THE MITCHELL SYSTEM WATER TREATMENT PROCESS
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11 June 2010 Raw Water is pumped from the Mitchell River at Glenaladale to the Woodglen Water storage basins. The water then flows via gravity into the Woodglen Water Treatment Plant. The water treatment commences using the Dissolved Air Flotation / Flocculation process (DAFF). A coagulant is added to the raw water, which encourages microscopic colour and dirt particles to stick together to form larger visible particles known as ‘floc’. Air injection system – Air bubbles are injected into the water and the ‘floc’ attaches to the bubbles. DAFF flotation chamber – Attached to air bubbles, the ‘floc’ floats to the top of the chamber where it is skimmed off as a sludge. The cleaner water gravitates through a muiti level filter, comprising sand, gravel and anthracite, to ‘polish’ it further. And the sludge? To ensure there is minimal loss of water the sludge is transferred to the washwater system for secondary treatment. The sludge is then spun in the centrifuge to remove any excess water. This excess water is collected and returned to the washwater system where it is able to be reused. The sludge is collected in a skip and is removed from the site, to be beneficially reused on land. The water is transferred to the main supply pipeline and customers via the clearwater tank. Water quality is continuously monitored and controlled via a computer. There is fully automatic operation of all the treatment processes, with an alarm function designed to activate if equipment malfunctions or water quality degrades. Operators can dial in via a computer link, remotely view plant performance and if necessary make adjustments. THE MITCHELL SYSTEM WATER TREATMENT PROCESS The excess water is then returned to the raw water storage via the supernatant tank and pumps where it is stored before it goes through the treatment process again. 1 2 3 4 5 6 8 7 9 10
Transcript of THE MITCHELL SYSTEM WATER TREATMENT PROCESS
11 June 2010
Raw Water is pumped from the Mitchell River at Glenaladale to the Woodglen Water storage basins. The water then flows via gravity into the Woodglen Water Treatment Plant. The water treatment commences using the Dissolved Air Flotation / Flocculation process (DAFF). A coagulant is added to the raw water, which encourages microscopic colour and dirt particles to stick together to form larger visible particles known as ‘floc’.
Air injection system – Air bubbles are injected into the water and the ‘floc’ attaches to the bubbles.
DAFF flotation chamber – Attached to air bubbles, the ‘floc’ floats to the top of the chamber where it is skimmed off as a sludge. The cleaner water gravitates through a muiti level filter, comprising sand, gravel and anthracite, to ‘polish’ it further.
And the sludge? To ensure there is minimal loss of water the sludge is transferred to the washwater system for secondary treatment.
The sludge is then spun in the centrifuge to remove any excess water. This excess water is collected and returned to the washwater system where it is able to be reused. The sludge is collected in a skip and is removed from the site, to be beneficially reused on land.
The water is transferred to the main supply pipeline and customers via the clearwater tank.
Water quality is continuously monitored and controlled via a computer. There is fully automatic operation of all the treatment processes, with an alarm function designed to activate if equipment malfunctions or water quality degrades. Operators can dial in via a computer link, remotely view plant performance and if necessary make adjustments.
THE MITCHELL SYSTEM WATER TREATMENT PROCESS
The excess water is then returned to the raw water storage via the supernatant tank and pumps where it is stored before it goes through the treatment process again.
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