scholarly journals Selective Removal of Water Generated during Hydrogenotrophic Methanation from Culture Medium Using Membrane Distillation

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4130 ◽  
Author(s):  
Okkyoung Choi ◽  
MinJeong Kim ◽  
Youngwook Go ◽  
Moon-Gi Hong ◽  
Bomin Kim ◽  
...  
Keyword(s):  
Methane Production ◽  
Culture Medium ◽  
Specific Growth ◽  
Bubble Column ◽  
Membrane Distillation ◽  
Bubble Column Reactor ◽  
Good Comparison ◽  
Different Types ◽  
Liquid Mass Transfer ◽  
Methanation Activity

Methane production was carried out in two different types of reactors using a thermophilic and hydrogenotrophic methanogen, Methanothermobacter sp. KEPCO-1, which converts hydrogen and carbon dioxide into methane at 60 °C. The two reactors used for methane production were stirred-tank reactor (ST) and a bubble column reactor (BC), which were selected because they can provide a good comparison between the medium agitation type and gas–liquid mass transfer. The specific growth rate of KEPCO-1 in the ST and BC was 0.03 h−1 and 0.07 h−1, respectively. The methane conversion rate increased to 77.8 L/L/d in the ST and 19.8 L/L/d in the BC. To prevent the dilution of nutrients in the medium by the water generated during the hydrogenotrophic methanation reaction, a membrane distillation (MD) process was applied to selectively remove water from the culture medium. The MD process selectively removed only water from the medium. Fouling by KEPCO-1 had a negligible effect on flux and showed a high removal performance flux of 16.3 ± 3.1 L/m2/h. By operating the MD process in conjunction with the hydrogenotrophic methanation process, it is possible to prevent the dilution of the nutrients in the medium by the water generated during the methanation process, thereby maintaining stable microbial growth and methanation activity.

Performance evaluation and effect of biogas circulation rate of a bubble column for biological desulfurization

2012 ◽  
Vol 66 (9) ◽  
pp. 1914-1922 ◽  
Author(s):  
Takuro Kobayashi ◽  
Kai-Qin Xu ◽  
Yu-You Li ◽  
Yuhei Inamori
Keyword(s):  
Mass Transfer ◽  
Bubble Column ◽  
Removal Rate ◽  
Mass Transfer Rate ◽  
Circulation Rate ◽  
Bubble Column Reactor ◽  
Sulfate Production ◽  
Liquid Mass ◽  
Batch Tests ◽  
Liquid Mass Transfer

Biological desulfurization using a bubble column reactor was investigated in a continuous biogas treatment. Rapid biogas circulation between the digester and the bubble column for biological desulfurization was used to stimulate the gas–liquid mass transfer of H2S. A positive correlation between the biogas circulation rate and H2S removal rate was observed. Moreover, the increase in the circulation rate stimulated the O2 mass transfer, eventually translating into an increase in sulfate production from the oxidation of H2S. Throughout the continuous experiment, the reactor retained sufficient levels of sulfide-oxidizing bacteria. A comparison of the results of the continuous biogas treatment and batch tests suggests that the gas–liquid mass transfer rate of H2S was the rate-limiting step in the biological desulfurization in the reactor, indicating that the mass transfer efficiency of H2S needs to be improved to enhance the desulfurization performance.

Simulation of Hydrodynamic Conditions of a Photobioreactor for Microalgae Cultivation

2014 ◽  
Vol 592-594 ◽  
pp. 2427-2431 ◽  
Author(s):  
Sushovan Chatterjee ◽  
Sanjoy Paul
Keyword(s):  
Growth Rate ◽  
Bubble Column ◽  
Bubble Column Reactor ◽  
Microalgae Cultivation ◽  
Mixing Rate ◽  
Design Modification ◽  
Column Reactor ◽  
Different Types ◽  
The Cost ◽  
Proper Condition

Under optimum environmental conditions, microalgae are able to accumulate significant amounts of lipids within diminutive span. They are therefore established as promising candidates for the production of biodiesel. In order to develop this, and also to cut down the cost parameter involving the production of biodiesel from algae, the growth rate of algae has to be enhanced. To maintain the proper condition for their growth, closed cultivation is the best option for which different types of reactor are used. Bubble column reactor, is one among them, where the mixing rate of algae with nutrients, growth rate increases. This paper reported the design modification of spiral column reactor which will have better mixing rate than conventional bubble column reactor in turn more mass transfer due to more turbulence which can be seen by analyzing the turbulence kinetic energy against radius for both the reactors, for that CFX solver is been used.

scholarly journals Gibberellic Acid Production by Different Fermentation Systems Using Citric Pulp as Substrate/Support

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Juliana de Oliveira ◽  
Cristine Rodrigues ◽  
Luciana P. S. Vandenberghe ◽  
Marcela C. Câmara ◽  
Nelson Libardi ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Orange Juice ◽  
Fusarium Moniliforme ◽  
Bubble Column ◽  
Gibberella Fujikuroi ◽  
Bubble Column Reactor ◽  
Semisolid State ◽  
Substrate Support ◽  
Different Types ◽  
Citric Pulp

Gibberellic acid (GA3) is an important phytohormone, a member of gibberellins family, which acts as a promoter and regulator of plant growth. This study aimed to evaluate GA3 production by Fusarium moniliforme LPB03 and Gibberella fujikuroi LPB06 using different techniques of fermentation, solid state fermentation (SSF), submerged fermentation (SmF), and semisolid state fermentation (SSSF), and different types of bioreactors. In all techniques, citric pulp (CP), a subproduct obtained from the extraction of orange juice, was employed as the substrate/support. GA3 production by SSF reached 7.60 g kg−1 and 7.34 g kg−1 in Erlenmeyer flasks and column bioreactors, respectively. For SmF, the highest concentration of GA3 obtained was 236.00 mg L−1 in Erlenmeyer flasks, 273.00 mg L−1 in a 10 L stirred tank reactor (STR), and 203.00 mg L−1 in a 1.5 L bubble column reactor (BCR). SSSF was conducted with a CP suspension. In this case, GA3 concentration reached 331.00 mg L−1 in Erlenmeyer flasks and 208 mg L−1 in a BCR. The choice of the fermentation technique is undoubtedly linked to the characteristics and productivity of each process. The methods studied are inexpensive and were found to produce good proportions of GA3, making them suitable for several applications.

Continuous degradation of BTEX in landfill gas by the UV-Fenton reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1452-1459 ◽  
Author(s):  
Luchun Yan ◽  
Jiemin Liu ◽  
Zhenhua Feng ◽  
Peng Zhao
Keyword(s):  
Fenton Reaction ◽  
Bubble Column ◽  
Landfill Gas ◽  
Bubble Column Reactor ◽  
Gas Treatment ◽  
Waste Gas ◽  
Mass Transfer Efficiency ◽  
Waste Gas Treatment ◽  
P Application ◽  
Liquid Mass Transfer

Application of the UV-Fenton reaction in waste gas treatment with enhanced gas–liquid mass transfer efficiency using a bubble column reactor.

Gas-liquid mass transfer coefficient of methane in bubble column reactor

2015 ◽  
Vol 32 (6) ◽  
pp. 1060-1063 ◽  
Author(s):  
Jaewon Lee ◽  
Muhammad Yasin ◽  
Shinyoung Park ◽  
In Seop Chang ◽  
Kyoung-Su Ha ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Bubble Column ◽  
Bubble Column Reactor ◽  
Column Reactor ◽  
Liquid Mass ◽  
Liquid Mass Transfer
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