Primary Application of Ultra-Pure Water Equipment:
1. Semiconductor Industry: Used for wafer cutting (6-12 inches), cleaning, regeneration, packaging and testing water, 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 cleaning semiconductor integrated circuit boards and printed circuit boards production.
5. Lithium-ion battery materials (lithium iron phosphate, ternary materials, lithium battery separators), lead-acid batteries, zinc-manganese battery production water.
6. Pure water for electronic-grade ultra-pure chemicals, nano-grade electronic ceramic materials, sharp magnetic materials, and aviation new material production.
7. Non-ferrous metals, precious metal refining 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 Specification for Pure Water System in Electronic Industry GB50685-2011
Chinese National Specification 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/T114465-2013
Method for Ion Chromatographic Analysis of Trace Anions in Electronic Grade Water - GB/T11446.7-2013
Test Method for Total Organic Carbon in Electronic Grade Water - GB/T 11446.8-2013
Method for Testing Instrumentation of Electronic Grade Water Particles - GB/T 11446.9-2013
Test Method for Filter Membrane Culture of Total Bacterial Count at Electronic Grade - GB/T 11446.10-2013
※Chinese Pure Environmental Protection Brand 『Design Advantages』:
1. Personalized one-on-one service, complimentary on-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, quality requirements, and the customer's production process and industry characteristics.
3. Professional team collaboration with design, combined with on-site inspections by dedicated service personnel, and one-stop water treatment solution services.
4. Intelligent design with precise control and high level of automation. Units can perform automatic forward/washback/operation, with interlock protection and alarm indication. Features 4-20mA data openness, allowing remote transmission to the DCS central control system, truly achieving unattended operation.
5. Segmented testing according to process requirements, capable of measuring conductivity, resistivity, pH, ORP, temperature, flow rate, velocity, pressure, and other parameters. Ensures that water quality meets standards at every process stage, preventing contamination of downstream finished products, and emphasizing process control.
6. Design products that balance comprehensive investment and operating costs, catering to the client's needs.
※Chinese 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 the U.S. Dow, Hydronix, GE, Siemens, Rhone-Poulenc, Grundfos of Denmark, Rosemount, Nippon Paint of Japan, and Schneider, ensuring reliable product quality.
2. Suppliers conduct product evaluations, eliminating subpar suppliers with poor quality and service, and prioritizing the inclusion of qualified suppliers into the system.
3. Strictly adhere to the quality management system; quality is paramount. Conduct incoming material appearance and performance inspections, in-process inspections, and final product quality checks.
4. Production staff produce according to assigned numbers, schedule in groups, with responsibility-based division of labor, and establish a performance assessment system with strong traceability.
5. Pre-shipment trial run inspection and electrical point operation test to ensure delivery of qualified products to the customer.
※Pure Environmental Protection Brand 'After-Sales Advantages':
1. Professional installation and after-sales team providing one-on-one service, enhancing the timeliness of post-installation after-sales service 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. Comprehensive 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 operation costs.
5. Multiple channels for after-sales feedback, offering nationwide maintenance and service support, quick response, rapid handling, 24/7 service.
6. We solemnly promise: Two-year free warranty for the entire unit, lifetime free technical support.
I. Recommended Ultra-Pure Water Production Process:
1. Grade 1 RO + EDI + Mixed: Product water resistivity ≥ 18 MΩ·cm (25°C), other specifications meet the standard of electronic grade ultra-pure water
Source Water → Source Water Tank → Booster Pump → Sand Filter → Carbon Filter → Softener/Scale Inhibitor → Security Filter → High-Pressure Pump → First Stage Reverse Osmosis → First Stage Storage Tank → Booster Pump → Fine Filter → EDI Demineralization System → Ultra-Pure Storage 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 the raw water quality to be good; otherwise, it may cause irreparable damage to the EDI desalination system.
2. Grade 2 RO + EDI + Mixed Flow: Water Production Resistivity ≥ 18 MΩ·cm (25°C), all other specifications meet the electronic grade ultra-pure water standard.
Source Water → Source Water Tank → Booster Pump → Sand Filter → Carbon Filter → Softener/Scale Inhibitor → Security Filter → High-Pressure Pump → Primary Reverse Osmosis → Primary Storage Tank → PH Adjustment → High-Pressure Pump → Secondary Reverse Osmosis → Secondary Storage Tank → Booster 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 particle removal and TOC removal in the downstream section.
