Bioelectrochemical reduction of volatile fatty acids in anaerobic digestion effluent for the production of biofuels

Kondaveeti, Sanath; Min, Booki

doi:10.1016/j.watres.2015.09.011

Cited by 61 publications

(36 citation statements)

References 31 publications

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“…A previous study showed that the limiting factors, at the anodic biofilm, change from potential limitations at low conductivity, to dual potential and carbon source transfer limitations at a moderate conductivity, and to only mass transfer limitations at high conductivity [ 48 ]. A low conductivity (<1 mS/cm) was observed in common AD effluent after organic removal and biological treatment, moreover, a higher external voltage was required when connecting BES after AD to achieve biofuels [ 49 ]. In this respect, pretreatment is an important and flexible tool to regulate the performance of BES and AD integrated process, which would determine the total efficiency on waste treatment and biofuel recovery.…”

Section: Resultsmentioning

confidence: 99%

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Liu

Yang

et al. 2016

Biotechnol Biofuels

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BackgroundBioelectrochemical systems have been considered a promising novel technology that shows an enhanced energy recovery, as well as generation of value-added products. A number of recent studies suggested that an enhancement of carbon conversion and biogas production can be achieved in an integrated system of microbial electrolysis cell (MEC) and anaerobic digestion (AD) for waste activated sludge (WAS). Microbial communities in integrated system would build a thorough energetic and metabolic interaction network regarding fermentation communities and electrode respiring communities. The characterization of integrated community structure and community shifts is not well understood, however, it starts to attract interest of scientists and engineers.ResultsIn the present work, energy recovery and WAS conversion are comprehensively affected by typical pretreated biosolid characteristics. We investigated the interaction of fermentation communities and electrode respiring communities in an integrated system of WAS fermentation and MEC for hydrogen recovery. A high energy recovery was achieved in the MECs feeding WAS fermentation liquid through alkaline pretreatment. Some anaerobes belonging to Firmicutes (Acetoanaerobium, Acetobacterium, and Fusibacter) showed synergistic relationship with exoelectrogens in the degradation of complex organic matter or recycling of MEC products (H2). High protein and polysaccharide but low fatty acid content led to the dominance of Proteiniclasticum and Parabacteroides, which showed a delayed contribution to the extracellular electron transport leading to a slow cascade utilization of WAS.ConclusionsEfficient pretreatment could supply more short-chain fatty acids and higher conductivities in the fermentative liquid, which facilitated mass transfer in anodic biofilm. The overall performance of WAS cascade utilization was substantially related to the microbial community structures, which in turn depended on the initial pretreatment to enhance WAS fermentation. It is worth noting that species in AD and MEC communities are able to build complex networks of interaction, which have not been sufficiently studied so far. It is therefore important to understand how choosing operational parameters can influence reactor performances. The current study highlights the interaction of fermentative bacteria and exoelectrogens in the integrated system.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-016-0493-2) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Liu

Yang

et al. 2016

Biotechnol Biofuels

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“…The bioelectrochemical system (BES), which employs microorganisms and a bacterial community as a biocatalyst, has been developed to convert CO 2 , a greenhouse gas, into liquid biofuels, such as ethanol and butanol, as well as platform chemicals [1]. Several bacterial species, called cathodophilic microorganisms (e.g., Sporomusa ovata and Clostridium ljungdahlii) were reported to interact with a carbon electrode by accepting electrons supplied externally from a power supply [2][3][4].…”

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confidence: 99%

Biologically activated graphite fiber electrode for autotrophic acetate production from CO₂in a bioelectrochemical system

