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. 1980 Mar 1;21(1):43–54. doi: 10.1186/BF03546899

The Effect of Cadmium on Indicator Bacteria in Sewage

Inverkan av kadmium på auloppsvattens indikatorbakterier.

H Korkeala 1,✉, J Hirn 1
PMCID: PMC8317761  PMID: 6247900

Abstract

The effect of cadmium (Cd) on the number of different faecal indicator bacteria in sewage, and on species composition of different indicator bacteria, was studied. Different amounts of Cd were added to aliquots of a sewage sample, and after 0, 4% and 24 h of Cd exposure at 20°C conforms, faecal coliforms, faecal streptococci and Clostridium perfringens were enumerated by the membrane filter method.

The Cd-induced reduction in the number of coliforms and faecal coliforms during exposure was found to be greater than the decrease in the number of faecal streptococci. In the case of C. perfringens the Cd concentrations used produced no observable effect on the cell number. The addition of Cd changed the faecal coliforms and faecal streptococci density relationship. Escherichia coli seems to be more resistant to Cd than other coliforms and Streptococcus faecalis var. liquefaciens and Streptococcus durans more resistant to Cd than other faecal streptococci. No influence of Cd on gas production by faecal coliforms was observed.

Faecal streptococci and C. perfringens seem to be better indicator bacteria than coliforms and faecal coliforms in evaluating the hygienic quality of Cd polluted sewage.

Keywords: coliforms, faecal coliforms, faecal streptococci, Clostridum perfringens

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