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Juas Water Treatment Works Refurbishment
The refurbishment of Juas Water Treatment Works in the North of the island is now under way as part of a new water treatment strategy, forecast to save £10 million of expenditure over the next 25 years.
The works are being carried out by a team of six Guernsey Water staff - three working full time on site, two of which have qualified through Guernsey Water apprenticeships.
This page will follow the team and their work during the refurbishment process.
Please note, images within the below infographic currently show the works pre-refurbishment.
Juas Water Treatment Works
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This infographic is optimised for use on larger screens but you can still explore the treatment works by tapping on the individual elements in the illustration below. For an optimal experience, we recommend browsing with a larger screen.
Washwater Recovery Tanks
Particles captured in the filter beds will be periodically washed out, this washwater, containing the particles, will then be gravity fed into three of the site's washwater tanks, where the sediment will settle out to form a layer of sludge. The sludge will then be pumped into the sewer network and the remaining water returned to the quarry for future use.
High Lift Pump House
Home to the pumps which will feed treated water into our distribution network. Clean water from the filter beds will flow to the highlift house where it will be treated with ultraviolet light for disinfection and a final dose of chlorine. This ensures wholesome water quality is maintained as it travels through the distribution network to customers' homes. Water samples are taken on a regular basis at this point.
These act as a reserve supply of water within the distribution network to accomodate times of peak water demand.
Random samples are taken from our customers' homes throughout the year to ensure that water quality meets our standards. 1236 individual tests were conducted in 2017
January 2019 - Wash Water tanks in use
The wash water tanks, where water used to clean the filter beds is left to settle, sludge is pumped to the sewer network and water is recycled back into the reservoir
January 2019 - Filter bed during cleaning
A shot of one of the site's filter beds during the cleaning process as part of its testing. Air is forced through the filter medium to agitate the particles and ensure any trapped residue is cleared. The dirty water then flows to the site's wash water tanks
January 2019 - Filter beds in operation for testing
Water entering one of three filter beds from the clarifier tanks, each filter is capable of filtering 50l/sec!
January 2019 - Clarifier tanks
The clarifier tanks full and running as part of the site's testing.
November 2018 - Flow and Turbidity meters in place
Our new flow and turbidity meters have now found themselves at home in our control room
November 2018 - Air blower in place
This unit is the site's air blower, it will be utilised for air scouring of the filter beds.