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Water and Wastewater Plant Directory
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Tuakau, Waikato, New Zealand
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Waikato Water Treatment Plant
Haywards road
Tuakau, Waikato, 1703
New Zealand
Contact Information:
Contact: Andy Williams
Email:
adwilliams@water.co.nz
Telephone:
Fax:
Plant Operation: Municipal
Processing: Water
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Web site:
http://
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Plant/Process Description:
The four-stage, ultra-filtration treatment
process
1. Coagulation and clarification - Here
coagulant (aluminium sulphate), lime and carbon
dioxide (to adjust the pH) are added to the raw
water. The coagulant causes particles in the
water to clump together into larger particles
called floc which are easier to remove during
clarification. The coagulated water is then
passed through clarifiers. The coagulated solids
settle at the bottom of the clarifiers while the
clarified water is decanted from the top. The
coagulated water is then fed through settling
plates and a blanket of sludge solids. The floc
clings to the sludge which is then removed.
2. Membrane filtration - The water is then
treated by advanced, ultra-filtration membrane
technology which is considered by international
experts to be a fully effective barrier to
pathogenic organisms in water and guarantees
against contamination from parasites such as
giardia, cryptosporidium and most viruses.
3. Granular activated carbon filtration - Here
any organic compounds are then absorbed into the
carbon particles where they remain or may be
broken down by the action of harmless bacteria.
The carbon also removes any unpleasant tastes or
odours from the water.
4. Chlorine treatment - The water is finally
treated in a chlorine tank to kill any remaining
viruses and prevent bacteria growth during the
water's storage and transportation. About 30-40
percent less chlorine will be needed than at
Watercare's other treatment plants because the
water will be of a much higher standard.
Membrane filtration technology is used
successfully in other developed countries
including France, America, Canada and Great
Britain. In most cases, the raw water being
treated in those overseas plants contains far
more pollutants, bacteria and viruses than the
Waikato River.
Ontario, Canada, has used the technology for the
past three years. The Ontario Public Utilities
Commission says the membrane technology has
proved an "absolute barrier" to harmful
contaminants, and that due to the success of its
operation, 12 similar plants have been
constructed around Canada.
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Owner:
Watercare Services Ltd
Web site:
http://www.watercare.co.nz
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Operating Company:
Watercare Services Ltd
Web site:
http://www.watercare.co.nz
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Directions:
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Disclaimer:
Water and Wastewater.com provides the information on
this page for reference purposes only. We do not certify
the accuracy of the information provided by third-party
individuals for this listing.
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