Most existing in-lake methods used to minimize the remobilization of redox-sensitive compounds from sediments are costly and limited in their effectiveness. Therefore, new approaches for this problem are needed. We describe electrochemically initiated transformation processes of iron and manganese, resulting in their immobilization in the sediment. This process could possibly be applied to prevent remobilization of phosphate from lake sediments. With electrodes positioned 3 cm in the sediment and 7 cm above the sediment-water interface, an electrochemically controlled redox-and pH-"barrier" was constructed. By means of laboratory exper- Aquatic Sciencesiments in columns filled with sediment and water from a reservoir, we demonstrated the possibility to fix and concentrate Fe and Mn under specific conditions in the sediment, or if required, to mobilize and drain them in concentrated solution. The behaviors of these metals were studied by simultaneous measurements of their concentrations, pH-, E h -values, and O 2 -concentration at the interface and in the water with and without current influence. The results show that soluble species can be transported and concentrated in an electric field. Iron and manganese can be prevented from being released from the sediments by sustainable in-situ fixation.

No abstract

No abstract

No abstract

Im Zuge des Wandels zur Elektromobilität steht die Nutzung von Batteriezellen als Energiespeicher vor einem exponentiellen Wachstum. Ziel in Forschung und Industrie ist es, den gesamten Lebenszyklus dieser Batteriezellen vor dem Hintergrund globaler Nachhaltigkeitsziele zu gestalten und die notwendige Rohstoffversorgung sicherzustellen. Hierbei kommt der Etablierung leistungsfähiger Recyclingtechnologien eine zentrale Rolle zu. Insbesondere besteht Forschungsbedarf in der Weiterentwicklung von Prozessrouten nach technologischen, ökologischen, wirtschaftlichen und sozialen Kriterien. Das Kompetenzcluster Recycling & Grüne Batterie (greenBatt) adressiert diese Herausforderungen in 15 Forschungsprojekten. Dieser Beitrag stellt übergreifende Lösungsansätze und Projekthighlights vor.