Trade fair / March 08, 2022 - March 10, 2022
Filtration and separation techniques are basic process operations. We show how these can be carried out with ceramics even in high-temperature processes and chemically aggressive environments.
Hall 7, Booth L2
Hot gas cleaning with ceramic filter media
Cleanable ceramic filter media have proven themselves in hot gas cleaning at operating temperatures of 800 °C and above. Current projects deal with the hot gas dedusting of exhaust gases from the steel and lime industry in order to separate CO2. The Fraunhofer IKTS has developed a new approach for this. By combining hot gas filtration with ceramic filters and CO2 separation with nanoporous membranes, hot and dust-laden exhaust gases can be used for the first time to simultaneously recover CO2 as raw material and recuperate heat.
Further new process developments at IKTS are aimed at the energy-efficient and selective separation of recyclable materials from hot gas processes by means of filtration. This allows phosphate-containing ashes to be recovered from the sewage sludge mono-combustion process and heavy metal to be removed at the same time. The concept is based on a modification of the ashes during combustion and the subsequent separation of the reaction products. The separation of the substances is carried out by hot gas filtration and uses the different volatilities of the reaction products formed.
Compact hybrid systems for disinfection of waste water and elimination of trace substances
Trace substances of anthropogenic origin pose new challenges for operators of water treatment plants. Previous technological solutions are very cost-intensive and a complete and residue-free degradation of such substances is usually not possible. In cooperation with partners, Fraunhofer IKTS is currently developing compact, robust and self-cleaning wastewater treatment systems that can be used both at the “point-of-use” as the last treatment step before consumption or at the “point-of-emission” for the treatment of polluted partial streams. For this purpose, ceramic microfiltration flat membranes are extended with a photocatalysis zone based on titanium dioxide and the filtrate is irradiated with energy-efficient UV-A LEDs. This allows particles to be separated, waste water to be disinfected and organic trace substances such as pharmaceuticals, odors and flavor formers to be completely degraded in a single step. Possible areas of application are the treatment of hospital waste water (yellow water from radiology), the removal of trace substances from drinking water before further use (beverage production), the disinfection of cooling tower water or the treatment of organically contaminated industrial and municipal waste water for reuse (circulation water in aquacultures).
Centralized looping of wastewater to drinking water
ecentralized wastewater treatment plants already exist, but they are usually based on biological processes, which limits their performance and availability. Certain constituents, such as drug residues, are not degraded by them. In addition, the systems cannot be switched on and off at will and are therefore not very flexible. autartec® water treatment systems do not have these problems, as they are based on the combination of purely physical-chemical processes, such as filtration, electrolysis and photocatalysis. The development goal is now to develop reactors and process chains in which these methods can be combined in a very confined space with high energy efficiency to treat wastewater into drinking water. This is made possible by the use of functionalized and highly stable ceramic materials and components, such as membrane filters and cellular molded bodies. Results show that these key components can be used very effectively.