Conference Papers | 2008 Conference Papers

GUARANTEED DISINFECTION RESIDUALS AT NETWORK EXTREMITIES BY SECONDARY CHLORINATION

David Ronald, Business Development Manager, Environmental & Process Technologies (a division of Biolab (Aust) Pty Ltd)

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ABSTRACT

To reflect the fact that water flows from the Rosewood Reservoir Pumping Station in Orange NSW are highly variable,
a new hypochlorite dosing system was installed.

Previously, a “fixed rate” injection of hypochlorite into the outlet of the 20 ML Reservoir, meant that residuals at
the reticulation extents were also variable. The Orange City Council operating staff know the usual flow patterns,
so this “fixed rate” can be altered for week days, holidays, weekends etc.

Orange City Council were also very aware of the need to protect their staff against accidental exposure to
hypochlorite, therefore any new system must be designed with clear OH&S advantages.