Primary Uses of Ultra-Pure Water Equipment:
1. Semiconductor Industry: Used for wafer cutting, cleaning, regeneration, sealing and testing, semiconductor equipment cleaning, and electronic-grade dust-free cloth/dust suit cleaning.
2. Solar Photovoltaic Industry: Monocrystalline Silicon, Polycrystalline Silicon Wafers Cleaning, Solar Cells, Quartz Crucibles, Polycrystalline Silicon Carriers, Photovoltaic Glass, High Purity Silicon Powder.
3. LCD, LED, OLED manufacturing cleaning water, optical camera cleaning, optical material cleaning, conductive glass cleaning.
4. Ultra-pure water for semiconductor integrated circuit boards and PCB manufacturing cleaning.
5. Lithium-ion battery materials (lithium iron phosphorus, ternary materials, lithium battery separators), lead-acid batteries, zinc-manganese battery production water.
6. Pure water for electronic-grade ultra-pure chemicals, nanometer-grade electronic ceramic materials, sharp magnetic materials, and aviation new material production.
7. Non-ferrous metals, precious metal smelting process water, aviation new material production water, capacitor material etching process water, vacuum coating, high-purity inks, etc.
Design Reference Standards for Ultra-Pure Water Equipment:
Design Specifications for Pure Water System in the Electronic Industry GB50685-2011
National Standard of China for Electronic Grade Ultra-Pure Water - GB/T11446.1-2013
General Rules for Electronic Grade Water Test Methods - GB/T 11446.3-2013
Test Method for Resistivity of Electronic Grade Water - GB/T11446.4-2013
Atomic Absorption Spectrophotometric Method for Trace Metals in Electronic Grade Water - GB/T 114465-2013
Method for ion chromatography analysis of trace anions in electronic grade water - GB/T 11446.7-2013
Test Method for Total Organic Carbon in Electronic Grade Water - GB/T 11446.8-2013
Method for testing instrument of particulate matter in electronic grade water - GB/T 11446.9-2013
Test Method for Membrane Filtration and Culture of Total Bacterial Count at Electronic Grade - GB/T 11446.10-2013
※Pure Environmental Protection Brand『Design Advantage』:
1. Personalized one-on-one services, free on-site site survey, considering placement area and access space, and free original water quality testing.
2. Understand the customer's full-day water demand, peak water usage, water quality requirements, and learn about the customer's production process and industry characteristics.
3. Professional team collaboration with design, combined with on-site inspections by individual service personnel, and one-stop water treatment solution services.
4. Intelligent design with precise control, high level of automation, each unit can achieve automatic forward/reverse washing/operation, interlocked protection, alarm indication, 4-20mA data open, capable of remote transmission to DCS control system, truly achieving unattended operation.
5. Segmentally inspect according to process requirements, capable of measuring conductivity, resistivity, pH, ORP, temperature, flow rate, velocity, and pressure, ensuring that water from each process stage meets quality standards and does not contaminate the finished product water downstream. Emphasize process control.
6. Design products tailored to the customer, taking into account a balanced assessment of comprehensive input and operational costs.
※Pure Environmental Protection Brand 『Production Advantages』:
1. Core components are all imported, and we have established long-term cooperative relationships with numerous international brands such as American DOW, Hydranet, GE, Siemens, Rohm and Haas, Grundfos of Denmark, Rosemount, Nippon Paint of Japan, and Schneider, ensuring reliable product quality.
2. Suppliers conduct product evaluations, eliminating suppliers with poor quality and service, and selecting the best to enter the qualified supplier system.
3. Strictly adhere to the quality management system; quality is paramount. Conduct incoming material appearance and performance inspections -- production process inspections -- final product quality checks.
4. Production personnel produce according to corresponding numbers, arranged in shifts with team-based scheduling, responsible for their assigned tasks, and a robust performance evaluation and traceability system are established.
5. Pre-shipment trial operation inspection and electrical point operation test to ensure delivery of qualified products to the customer.
※ Pure Eco-Friendly Brand 『After-Sales Advantage 』:
1. Professional installation and after-sales team providing one-on-one service, enhancing the timeliness of post-installation after-sales support and boosting customer satisfaction.
2. Establish a post-installation after-sales service mechanism, conduct performance evaluations, set up a customer service department, a complaint hotline, and promptly address customer concerns.
3. Full guidance and training throughout the installation and debugging process, including theoretical training, hands-on machine operation training, and general troubleshooting training.
4. Establish customer electronic profiles, conduct monthly phone follow-ups, and promptly provide methods and suggestions to reduce equipment operating costs.
5. Multiple channels for after-sales feedback, offering nationwide maintenance and service support, quick response, rapid handling, 24/7 service.
