Search Results for: Machine for testing the mechanical properties of metal
european union etymology see also references overview[ edit ] before the th century, sewers usually discharged into a body of water such as a stream, river, lake, bay, or ocean. there was no treatment, so the breakdown of the human waste was left to the ecosystem . today, the goal is that sewers route
organic matter of sewage is measured by determining its biological oxygen demand (bod) or the chemical oxygen demand (cod). pathogens[ edit ] sewage contains human feces , and therefore often contains pathogens of one of the four types: [ ] [ ] bacteria (for example salmonella , shigella , campylobacter...
https://en.wikipedia.org/wiki/Sewage