Monday, 14 May 2012
These are mentioned in the water microbiology check, but what on earth are they?
They are Gram-positive anaerobic spore-forming bacteria in the shape of rods. In the method of detection, sulphite is reduced by the bacteria to sulphide at 37 deg C within 24 hours. The organisms form spores which are environmentally resistant and could be an indication of ground water contamination of drinking water. The important species within the group is Clostridium perfringens, often associated with fecal contamination.
Clostridia are everywhere, in soil, decaying vegetation, marine sediment, and the intestinal tract of humans and other vertebrates. Virtually every soil sample ever examined, with the exception of the sands of the Sahara desert, has been shown to contain C. Perfringens.