With high pure water production EDI (a combination of RO and electrochemical system)
Abstract: the EDI systems have lately been almost all need high pure water company and the end user to accept. EDI has been proved to be the end user and water treatment of the company can be *, the economic benefits of the solution.
Keywords: EDI high pure water RO electrochemical system
EDI systems recently has been almost all need high pure water company and the end user to accept. EDI has been proved to be the end user and water treatment of the company can be *, the economic benefits of the solution. The end user to buy the equipment can eliminate the chemical regeneration, water processing company selling the device to their clients can provide the benefits. Service company also in their own base eliminate the chemical regeneration, through this process requires less than traditional maintenance equipment to water making and gallons for unit sales. History, making pure water system always dependent on ion exchange. These systems by Yang bed + Yin bed + of the mixed bed. In the system of pure water production at the same time, it needs a large number of regeneration. In the past twenty years, reverse osmosis has in industry is accepted, used instead of Yang bed and Yin bed. Now EDI systems also in refining field instead of the mixed bed, and RO together, EDI system will provide a continuous operation, no chemical processing system.

EDI system eliminates acid and corrosion, and their transportation, storage, processing is very dangerous. EDI than complex mixed bed is simple and continuous operation. Require less labor. EDI systems can reduce the ancillary equipment, such as soda acid, alkali metering device storage tanks, PH and device and connected equipment, etc. Its process produces little emission, and the resulting emissions are permitted, in fact most of EDI systems can be recycled water discharge to the entrance of the water treatment system. In many cases, the application of EDI will operate with less, less capital. Mixed bed consumption resin, labor, chemicals, waste water. And the consumption of electrical energy is EDI, sometimes need cleaning film pile and replace. In the same produce a water yield, EDI consumption of workers and wastewater emissions than mixed bed to significantly less. According to feed water quality and water quality, produce 1000 gallons of water each per hour EDI consumption power for-3.0 KW, IN MANY a speech with much less than ion exchange, the operation cost less. EDI system operation of the software design cost than mixed bed less system. RO usually as EDI systems of water.

EDI how work?

EDI module (membrane reactor) is the core of EDI. A simple EDI film pile mainly by two electrical opposite electrode and more modules of unit, a film unit by a fill cation and anion exchange resin freshwater room (D-room), a Yang film, a Yin film, a strong water room (C-room) composition. EDI film containing multiple membrane of unit. In each of the two internal film pile with a 600 V voltage electrode, this is through each film pile of necessary voltage. The positive take positive voltage, negative with load voltage, current in the positive and negative through a membrane between 30 units. As a freshwater room contains Yang resin and Yin resin, it is equivalent to an 8 kilometers thick mixed bed. A film in the direction of the cathode Yang the freshwater room and of strong water room separate, in the other side, Yin film also put fresh water city and strong water separate room. EDI of film and RO with the film with very different, RO membrane allow small particles in the molecular pollutants and ion and water, through, and EDI film like ion exchange resin in polystyrene is made of materials, the only allowed bring appropriate charge of ions through the, basically can't through the water. Through the separation of water for resin regeneration. In the electric field, a molecule of water in the water supply is separated into H + and-OH, be opposite sex charge phase, H + through the Yang to move to the direction of the cathode resin, OH-through the Yin resin move to the direction of the anode. This kind of H + and OH-the transfer of the resin regeneration, Yang membrane allow H + through into the thick water room, Yin membrane allow OH-through the into strong water room, H + and OH-combined with generation of water production. Strong water flow of water in his room will take away the water ion of Yin and Yang. Membranes prevent opposite electric charge of the ion with enter fresh water flow through the freshwater room in the room of the process, ions are resin area, so the effective side membrane (freshwater room) can produce pure water.

Recycling-an important process

In EDI, 90% to 95% of the water to flow for a fresh water room, the water flow parallel through multiple film pile, each film pile are parallel many freshwater room, the one-time through the freshwater room flow out of the is highly purified water. Another 5%-10% was sent to strong water room, 3%-8% as a supplement water out after EDI, 2% used to flush electrode. Strong water recycling increased water conductivity and to increase the EDI system through the current. EDI wastewater treatment by the quality of the water main PH decision. Are usually very good water quality, close to neutral PH. The discharge of water by returning to the strong can recycle water inlet, extremely water contains low concentration of hydrogen, oxygen and chlorine to send to a ventilated place emissions. In the past three years, EDI systems have been many water treatment field accepted, almost half of the newly built today power plant and semiconductor water treatment system and 75% pharmaceutical water system including EDI. Recent research has DEI film paving the road of development, in the years ahead, is going to save water and power of the improvement in quality, especially silicon and boron and efforts to reduce. In the next few years, can predict a better quality of water quality can be made, and to the requirements for quality of the water will be to reduce, especially silicon and hardness requirement.

Attach 1: EDI maintenance needs

EDI in a design good system requires minimal maintenance. The instrument used every 1-2 years needs a calibration. Strongly recommended to put a week pressure, flow, current data do a few times (4-7?) Put on record, for later used to research the problem of dirt and enrichment ratio. When pretreatment doesn't work properly or the system of poor design time, enrichment ratio and pollution will exist. When you find that pollution, in many cases cleaning can restore membrane performance. Pharmaceutical system will be based on the flip pretreatment system clean