Microbial precipated nanocrystals of bio-palladium and biomanganese oxides will be used as an general degradation technology for halogenated compounds. Bio-palladium will dehalogenetae the contaminants, while bio-manganaseoxides will further oxidise the basic organic structure. Hexachlorocyclohexane, polychlorinated and polybrominated biphenyls will be model compounds. The final aim is to develop a reactor with simultaneous reductive and oxidative processes to remove halogenated organic chemicals.