Ultra pure water was originally produced by the American technology industry using distillation, deionization, reverse osmosis technology, or other appropriate supercritical fine technology to develop ultra pure materials (semiconductor component materials, nano fine ceramic materials, etc.). Nowadays, ultra pure water has been widely used in fields such as biology, medicine, and automobiles. This type of water has almost no impurities except for water molecules (H2O), and there are no organic substances such as bacteria, viruses, chlorine containing dioxins, etc. Of course, there are no mineral trace elements needed by the human body. Ultra pure water has no hardness and a sweet taste, often referred to as soft water, which can be consumed directly or boiled for drinking. Ultra pure water is a level that is difficult to achieve with general processes. If the electrical resistivity of water is greater than 18M Ω* cm and close to 18.3M Ω* cm, it is called ultra pure water.

A water treatment equipment that uses pre-treatment, reverse osmosis technology, ultra purification treatment, and post-treatment methods to almost completely remove conductive media from water, and also removes non dissociative colloidal substances, gases, and organic matter from water to a very low level.

The desalination core component of ultra pure water system equipment is the imported reverse osmosis membrane module. Ultra pure water system equipment usually consists of a pretreatment part, a reverse osmosis host part, and a post-treatment part.

1. Pre treatment reasons include quartz sand filter, activated carbon filter, fully automatic water softener, precision filter (our company uses fully automatic control valve head), and ultrafiltration system can also be used as pre-treatment, but usually the engineering cost is high. The main purpose of pretreatment is to remove sediment, rust, colloidal substances, suspended solids, color, odor, and biochemical organic matter contained in raw water. When the hardness of the raw water is high, a fully automatic water softener can be selected, which effectively protects the reverse osmosis membrane and extends its service life.

2. The reverse osmosis host mainly consists of a high-pressure pump, membrane housing, imported reverse osmosis membrane components, online instruments, control electrical components, etc. As long as the number of membranes and the model selection of pumps are appropriate, the desalination rate and water production of the reverse osmosis host can reach the rated indicators, and the effluent conductivity can be guaranteed to be below ≤ 10us/CM (the original water conductivity is less than 500us/cm, and the working temperature is 1-40 ℃)

3. The post-processing part is to further refine the pure water produced by reverse osmosis to produce ultrapure water, usually using ion exchange mixed bed equipment or EDI equipment. According to customer requirements, the effluent resistance can reach 18.2 M Ω CM， If it is applied to the direct drinking water process, a sterilization device, usually a UV sterilizer or ozone generator, can be added to make the produced water meet the direct drinking standard.

The exchange reaction takes place in the pure chemical chamber of the module, where anion exchange resins exchange anions (such as chloride ion C1) in dissolved salts with their hydrogen and oxygen ions (OH). Correspondingly, cation exchange resins use their hydrogen ions (H) to exchange cations (such as Na) in dissolved salts.

Apply a direct current electric field between the anode (+) and cathode (-) located at both ends of the module. The potential causes ions exchanged onto the resin to migrate along the surface of the resin particles and enter the concentrated water chamber through the membrane. The anode attracts negative ions (such as OH, CI), which enter the adjacent concentrated water stream through the anion membrane but are blocked by the cation selective membrane, thus remaining in the concentrated water stream. The cathode attracts cations (such as H, Na) from pure water flow. These ions pass through the cation selective membrane and enter the adjacent concentrated water flow, but are blocked by the anion membrane, thus remaining in the concentrated water flow. When water flows through these two parallel chambers, ions are removed in the pure water chamber and accumulate in the adjacent concentrated water flow, which then carries them away from the module. The use of ion exchange resin in pure and concentrated water is the key to ElectropupreEDI technology and patents. An important phenomenon occurs in the ion exchange resin of the pure water chamber. In localized areas with high potential differences, the electrochemical reaction decomposes water to produce a large amount of H and OH. The local production of H and OH in mixed bed ion exchange resins allows for continuous regeneration of the resin and membrane without the need for chemical additives.

