ◽  
Fermentation Broth ◽  
Pectate Lyase ◽  
Salt Bridges ◽  
The Cost ◽  
Solid Liquid ◽  
Solid Liquid Separation

The large-scale fermentation of Pichia pastoris for recombinant protein production would be time consuming and produce a large amount of waste yeast. Here we introduce a novel semi-continuous fermentation process for P. pastoris GS115 that can separate vitality cells from broth and recycle the cells to produce high-secretory recombinant pectate lyase. It is based on differences in cell sedimentation coefficients with the formation of salt bridges between metal ions and various cell states. Compared to batch-fed cultivation and general semi-continuous culture, the novel process has significant advantages, such as consuming fewer resources, taking less time, and producing less waste yeast. Sedimentation with the addition of Fe3+ metal ions consumed 14.8 ± 0.0% glycerol, 97.8 ± 1.3% methanol, 55.0 ± 0.9 inorganic salts, 81.5 ± 0.0% time cost, and 77.0 ± 0.1% waste yeast versus batch-fed cultivation to produce an equal amount of protein; in addition, the cost of solid–liquid separation was lower for cells in the collected fermentation broth. The process is economically and environmentally efficient for producing recombinant proteins.

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