Iron oxide or iron hydroxide containing materials are applied in various water and gas cleaning applications based on adsorption processes. The removal of arsenate from contaminated ground or industrial waste water is just one generally known example. Commercially available adsorbents are either synthetically produced iron hydroxides or based on iron containing by-products from drinking water treatment. Advantages of these products are defined chemical and physical properties as well as high loading capacities. However, the availability of the raw materials is limited which leads to higher costs.
As a result of the termination of open cast brown coal mining in the eastern part of Germany (Lusatian fields) serious environmental problems (contamination of surface water bodies, e.g. river Spree) are caused by mobilized iron and sulphate containing compounds. Therefore mining water is treated producing several millions of m3 iron hydroxide containing sludge as by-product every year.
Investigating the possibilities to use this residues as raw material for the production of adsorbents was the focus of a joint research project. Several agglomeration processes as well as the application of various additives or binders were compared with the objective to obtain microstructured agglomerates with a high mechanical strength, a defined particle size distribution and a large external and internal surface area resulting in an optimum loading capacity.
Session: L9 - Depth Filtration and Adsorption - Applications
Day: 14 March 2018
Time: 13:00 - 14:15 h