3. Disk filter + UF + Secondary RO + EDI + mixed-bed: Product water resistivity ≥ 18 MΩ·cm (25°C), other specifications meet the standards for electronic grade ultra-pure water.
Source Water → Source Water Tank → Pressure Booster Pump → Plate Filter → Bag Filter → Ultrafiltration UF → Ultrafiltration Water Tank → Intermediate Pump → Security Filter → High Pressure Pump → Primary Reverse Osmosis → Primary Water Tank → PH Adjustment → High Pressure Pump → Secondary Reverse Osmosis → Secondary Water Tank → Pressure Booster Pump → Fine Filter → EDI Deionization 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:
1. If the requirement for microparticles is high, and the Total Organic Carbon (TOC) requirement is stringent, it is recommended to set a dedicated ultrafiltration (UF) membrane for particle removal and TOC reduction at the later stage, such as the Asahi Kasei UF membrane (from Japan).
2. The above process is the full-membrane process
3. Grade 1 RO + Triple Mixed: Product water resistivity ≥ 18 MΩ·cm (25°C), other specifications comply with electronic grade ultra-pure water standard.
Source Water → Activated Carbon Filter Core → 10um Filter Core → 5um Filter Core → High Pressure Pump → Reverse Osmosis (RO) System → First Grade Polished Mixed Bed → Second Grade Polished Mixed Bed → Third Grade Polished Mixed Bed → Fine Filter → Ultra-Pure Water Tank (Suggested Nitrogen Protection) → Transfer Pump → UV/TOC → Fine Filter → Water Usage Point → Return Water (Suggested Pipeline Circulation, No Dead Water)
Note: Suitable for small ultra-pure water units; Flow range: 50L/H - 200L/H
For more product details, please call our 24-hour hotline: 18550863818; or our national hotline: 0512-69390898.
We will provide you with detailed plans, drawings, and competitive quotes for your reference and selection!
※ Phone consultation, enjoy 10% off! Welcome to call!
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 that can cause fouling in reverse osmosis membranes, such as large colloidal particles, slime, microorganisms, and organic matter. This includes the backwash disinfection dosing system, ultrafiltration units, and backwash pumps, among others. Ultrafiltration (abbreviated as UF) is a physical separation process that uses pressure to drive the separation of liquids based on the different pore sizes of the ultrafiltration membrane. Ultrafiltration membranes are typically asymmetric in structure, consisting of a very thin (usually less than 1μm) skin layer with a specific pore size and a thicker (usually 125μm) porous layer with a spongy or finger-like structure. The former serves the separation function, while the latter supports it. The typical pore size of ultrafiltration membranes is between 0.01 and 0.1 micrometers, offering a high removal rate for bacteria, most pathogens, colloids, sludge, etc. The smaller the nominal pore size of the membrane, the higher the removal rate. The materials used for ultrafiltration membranes are usually high polymers. For ultrafiltration, the widely used descriptive term for analyzing the separation mechanism is the "screening" theory. The ideal ultrafiltration membrane separation process involves the solvent and small solute particles from the high-pressure feed stream passing through the low-pressure side of the membrane due to the blocking of macromolecules and particles larger than the membrane pore size, resulting in the gradual concentration of the feed stream; larger molecules, colloids, proteins, particles, etc., 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 significant characteristics in their pore structure, as well as chemical properties on 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 very important for industrial applications.
Membrane component structures include plate, rolled, tubular, and hollow fiber types, divided into three categories based on the position 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, having a capillary-like structure and being spun from filaments. The inner or outer surface is a dense layer, also known as the active layer, with a porous support structure inside. The dense layer is densely packed with micropores, and the separation purpose is achieved by whether the solution components can pass through these micropores. The feed solution flows through the hollow fiber membrane's inner or outer holes under pressure, while the filtered liquid exits from the other side.
2. Reverse Osmosis (RO) System
Reverse osmosis (RO) membranes, also known as anti-permeation membranes, are a high-tech membrane separation technology invented by Loeb and Sourirtajan from the University of California, Los Angeles in 1960. Their pore size is 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 the RO membrane, thereby strictly separating pure water that can pass through from concentrated water that cannot.
Principle: Osmosis is a physical phenomenon where, when two bodies of water with different salt concentrations are separated by a semi-permeable membrane, the water on the side with lower salt content will渗透 through the membrane until the concentrations are equalized. However, this process takes a considerable amount of time and is known as natural osmosis. If a pressure is applied to the side with higher salt content, it can stop the osmosis, and this pressure is called osmotic pressure. Increasing the pressure can cause the water to permeate in the opposite direction, leaving the salt behind. Therefore, the principle of reverse osmosis desalination involves applying a pressure greater than the natural osmotic pressure to saltwater (such as raw water), causing the water molecules to be pushed to the other side of the membrane, resulting in clean water. This process removes salt from the water, thereby achieving desalination.
