Diode ultrapure water equipment, semi-conductor ultrapure water equipment, industry ultrapure water equipment 　　Brief introduction of EDI ultrapure water products 　　For recent decades, mixed bed ion exchange technology has served as the standard technology of preparing ultrapure water all the time. Due to the need of periodic regeneration, and using a large amount of chemicals(acid-base) and pure water on the course of regeneration, which can result in the environmental pollution, as a result, we have to develop non-acid-base ultrapure water system. 　　Just because traditional ion exchange can’t meet the requirements of modern industry and environtental protection, we make the combination of membrane, resin and electrochemical principle together, which is an EDI technology, it is a revolution of water treatment technology. We use the electricity to make the regeneration of ion exchange resin come true, without acid-base, thus it will satisfy the requirements of world environmental protection. 　　Since 1986, industrialize the EDI membrane pack, thousands of EDI system have been installed in the world, we have developed vigorously in pharmacy, semi-conductor, electricity and surface polishing etc, meanwhile, we also have widely used EDI system in the field of waste water treatment equipment, beverage and microorganism etc. 　　EDI operating principle: 　　EDI device is to put the ion exchange resin between anion and cation membrane, which forms EDI unit. EDI operating principle as the chart shows. EDI components will separate a certain number of EDI unit with reticulation, forming strong water chamber. At both ends of unit group, installing anion and cation electrode. Under the push of direct current, the anion and cation ion are removed in the fresh water chamber, then the water goes through the anion and cation ion exchange membrane, enters into the strong water chamber. The water in strong water chamber will bring ion out from system, we call this part of water strong water. Generally speaking, the feed water of EDI equipment is the reverse osmosis pure water. Reverse osmosis pure water resistance is 40-2μS/cm(25℃). The resistance of EDI pure water can reach to 18MΩ.cm(25℃), but according to the prupose of deionization and the system configuration, EDI pure water is suitable for pure water whose preperation resistance required 1-18.2MΩ.cm.(25℃). 　　EDI technology has been widely accepted by pharmacy industry, microelectronics industry, electricity generation industry and laboratory. It also has spread widely over surface cleaning, surface coating, electrolytic industry and chemical industry. 　　EDI device is put after the RO system, it is the replacement of traditional mixed ion exchange technology (MB-DI), this EDI technology can produce stable deionized water. 　　Compared with mixed ion exchange technology, EDI technology has the following advantages: 　　①stable water quality 　　②easy automation 　　③regeneration won’t cause stop 　　④no need of chemical regeneration 　　⑤low operation costs 　　⑥small workshop area 　　⑦no sewage discharge 　　Chemical cleaning and regeneration of EDI equipment, EDI equipment, ultrapure water equipment, resin regeneration 　　There are following reasons of membrane module blocking: particle/glue plugging, inorganic plugging, microorganism plugging 　　Cleaning methods Time(min) remarks: 　　acid wash 30-60 　　caustic wash 30-60 　　saline wash 5-30 　　disinfection 25-40 　　flush ≥50 　　regeneration ≥120 　　According to systematic technology requirements, until the resistance of water meets the needs. 　　The dosage of liquid medicine for washing single membrane module 　　1. temprature of acid wash 15-25℃ 　　2. temprature of caustic wash 25-30℃ 　　3. the liquid medicine must be RO production water or deionized water better than RO production water; 　　1.0t/h 80L 　　2.0t/h 110L 　　3.0t/h 150L 　　5.0t/h 200L 　　If the number of membrane module is more than 1, the quantity of liquid medicine should time the number of membrane module. 　　The regeneration of EDI equipment membrane module: 　　Confirm that there is no residues of chemicals in the EDI membrane module. 　　Make the system construct closed-circuit self-circulation channel. 　　According to the normal operationg mode, to adjust all the flow and pressure well. 　　Then connect EDI to power, regulating current will take steps to load current to EDI from 1A (maximum current less than or equal to 6A) 　　Till the production water resistance reach the technological requirements or≥14.5MΩ.cm 　　Tips: the regeneration of membrane module will take a longt time, sometime it will take as long as 10-24 hours even more time. 　　Precautions of EDI equipment operation and maintenance: 　　Attention: before test run, operation and maintenance, please read the operation and maintenance manual carefully provided by EDI manufacturer. This note is only for the test run, the precautions of operation and maintenance, you should read the operation and maintenance manual provided by EDI manufaturer.