Full-scale studies of factors related to coliform regrowth in drinking water

Article Abstract:

The regrowth of coliform bacteria in treated drinking water is affected by filtration, disinfectant type and content, assimilable organic carbon (AOC) content and temperature. A survey of 31 water samples in North America shows that coliform contamination is more likely in water that is unfiltered or has a temperature above 15 degree celsius. Free-chlorinated water with an AOC content above 100 micro-g/liter has a higher bacterial content. Water systems with a free-chlorine content above 0.2 mg/liter, a monochloramine content more than 0.5 mg/liter, or a phosphate-based corrosion suppressor have less bacteria.

Drinking water, Contamination

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Bacterial enrichment at the gas-water interface of a laboratory apparatus

Article Abstract:

The density of bacteria present on the surface of the gas-water interface (GWI) isolated in a glass apparatus decreases with an increase in surfactant level, and increases with an increase in time and bulk bacterial concentration. The bacterial density is affected most by the surfactant concentration. The bacterial surface density is unaffected by pH and ionic strength. This indicates that the adsorption of bacteria to the GWI is significantly affected by hydrophobic interactions.

Research, Analysis, Surface active agents, Adsorption

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Multiregional evaluation of the SimPlate heterotrophic plate count method compared to the standard plate count agar pour plate method in water

Article Abstract:

The SimPlate heterotrophic plate count method produces similar results as the pour plate method. In addition, it does not require culture media, a colony counter, or sterilization and it is easy to count the fluorescent wells.

Methods, Water, Aquatic microbiology, Cultures (Biology)

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