Abstract: In order to clean a surface (A) located in a hostile medium, use is made of a bush hammer (34) mounted on a remotely controlled vehicle (32). The waste produced by the bush hammer (34) is directly collected by a collecting pipe (12) connected to an exhauster (14). Cyclone separators (22, 24), an electostatic filter (26) and absolute filters (28, 30) arranged in this order on the collecting pipe recover the waste in decreasing size order. The cyclone separators are mounted on two compartments (76, 78) formed in a vessel (80) and each equipped with devices (90, 92, 100, 102, 106, 108) making it possible to inject into the compartments a waste treatment product and to recover the same after filtering. A container (120) is also placed beneath the electrostatic filter (26).

Abstract: A high pressure cleaner comprises a cleaning device (10) and an effluent recovery device (12). The cleaning device (10) is mainly constituted by a cleaning head (20) having a central chamber (44) into which a nozzle (26) sprays a high pressure cleaning liquid, the effluents being recovered in a peripheral chamber (46) connected to a decanter (54) of the recovery device (12). The actual decanter (54) is connected to an exhauster (72) across a liquid-gas separator (60) and filters (70). The liquid phase of the effluents is periodically recovered by a tube (80) immersed in the decanter (54) and connected to a hydroejector (82). The solid phase of the effluents is held back by a filter (92) surrounding the tube (80).