6. Firm Commitment: Two-year free warranty on the entire unit, lifetime free technical support.
I. Recommended Process for Producing Ultra-Pure Water:
1. Grade 1 RO+EDI+Blending: Product water resistivity ≥ 18 MΩ·cm (25°C), other specifications meet the requirements of electronic grade ultra-pure water.
Source Water → Source Water Tank → Boost Pump → Sand Filter → Carbon Filter → Softener/Scale Inhibitor → Security Filter → High-Pressure Pump → First Stage Reverse Osmosis → First Stage Storage Tank → Boost Pump → Fine Filter → EDI Desalination Unit → Ultra-Pure Water Tank (recommended with nitrogen protection) → Feed Pump → Polishing Mixed Bed → UV/TOC → Fine Filter → Water Usage Point → Return Water (recommended with pipeline circulation, no dead water)
Note: This process requires good quality of raw water; otherwise, it may cause irreparable damage to the EDI desalination system.
2. Grade 2 RO + EDI + Mixed-bed: Product water resistivity ≥ 18 MΩ·cm (25℃), other specifications meet the standard for electronic-grade ultra-pure water.
Source Water → Source Water Tank → Boost Pump → Sand Filter → Carbon Filter → Softener/Scale Inhibitor → Security Filter → High-Pressure Pump → Primary Reverse Osmosis → Primary Water Tank → PH Adjustment → High-Pressure Pump → Secondary Reverse Osmosis → Secondary Water Tank → Boost Pump → Fine Filter → EDI Desalination Unit → Ultra-Pure Water Tank (recommended with nitrogen protection) → Feed Pump → Polishing Mixed Bed → UV/TOC → Fine Filter → Water Point → Return Water (recommended with pipeline circulation, no dead water)
Note: If there is a high requirement for particulate matter and TOC, it is recommended to set a dedicated ultrafiltration (UF) membrane (Asahi Kasei from Japan) for removing particulate matter and TOC in the later stage.
3. Disk filter + UF + Secondary RO + EDI + mixed-turbulent: Product water resistivity ≥ 18 MΩ·cm (25℃), other specifications comply with electronic grade ultra-pure water standards.
Source Water → Source Water Tank → Booster Pump → Plate Filter → Bag Filter → Ultrafiltration UF → Ultrafiltration Water Tank → Intermediate Pump → Security Filter → High-Pressure Pump → First Stage Reverse Osmosis → First Stage Water Tank → PH Adjustment → High-Pressure Pump → Second Stage Reverse Osmosis → Second Stage Water Tank → Booster Pump → Precision Filter → EDI Desalination Unit → Ultra-Pure Water Tank (Recommended Nitrogen Protection) → Feed Pump → Polishing Mixed Bed → UV/TOC → Precision Filter → Water Usage Points → Return Water (Recommended Pipeline Recirculation, No Dead Water)
Note:
1. If the requirements for particulate matter and TOC are high, it is recommended to set a dedicated ultrafiltration (UF) membrane (Asahi Kasei from Japan) for removing particulate matter and TOC at the downstream stage.
2. The aforementioned process is the full-membrane process
3. Grade 1 RO + Grade 3 Mixed: Water Production Resistivity ≥ 18 MΩ·cm (25°C), other specifications comply with electronic grade ultra-pure water standards.
Source Water → Activated Carbon Filter → 10um Filter → 5um Filter → High-Pressure Pump → Reverse Osmosis RO System → First Polishing Mixed Bed → Second Polishing Mixed Bed → Third Polishing Mixed Bed → Fine Filter → Ultra-Pure Water Tank (Suggested Nitrogen Protection) → Feed Pump → UV/TOC → Fine Filter → Water Point → Return Water (Suggested Pipe Circulation, No Dead Water)
Note: Suitable for small ultra-pure water systems; flow range: 50L/H - 200L/H
For more product details, please call our 24-hour hotline: 18550863818; or the national hotline: 0512-69390898.
We will provide you with detailed plans, drawings, and competitive quotes for your reference and selection!
