What is ultrapure water and high purity water

Ultrapure water (UPW) or high purity water (HPW) are terms describing water that has been purified at very strict specifications as close as possible to pure H₂O by combining water purification component technologies.

Also, the ultrapure water has removed all the conductive components such as solid substances, salts, organic particles, and dissolved gases. That is why the high-purity water has very low conductivity which means it is high in resistivity.

Ultrapure water conductivity

Ultrapure water conductivity can be up to 0,055 µS/cm at 25℃, also expressed as the resistivity of 18,2 MΩ∙cm.

Ultrapure water pH

At a resistivity of 18,2 MΩ∙cm, the water has a pH of 7,0. At resistivity of 5 MΩ∙cm, the pH is in the range of 6,3 – 7,8.

UPW production by MPure™ units

MEGA provides continuous electrodeionization solutions for ultrapure water production. The advanced MPure™ line of modules developed by MEGA, the experts in electroseparation, can be interconnected to provide high flow blocks. Modules have a robust aluminium enclosure. MPure™ modules produce high resistivity water with low silica levels consistently.

What is electrodeionization

Electrodeionization (EDI) is a deionization technology to produce high purity water. It typically operates after the pretreatment and the reverse osmosis process.

Main benefits of MEGA ultrapure water (UPW) system

• Industrial application modules capable of reaching 18,2 MΩ∙cm product water resistivity.
• MPure™ line of modules covers flow rates from 0,8 m³/h to 15 m³/h within one installed module.
• Cost reduction by integrating modules into ultrapure water systems – RALEX® HPWU.
• Suitable for high flow rate systems.
• Small footprint – suitable for operation inside containers.
• Easy maintenance.
• Modularity and redundancy – cube-shaped modules offer different options of interconnection.
• Option for direct discharge of electrode stream.

Industrial applications of MEGA Ultrapure Water System

Electrodeionization technology by MEGA helps many companies in various industries to reach ultrapure water with fewer costs and more benefits to the environment, for example:

• power industry - boiler feed water,
• rinse water for electronics and semiconductor industry,
• industrial process water,
• food and beverage industry,
• pharmaceutical industry.

Advantages of electrodeionization (EDI) over conventional Mixed Bed technology

The capacity of the standard ion-exchange columns (cation, anion, mixed bed) is limited and IEX column requires frequent regeneration by acid and caustic. Electrodeionization operates without regeneration chemicals. The elimination of bulk chemical storage and neutralization systems reduces the footprint of the water treatment system. High purity water is produced continuously at competitive costs. The main benefits of EDI are:

• elimination of regeneration chemicals,
• continuous operation = stable product water quality,
• small footprint,
• low capital and operating costs,
• effective redundancy,
• environment-friendly technology.

MEGA UPW modules MPure™36, MPure™12, MPure™6

MEGA provides separate EDI modules which vary from different amount of number of cell pairs. The MPure™ module produces 16 to 18 MΩ·cm product water quality at very high recovery. These modules are designed to replace mixed bed ion exchange at flow rates from 0,8 to 135 m³/h (3,7 to 2000 gpm) and beyond.

The advanced MPur™ stacks continuously produce high-resistivity water with low silica levels. Stacks can be interconnected to provide high-flow blocks. The robust design prevents both internal and external leaks. Exhaustive factory testing of each stack guarantees you will receive the stack in optimal condition, ready to plug-in.

MEGA UPW modules specifications

MEGA Ultrapure Water system – RALEX® HPWU

MEGA continuous electrodeionization system HPWU is a simple and cost-effective solution based on the range of pre-engineered HPWU systems with MPure™ EDI. Stacks cover flow rates from 5 m³/h to 135 m³/h

• Dimensions (L×W×H mm): 2 400 × 1 300 × 1 600 (one MPure™36 stack)
• Dimensions (L×W×H mm): 4 100 × 1 300 × 1 600 (three MPure™36 stacks)
• Dimensions (L×W×H mm): 4 800 × 1 500 × 2 600 (nine MPure™36 stacks)

Why to choose MEGA high purity water units (HPWU)

• Low-cost HPWU building – ports on both sides for simple interconnection, no frames for modules.
• Each unit is factory assembled and tested to shorten installation time and minimize start-up costs.
• Modularity and redundancy – cube-shaped modules offer different options of interconnection.
• Easy maintenance – only one electrical connection, hydraulic connection with Victaulic couplings.
• Low capital and operating costs (low stack costs and long lifetime, low replacement costs, cleaning frequency and energy consumption).
• Reliability.