High yield hydrogen production in a single-chamber membrane-less microbial electrolysis cell

2010 ◽  
Vol 61 (3) ◽  
pp. 721-727 ◽  
Author(s):  
Yejie Ye ◽  
Liyong Wang ◽  
Yingwen Chen ◽  
Shemin Zhu ◽  
Shubao Shen
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Hydrogen Concentration ◽  
Current Density ◽  
Production Performance ◽  
Electrolysis Cell ◽  
Hydrogen Production Rate ◽  
High Hydrogen ◽  
Single Chamber ◽  
Hydrogen Recovery

The single-chamber membrane-less MEC exerted much better hydrogen production performance while given higher applied voltages than it did at lower. High applied voltages that could shorten the reaction time and the exposure of anode to air for at least 30 min between cycles can significantly suppress methanogen and increase hydrogen production. At an applied voltage of 1.0 V, a hydrogen production rate of 1.02 m3/m3/day with a current density of 5.7 A/m2 was achieved. Cathodic hydrogen recovery and coulombic efficiency were 63.4% and 69.3% respectively. The hydrogen concentration of mixture gas produced of 98.4% was obtained at 1.0 V, which was the best result of reports. The reasons that such a high hydrogen concentration can be achieved were probably the high electrochemical activity and hydrogen production capability of the active microorganisms. Increase in substrate concentrations could not improve MEC's performance, but increased the reaction times. Further, reactor configuration and operation factors optimisation should be considered to increase current density, hydrogen production rate and hydrogen recovery.

Evaluation of low-cost cathode catalysts for high yield biohydrogen production in microbial electrolysis cell

2011 ◽  
Vol 63 (3) ◽  
pp. 440-448 ◽  
Author(s):  
L. Wang ◽  
Y. Chen ◽  
Y. Ye ◽  
B. Lu ◽  
S. Zhu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Hydrogen Production ◽  
Production Rate ◽  
Coulombic Efficiency ◽  
Electrical Energy ◽  
Hydrogen Gas ◽  
Electrolysis Cell ◽  
Hydrogen Production Rate ◽  
Hydrogen Recovery ◽  
Microbial Electrolysis

As an ideal fuel due to the advantages of no pollution, high combustion heat and abundant sources, hydrogen gas can be produced from organic matter through the electrohydrogenesis process in microbial electrolysis cells. But in many MECs, platinum is often used as catalyst, which limits the practical applications of MECs. To reduce the cost of the MECs, Ni-based alloy cathodes were developed by electrodepositing. In this paper hydrogen production using Ni-W-P cathode was studied for the first time in a single-chamber membrane-free MEC. At an applied voltage of 0.9 V, MECs with Ni-W-P cathodes obtained a hydrogen production rate of 1.09 m3/m3/day with an cathodic hydrogen recovery of 74%, a Coulombic efficiency of 56% and an electrical energy efficiency relative to electrical input of 139%, which was the best result of reports in this study. The Ni-W-P cathode demonstrated a better electrocatalytic activity than the Ni-Ce-P cathode and achieved a comparable performance to the Pt cathode in terms of hydrogen production rate, Coulombic efficiency, cathodic hydrogen recovery and electrical energy efficiency at 0.9 V.

High hydrogen production rate in a submerged membrane anaerobic bioreactor

2017 ◽  
Vol 42 (39) ◽  
pp. 24656-24666 ◽  
Author(s):  
Alexandre Noblecourt ◽  
Gwendoline Christophe ◽  
Christian Larroche ◽  
Gaëlle Santa-Catalina ◽  
Eric Trably ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Hydrogen Production Rate ◽  
High Hydrogen ◽  
Anaerobic Bioreactor

Effect of Substrate Concentration on Hydrogen Production from Fermentation of Sugar Wastewater

2013 ◽  
Vol 409-410 ◽  
pp. 235-241
Author(s):  
Zheng Zhou ◽  
Kai Liu ◽  
Qiu Yang He
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Substrate Concentration ◽  
Anaerobic Fermentation ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Gas Production ◽  
Production Performance ◽  
Volatile Acid ◽  
Hydrogen Production Rate

