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
Holditch Colliery disaster Holditch Colliery disaster The Holditch Colliery disaster was a coal mining accident on 2 July 1937, in Chesterton, Staffordshire, England, in which 30 men died and eight were injured. It was caused due to a fire and subsequent explosions, and was exacerbated by a decision from management to risk the lives of mine workers to try to save the coal seam. Archaeologists believe that the area itself was mined as long ago as Roman times. Holditch Colliery, also known as Brymbo Colliery, opened in 1912, and was one of a number of coal mines in Staffordshire. It was located around