Due to an increasing population and historical issues with the existing bore water supply, Dowdens Pumping & Water Treatment was engaged to design, construct and commission a new fully automated Water Treatment Plant including a 2ML Treated Water Storage Tank for the Nebo Township by Isaac Regional Council.
The Nebo Water Supply Upgrade was driven by the objectives of improving the water supply quality and overall water security of Nebo. The Project addresses historical issues with the bore water supply for the Nebo township. A summary of the critical issues and risks identified by Isaac Regional Council include:
Dowdens were successful in the tendering process due to:
The new plant increases the Towns water treatment capacity from 400kL/day to 2ML/day with a peak output of 90kL/Hr (26L/s). A superior level of water treatment is achieved using filtration, softening and Chlorine / UV disinfection processes.
The Nebo Water Treatment Plant consists of raw water tanks (2 of ), glass media filters (6 of ), ion exchange vessels (3 of ), a 10kL brine tank (1 of ), ultraviolet disinfection units (2 of ),
chemical dosing systems (NaOH and chlorine gas) and associated tanks, pumps and water quality monitoring instrumentation.
Raw water is produced by the existing borefield, made of 6 separate bores, and transferred to the site via an isolated borefield network. The raw water is then stored on-site in the raw
water tanks, which act as a buffer (1 – 2 hours) for the main water treatment plant process, the Filter Feed System, which consists of the glass media filters, the ion exchange vessels and the ultraviolet disinfection units.
The raw water is pumped to the glass media filters to reduce the turbidity of the raw water by removing most of the suspended particles that are greater than 1 micron. The GMF filtrate is then partially softened, by utilising a modulating control valve installed in the IX by-pass, to a target treated total hardness level.
If required, prior to the ultraviolet sterilisation units, the IX filtrate can be dosed with diluted sodium hydroxide to increase the final treated water pH prior to storage in the 2 ML treated water tank.
The IX filtrate, now partially softened (and potentially pH corrected), is disinfected via a large low-pressure UV unit that monitors the instantaneous UVI and modulates the duty units
output based on the known flow to ensure the minimal level of disinfection is achieved.
The now sterilised water produced by the main water treatment process is disinfected with super-chlorinated water produced by a proportionally controlled chlorine gas dosing system. This is the final process step before the treated water enters the 2 ML treated water tank.
The water stored in the 2 ML treated water tank is constantly recirculated with the residual free chlorine levels monitored and automatically topped up as required.
The new WTP is completely automated and user-adjustable via the CITECT SCADA Computer System. Operators receive alarms remotely and can log into the plant and take control without the need to set foot on site. If operators need to attend the site they can open/close the main access gate through an application on their phone via the 3G Enabled Security System. The system logs the date/time of entry and the operator who was present.
Dowdens coordinated the design, build and commissioning of the WTP from project inception through to final handover. This included, but was not limited to:
Dowdens Pumping and Water Treatment offers a wide range of high-quality products from globally recognised brands, ensuring customers access reliable and efficient solutions. We are also authorised service agents for all the brands we supply.
Dowdenp provides comprehensive brochures in our Document Library, showcasing our extensive range of products and solutions for pumping and water treatment. These brochures showcase our capability to create custom solutions for any application and highlight our team of industry-trained professionals who can adapt to meet your specific needs.
The Dowdens Video Library features real-world examples of installations, showcasing our practical experience and problem-solving skills. Also included is a comprehensive range of brand videos showcasing various product uses and capabilities.
Dowdens Case Studies highlight our extensive expertise in providing innovative and practical solutions across various industries, including agriculture, mining, construction, and municipal services. These detailed insights demonstrate our ability to manage projects from initial planning and design through to final commissioning.
The Dowdens Team are ready to help. Contact us today for more information and to start the conversation.
Dowdens has four convenient locations throughout Queensland. We have branches in Mackay and Proserpine in the north, servicing the Sugar and Coal industries, a centrally located branch in Rockhampton, specialising in the Agricultural and Coal industries, and a branch in Brisbane, servicing multiple industries in the southeast of Queensland.
"*" indicates required fields
