Sewer gas Sewer gas Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential
William Galloway (mining engineer) Galloway had to attend as mining inspector. By 1923 he followed his family tradition by becoming an owner/director of collieries. He became the chairman and a director of the East Kent Colliery Company and director of the Snowdown Colliery. In 1870, Galloway began investigations into the cause of explosions in dry mines, and became convinced that the cause was coal dust as well as fire damp. He was called on, as a mining inspector, to investigate the causes of between 60 and 80 explosions in Scottish mines and it became his life's work to find ways to reduce the risk