Ultrapure Water Solutions
RWL Water designs, manufactures, delivers, and operates advanced ultrapure water solutions that use membrane and electrodeionization technologies.
A reverse osmosis (RO) system produces 13 m3/h permeate flow of soft water for a cooling tower, and an ultrapure water (UPW) system produces 16 m3/h permeate flow of deionized (DI) water for gas turbines and boilers.
RWL Water provides tailor-made ultrapure water systems using industry-proven membrane-based technologies, including ultrafiltration (UF), reverse osmosis (RO), gas transfer membrane (GTM) degasification, and continuous electrodeionization (CEDI). These solutions, which meet stringent industry site-specific quality targets, are compact, reliable, and provide a continuous supply of high-quality water with a resistivity of up to 16 Mohm/cm, that is, < 0.1 µS/cm.
Each system is custom-designed, based on a range of factors including the specific characteristics of the available feed water, redundancy, and the quality requirements for the desired final product water. Our system can be designed to produce ultrapure water for a range of applications including food, pharmaceutical or microelectronics production, and boiler makeup water for power plants.
Using RO and CEDI technology for demineralized water polishing provides customers with operational benefits over traditional solutions that use ion exchange resins. A water treatment process using these technologies eliminates the use of expensive regeneration chemicals, is environmentally friendly, and is the safest process available in the industry.
Small footprint, ease and safety of operation, constant and consistent permeate quality, and no need for regeneration chemicals are among the reasons this all-membrane combination of technologies has revolutionized the UPW market.
Industrial Uses for Ultrapure Water
A wide variety of industries use electrodeionization, from semiconductor and chemical manufacturing, to combined-cycled power generation. It is also a successful solution for industries that rely on steam generation.
A typical RWL Water containerized ultrapure water system uses several technologies, including:
- Pretreatment, which may be some sort of filtration (media filtration, activated carbon filtration, UF, or cartridge filtration), depending on feed-water source or chemical pretreatment
- Double-pass reverse osmosis, a step in which most of the dissolved solids in the water are removed and a permeate is produced
- GTM degasification for removal of dissolved CO2 and other gases that contribute to water conductivity
- Continuous Electrodeionization (CEDI), which is used to bring demineralized water to the required quality.
Systems can be designed to fit inside marine containers or can be skid-mounted.
In addition to offering makeup water UPW systems to power plants and industrial clients, RWL Water also offers condensate polishing plants (CPP) based on state-of-the-art mixed-bed ion exchange resins. Makeup water is the water that is constantly fed into the otherwise closed circuit water and steam cycle of a power plant.
Ultrapure Water Case Study: Demineralized Water for Israeli Utility
When the Israel Electric Company (IEC) decided to convert some of its inland open cycle gas turbines to combined cycle power generation, it needed a high-quality source of demineralized water as to use as makeup water for the heat recovery steam generator (HRSG) and for injection for NOx emission reduction. A HRSG is a boiler that generates steam by transferring the energy (heat) in gas turbines to the water cycle.
RWL Water was chosen to design and supply a containerized solution to meet specific ultrapure water-quality needs. The primary parameter was to provide water with a 10 Mohm/cm resistivity. At each power plant, a full duty-standby UPW system was installed with a capacity of 20 m3/h each.
Each of these systems consists of several technologies in a series of steps:
- First, a media filtration unit removes residual turbidity and suspended solids present in the raw water. This step also includes treatments such as alum dosing and prechlorination.
- Then, activated carbon filtration is used to remove organic material and residual chlorine. The chemical pretreatment step includes pH adjustment and antiscalant dosing.
- Water then passes through a 5-micron cartridge filter.
- Next, water is passed twice through reverse-osmosis membranes before passing through gas-transfer membranes that remove CO2 from the RO permeate.
- Finally, the water is polished to <10 Mohm/cm by CEDI systems.
Each ultrapure water-treatment system was built using two 40-foot-long High Cube cargo containers. The first houses media prefiltration, activated carbon, chemical pretreatment, and the 5-micron cartridge units. The second contains a skid-mounted, double-pass RO unit, gas-transfer membranes, and a skid-mounted electrodeionization unit. It also houses the system’s electrical and control panels and HMI computer station. This compact design allows the system to be easily installed and maintained by the utility.
Between 2006 and 2010, RWL Water supplied IEC with 17 containerized units, all installed in power plants throughout Israel.
Decades of Ultrapure Water Expertise
All RWL Water ultrapure water technologies are engineered to match your unique water treatment challenges. Our equipment is ruggedly built, specifically designed to provide users with extended, trouble-free operation.
Our experts can assist you in the proper sizing, layout, and operation of your ultrapure water system. From design to financing, whether it is a turnkey water demineralization system or an advanced water electrodeionization facility, RWL Water is committed to excellence and high-quality service to ensure client satisfaction.
Please contact us with any questions about our ultrapure water solutions, or to request a quote.