2012/17: Two Wells (South Australia) – Trihalomethanes, Temperature

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Two Wells (South Australia) – Trihalomethanes

Breaches to Australian Drinking Water Guidelines Levels Only

6/02/2012 Two Wells Old Port Wakefield Rd (Public Toilets) Trihalomethanes – Total 264 ug/L

18/02/2014 Two Wells Old Port Wakefield Rd (Public Toilets) Trihalomethanes – Total 287 ug/L

20/03/2014 Two Wells Old Port Wakefield Rd (Public Toilets) Trihalomethanes – Total 271 ug/L

23/12/2015 Two Wells Drew Street Trihalomethanes – Total 252 ug/L

17/3/2016 Two Wells Drew Street Trihalomethanes – Total 278 ug/L

27/10/2016 Two Wells Drew Street Trihalomethanes – Total 259 ug/L

15/2/2017 Two Wells Drew Street Trihalomethanes – Total 278 ug/L

17/3/2017 Two Wells Drew Street Trihalomethanes – Total 256 ug/L

11/4/2017 Two Wells Drew Street Trihalomethanes – Total 255 ug/L

11/5/2017 Two Wells Drew Street Trihalomethanes – Total 258 ug/L

Trihalomethanes Australian Guideline Level 250μg/L (0.25mg/L)

Why and how are THMs formed?
“When chlorine is added to water with organic material, such as algae, river weeds, and decaying leaves, THMs are formed. Residual chlorine molecules react with this harmless organic material to form a group of chlorinated chemical compounds, THMs. They are tasteless and odourless, but harmful and potentially toxic. The quantity of by-products formed is determined by several factors, such as the amount and type of organic material present in water, temperature, pH, chlorine dosage, contact time available for chlorine, and bromide concentration in the water. The organic matter in water mainly consists of a) humic substance, which is the organic portion of soil that remains after prolonged microbial decomposition formed by the decay of leaves, wood, and other vegetable matter; and b) fulvic acid, which is a water soluble substance of low molecular weight that is derived from humus”. Source: http://water.epa.gov/drink/contaminants/in

Two Wells – South Australia – Temperature

November 8 2016: Two Wells (South Australia) Drew St – Temperature 22C

November 17 2016: Two Wells (South Australia) Drew St – Temperature 21C

November 21 2016: Two Wells (South Australia) Drew St – Temperature 22C

December 1 2016: Two Wells (South Australia) Drew St – Temperature 23C

December 8 2016: Two Wells (South Australia) Drew St – Temperature 23C

December 13 2016: Two Wells (South Australia) Drew St – Temperature 22C

December 22 2016: Two Wells (South Australia) Drew St – Temperature 25C

December 30 2016: Two Wells (South Australia) Drew St – Temperature 25C

January 6 2017: Two Wells (South Australia) Drew St – Temperature 28C

January 12 2017: Two Wells (South Australia) Drew St – Temperature 29C

January 19 2017: Two Wells (South Australia) Drew St – Temperature 31C

January 27 2017: Two Wells (South Australia) Drew St – Temperature 28C

February 2 2017: Two Wells (South Australia) Drew St – Temperature 30C

February 9 2017: Two Wells (South Australia) Drew St – Temperature 28C

February 15 2017: Two Wells (South Australia) Drew St – Temperature 27C

February 23 2017: Two Wells (South Australia) Drew St – Temperature 26C

March 2 2017: Two Wells (South Australia) Drew St – Temperature 27C

March 9 2017: Two Wells (South Australia) Drew St – Temperature 28C

March 17 2017: Two Wells (South Australia) Drew St – Temperature 26C

March 23 2017: Two Wells (South Australia) Drew St – Temperature 26C

March 30 2017: Two Wells (South Australia) Drew St – Temperature 25C

April 7 2017: Two Wells (South Australia) Drew St – Temperature 25C

April 11 2017: Two Wells (South Australia) Drew St – Temperature 25C

April 21 2017: Two Wells (South Australia) Drew St – Temperature 22C

GUIDELINE

“No guideline is set due to the impracticality of controlling water temperature.
Drinking water temperatures above 20°C may result in an increase in the number of
complaints.

Temperature is primarily an aesthetic criterion for drinking water. Generally, cool water is more palatable than warm or cold water. In general, consumers will react to a change in water temperature. Complaints are most frequent when the temperature suddenly increases.

The turbidity and colour of filtered water may be indirectly affected by temperature, as low water temperatures tend to decrease the efficiency of water treatment processes by, for instance, affecting floc formation rates and sedimentation efficiency.

Chemical reaction rates increase with temperature, and this can lead to greater corrosion of pipes and fittings in closed systems. Scale formation in hard waters will also be greater at higher temperatures…

Water temperatures in major Australian reticulated supplies range from 10°C to 30°C. In some long, above-ground pipelines, water temperatures up to 45°C may be experienced…

The effectiveness of chlorine as a disinfectant is influenced by the temperature of the water being dosed. Generally higher temperatures result in more effective disinfection at a particular chlorine dose, but this may be counterbalanced by a more rapid loss of chlorine to the atmosphere (AWWA 1990).