The biological hydrogen production by the sugar wastewater is an effective way to achieve the reclamation. In this paper, the effect of substrate concentration on the hydrogen production is discussed through employing the self-made continuous flow anaerobic fermentation hydrogen production reactor, taking the sludge in urban sewage treatment plant as the inoculated sludge and the simulated sugar wastewater as the substrate. The experimental results show that the best hydrogen production effect can be obtained when the temperature is (37±1) °C, HRT is 7h, the water alkalinity is around 530mg/L and the substrate concentration is 5000mg/L, namely the organic load is 60kgCOD/(m3·d). The volumes of gas production and hydrogen production both reach the maximum. The average values are respectively 36.2L/d and 21.8L/d. The obtained hydrogen production rate is 0.93kgCOD/(m3·d). During the whole process, the proportion of volatile acid composition remains stable, which is the butyric acid-type fermentation. When the concentration of COD is increased to 6000-8000mg/L, the ability of hydrogen production of system will be significantly dropped due to the increase of pH of system. The hydrogen production performance can be restored through artificially and timely lowering the water alkalinity. However, the hydrogen production rate will be decreased compared to the previous situation.

Improvement of Organic Loading Rate on Hydrogen Production Using Continuous Stirred Tank

2013 ◽  
Vol 805-806 ◽  
pp. 1382-1386
Author(s):  
Jian Hui Zhao ◽  
Ning Li ◽  
Yong Feng Li
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Gas Production ◽  
Stirred Tank ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Hydrogen Production Rate ◽  
Brown Sugar ◽  
High Hydrogen ◽  
Continuous Stirred Tank

The influence of organic loading rates (OLRs) on the production of fermentation hydrogen was investigated in a continuous stirred tank reactor (CSTR) with brown sugar water as the fermentation substrate, and sewage sludge as the initiation of reaction. Six OLRs were examined, ranging from 12 kg/m3·d to 32 kg/m3·d. The biogas and hydrogen production rates continuously increased with increasing OLR (12 kg/m3·d to 32 kg/m3·d).It reached a maximum production rate of 18.6L/d and a hydrogen production rate of 6.4L/d at OLR= 32 kg/m3·d. Compared with the initial 12kg/m3·d, gas production improved by 89% and 87%, respectively. During system operation, the reactor could maintain a high hydrogen production rate of ethanol-type fermentation by adding a certain amount of NaOH in the reactor to regulate the pH level.

scholarly journals Product Inhibition of Biological Hydrogen Production in Batch Reactors

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1318 ◽  
Author(s):  
Subhashis Das ◽  
Rajnish Kaur Calay ◽  
Ranjana Chowdhury ◽  
Kaustav Nath ◽  
Fasil Ejigu Eregno
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Hydrogen Concentration ◽  
Microbial Growth ◽  
Batch Reactor ◽  
Product Inhibition ◽  
Batch Reactors ◽  
Hydrogen Production Rate ◽  
Biological Hydrogen Production ◽  
Fermentative Hydrogen Production

In this paper, the inhibitory effects of added hydrogen in reactor headspace on fermentative hydrogen production from acidogenesis of glucose by a bacterium, Clostridium acetobutylicum, was investigated experimentally in a batch reactor. It was observed that hydrogen itself became an acute inhibitor of hydrogen production if it accumulated excessively in the reactor headspace. A mathematical model to simulate and predict biological hydrogen production process was developed. The Monod model, which is a simple growth model, was modified to take inhibition kinetics on microbial growth into account. The modified model was then used to investigate the effect of hydrogen concentration on microbial growth and production rate of hydrogen. The inhibition was moderate as hydrogen concentration increased from 10% to 30% (v/v). However, a strong inhibition in microbial growth and hydrogen production rate was observed as the addition of H2 increased from 30% to 40% (v/v). Practically, an extended lag in microbial growth and considerably low hydrogen production rate were detected when 50% (v/v) of the reactor headspace was filled with hydrogen. The maximum specific growth rate (µmax), substrate saturation constant (ks), a critical hydrogen concentration at which microbial growth ceased (H2*) and degree of inhibition were found to be 0.976 h−1, 0.63 ± 0.01 gL, 24.74 mM, and 0.4786, respectively.

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