The reverse osmosis membrane utilizes an aromatic polyamide spiral wound composite membrane. The reverse osmosis system consists of composite membrane elements, high-pressure pumps, fiberglass pressure vessels, chemical cleaning equipment, brackets, and an instrument control cabinet. Equipped with a local control panel, which houses various local instruments and control buttons. The reverse osmosis desalination unit is controlled by a PLC for automatic operation. It is also fitted 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 and adjusting the pH to around alkaline (8.2), carbon dioxide can be converted to bicarbonate ions, which are then removed by the secondary RO membrane, ensuring the secondary RO permeate meets specifications.
The pH adjustment system is fully automated, equipped with a metering pump that automatically injects diluted NaOH solution into the pipeline. The metering is accurate, the overall design is lightweight, with precise speed control, and it is not affected by heat sources or electromagnetic interference. Through real-time monitoring by the online pH monitoring instrument, chemicals are automatically added to ensure the stable water quality of the secondary RO production.
4. EDI Deionization System
EDI equipment, Continuous Electrodeionization (EDI), utilizes mixed ion exchange resins to adsorb the cations and anions in the feedwater. Simultaneously, these adsorbed ions are removed by passing through the cation and anion exchange membranes under the influence of direct current voltage. The ion exchange resins are electro-continuously regenerated, thus 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. The anion exchange membrane only permits anions to pass, while the cation exchange membrane only permits cations. 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 called the freshwater chamber. Arranging a certain number of EDI units in series, alternating the cation and anion exchange membranes, and adding special ion exchange resins between the membranes creates a concentrate water 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 electrodes, passing through the cation and anion exchange membranes into the concentrate water chamber. At the same time, the ions in the feedwater are adsorbed by the ion exchange resin, occupying the voids left by the ion electro-migration. In fact, the migration and adsorption of ions occur simultaneously and continuously. Through this process, the ions in the feedwater pass through the ion exchange membranes into the concentrate water chamber and are removed to become 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 concentrate water chamber. Subsequently, these ions encounter the nearby cation exchange membrane during their migration towards the positive pole, which does not allow anions to pass, thus trapping these ions in the concentrate. Positively charged cations (e.g., Na+, H+) in the freshwater are similarly trapped in the concentrate water chamber. In the concentrate water 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. There is a high voltage gradient in the EDI component, which causes the water to electrolyze, producing 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 being 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.
Key Features of EDI
1. No need for acid/base regeneration, no acid/base storage or dilution transportation facilities required; safe and reliable, avoiding worker exposure to acids and bases.
2. Saved on recycled water and wastewater treatment facilities
3. Reduced operational and maintenance costs
4. Compact footprint, easy installation, and high water yield (up to 90-95%)
5. Continuous operation, stable product water quality, no downtime 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 resins of nuclear grade, with ion forms being H and OH. As a terminal desalination unit, it can elevate the resistivity of the feedwater from the previous stage to the user's required level and also has certain control capabilities over TOC and SiO2.
Polished mixed床 ion exchange requires specific feedwater, which must be the product water from the cation, anion, or mixed bed ion exchange systems, or from an EDI continuous electrical deionization system. Only when the feedwater meets its 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 leads to a disruption in the synthesis of proteins and enzymes within the bacteria, causing microbial mutation or death. According to tests, UV light with a wavelength of 200-250nm has sterilization capabilities, with the most effective sterilization at 253.7nm. UV light at 185nm is particularly effective for TOC removal. The equipment requires the use of lamps as consumables, which need to be replaced regularly, with a lifespan of ≥9000 hours.
Section 3: National Standard for Electronic Grade Ultra-Pure Water (GB/T11446.1-2013)
Section 4: Selected Classic Customer Cases:
V. National Warranty and Service System:
1. A professional installation and after-sales team provides 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 system, conduct performance evaluations, set up a customer service department, a complaint hotline, and promptly address customer needs.
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 operation costs.
5. Multiple channels for after-sales feedback, providing nationwide after-sales maintenance services, quick response, fast processing, 24/7 service.
6. Strictly Commitment: Two-year free warranty on the entire unit, lifetime free technical support.
For more product information, 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!
※ Phone consultation available with 10% discount, welcome to call!
