Residual Chlorine Improvement in Woodhill Water Supply Zone

Pollock, Denver (2017) Residual Chlorine Improvement in Woodhill Water Supply Zone. [USQ Project]


The need for this study was identified when commissioning a new chlorine dosing unit at the Woodhill reservoir. It was assumed at the time that the new chlorine dosing facility would improve the availability of residual chlorine throughout the network.

After commissioning it was identified that the available residual chlorine level did not extend as far into the network as previously estimated. This study investigates the reasons behind the lack of available residual chlorine and the methods used to improve the chlorine residual.

In January 2015 and January 2017, a positive result for Escherichia coli (E. coli) was found in the Mundoolun reservoir. To deactivate and prevent the growth of harmful bacteria in drinking water, chlorine is commonly used. Higher residual chlorine levels ensure disinfection yet have undesirable taste and odour issues. In addition, higher residual chlorine levels can produce disinfection by-products which may negatively impact public health.

To determine the extent of the chlorine residual, a model was developed and calibrated with data from the field. This model was then used to trial different techniques to reduce chlorine decay and extend the availability of residual chlorine throughout the network.

Testing the different techniques using the model gave interesting results. Much of the chlorine residual in the network could be improved by changing the operational philosophy of the network. However, additional chlorine dosing units were required to ensure the entire network met the Australian Drinking Water Guidelines (ADWG).

After operational changes are made, the residual chlorine levels in the network are to be monitored. The model is to be recalibrated and the need for additional chlorine dosing units is to be reassessed.

Therefore, to ensure the entire network meets ADWG guidelines for chlorine residuals, a combination of operational changes and capital works is required.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) (Civil)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Aravinthan, Vasanthadevi
Date Deposited: 06 Sep 2022 01:49
Last Modified: 06 Sep 2022 01:49
Uncontrolled Keywords: water supply; chlorine; Woodhill reservoir

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