A review of the production and applications of waste-derived volatile fatty acids

Lee, Wee Shen; Chua, Adeline Seak May; Yeoh, Hak Koon; Ngoh, Gek Cheng

doi:10.1016/j.cej.2013.09.002

Cited by 695 publications

(485 citation statements)

References 156 publications

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“…To exploit the potential of using wastes as feedstock, waste management needs to move from treatment-oriented processes to the integration of technologies able to valorize organic waste streams for the production of value-added products [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

et al. 2017

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Abstract:In this work, hardwood sulfite spent liquor (HSSL)-a by-product from a pulp and paper industry-was used as substrate to produce short-chain organic acids (SCOAs) through acidogenic fermentation. SCOAs have a broad range of applications, including the production of biopolymers, bioenergy, and biological removal of nutrients from wastewaters. A continuous stirred tank reactor (CSTR) configuration was chosen to impose selective pressure conditions. The CSTR was operated for 88 days at 30 • C, without pH control, and 1.76 days of hydraulic and sludge retention times were imposed. The culture required 46 days to adapt to the conditions imposed, reaching a pseudo-steady state after this period. The maximum concentration of SCOAs produced occurred on day 71-7.0 g carbon oxygen demand (COD)/L that corresponded to a degree of acidification of 36%. Acetate, propionate, butyrate, valerate, and lactate were the SCOAs produced throughout the 88 days, with an average proportion of 59:17:19:1.0:4.0%, respectively.

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Section: Introductionmentioning

confidence: 99%

“…SCOA production is currently achieved by chemical synthesis, followed by distillation at atmospheric pressure [2]. These compounds have a maximum of six carbon atoms, and present a broad range of applications in the production of biopolymers [4,5], bioenergy [6], and the biological removal of nutrients from wastewaters [4,7].…”

Section: Introductionmentioning

confidence: 99%

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

et al. 2017

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“…The composition of the acid fraction of the liquid product depends on various variables, like the type of waste stream used and the fermentation conditions (pH, fermentation time, etc.) [1,28]. The pH value for example plays an important role in the synthesis of different VFA.…”

Section: Available Waste Streams For Vfa Production and Vfa Yieldsmentioning

confidence: 99%

“…The term Volatile Fatty Acids (VFA) is applied to short-chain fatty acids, usually consisted of two to six carbon atoms, such as acetic, butyric or propionic acid [1]. VFA are organic chemicals with various applications; they can be provided as carbon sources to microorganisms that produce useful metabolites or remove organic pollutants from waste water, they are utilized for electricity or hydrogen generation and they can serve as starting materials for the synthesis of long-chain fatty acids and polyhydroxyalkanoates (PHAs) for packaging applications [2].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Volatile Fatty Acids from Microalgae for the Production of High Added Value Compounds

et al. 2017

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Volatile Fatty Acids (VFA) are small organic compounds that have attracted much attention lately, due to their use as a carbon source for microorganisms involved in the production of bioactive compounds, biodegradable materials and energy. Low cost production of VFA from different types of waste streams can occur via dark fermentation, offering a promising approach for the production of biofuels and biochemicals with simultaneous reduction of waste volume. VFA can be subsequently utilized in fermentation processes and efficiently transformed into bioactive compounds that can be used in the food and nutraceutical industry for the development of functional foods with scientifically sustained claims. Microalgae are oleaginous microorganisms that are able to grow in heterotrophic cultures supported by VFA as a carbon source and accumulate high amounts of valuable products, such as omega-3 fatty acids and exopolysaccharides. This article reviews the different types of waste streams in concert with their potential to produce VFA, the possible factors that affect the VFA production process and the utilization of the resulting VFA in microalgae fermentation processes. The biology of VFA utilization, the potential products and the downstream processes are discussed in detail.

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“…The anaerobic fermentation aimed to the exploitation of the carbohydrates of the waste streams to generate VFAs rich effluents [27,28], which are the most direct substrates for PHAs production. As demonstrated by Cerrone [19], an incubation time of 27 h is not sufficient to transform all the sugars in VFAs by mesophilic bacteria.…”

Section: Microbial Phb Productionmentioning

confidence: 99%

Complete Valorization of Olive Mill Wastewater through an Integrated Process for Poly-3-hydroxybutyrate Production

Carofiglio¹,

Romanò²,

Servili³

et al. 2015

JLS

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An economical and environmental sustainability of bioplastic production is dependent on the use of low cost and waste C-sources as raw materials. OMW (Olive Mill Wastewater) with its high organic load represents a dangerous polluting waste. Herein the authors present an integrated process for the simultaneous recovery of polyphenols, high value natural antioxidants, production of PHAs (polyhydroxyalkanotes), thermoplastic bio-polymers, in particular of PHB (poly-3-hydroxybutyrate) starting from OMW. The combination of membrane filtration and bacterial digestion of OMW resulted in very high yields of polyphenols (32.5 g/L) and PHB (31.4 mg/L·h) if compared with the state of the art. These results make the technical approach described here effective for reducing the polluting effect of OMW and maximizing the valuable product yield. Moreover the process is readily suitable for an industrial scale PHB production from OMW.

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A review of the production and applications of waste-derived volatile fatty acids

Cited by 695 publications

References 156 publications

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

Valorization of a Pulp Industry By-Product through the Production of Short-Chain Organic Acids

Utilization of Volatile Fatty Acids from Microalgae for the Production of High Added Value Compounds

Complete Valorization of Olive Mill Wastewater through an Integrated Process for Poly-3-hydroxybutyrate Production

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