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Juas Water Treatment Works Refurbishment
The Juas Water Treatment Work's recommissioning project is now complete, with the water treatment works successfully passing its test phase.
This project has been carried out by in-house Guernsey Water Staff, the refurbishment forms part of Guernsey Water's Water Treatment Strategy, revised in 2017 following a comprehensive review of the island's existing and future provisions. The strategy aims to save £10 million of expenditure over 25 years.
You can view the works, the water treatment process, and the refurbishment by using the infographic and refurbishment link below, the site history can be viewed here [3Mb]
Juas Water Treatment Works
Click on the features to learn more!
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 are periodically washed out, this washwater, containing the particles, is then gravity fed into three of the site's washwater tanks, where the sediment settles out to form a layer of sludge. The sludge is then 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 feed treated water into our distribution network. Clean water from the filter beds flows to the high lift house where it is 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 treated water storage tanks provide a simple way to control constant pressures within the distribution network during fluctuating water demands during the day and also provide a short-term supply facility in times of emergency breakdown of pumps or other treatment equipment.
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.