Volatile fatty acids accumulation and rhamnolipid generation in situ from waste activated sludge fermentation stimulated by external rhamnolipid addition

Zhou, Aijuan; Yang, Chunxue; Guo, Zechong; Hou, Yanan; Liu, Wenzong; Wang, Aijie

doi:10.1016/j.bej.2013.06.007

Cited by 89 publications

(87 citation statements)

References 25 publications

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“…The composition of volatile fatty acids (VFAs) was analyzed by using an Agilent 7890 gas chromatography system. 32 Soluble chemical oxygen demand (SCOD), total chemical oxygen demand (TCOD), carbohydrate(saccharides), and protein were determined as described previously. 30 Voltage and current were recorded using a multimeter (model 2700; Keithley Instruments, U.S.A.) every 10 min.…”

Section: ■ Methods and Materialsmentioning

confidence: 99%

Biocathodic Methanogenic Community in an Integrated Anaerobic Digestion and Microbial Electrolysis System for Enhancement of Methane Production from Waste Sludge

Cai

Liu

Yang

et al. 2016

ACS Sustainable Chem. Eng.

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116

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Understanding the microbial community structure relative to enhancement of methane production from digestion of waste-activated sludge (WAS) coupled with a bioelectrochemical system is a key scientific question for the potential application of bioelectrochemistry in biogas production. Little has been known about the influence of electrode on the structure and function of microbial communities, especially methanogens in a bioelectrochemical anaerobic digestion (AD) reactor. Here, a hybrid reactor, which coupled bioelectrolysis and AD, was developed to enhance methane recovery from WAS. The methane production rate reached up to 0.0564 m 3 methane/(m 3 reactor*d) in the hybrid reactor at room temperature, which was nearly double than that of the control anaerobic reactor (0.0259 m 3 methane/(m 3 reactor*d)) without bioelectrochemical device. Microbial community analysis revealed that hydrogenotrophic methanogen Methanobacterium dominated the cathode biofilm, which was the predominant contributor to accelerate the methane production rate from WAS. While acetoclastic methanogen Methanosaeta was enriched in the sludge phase of all reactors, shifts of the microbial community structure of the biocathode was in significant correlation with the methane production. This study suggested a potential way to utilize a bioelectrochemical system with the regulated microbial community to enhance methane production from WAS.

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Section: ■ Methods and Materialsmentioning

confidence: 99%

Biocathodic Methanogenic Community in an Integrated Anaerobic Digestion and Microbial Electrolysis System for Enhancement of Methane Production from Waste Sludge

Cai

Liu

Yang

et al. 2016

ACS Sustainable Chem. Eng.

Self Cite

116

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“…The energy and coulombic efficiency were calculated to characterize the performance of MEC reactor [23]. Columbic efficiency indicated the recovery ability of electron, defined by the ratio of coulombs recovery to the total coulombs in substrate, which is integrated by current and time according to the equation Q ¼ I Â t.…”

Section: Analysis and Calculation Methodsmentioning

confidence: 99%

“…The volume of generated gas was measured by a glass syringe. The VFAs were analysis by a gas chromatography (Agilent 4890; J&W Scientific, USA) with a capillary column (19095Ne123HP-INNOWAX; 30 Â 0.530 mm Â 1.00 ìm; J&W Scientific, USA) [23].…”

Section: Analysis and Calculation Methodsmentioning

confidence: 99%

Improvement of bioelectrochemical property and energy recovery by acylhomoserine lactones (AHLs) in microbial electrolysis cells (MECs)

Liu

Cai

et al. 2015

Journal of Power Sources

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“…As a result, the vast majority of dark fermentation applications usually involve the use of a suitable pretreatment process of the waste stream prior to biological treatment. Hydrolysis can be enhanced either by thermal, ultrasonic, microwave or chemical pretreatment with acid, alkali, surfactants, ozone or other reactive substances [18][19][20]. These methods damage cell walls, releasing intracellular substances and/or enhance the solubilization of extracellular matter.…”

Section: Vfa Production Through Dark Fermentationmentioning

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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Volatile fatty acids accumulation and rhamnolipid generation in situ from waste activated sludge fermentation stimulated by external rhamnolipid addition

Cited by 89 publications

References 25 publications

Biocathodic Methanogenic Community in an Integrated Anaerobic Digestion and Microbial Electrolysis System for Enhancement of Methane Production from Waste Sludge

Biocathodic Methanogenic Community in an Integrated Anaerobic Digestion and Microbial Electrolysis System for Enhancement of Methane Production from Waste Sludge

Improvement of bioelectrochemical property and energy recovery by acylhomoserine lactones (AHLs) in microbial electrolysis cells (MECs)

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

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