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Section II: Introduction to the Core Technology of EDI Ultra-Pure Water
1. Ultrafiltration (UF) System
The primary function of the ultrafiltration system is to separate contaminants such as suspended large molecules, colloids, slime, microorganisms, and organic matter that can cause fouling in reverse osmosis membranes. This includes the backwashing and sterilization dosing system, ultrafiltration units, and backwashing pumps. Ultrafiltration (UF for short) is a physical separation process that uses pressure as the driving force to separate liquids based on the different pore sizes of the ultrafiltration membrane. Ultrafiltration membranes are typically asymmetric in structure, consisting of a thin, ultra-thin layer (usually less than 1μm) with a certain size of pores, and a thicker layer (usually 125μm) with a spongy or finger-like structure. The former serves the separation function, while the latter provides support. The typical pore size of ultrafiltration membranes ranges from 0.01 to 0.1 micrometers, offering a high removal rate for bacteria, most pathogens, colloids, and sludge. The smaller the nominal pore size of the membrane, the higher the removal rate. Ultrafiltration membranes are generally made of high molecular polymer materials. For ultrafiltration, the "screening" theory is commonly used to describe the separation mechanism. The ideal ultrafiltration membrane separation process is that under pressure, the solvent and small solute particles in the feed solution pass through the low-pressure side of the membrane from the high-pressure side, while larger molecules and particles that are larger than the membrane pore size are blocked by the membrane, causing the feed solution to gradually concentrate; larger molecules, colloids, proteins, and particles in the solution are retained by the ultrafiltration membrane and recovered as concentrate. However, in actual separation processes, the pore size of the membrane and the chemical properties of the membrane surface play different retention roles, so the ultrafiltration phenomenon cannot be simply analyzed. Ultrafiltration membranes have important characteristics in terms of their pore structure, as well as the chemical properties of the membrane surface. Performance indicators of ultrafiltration membranes include permeate flux and retention rate. The pressure resistance, cleaning resistance, and temperature resistance of ultrafiltration membranes are crucial for industrial applications.
The membrane component structure includes plate, rolled, tubular, and hollow fiber types, and is divided into three categories based on the location of the separation layer: internal pressure, external pressure, and internal and external pressure. Hollow fiber membranes are one of the main types of ultrafiltration membranes, with a capillary-like shape, spun from the melt. The inner or outer surface is a dense layer, also known as the active layer, while the interior is a porous support. The dense layer is densely packed with micropores, and the separation is achieved based on whether the solution components can pass through these micropores. The feed liquid flows under pressure through the hollow fiber membrane's inner pores or outer surface, and the filtered liquid exits from the other side.
2. Reverse Osmosis (RO) System
Reverse osmosis (RO) membranes, also known as anti-osmosis membranes, are a high-tech membrane separation technology invented by Lob (Loeb) and Sourirtajan at the University of California, Los Angeles, in 1960. Their pore sizes are as small as nanometers (1 nanometer = 10^-9 meters). Under certain pressure, H2O molecules can pass through the RO membrane, while inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, and other impurities in the source water cannot pass through. This allows for a strict separation of pure water that can pass through and concentrated water that cannot.
Principle: Osmosis is a physical phenomenon where water from two bodies of water with different salt concentrations, separated by a semi-permeable membrane, will pass through the membrane until the concentrations are equalized. However, this process takes a long time and is known as natural osmosis. But if pressure is applied to the side with higher salt concentration, the osmosis can be stopped, and this pressure is called osmotic pressure. Increasing the pressure can make the water permeate in the opposite direction, leaving the salt behind. Therefore, the principle of reverse osmosis desalination is to apply a pressure greater than the natural osmotic pressure to saltwater (such as raw water), forcing the water molecules to permeate in the opposite direction to the membrane, resulting in clean water on the other side, effectively removing salt from the water. This is the principle behind reverse osmosis desalination.
The reverse osmosis membranes utilize aromatic polyamide spiral wound composite membranes. The reverse osmosis system consists of composite membrane elements, high-pressure pumps, glass-fiber reinforced pressure vessels, chemical cleaning units, supports, and an instrument control cabinet. Equipped with a local control panel, which is fitted with various local instruments and control buttons. The reverse osmosis desalination unit is controlled by a PLC for automatic operation. It is also equipped with flowmeters, pressure gauges, conductivity meters, and more.
3. pH Adjustment System
Due to the RO membrane's inability to remove carbon dioxide, it remains in the reverse osmosis permeate, forming carbonic acid and increasing conductivity. By adding alkali to the primary RO permeate to adjust the pH to around 8.2, carbon dioxide can be converted into bicarbonate ions, which are then removed by the secondary RO membrane, ensuring the secondary RO permeate meets specifications.
The pH adjustment system is controlled fully automatically, equipped with a metering pump to inject diluted NaOH solution into the pipeline accurately. The overall design is lightweight with precise speed control, unaffected by heat sources or electromagnetic interference. Through real-time monitoring by the pH online monitoring instrument, chemicals are automatically added to ensure stable water quality of the second-stage RO production.
