In order to produce hydrogen gas in a way that is climate neutral, bacteria are added to forestry or household waste, using a method similar to biogas production. One problem with this production method is that hydrogen exchange is low, i.e. the raw materials generate little hydrogen gas.
Now, for the first time, researchers have studied a newly discovered bacterium that produces twice as much hydrogen gas as the bacteria currently used. The results show how, when and why the bacterium can perform its excellent work and increase the possibilities of competitive biological production of hydrogen gas.
"There are three important explanations for why this bacterium, which is called Caldicellulosiruptor saccharolyticus, produces more hydrogen gas than others. One is that it has adapted to a low-energy environment, which has caused it to develop effective transport systems for carbohydrates and the ability to break down inaccessible parts of plants with the help of enzymes. This in turn means it produces more hydrogen gas. The second explanation is that it can cope with higher growth temperatures than many other bacteria. The higher the temperature, the more hydrogen gas can be formed", summarises Karin Willquist, doctoral student in Applied Microbiology at Lund University. She will soon be presenting a thesis on the subject.
On the other hand, the bacterium does not like high concentrations of salt or hydrogen gas. These affect the signalling molecules in the bacterium and, in turn, the metabolism in such a way that it produces less hydrogen gas.
"But it is possible to direct the process so that salt and hydrogen gas concentrations do not become too high", points out Karin Willquist.
When hydrogen is used as an energy carrier, for example in car engines, water is the only by-product. However, because the hydrogen gas production itself, if it is carried out by a conventional method, consumes large amounts of energy, hydrogen gas is still not a very environmentally friendly energy carrier.
Reforming of methane or electrolysis of water are currently the most common ways to produce hydrogen gas. However, methane gas is not renewable and its use leads to increased carbon dioxide emissions. Electrolysis requires energy, usually acquired from fossil fuels, but also sometimes from wind or solar power. Hydrogen gas can also be generated from wind power, which is an environmentally friendly alternative, even if wind power is controversial for other reasons.
"If hydrogen gas is produced from biomass, there is no addition of carbon dioxide because the carbon dioxide formed in the production is the same that is absorbed from the atmosphere by the plants being used. Bio-hydrogen gas will probably complement biogas in the future", predicts Karin Willquist.
Today there are cars that run on hydrogen gas, e.g. the Honda FCX, even if they are few in number. The reason for this is that it is too expensive to produce hydrogen gas and there is no functioning hydrogen infrastructure.
"A first step towards a hydrogen gas society could be to mix hydrogen gas with methane gas and use the existing methane gas infrastructure. Buses in Malmö, for example, drive on a mixture of hydrogen gas and methane gas", says Karin Willquist.
Caldicellulosiruptor saccharolyticus was isolated for the first time in 1987 in a hot spring in New Zealand. It is only recently that researchers have really begun to realise the potential of the bacterium.
or more information, please contact Karin Willquist, doctoral student, Applied Microbiology, +46 (0)46 222 06 49, +46 (0)735 37 55 68, Karin.Willquist@tmb.lth.se,
Supervisor Ed van Niel, Senior Lecturer in Applied Microbiology, +46 (0)46 222 0619, Ed.van_Niel@tmb.lth.se.
Pressofficer Kristina Lindgärde; email@example.com; +46-709 75 35 00
Kristina Lindgärde | idw
Making fuel out of thick air
08.12.2017 | DOE/Argonne National Laboratory
‘Spying’ on the hidden geometry of complex networks through machine intelligence
08.12.2017 | Technische Universität Dresden
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
An interdisciplinary group of researchers interfaced individual bacteria with a computer to build a hybrid bio-digital circuit - Study published in Nature Communications
Scientists at the Institute of Science and Technology Austria (IST Austria) have managed to control the behavior of individual bacteria by connecting them to a...
Physicists in the Laboratory for Attosecond Physics (run jointly by LMU Munich and the Max Planck Institute for Quantum Optics) have developed an attosecond electron microscope that allows them to visualize the dispersion of light in time and space, and observe the motions of electrons in atoms.
The most basic of all physical interactions in nature is that between light and matter. This interaction takes place in attosecond times (i.e. billionths of a...
Transistors based on carbon nanostructures: what sounds like a futuristic dream could be reality in just a few years' time. An international research team working with Empa has now succeeded in producing nanotransistors from graphene ribbons that are only a few atoms wide, as reported in the current issue of the trade journal "Nature Communications."
Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the...
08.12.2017 | Event News
07.12.2017 | Event News
05.12.2017 | Event News
08.12.2017 | Life Sciences
08.12.2017 | Information Technology
08.12.2017 | Information Technology