Drought Response Desalination

Temp DeSal Wave 750x750

We are seeking planning approval for the possible construction of a drought response desalination plant at Belmont.

This drought response is our insurance policy in a worst case scenario if the Hunter reached critical water storage levels in unprecedented drought conditions. The plant would only be built after a suite of water saving, drought response measures were introduced across the Hunter.

While the likelihood of having to construct the plant is low, we need to get planning approval now so our community does not face severe water shortages if the worst case scenario eventuates.

What's involved in the planning?

Drought

We are seeking planning approval for the possible construction of a drought response desalination plant at Belmont.

This drought response is our insurance policy in a worst case scenario if the Hunter reached critical water storage levels in unprecedented drought conditions. The plant would only be built after a suite of water saving, drought response measures were introduced across the Hunter.

While the likelihood of having to construct the plant is low, we need to get planning approval now so our community does not face severe water shortages if the worst case scenario eventuates.

What's involved in the planning?

Drought response desalination was part of the NSW Government’s 2014 Lower Hunter Water Plan as a last resort for drought security.

We have started the planning approval process by engaging with our community and working on an Environmental Impact Statement to support our development application to the NSW Department of Planning.

Where will it be located?

Hunter Water land, adjacent to the Belmont Wastewater Treatment Works, was selected for the temporary plant after a multi-site analysis looked at factors such as costs, power supply, environmental and community impacts. Ongoing environmental assessments will look closely at each of these factors as we move through the planning process.

We want to hear your views as we go through the planning stages. For more information, refer to the Frequently Asked Questions, join the Discussion Board or contact us.


Please ask a question about this project, we will be pleased to assist you.

Q&A

  • How will the salt generated by the process be disposed of; will it be dumped in the lake, in the sea or sold?

    Chris Craig asked 9 months ago

    Thanks for your question.

    Salt is removed from seawater during the desalination process as a concentrated seawater solution called brine. The current proposal is to pump brine from the temporary desalination plant to the existing Belmont Wastewater Treatment Works ocean outfall, where it would be returned to the sea, along with wastewater effluent, through a large pipe that already lies on the seabed. The effluent and brine would be dispersed using specially designed diffusers. This process would quickly return the brine and effluent to normal ocean salinity and temperature.

  • 1. If the desal plant is commissioned and construction completed, how long would it take for the plant to become fully operational supplying 15 ML/day once it is "switched on"? 2. What would the average cost per household be when: a) the desal plant is operational (up until the target minimum storage is reached and then "switched off") b) the constructed desal plant is in "standby mode" (switched off) but ready to go for the next time storage drops to 35%, or whatever minimum level is set to trigger switching back on

    mike asked 11 months ago

    Thank you for your questions.

    In response to your first question; in the event that water storage levels drop below 35%, construction would commence on the temporary desalination plant so that it can be commissioned and operated as soon as possible if storage levels continue to fall. However the plant would only commence operation if water storage levels were less than 30% when construction and commissioning is completed. 

    The length of time between completion of construction and the start of operation would depend on construction timing and the rate of storage depletion. The current design work will help to clarify this timing and risks for delivery.

    In response to your second question; once the design phase has been completed, we will have further detail on the cost of construction and operation. Part of this planning process is for Hunter Water to look at all possible options including how the plant will be funded. However, our research shows it will be at considerably less cost than other permanent desalination plants. A temporary plant presents as the most viable emergency water source option to help prolong supplies during a severe drought.

  • Is it true that the Desalination plant operating at Newstan Colliery to dewater the mine is pumping 10megalitres a day of clean water into a creek as Hunter Water refuses to take it for free? If so, why are we funding a new Desalination plant at Belmont!!

    Rod asked 10 months ago

    Thank you for your question. The temporary desalination plant at Belmont would only be built in the event of a severe drought, when our water storage levels fall to an unprecedented 35%. This is to ensure funds are not expended on building the plant unless it is required. The purpose of the proposed temporary desalination plant is to supplement our existing water supply during such drought conditions, providing up to 15 megalitres per day of potable water (drinking water) for the duration of the drought.

