Plant operators face a number of challenges for the provision of treated water from production and operations to the provision and commissioning of new schemes. These challenges include maintaining and refurbishing plants in a timely manner and preventing downtime. At all times, these needs must be met in a safe and economic way to reliably address all production demands.
Mobile water services - applications
Occasionally companies will have an unexpected need for replacement treated water solutions. In these situations, emergency temporary solutions can prevent downtime due to an unforeseen requirement. This could be the requirement to make up for plant failure.
In another situation a site may need to carry out routine planned maintenance on their water treatment plant and in this case they need a temporary solution for weeks or months whilst work is carried out to avoid disruption to services.
Another potential need may be during the construction phase of a new network or extension of an existing one. When equipment needs to be commissioned, engineering companies can benefit from the rental of mobile assets to permit the rapid filling and flushing of tanks and pipework to ensure contract deadlines are achieved without delay.
An evolving technology
A lot has changed since mobile water services were first introduced into the market. Originally, they were simply ion exchange resins mounted inside trailers, which could be transported to a site to provide a temporary supply of high purity water. However, needs have diversified, generating demand for a broader range of physical and chemical technologies including degasification, pretreatment by clarification and filtration as well as reverse osmosis, absorption, ultrafiltration and ancillary equipment.
The modular design allows a variety of process configurations to be combined, making it possible to treat a town’s mains, borehole, river and reservoir water, and even wastewater resources.
Chemical Free Degassing
A key technology is our REMOX units. These are membrane degassers which can achieve reductions in oxygen saturation levels in feed water to levels as low as 20 parts per billion (ppb) without the use of chemicals. The system is housed in a container and can be used to remove the oxygen and carbon dioxide content from process water in a flexible, fast and efficient way. Such treatment is necessary to avoid corrosion in the pipes.
The units’ portability enables them to be positioned to make the best use of the available space, eliminating or reducing the need to build infrastructure to house the equipment. Any number of assets can be operated in parallel or in series to provide the required flow rate. In addition, these modular units can be easily exchanged over time for the latest, updated technology, ensuring that a company’s water treatment systems remain at the cutting edge and benefit from the most cost effective, available solution from its mobile water services supplier.
Chemical free water degasification for District Heating Network, The Netherlands
One Power, based in the Netherlands, supplies water to three district heating networks. The operating site needed to carry out long term maintenance on their water treatment plant and went to Veolia Mobile Water Services to provide the temporary water treatment service required.
Veolia provided its REMOX technology for this project. REMOX are membrane degassing units (MDU). They provide a compact, efficient and maintenance free technology to remove oxygen and carbon dioxide (oxygen <10 ppb carbon dioxide <0.3 ppm) from water in a flexible, fast and efficient way, without the use of chemicals. This treatment is necessary to avoid corrosion in the pipes, especially in closed water systems. Such an approach is essential for district heating systems.
The REMOX 50C is used to fill the heat buffers. The system treats 50 m³ of water per hour. There are also versions with a double capacity available, which are especially applicable for filling 'heat buffers' and pipe systems for district heating. With such projects, it can be a challenge to ensure that extra oxygen does not get into the water again after the treatment. That is why special pumps and fixed piping instead of hoses are used.
Mobile Water Services used for the expansion of a utility provider in Germany
A major German municipal energy and water utility company has been adapting to the changing power market. With coal fired power stations closing, the focus is on future-proofing and expanding gas and steam turbine power plants. At one site, a new heating storage reservoir was being built. Veolia worked to support the EPC responsible for this project. The engineering company were building the new circa 40,000m3 heat buffer tank, which is operated with >100°C water and needed to be filled with deoxygenated water.
This reservoir allows a more flexible and economical use of the power plant. At certain times the power plant can run at lower capacity or even be turned off while the heat storage is able to maintain the district heating supply for the city for up to 70 hours.
For this construction project Veolia Mobile Water Services provided a reverse osmosis MORO - 4 x 25T running in double pass configuration feeding a REMOX - 100C to produce 45m3/h, 24/7 deoxygenated and demineralised water. The conductivity required was <40 µS/cm and O2 <50 ppb. Additional supply of a feed water buffer and two MOPS-170i pump skids assured a constant filling of the heat buffer. An important benefit here was the deoxygenated water was achieved without the use of chemicals.
Reliability and security in supply of treated water are key
Water treatment asset rental offers an attractive solution to support and complement existing assets ensuring the provision of treated water at all times including emergency events and planned interruption for maintenance or refurbishment. This service provides a unique contingency plan so that you can have peace of mind in the event of an unforeseen or planned requirement and rely on being fully operational with the desired level of security and protection at all times.
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About the Author
Dominique has worked with industrial customers for over 20 years, joining Veolia Mobile Water Services almost 3 years ago. He has held several senior management roles including Services Director and Commercial Director in the Benelux for water treatment providers. Within Veolia as Commercial Director Europe for the Mobile Water Services he extended his geographical footprint with the objective to meet and exceed customer needs and ensure service excellence. He leads the sales development and growth of the MWS business across Europe.