Extraction of medium chain fatty acids from organic municipal waste and subsequent production of bio-based fuels

Kannengießer, Jan; Sakaguchi‐Söder, Kaori; Mrukwia, Timo; Jäger, Johannes; Schebek, Liselotte

doi:10.1016/j.wasman.2015.05.030

Cited by 48 publications

(35 citation statements)

References 10 publications

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“…Chain elongation is a recently established bioprocess that can employ a mixed culture to recover value‐added chemicals and fuel precursors from organic waste . Chain elongation has been applied to, for example, solid organic waste such as the organic fraction of municipal solid waste (OFMSW).…”

Section: Introductionmentioning

confidence: 99%

Isobutyrate biosynthesis via methanol chain elongation: converting organic wastes to platform chemicals

Chen

Huang

Strik

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND Isobutyrate is a platform chemical that is currently produced from a non‐renewable fossil‐based feedstock. This study aimed at developing a renewable isobutyrate production process by using methanol chain elongation, a novel bioprocess that uses organic waste as primary feedstocks and an undefined reactor microbiome as the catalyst. RESULTS A continuous anaerobic bioreactor experiment was first performed using a synthetic medium containing acetate, butyrate and methanol, all of which are common derivatives from organic residues. Continuous isobutyrate (2.0 g L−1 day−1) and caproate formation (0.2 g L−1 day−1) from methanol, acetate and butyrate were demonstrated. A batch test to synthesise isobutyrate from a real organic waste, i.e. acidified supermarket waste (ASW), was performed. Up to 6.2 g L−1 isobutyrate was formed which accounted for 63% of all identified products. CONCLUSION In this study, a proof‐of‐principle for isobutyrate production from organic waste via methanol chain elongation was demonstrated. The continuous accumulation or supply of butyrate, the suppression of methanogenic activity and methanol addition were shown to be of use to provide conditions for isobutyrate formation. © 2016 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Isobutyrate biosynthesis via methanol chain elongation: converting organic wastes to platform chemicals

Chen

Huang

Strik

et al. 2016

J of Chemical Tech & Biotech

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“…various microbial species . and extraction processes . Most studies used low concentrations of ethanol (<300 mmol L −1 ) for the production of caproate due to the inhibition effect of ethanol on microbial cells .…”

Section: Bess Versus Anaerobic Digestion Bioreactorsmentioning

confidence: 99%

Bioelectrochemical synthesis of caproate through chain elongation as a complementary technology to anaerobic digestion

Reddy

ElMekawy

Pant

2018

Biofuels Bioprod Bioref

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Chain elongation is one of the common anaerobic fermentation processes in which bacteria convert ethanol and short chain fatty acids (SCFA) into medium chain fatty acids (MCFA). These are single carboxylic acids having six to twelve carbon atoms, with several applications, such as biofuels. Caproate is a promising MCFA, and several technologies were proposed for the valorization of waste to obtain it. Bioelectrochemical systems (BESs) are technologies that are capable of converting the chemical energy of organic/inorganic wastes into value‐added products, using in situ generated H2 or electricity as energy sources. To convert waste biomass into caproate, an electron donor in the form of hydrogen or ethanol should be supplemented within the anaerobic fermentation, which can be used as the electron donor in the cathodic compartment for the conversion of acetate into caproate. This review highlights recent anaerobic and bioelectrochemical processes for the production of caproate. The discussion will also cover the potential applications of this technology, together with obstacles to its use, compared with the conventional anaerobic digestion (AD) process, and considers whether it could be a standalone technology or a complementary one for AD. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…In small-scale tests, landfill reactors with a total volume of 120 l were simulated. Although the waste was also taken from the solid FIGURE 1: Schematic diagram of the modified rotting box (Kannengiesser, 2015).…”

Section: Investigations With Substrate From Developing Countriesmentioning

confidence: 99%

“…Estimated product quantities before technology optimisation .at the composting facility in Darmstadt[Kannengiesser, 2015]. Concentration of carboxylic acids in the solvent phase from the African waste.…”

mentioning

confidence: 99%

Generation of Bio-Based Products From Omsw by Using a Solid-Liquid Separation Technique and an Anaerobic Treatment

et al. 2018

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The present paper provides an overview of the investigations (involving different liquids) regarding a new technology that is able to generate valuable bio-based products by using the liquid phase from organic municipal waste as raw material. The liquids used in this study were tested and treated in different ways to find out which substrates are most suitable for the process. For the purpose of generating bio-based products from organic waste, a solid-liquid separation process was performed first. Thereafter, in order to increase the amount of non-polar fatty acids (FAs) in the liquid substrate, an anaerobic digestion process was used. However, after the digestion, most of the FAs found in the liquid substrate were polar FAs. To increase the amount of non-polar FAs further, another treatment step, "ethanol maturation", was carried out as the third step. Subsequently, the refining process was started with the extraction of the FAs from the liquid substrate by using a non-polar extraction solvent, such as Oleic acid methyl ester (OME). At this point, "extractive digestion" takes place. The FAs can be extracted over a longer period of time and during the digestion. As a result, the amount of longer-chain fatty acids in the OME increases. After re-extracting the FAs from the solvent, a transesterification process was used to produce fatty acid ethyl esters, which can be sold as cleaners or solvents to the metal industry for surface treatment. The production of other bio-based products, such as lubricants, fuels and polymers, is also possible. The following five substrates were mainly used for the investigations: (1) a liquid phase from organic municipal waste, produced by a percolation process; (2) fresh percolate from German kitchen waste; (3) percolates of different stages from a digestion plant in Germany; (4) old leachate from German landfills; and (5) young landfill leachate or leachate from pressed municipal solid waste, which was used to imitate African waste. These substrates were treated using the method described above. The results show that young landfill leachate has the highest potential. The highest availability of FAs occurs after biological pre-treatment of percolates. For this reason, very fresh percolates hardly contain any fatty acid. They must first be generated by the biological degradation of the organic ingredients.

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Extraction of medium chain fatty acids from organic municipal waste and subsequent production of bio-based fuels

Cited by 48 publications

References 10 publications

Isobutyrate biosynthesis via methanol chain elongation: converting organic wastes to platform chemicals

Isobutyrate biosynthesis via methanol chain elongation: converting organic wastes to platform chemicals

Bioelectrochemical synthesis of caproate through chain elongation as a complementary technology to anaerobic digestion

Generation of Bio-Based Products From Omsw by Using a Solid-Liquid Separation Technique and an Anaerobic Treatment

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