Im¹,

Song²,

Jeon³

et al. 2016

Carbon letters

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Recently, microbial electrosynthesis (MESs) has been highlighted for the purpose of biological CO 2 reduction with simultaneous production of intermediates and value-added chemicals. The bioelectrochemical system (BES), which employs microorganisms and a bacterial community as a biocatalyst, has been developed to convert CO 2 , a greenhouse gas, into liquid biofuels, such as ethanol and butanol, as well as platform chemicals [1]. Several bacterial species, called cathodophilic microorganisms (e.g., Sporomusa ovata and Clostridium ljungdahlii) were reported to interact with a carbon electrode by accepting electrons supplied externally from a power supply [2][3][4]. Through this process, oxidized chemical molecules, such as CO 2 , can be converted to more reduced products, such as acetate and ethanol [4,5]. Since the first report of MESs with S. ovata [3,4], performance has been improved by efforts to optimize the reactor design, regulate the applied potential, and improve the bacterial enrichment method [6][7][8]. On the other hand, the interaction between microorganism and carbon materials is still unknown, which is the main factor limiting further improvement of the performance of the MES process. For example, insufficient information about microbecarbon interactions is delaying the advance of the process significantly when the input potential is <−410 mV vs standard hydrogen electrode (SHE), which is the theoretical minimum potential for hydrogen production [9].Carbon has been recognized as the best material for fuel cell applications owing to its good electrical conductivity, its potential for the impregnation of catalysts, and its cost effectiveness [10,11]. For the same reasons, a range of morphologies of carbon materials have been utilized as anode and cathode electrodes in BES in the form of carbon paper, cloth, graphite rod, and felt in BES systems [12]. The porous structure of carbon can also provide sufficient surface area for bacterial attachment, allowing the establishment of an electron transport system to the electrode, and good stability (i.e., resistant to oxidation and reduction). Modified carbon electrodes with chitosan and cyanuric chloride improved their electrosynthetic performance more than 6-fold compared to an untreated carbon electrode [12]. The excellent formation of biofilm on the carbon electrode, acting as a catalyst for MESs, can provide a novel application platform of carbon materials for useful chemical production and reduction of greenhouse gas with biotechnology.The electrochemical properties of microorganisms on the carbon electrode were investigated by cyclic voltammetry (CV), linear sweep voltammetry, and electrochemical impedance spectroscopy (EIS) to elucidate the electron transfer mechanisms between the bacteria and the electrode surface [13,14]. These analyses provided information on how electro-active bacteria interact with the carbon electrode, and the appropriate range of applied potentials in BES [6,8]. For the first demonstration of electromethanogenesis, methane was...

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“…In BES-AD, slight EV is applied in order to induce the vital reactions [82], and as a consequence, DIET reaction, and the growth of DIET-capable species are stimulated, directly transferring electrons from EAB species to anode surface [83]. Table 3 shows the impact of various EV upon CH 4 from various wastes.…”

Section: Electrical Energy Input As Tool For Diet Pathway Stimulationmentioning

confidence: 99%

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Mostafa

Song

et al. 2020

Processes

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Since the observation of direct interspecies electron transfer (DIET) in anaerobic mixed cultures in 2010s, the topic “DIET-stimulation” has been the main route to enhance the performance of anaerobic digestion (AD) under harsh conditions, such as high organic loading rate (OLR) and the toxicants’ presence. In this review article, we tried to answer three main questions: (i) What are the merits and strategies for DIET stimulation? (ii) What are the consequences of stimulation? (iii) What is the mechanism of action behind the impact of this stimulation? Therefore, we introduced DIET history and recent relevant findings with a focus on the theoretical advantages. Then, we reviewed the most recent articles by categorizing how DIET reaction was stimulated by adding conductive material (CM) and/or applying external voltage (EV). The emphasis was made on the enhanced performance (yield and/or production rate), CM type, applied EV, and mechanism of action for each stimulation strategy. In addition, we explained DIET-caused changes in microbial community structure. Finally, future perspectives and practical limitations/chances were explored in detail. We expect this review article will provide a better understanding for DIET pathway in AD and encourage further research development in a right direction.

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Bioelectrochemical reduction of volatile fatty acids in anaerobic digestion effluent for the production of biofuels

Cited by 61 publications

References 31 publications

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Biologically activated graphite fiber electrode for autotrophic acetate production from CO₂in a bioelectrochemical system

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

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Bioelectrochemical reduction of volatile fatty acids in anaerobic digestion effluent for the production of biofuels

Cited by 61 publications

References 31 publications

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Microbial network for waste activated sludge cascade utilization in an integrated system of microbial electrolysis and anaerobic fermentation

Biologically activated graphite fiber electrode for autotrophic acetate production from CO2in a bioelectrochemical system

Enhanced Anaerobic Digestion by Stimulating DIET Reaction

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Product

Resources

About

Biologically activated graphite fiber electrode for autotrophic acetate production from CO₂in a bioelectrochemical system