4. EDI Desalination System
EDI equipment, Continuous Electrical Deionization (EDI), utilizes mixed ion exchange resins to adsorb the cations and anions in the feed water. These adsorbed ions are then removed under the action of direct current voltage by passing through respective cation and anion exchange membranes. This process involves the electro-regeneration of the ion exchange resins, eliminating the need for acid and alkali regeneration. This new technology can replace traditional ion exchange (DI) units to produce ultra-pure water with resistivity ≥15MΩ.CM. The working principle of the ion exchange membrane is similar to that of the ion exchange resin, selectively allowing ions to pass through. A cation exchange membrane only permits cations to pass, while an anion exchange membrane only allows anions to pass. Filling the space between a pair of cation and anion exchange membranes with mixed ion exchange resin forms an EDI unit. The space occupied by the mixed ion exchange resin between the cation and anion exchange membranes is known as the freshwater chamber. Arranging a certain number of EDI units in series, with alternating cation and anion exchange membranes, and adding special ion exchange resins between the membranes, forms a brine chamber. Under the applied direct current voltage, in the freshwater chamber, the cations and anions in the ion exchange resin migrate towards the positive and negative poles, respectively, passing through the cation and anion exchange membranes into the brine chamber. Meanwhile, the ions in the feed water are adsorbed by the ion exchange resin, occupying the space left by the ion electro-migration. In fact, ion migration and adsorption occur simultaneously and continuously. Through this process, the ions in the feed water pass through the ion exchange membranes into the brine chamber and are removed, becoming desalinated water. Negatively charged anions (e.g., OH-, Cl-) are attracted to the positive pole (+) and pass through the anion exchange membrane into the adjacent brine chamber. Later, these ions encounter the nearby cation exchange membrane during their migration towards the positive pole, which does not allow anions to pass, thus these ions are blocked in the brine. Positively charged cations (e.g., Na+, H+) in the freshwater are blocked in the brine chamber in a similar manner. In the brine chamber, the ions passing through the cation and anion membranes maintain electrical neutrality. The electrical current and ion migration in the EDI component are proportional. The electrical current consists of two parts: one from the migration of the removed ions, and the other from the migration of H+ and OH- ions produced by the electrical ionization of water. In the EDI component, there is a high voltage gradient, which causes the water to electrolyze and produce a large amount of H+ and OH-. These locally produced H+ and OH- continuously regenerate the ion exchange resins. The ion exchange resins in the EDI component can be divided into two parts: the working resin and the polishing resin, with the boundary between them referred to as the working front. The working resin is responsible for removing most of the ions, while the polishing resin is responsible for removing difficult-to-remove ions, such as weak electrolytes.
Features of EDI
1. No need for acid/base regeneration, no acid/base storage or dilution transport facilities required, safe and reliable to use, avoiding worker exposure to acids and bases
2. Saved再生water and wastewater treatment facilities
3. Reduced operation and maintenance costs
4. Compact footprint, easy installation, high water yield (up to 90-95%)
5. Continuous operation, stable product water quality, no shutdown due to regeneration
5. Polished Mixed Bed System
Polished mixed bed is generally used at the end of ultra-pure water treatment systems, based on the principle of resin ion exchange. The container is filled with non-regeneration polishing mixed bed nuclear-grade ion exchange resin, with ion forms of H and OH. As a terminal desalination unit, it can elevate the resistivity of the upstream feed water to the user's required level and also has certain control capabilities over TOC and SiO2.
Polished mixed bed ion exchange requires specific feedwater quality; it must be the product water from the cation, anion, or mixed bed ion exchange systems, or the product water from an EDI continuous electrical deionization system. Only when the feedwater meets these requirements can the polished mixed bed ion exchange operate stably and long-term.
6. UV Sterilizer/TOC Remover
UV Sterilizer/TOC Remover is a physical sterilization method. After bacteria are exposed to ultraviolet light, the energy of the ultraviolet spectrum is absorbed by the bacterial nucleic acids, altering their vitality. This disruption leads to obstacles in the synthesis of proteins and enzymes within the bacteria, resulting in microbial mutation or death. According to tests, ultraviolet light with a wavelength of 200-250nm has sterilization capabilities, with the best performance at 253.7nm. Ultraviolet light at 185nm is particularly effective for TOC removal. The equipment's consumables are the lamps, which require regular replacement with a lifespan of ≥9,000 hours.
Section 3: National Standard for Electronic Grade Ultra-Pure Water (GB/T11446.1-2013)
Section 4: Selected Classic Customer Cases:
Section 5: National Warranty and Service Network
1. Professional installation and after-sales team offering one-on-one service, enhancing the timeliness of post-installation after-sales support and boosting customer satisfaction.
2. Establish a post-installation after-sales service mechanism, conduct performance evaluations, set up a customer service department, a complaint window, and promptly address customer concerns.
3. Full guidance and training throughout the installation and debugging process, including theoretical training, hands-on machine operation training, and general troubleshooting training.
4. Establish customer electronic profiles, conduct monthly phone follow-ups, and promptly provide methods and suggestions for reducing equipment operating costs.
5. Multi-channel after-sales feedback, nationwide after-sales maintenance service, quick response, fast handling, 24/7 service.
6. We solemnly promise: Two-year free warranty for the entire unit, lifetime free technical support.
For more product details, please call our 24-hour hotline: 18550863818; or the national hotline: 0512-69390898.
We will provide you with detailed plans, drawings, and competitive quotes for your reference and selection!
※ Call for consultation, enjoy 10% off! Welcome to call!
