Brandenburg University of Technology Cottbus-Senftenberg;
Faculty of Environment;
Process Engineering;
Biotechnology and Chemistry;
Department of Soil Protection and Recultivation;
Konrad-Wachsmann-Allee 6;
Cottbus 03046;
Germany;
anion; exchange; batch; technique; citric; acid; flow-through; reactor; humic; acid; ligand; exchange; phosphate; phosphorus; recovery;