Veolia Water Technologies UK (VWT UK) has designed and supplied two water treatment technology solutions for a major industrial customer in north-west England. The client required both demineralisation and deoxygenation systems to provide high-quality process water for its manufacturing facilities.
For its demineralised water system, the client wanted to replace its current installation with a more compact solution. In addition, they wanted to remove the need to use chemicals in the process, whilst maintaining the same consistent and reliable water specification. There was also a need to have a containerised solution that could be moved from site to site.
The existing demineralisation plant used ion-exchange and as such required frequent regeneration of the potentially hazardous chemicals. Due to the age of the system it had become unreliable, causing issues for the operation of the facility, delaying schedules and increasing costs.
In close cooperation with the client’s technical team, the VWT UK project team developed a system that met the project’s specific needs. The IonPROTM MK II LX ‘Multi-Technology’ system provided the solution. The IonPROTM MK II LX, with the smallest footprint in its class, contains a fully integrated water treatment train consisting of: duplex softeners, a granular carbon cartridge pre filter, a tank and pump, low pressure reverse osmosis (RO) modules and continuous electrodeionisation (CEDI) module. Contained within a single stainless steel frame with protective covers, the compact design enables short lead times and quick start-up times, maximising efficiency and reducing costs.
The client had further specific requirements that had to be met, such as the ability to ensure consistent operation at lower feed water temperatures. With the combined technology of reverse osmosis and continuous electrodeionisation, VWT UK was able to fulfil the key requirement of removing the use of chemicals from the process, yet consistently and reliably achieving the required water quality and flow rate.
To assist the client, the IonPROTM MK II LX system has a fully automatic sanitisation sequence and cleaning in place procedure. These procedures are easily carried out by following the prompts displayed on the touch panel display. The procedures utilise the integral tank for chemical mixing and recirculation. The IonPROTM MK II’s microprocessor controller with its intuitive Human Machine Interface (HMI) and system set points are easily configured and protected by I-button security. The complete system was designed and installed and can be operated within the smaller container.
The client also required a replacement for its water deoxygenation plant with the aim of improving performance, increasing capacity and achieving an enhanced redundancy.
The deoxygenation system is used to treat the demineralised feed water at a flow rate of up to three cubic meters per hour and achieve a dissolved oxygen level of less than ten parts per billion (ppb). The new solution had to be extremely robust in terms of its engineering and fabrication because of the location of the system. Designed and built to withstand a harsh environment, the system utilises stainless steel 316L build material and reduces as well as eliminates substances that are hazardous to the client’s processes.
The existing chemical and resin based system used chemical dosing, carbon filtration and ion exchange polishing to achieve the required levels of treatment. VWT UK designed and supplied a state-of-the-art deoxygenation solution based on membrane technology that met and exceeded the stringent, less than 10 ppb O2, requirement. The system uses a series of hollow fibre membranes and a bespoke control system that pulls a vacuum through the membrane, eliminating any O2 ingress. The water is passed through the membrane with a counter flow of nitrogen, used as a strip gas, to deoxygenate the water.
The VWT UK solution was designed to reduce corrosion in the client’s system, which prevents leaks, provides better security and lowers maintenance costs. In addition, this system has a number of benefits over other approaches including improved safety by removing the need to store, handle and dose the system with chemicals.
The new plant includes process units to pre-treat and deoxygenate the water together with monitoring equipment and a control panel providing all control and interlock functions. It is fully enclosed in a weatherproof package and skid mounted on a liftable frame, allowing it to be moved using a forklift or crane for greater mobility.
VWT UK has extensive experience of this type of installation and had used similar deoxygenation technology at Wylfa power station. Veolia Water Technologies was able to offer security as a long established solutions provider of water treatment solutions. In addition, the products have been designed to last longer and VWT UK provides a comprehensive range of services to help maintain the systems.
A client representative commented: “The demineralisation and deoxygenation systems designed and built by Veolia Water Technologies UK meet our highest specifications. The solutions provide us with consistent high-quality water whilst helping to eliminate the use of hazardous chemicals and the associated health and safety issues.
“Veolia Water Technologies UK provided a quality service from start to finish. The project ran smoothly with the result that the work was completed on schedule, within budget and with no interruptions to the normal operations at our facilities.”