Mosgiel's water treatment
Mosgiel's raw water can be described as clean and pure with a low pH. The only form of treatment used until recently to correct this acidity was caustic soda dosing. This method of treatment was discontinued in 2006 for safety reasons.
Mosgiel water treatment plants
Mosgiel has five treatment plants. They each have capacity to treat the water from the bore supply. They were constructed in 1993 and have over 60 years remaining life. Mosgiel water treatment plants are pH control plants, which generally perform to requirements.
For Mosgiel's water to achieve an 'A' grade, chlorine disinfection needs to become part of the process, but we have no plans to install chlorine disinfection. The target grade for Mosgiel is 'Bb'.
Recent and future improvements
Trialling of enhanced aeration at the Watt Street bore has shown that this is a viable form of treatment to remove carbon dioxide from the water, which makes the water less corrosive.
Work is underway to upgrade Mosgiel's water treatment plants to include a combination of enhanced aeration using vortex accelerators and dosing with soda ash. This will be rolled out at the five treatment plants in 2007 & 2008.
Fluoridated water in Mosgiel
This map shows which parts of Mosgiel receive fluoridated water.
Mosgiel (PDF, 404 kb) (opens in a new window)
Supply, distribution and reticulation
The water is pumped directly from the bores to the reticulation system, controlled by the Quarry Hill reservoir level. The reservoir acts as a 'balancing tank', so any water not used is sent back into storage at the Quarry Hill reservoir. This reduces the amount of water removed from the bores.
Last reviewed: 25 Jul 2008 1:21pm
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