Plant and process engineering

A high-load fermenter as a supplement to the established stirred tank fermenter could make biogas plants more economical. This is the conclusion reached by the Bio-Smart project of Münster University of Applied Sciences and the company PlanET Biogastechnik. This is because the high water content of residual materials such as liquid manure not only requires large fermentation tanks in conventional plants, but also a lot of heating energy.

Molds are not only a health risk. They are also important microbial cell factories in biotechnology. The first process of this kind was the fermentation of citric acid more than 100 years ago. In the present, numerous other acids, enzymes and pharmaceutically active molecules have been added. How productive these manufacturing processes are also depends on the spatial structure of the fungal tangles in the bioreactor. A German research team has now succeeded in analyzing these structures.

Paper or packaging usually consists of pulp obtained from wood. However, paper production is very energy-intensive. Moreover, wood grows only slowly and demand has increased in recent years, as the raw material has long since become an important source for sustainable products such as bio-based plastics. But there are alternatives: Cellulose can also be obtained from other plants such as grass.

Foamed plastics are frequently used for packaging. They are mostly made of polystyrene, polyethylene or polyurethane - and are thus ultimately based on petroleum. The production process is clearly not sustainable, and the situation is often no better at the product's end of life: After a single use, they are usually discarded - even if done correctly, foamed materials are rarely recycled today. Instead, they end up in thermal recycling.

Fiber composites made from bio-based raw materials are increasingly in demand in industry. They are set to replace materials previously based on glass or carbon fibers or even basalt or aramid fibers. The intention is to produce more sustainable products, because the previous variants are very energy-intensive, both in production and in recycling. Yet sustainability is not to be achieved at the expense of processability or material properties.

When one thinks of a robot, the first association is probably a machine made of metal - or for some perhaps even modern robots in plastic housing or even with artificial skin. But you probably don't associate muscles with the machine. An international team of researchers has now developed artificial muscles that enable robots to move. The special highlight: the muscles are biobased and biodegradable.

It is not only Bundesliga clubs that rely on artificial turf for their playing surfaces. Smaller clubs also prefer the low-maintenance and weather-independent material and are making the necessary investments. There are already around 9,000 artificial turf pitches in Germany. But these have so far been based on fossil raw materials and contribute to microplastics entering the environment. The European Chemicals Agency (ECHA) has calculated that artificial turf pitches in Europe are responsible for 16,000 tons of microplastics in the environment every year.

Bio-based - but not quite. That is often the case for sustainable building materials such as biofiber composites. Although natural fibers with excellent ecological and technical properties exist, resin is ultimately needed to turn them into the desired material. Until now, petroleum-based resin often had to be used because suitable sustainable alternatives are limited. Soon, things could be different: In the OrangeOil research project, which is funded by the German Federal Ministry of Economics and Technology, researchers are developing a bio-based epoxy resin.