    Prior to determining that Belmont was the best location for a temporary desalination plant, Hunter Water considered a range of other options including desalination of water sources other than seawater. Newstan Colliery (owned by Centennial Coal) was included in this process, where the potential for water to be extracted from the mine void at Newstan Colliery and treated for potable use was assessed. This assessment found that during drought conditions, the Newstan Colliery would only be capable of providing around 10 megalitres per day for a maximum period of around three months. This is an inadequate timeframe for supply of drinking water during drought conditions, which would likely extend for a much longer time period. Water from the Newstan Mine is not currently desalinated and additional treatment processes would also be required to meet recycled water quality standards.

    Hunter Water is working closely with the NSW Department of Industry and other stakeholders to undertake a major review of the Lower Hunter Water Plan (LHWP). The LHWP is a whole of government approach to ensure the Lower Hunter has sufficient water supplies to enable a sustainable future for our region. A range of supply and demand side options are being investigated through the LHWP, including using alternative water sources for non-potable use such as mine water, stormwater and recycled wastewater. The community will be engaged throughout this process to ensure our long term water planning reflects the values of our community.

  • When can we expect for the final report to be submitted to the Department for Planning?

    Wave415 asked about 1 year ago

    Hunter Water has started the planning approval process with community engagement and working on an Environmental Impact Statement. This will support the development application to the NSW Department of Planning. It is proposed that a final report will submitted to the Department of Planning by June 2019. The report will also be put on public exhibition for comment from the community, stakeholders and interested persons.

    Subscribe to our Your Voice page to receive project updates and alerts as we progress through the project. 

  • The following comment was submitted by a community member: "One way to reduce water usage would be to charge more for the use of water and less for the supply charge. The current system of high supply charges coupled with lower fees for the use of water does not encourage customers to use less water."

    TempDesalAdmin asked about 1 year ago

    Setting the right level of fixed and variable water charges is challenging. Currently, the typical household annual water and sewer bill is made up of a variable component of 37 per cent. However, variable charges can make up 89 per cent of the 2017-18 typical household annual water-only bill.

    Hunter Water’s prices are periodically reviewed and determined by the Independent Pricing and Regulatory Tribunal (IPART). IPART’s current price determination applies until 30 June 2020 and we will be making a submission to IPART by 30 June 2019 that will help to set prices from 1 July 2020.

    We encourage community members to get involved in the discussion around water pricing by visiting the Your Voice page for our 2019 Price Review at https://yourvoice.hunterwater.com.au/Price-Review-2019

  • The following question was submitted by a community member: "The desal plant is a great idea but what about the on-going costs involved in on-going maintenance & upkeep - the Sydney desal plant struck trouble this year when maintenance hadn't been kept up & the plant was unable to start producing water. Has this issue been addressed?"

    TempDesalAdmin asked about 1 year ago

    The Belmont desalination plant is designed to be temporary in nature, constructed only in a severe drought once a suite of water saving measures have been implemented across the Hunter. 

    Once water storage levels return to an acceptable level the plant would be decommissioned negating the need for on-going maintenance. Some infrastructure could remain on site but the desalination components could be sold off. The timeframe for decommission would depend on water storage modelling at the time.

  • The following questions were submitted by a community member: "I am pleased that Hunter Water is investigating a proposed temporary desalination plant site at Belmont as part of a smart water management plan and I look forward to an update on progress. I wonder what other measures are being planned / implemented for the long term? It is a fact that trees attract rainfall and no one can fail to note that the worst drought affected areas in the Hunter are those that have been denuded of trees. Are there any tree planting projects in existence? Could there be co-operative ventures with local councils?"

    TempDesalAdmin asked about 1 year ago

    One of Hunter Water’s goals is to lead the development of a sustainable and resilient water and wastewater future for the Lower Hunter. A temporary desalination plant at Belmont would only be constructed after a suite of water saving measures are implemented across the Hunter.

