Pharmaceutical residues in waste water pose new challenges for municipal water treatment. Established methods are frequently found lacking when it comes to removing such substances. A treatment module developed at Fraunhofer IKTS provides a remedy and completely eliminates these harmful substances.
In Germany, approximately 38,000 tons of medicines, including hormones, antibiotics and antivirals, are consumed annually. Their residues are increasingly found in the waste water of conurbations. From there they also enter ground- and surface water.
Ususally they are difficult to remove with conventional sewage plant and water treatment technology. Two very worrying trends are associated with this: the increasing of both the spread of multiresistant microorganisms and fertility disorders.
With the help of electrochemical processes, pharmaceutical residues can be completely degraded. They are electrochemically converted at the anode of an electrolysis cell, leaving only carbon dioxide. However, the anodes made of boron-doped diamond with a price of currently approx. 16,000 € per square meter are much too expensive. Fraunhofer IKTS is pursuing two approaches in order to manufacture the electrodes more cost-efficiently and increase the degradation rates.
Cost-efficient anode materials in combination with ultrasound
On the one hand, an alternative noble-metal-free anode material of semiconducting mixed-oxide phases was developed. Tin-antimony oxide-based systems have proven to be particularly effective. With the same functionality and service life, they cost only one tenth compared to boron-doped diamond.
On the other hand, researchers at Fraunhofer IKTS cause the waste water to oscillate by means of ultrasound in order to intensify the mass transport at the electrode and thus reach even higher degradation rates. This is achieved by minimizing the thickness of the diffusion layer on the anode. The layer acts as a kind of reaction barrier and thus slows down their destruction.
Ceramic-based electrode-sonotrode module
Not only the process combination is sophisticated, but also the design of the corresponding electrode-sonotrode module. The innovative approach consists of pressing the ultrasonic sensors directly onto the ceramic electrode so that it vibrates like a spring. This greatly improves material transport to the electrode. This is made possible by ceramic materials and technologies.
Fraunhofer IKTS covers the entire technological chain – from the development of functional materials, screen printing of ultrasonic actuators, suitable joining technologies for contacting the electrode to systems integration. In addition, there is extensive know-how in the field of electrochemical process engineering, which forms the basis for the successful treatment of polluted waste water. These intertwined competences of a research institute are unique in Europe.
On a laboratory scale, a convincing proof of the function of the new electrode-sonotrode module has recently been provided and a patent application has been filed. “In view of the positive results, we now see upscaling as a realistic goal. An electrochemical reactor is being developed and tested on a technical scale for this purpose,“ says Dipl.-Chem. Hans-Jürgen Friedrich, head of Technical Electrolysis and Geothermal Energy group at Fraunhofer IKTS in Dresden.
In the future, the electrode-sonotrode module will also be used in other sectors, such as the destruction of nitroaromatics, plasticizers, herbicide residues or other toxic substances in commercial waste water. “Applications in the field of chemical synthesis and sensor technology are also focused,“ adds project manager Hans-Jürgen Friedrich.
At this year‘s IFAT, Fraunhofer IKTS presents its entire portfolio of efficient and environmentally friendly water treatment technologies on Booth 132 in Hall A3.
Dipl.-Chem. Katrin Schwarz | Fraunhofer Institute for Ceramic Technologies and Systems IKTS
3D technology lets us look into the distant past
20.05.2019 | Eberhard Karls Universität Tübingen
Dangerous pathogens use this sophisticated machinery to infect hosts
20.05.2019 | California Institute of Technology
Engineers at the University of Tokyo continually pioneer new ways to improve battery technology. Professor Atsuo Yamada and his team recently developed a...
With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists...
'Quantum technologies' utilise the unique phenomena of quantum superposition and entanglement to encode and process information, with potentially profound benefits to a wide range of information technologies from communications to sensing and computing.
However a major challenge in developing these technologies is that the quantum phenomena are very fragile, and only a handful of physical systems have been...
Working group led by physicist Professor Ulrich Nowak at the University of Konstanz, in collaboration with a team of physicists from Johannes Gutenberg University Mainz, demonstrates how skyrmions can be used for the computer concepts of the future
When it comes to performing a calculation destined to arrive at an exact result, humans are hopelessly inferior to the computer. In other areas, humans are...
Scientists develop a molecular recording tool that enables in vivo lineage tracing of embryonic cells
The beginning of new life starts with a fascinating process: A single cell gives rise to progenitor cells that eventually differentiate into the three germ...
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
20.05.2019 | Materials Sciences
20.05.2019 | Life Sciences
20.05.2019 | Power and Electrical Engineering