Abstract: A surface protector is disclosed that is adapted to be removably affixed to at least a portion of a surface-contacting layer of a mobile entity. The surface protector may include a protective cover corresponding to a surface-contacting layer of the mobile entity, the protective cover defining first and second opposing sides. A first fastening element may be disposed on the first side of the protective cover for attaching the first side of the protective cover to the surface-contacting layer of the mobile entity. The protector may aid in preventing a transfer of substances located on the mobile entity from a first environment to a second environment. In alternative aspects of the invention, the surface protector may be used to protect the mobile entity itself from unwanted substances coming into contact with the mobile entity.

Abstract: A method for carrying out a biochemical reaction with a culture of microorganisms is performed in a cavity formed in a subterranean formation to produce combustible hydrocarbon gases. The method is especially suitable for the conversion of alkali-oxidized or hydrolyzed coal, such as lignite, to methane. The method may be performed in the cavity as a continuously stirred tank reaction, or plug flow or as a staged reaction. The method may also be done as an anaerobic fixed film process using particles as an anaerobic filter, as a sludge blanket, or as an expanded bed process.