    Water conservation projects, including water efficiency, leakage management and recycling projects, are being developed. A Sustainable Wastewater strategy will help define our long-term approach for wastewater system performance, recycled water management and biosolids management.

    Hunter Water is also determining our Economic Level of Water Conservation (ELWC). The ELWC Methodology discussion paper has been released and is available for review and comment.

  • The following suggestion was provided by a community member: "A digital water metre for your shower, so that way it will cut off your water if you are using too much will help it".

    TempDesalAdmin asked about 1 year ago

    Community support is important to Hunter Water. You can join the #LoveWater conversation and share your water saving ideas on the discussion forum.

  • Why are we going to spend money on something that uses power and creates waste, when we should be encouraging reduced use instead - so much water is just wasted

    Lizzie asked about 1 year ago

    A temporary desalination plant in Belmont is a last resort measure during a severe drought. It would only be constructed after a suite of water saving measures were implemented across the Hunter including water restrictions. Any water restrictions that are put in place are specifically intended to reduce water consumption and therefore delay the need to construct the desalination plant.

    Hunter Water aims to continually advise the community about how to save water, particularly through our current ‘Love Water’ campaign. More information can be found at on our Love Water and Save Water Your Voice pages.

  • Are you able to provide example(s) of temporary desalination plants, similar in design to that which is planned for Belmont, that have been successfully commissioned in other parts of Australia/world?

    neo23 asked about 1 year ago

    The design of the Belmont temporary desalination plant has not yet been finalised as we are still in the investigation phase. Initial investigations for the Lower Hunter Water Plan identified that small, land-based, temporary units could provide a flexible supply in a severe drought.

    During the 2006 drought, the Central Coast obtained planning approval to install several temporary desalination units. However the drought eased so they did not need to proceed with purchasing and installing the units. This means there is recent local experience to draw on in designing and procuring temporary desalination units.

    Portable desalination units are used for drinking water supplies for naval and cruise ships, desalinating mine water, as well as providing emergency drinking water supplies after natural disasters such as Hurricane Katrina.

    The proposed desalination process, reverse osmosis, is in use in desalination plants around the world including many cities in Australia such as the Perth Seawater Desalination Plant which has won numerous national and international awards.


  • Why is it being built at Belmont? If it was built at say Raymond Terrace surely the water would require a lower level of treatment because the water is less saline and the operating costs would be lower.

    Rick asked about 1 year ago

    Hunter Water performed a multi-site analysis to determine the best place to build a temporary desalination plant. The analysis included Hunter Water land at Belmont Wastewater Treatment Works, the former Stockton Wastewater Treatment Works, Eraring Power Station, and Newstan Colliery. The analysis looked at costs, power supply, and environmental and community impacts.

    The Belmont site was selected as the best option, given existing ownership of the land, construction costs, and lower community disruption and impacts. The brine (remaining salt water from the desalination process) could also be returned via the existing outfall at the Wastewater Treatment Works.

  • Why do Hunter Water propose to use the osmosis process rather than flash evaporators?

    Rick asked about 1 year ago

    In planning for the temporary plant, Hunter Water investigated all available options for desalination. The improvements in technology, and process, showed reverse osmosis as the preferred method when considering investment and maintenance costs, the required purity of the desalinated water and energy usage.

  • Why would we not use recycled water just like many other cities?

    Rick asked about 1 year ago

    Hunter Water will soon begin supplying recycled water to 355 homes in Chisholm and 772 homes in Gillieston Heights from the Morpeth and Farley Treatment Plants. The Kooragang Recycled Water Scheme has been in operation since 2014, providing high quality recycled water to industry on Kooragang Island.

    Hunter Water is working to identify water savings, implement recycled water schemes and better use storm water to reduce the demand on our drinking water supplies. A temporary desalination plant would only be built after a suite of water saving, drought response measures were introduced across the Hunter.

    We are committed to finding ways of saving water so that we all use this precious resource wisely, and keep our options open in future source planning.