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EDI Device
  Generally speaking, EDI ultra pure water equipment is mainly used for boiler make-up water in power, petrochemical, metallurgy, paper and other industries; Ultra pure water for daily chemical, pharmaceutical, electronic semiconductor, photovoltaic and other industries. Because of its stable effluent, energy conservation and environmental protection, it is gradually replacing the original mixed bed process.
Principle
  Water from urban water sources contains sodium, calcium, magnesium, chloride, nitrate, bicarbonate, silica and other dissolved salts. These salts consist of negatively charged ions and positively charged ions. More than 99% of ions can be removed by proper reverse osmosis (RO) treatment. Urban water sources also contain trace metals, dissolved gases (such as CO2) and other weakly ionized compounds, which must be removed in industrial applications (such as boron and silicon).
  The conductivity of RO permeate water (EDI inlet water) shall generally be ≤ 43 µ S/cm. According to different application fields, the resistivity of ultrapure water or deionized water generally varies between 2-18.2M Ω. cm.   The ion exchange reaction is carried out in the purification chamber of the module, where the anion exchange resin releases hydroxyl ions (OH -) and obtains anions from dissolved salts (such as chlorides and Cl -). Similarly, cation exchange resins release hydrogen ions (H+) and obtain cations from dissolved salts (such as sodium and Na+).   A DC electric field is applied through the anode (+) and cathode (-) placed at one end of the module. The voltage drives these absorbed ions to move along the surface of the resin ball, and then enter the concentrated water chamber through the film.   The negatively charged anions (such as OH -, Cl -) are attracted to the anode (+). These ions pass through the anion selective membrane and enter the adjacent concentrated water chamber, but will not pass through the adjacent cation selective membrane and remain in the concentrated water chamber, and are properly treated. Positive cations (such as H+, Na+) in the fresh water chamber are attracted to the cathode (-). These ions pass through the cation selective membrane and enter the adjacent concentrated water chamber, where they are blocked by the adjacent anion selective membrane and properly treated.   In the concentrated water chamber, it is still electrically neutral. Ions transported from both directions neutralize each other. The current flowing from the power source is proportional to the number of moving ions. Two streams of water (H+and OH -) trend ions are transported and added to the required current.   When the water flows through two different types of chambers, the ions in the purification chamber will be exhausted and collected into the adjacent concentrated water stream, which will take away the removed ions from the components.   Using ion exchange resin in purification chamber and (or) concentrated water chamber is a key of EDI technology. An important phenomenon will also occur in the purification chamber. In a specific area with high potential gradient, electrochemical "decomposition" can make water produce a large number of H+and OH - ions. The H+and OH - ions generated in these areas can regenerate the resin continuously in the mixed ion exchange resin, and form a film that does not require additional chemical reagents.   Proper treatment of EDI feed water is a basic requirement for ideal performance and trouble free operation of EDI system (in fact, it is the same for any deionization system based on ion exchange resin). Impurities in the influent flow will have a negative impact on the deionized components, either increasing the maintenance frequency or reducing the service life of the components.
EDI Device
  ☆ EDI devices can include all equipment, pipes, valves, control systems and measuring instruments necessary for the system.   ☆ EDI membrane components are installed on the combination frame, which shall be equipped with all pipes and joints, as well as all supports, fasteners, clamps and other accessories;   ☆ The performance, configuration points and quantity of instruments and meters equipped with EDI system will meet the requirements of safe, stable and reliable operation of the system.   ☆ EDI equipment is assembled on a frame by several membrane blocks and supplied in complete sets. The device is equipped with all modules, rectifiers, instruments, controls, pipes, valves, etc. that meet the requirements of effluent quality and quantity.   ☆ The design of EDI composite frame shall meet the seismic intensity of the plant site and the expansion requirements of components. EDI device shall be designed to avoid concentrated water pressure higher than fresh water pressure.   ☆ EDI concentrated water discharge is equipped with a flow control valve to control the recovery rate of EDI, and the concentrated water returns to the intermediate water tank.   ☆ The product water pipe and concentrated water pipe of EDI device are equipped with sampling points. The number and location of sampling can effectively diagnose and determine the operating conditions of the system.   ☆ EDI outlet is equipped with online resistance (conductivity) meter and permeate flow meter (with cumulative and instantaneous values and zero return function), and all online instruments are imported from ELFIN; The effluent recovery rate of EDI device in operation is above 90%.   ☆ EDI device is equipped with a local instrument panel to display relevant process parameters of EDI on the local panel. The flow meter, pressure gauge, resistivity meter, etc. and valves configured for EDI device can meet the requirements of EDI for automatic control.   ☆ Each EDI membrane block is equipped with a completely independent DC power control box, which can ensure that any membrane block will automatically cut off its power supply in case of overheating due to operation, while other modules in the system can still operate normally.   ☆ EDI device adopts unit membrane block assembly, which is convenient for maintenance and replacement.
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