Increasing methane content in biogas and simultaneous value added product recovery using microbial electrosynthesis

Das, Sovik; Chatterjee, Pritha; Ghangrekar, Makarand M.

doi:10.2166/wst.2018.002

Cited by 51 publications

(14 citation statements)

References 19 publications

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“…Many reports examined the synthesis process of methane in both pure and mixed culture methanogenic bacteria. ,− A mixed culture methanogenic microorganism was employed for the synthesis of CH 4 by using various raw materials. For example, Marshall et al used brewery effluent waste to supplement a biocatholyte in MES.…”

Section: Biological Methods Of Carbon Dioxide (Co2) Sequestrationmentioning

confidence: 99%

Review and Perspectives of Emerging Green Technology for the Sequestration of Carbon Dioxide into Value-Added Products: An Intensifying Development

Kumar

Jujjavarapu

2023

Energy Fuels

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Global warming has emerged as a major problem for humanity in this anthropocentric period. The constantly rising amount of carbon dioxide (CO 2 ) in the atmosphere has caused global warming, which has caused a series of changes in the Earth's climate and weather systems. Rapid anthropogenic activity such as industrialization and urbanization has led to increasing the CO 2 level in the environment. CO 2 is captured and utilized as the carbon source for synthesizing various value-added products through physical and chemical methods. However, the physical and chemical techniques do not provide an ecologically friendly or costeffective procedure. Some advanced innovative, environmentally friendly green methods based on photosynthesis, microbial electrosynthesis, and gas fermentation processes can help to clean the atmosphere by sequestering CO 2 and producing value-added products from CO 2 . This approach has the potential to reduce greenhouse gas emissions, increase productivity, and create new economic opportunities. In this review, we found that the photosynthetic process has a high capacity for CO 2 sequestration. In contrast, the microbial electrosynthesis and gas fermentation processes have a high efficiency of value-added product synthesis. These biological CO 2 sequestration technologies contribute to the sustainability of the global carbon process. However, each method has its own strengths and weaknesses, and the choice of method will depend on the specific goals and resources of a sequestration project. This report also defined the various influencing factors of photosynthetic, microbial electrosynthesis, and gas fermentation processes for optimized development of these technologies, while challenges and future directions are also discussed.

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Section: Biological Methods Of Carbon Dioxide (Co2) Sequestrationmentioning

confidence: 99%

Review and Perspectives of Emerging Green Technology for the Sequestration of Carbon Dioxide into Value-Added Products: An Intensifying Development

Kumar

Jujjavarapu

2023

Energy Fuels

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“…As observed in earlier studies with small-scale reactors, the acetic acid titer and rates remained within the same range. 26,38 The production rate is an important parameter for scaling up any process. The highest production rate of 0.26 ± 0.01 g/L/ day was observed at −0.66 mA/cm 2 applied reduction current density and 2 L/d biogas feed rate.…”

Section: Performance Analysis Of the Large-scale Mes Reactors For Bio...mentioning

confidence: 99%

Scalability of the Microbial Electro-acetogenesis Process for Biogas Upgradation: Performance and Technoeconomic Assessment of a Liter-Scale System

Roy,

Saich,

Patil

2023

Energy Fuels

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Biogas is a promising sustainable alternative energy source, but its high CO 2 content reduces its energy density and calorific value, making it unsuitable for use as a fuel or for other applications. Its upgradation through CO 2 removal is thus required to increase its CH 4 content and application prospects. Microbial electrosynthesis (MES) is emerging as a promising technology for this purpose since it offers CO 2 utilization rather than a mere removal of this greenhouse gas. Though MES has been reported to be effective in upgrading biogas in small laboratory-scale reactors, its scalability and economic feasibility remain to be assessed. To this end, this study aimed to validate biogas upgradation via the microbial electro-acetogenesis process at different applied currents in liter-scale systems and assess its technoeconomic prospects. At a fixed current density of −0.5 mA/cm 2 in galvanostatically controlled MES reactors fed continuously with biogas at a 1 L/d rate, the methane content increased from an initial 56 ± 2 to 86 ± 6% in upgraded biogas. The conversion of CO 2 into acetic acid (3.6 ± 0.6 g/L) by the Acetobacterium-dominated mixed-microbial culture resulted in an efficient biogas upgradation. At an E cell of 2.6 V, the Coulombic and energy efficiencies of the process considering the acetic acid product were 82 ± 16 and 36 ± 7%, respectively. Though the low applied electric current density (e.g., −0.66 mA/cm 2 ) affected biogas upgradation, it resulted in the mixture of CH 4 and H 2 (i.e., hythane), also a potential fuel. The technoeconomic analysis considering the operational costs suggests the economic impracticability of the demonstrated process at low acetic acid titers, and capital expenses remain the major bottleneck in realizing the near future practical implementation of this technology.

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“…The technology of MES is an evolving one in bioelectrochemical research; it utilizes the electrons resulting from the cathode to reduce CO 2 and other compounds into different chemicals [125]. The benefits of MES include not only CO 2 sequestration and chemical production, but also address the harvesting, storing, and circulation difficulties linked with energy, as the electrons harvested can be from any sustainable source [126].…”

Section: Valuables Recovered Through Mes Using Dairy Wastewatermentioning

confidence: 99%

Dairy Wastewater as a Potential Feedstock for Valuable Production with Concurrent Wastewater Treatment through Microbial Electrochemical Technologies

2022

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A milk-processing plant was drafted as a distinctive staple industry amid the diverse field of industries. Dairy products such as yogurt, cheese, milk powder, etc., consume a huge amount of water not only for product processing, but also for sanitary purposes and for washing dairy-based industrial gear. Henceforth, the wastewater released after the above-mentioned operations comprises a greater concentration of nutrients, chemical oxygen demand, biochemical oxygen demand, total suspended solids, and organic and inorganic contents that can pose severe ecological issues if not managed effectively. The well-known processes such as coagulation–flocculation, membrane technologies, electrocoagulation, and other biological processes such as use of a sequencing batch reactor, upflow sludge anaerobic blanket reactor, etc., that are exploited for the treatment of dairy effluent are extremely energy-exhaustive and acquire huge costs in terms of fabrication and maintenance. In addition, these processes are not competent in totally removing various contaminants that exist in dairy effluent. Accordingly, to decrease the energy need, microbial electrochemical technologies (METs) can be effectively employed, thereby also compensating the purification charges by converting the chemical energy present in impurities into bioelectricity and value-added products. Based on this, the current review article illuminates the application of diverse METs as a suitable substitute for traditional technology for treating dairy wastewater. Additionally, several hindrances on the way to real-world application and techno-economic assessment of revolutionary METs are also deliberated.

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Increasing methane content in biogas and simultaneous value added product recovery using microbial electrosynthesis

Cited by 51 publications

References 19 publications

Review and Perspectives of Emerging Green Technology for the Sequestration of Carbon Dioxide into Value-Added Products: An Intensifying Development

Review and Perspectives of Emerging Green Technology for the Sequestration of Carbon Dioxide into Value-Added Products: An Intensifying Development

Scalability of the Microbial Electro-acetogenesis Process for Biogas Upgradation: Performance and Technoeconomic Assessment of a Liter-Scale System

Dairy Wastewater as a Potential Feedstock for Valuable Production with Concurrent Wastewater Treatment through Microbial Electrochemical Technologies

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