EDI membrane stack is composed of a certain number of units sandwiched between two electrodes. There are two different types of chambers within each unit: the fresh water chamber for desalination and the concentrated water chamber for collecting impurity ions removed. Fill the freshwater chamber with mixed cation and anion exchange resins located between two membranes: the cation exchange membrane that allows only cations to pass through and the anion exchange membrane that allows only anions to pass through. The resin bed utilizes direct current applied at both ends of the chamber for continuous regeneration. The voltage causes water molecules in the inlet water to decompose into H+and OH -. These ions in the water are attracted by the corresponding electrodes and migrate through the cation and anion exchange resins towards the corresponding membranes. When these ions enter the concentration chamber through the exchange membrane, H+and OH - combine to form water. The generation and migration of H+and OH - are the mechanisms by which resins can achieve continuous regeneration.

When impurity ions such as Na+and CI - in the influent adsorb onto the corresponding ion exchange resin, these impurity ions will undergo ion exchange reactions similar to those in a regular mixed bed, and correspondingly displace H+and OH -. Once impurity ions in the ion exchange resin are also added to the migration of H+and OH - towards the exchange membrane, these ions will continuously pass through the resin until they pass through the exchange membrane and enter the concentrated water chamber. These impurity ions cannot further migrate towards the corresponding electrode due to the blocking effect of adjacent compartment exchange membranes, so they can concentrate in the concentrated water chamber, and then the concentrated water containing impurity ions can be discharged from the membrane stack.

working principle

1. Water enters the EDI system, with the main part flowing into the resin/membrane, while the other part flows along the outside of the template to wash away ions that have passed through the membrane.

2. Resin intercepts dissolved ions in water.

3. Under the action of the electrode, the trapped ions move towards the positive electrode, while the anions move towards the negative electrode.

4. Cations pass through the cation membrane and are expelled from the resin/membrane.

5. Anions pass through the anion membrane and are expelled from the resin/membrane.

6. The concentrated ions are discharged from the wastewater flow path.

7. Non ionic water flows out from the resin/membrane.

feature

1: All components are imported products with advanced technology

2: Reliable quality, high degree of integration, easy to expand, increasing the number of membranes can increase processing capacity

3: High degree of automation, automatic shutdown in case of malfunction, with automatic protection function

4: The membrane module is made of composite membrane rolls, exhibiting higher solute separation and permeation rates

5: Low energy consumption, high water utilization efficiency, and low operating costs

6: Reasonable structure and small footprint

7: Advanced membrane protection system, when the equipment is turned off, the desalinated water can automatically flush the membrane surface pollutants clean, extending the membrane life

8. The system has no vulnerable parts, does not require extensive maintenance, and operates effectively for a long time

9: The equipment is designed with a membrane cleaning system and a scale inhibition system

process flow

The process of preparing super water in the pharmaceutical industry can be roughly divided into the following categories:

1. Raw water → Raw water booster pump → Multi medium filter → Activated carbon filter → Softener → Precision filter → Primary reverse osmosis equipment → Intermediate water tank → Intermediate water pump → Ion exchanger → Purified water tank → Pure water pump → UV sterilizer → Micro porous filter → Water point

2. Raw water → Raw water booster pump → Multi medium filter → Activated carbon filter → Softener → Precision filter → First stage reverse osmosis → PH adjustment → Intermediate water tank → Second stage reverse osmosis (with positive charge on the surface of the reverse osmosis membrane) → Purified water tank → Pure water pump → UV sterilizer → Micro pore filter → Water point

3. Raw water → Raw water booster pump → Multi medium filter → Activated carbon filter → Softener → Precision filter → Primary reverse osmosis machine → Intermediate water tank → Intermediate water pump → EDI system → Purified water tank → Pure water pump → UV sterilizer → Micro porous filter → Water point

main purposefold

1. Production and cleaning of ultra pure materials and reagents

2. Production and cleaning of electronic products

3. Production of battery products 4. Production and cleaning of semiconductor products 5. Production and cleaning of circuit boards

6. Production of other high-tech precision products