Abstract: The invention relates to a method for immobilising bacteria in a material permeable to the bacteria, in particular a geological body, comprising forming a first zone comprising the bacteria in the material and allowing the first zone to move through at least part of the material; forming a second zone comprising an effective amount of a flocculating agent to the material and allowing the second zone to move through at least part of the material, wherein the zones are allowed to move such that the zones become at least partially overlapping and at least part of the bacteria flocculate, thereby becoming immobilised.

Abstract: A process is described for removing noxious compounds such as hydrocarbons which may or may not contain halogen and/or may or may not be aromatic, from solids (soil), water or gas, according to which process the solid, the water or the gas is treated with a complex of a transition metal and an alkaline polyamine in the presence of a peroxide. The complex is, for example, a complex of iron chloride and 1,4,7-trimethyl-1,4,7-triazonane. The peroxide is preferably electrochemically produced hydrogen peroxide.