Primary Application of Ultra-Pure Water Equipment:
1. Semiconductor Industry: Used for wafer cutting (6-12 inches), cleaning, regeneration, sealing and testing water, semiconductor equipment cleaning, and electronic-grade cleanroom cloth and gown 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 production 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-ion separators), lead-acid batteries, and 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 materials production.
7. Non-ferrous metals, precious metal smelting process water, aviation new material production water, capacitor material corrosion and formation process water, vacuum coating, high-purity ink, etc.
Design Reference Standards for Ultra-Pure Water Equipment:
Electrical Industry Pure Water System Design Specification 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/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 particulate matter in electronic-grade water - GB/T 11446.9-2013
Method for culturing and testing total bacterial count on filter membranes for electronic grade water — GB/T 11446.10-2013
※MidPure Eco-Friendly Brand 『Design Advantages』:
1. One-on-one professional service, free on-site site survey, considering placement area and access space, free original water quality testing.
2. Understand the customer's full-day water demand, peak water usage, water quality requirements, and their production process and industry characteristics.
3. Professional team collaboration with design, coupled with on-site inspections by one-on-one service personnel, and a one-stop water treatment solution service.
4. Intelligent design with precise control and high degree of automation. Each unit can perform automatic forward/reverse wash and operation, with interlock protection and alarm indication. Features 4-20mA data openness, allowing for remote transmission to the DCS control system, truly achieving unattended operation.
5. Segmented testing 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. Emphasis is placed on process control.
6. Design products tailored to customers based on a balanced consideration of comprehensive investment and operational costs.
※Purely Eco-Friendly Brand 『Production Advantages』：
1. Core components are all imported, and we have established long-term cooperative relationships with many international brands such as America's DOW, Hydrotreatment, GE, Siemens, Rhone-Poulenc, Denmark's Grundfos, Rosemount, Japan's Siamix, and Schneider, ensuring reliable quality assurance for our products.
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, and final product quality checks.
4. Production staff produce according to assigned numbers, organized in shifts for efficient production. Responsibility-based division of labor, with a strong performance evaluation and traceability system in place.
5. Pre-delivery trial operation inspection of the complete unit, electrical point operation test, to ensure delivery of qualified products to the customer.
※Pure Environmental Protection Brand 『After-Sales Advantage』：
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 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 for reducing equipment operation costs.
5. Multiple channels for after-sales feedback, offering nationwide after-sales maintenance services, quick response, rapid processing, 24/7 service.
6. We solemnly promise: two-year free warranty for the entire machine, lifetime free technical support.
I. Recommended Process for Ultra-Pure Water Production:
1. Grade 1 RO+EDI+Blending: Water production resistivity ≥ 18 MΩ·cm (25°C), all other specifications meet the electronic grade ultra-pure water standard.
Raw Water → Raw 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 Desalination Unit → Ultra-Pure Water Tank (Recommended Nitrogen Protection) → Transfer Pump → Polishing Mixed Bed → UV/TOC → Fine Filter → Water Usage Point → Return Water (Recommended 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 Delivery: Product water resistivity ≥ 18 MΩ·cm (25℃), other specifications meet the standard for electronic grade ultra-pure water.
Raw Water → Raw 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) → Transfer Pump → Polishing Mixed Bed → UV/TOC → Fine Filter → Water Use Point → Return Water (recommended with pipe circulation, no dead water)
Note: If the particle and TOC requirements are high, it is recommended to set a dedicated ultrafiltration (UF) membrane (Asahi Kasei from Japan) for particle removal and TOC indicators in the later stage.
3. Disk filter + UF + Secondary RO + EDI + mixed-bed: Product water resistivity ≥ 18 MΩ·cm (25℃), all other specifications comply with electronic grade ultra-pure water standards.
Source Water → Source Water Tank → Boost Pump → Disk 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 → Boost Pump → Fine Filter → EDI Deionization 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:
1. If there are high requirements 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 downstream process.
2. The above process is the full-membrane process
3. Grade 1 RO + Grade 3 mixed: Water production resistivity ≥ 18 MΩ·cm (25℃), the rest of the indicators meet the specifications for electronic grade ultra-pure water.
Source Water → Activated Carbon Filter Core → 10um Filter Core → 5um Filter Core → 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 (Recommended Nitrogen Protection) → Feed Pump → UV/TOC → Fine Filter → Water Usage Point → Return Water (Recommended Pipeline Recirculation, 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 at 18550863818 or the national hotline at 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
Ultrafiltration (UF) System
The primary function of the ultrafiltration system is to separate impurities such as suspended large molecules, colloids, slime, microorganisms, and organic matter that can cause fouling in reverse osmosis membranes. This includes the backwash disinfection system, ultrafiltration units, and backwash pumps, etc. Ultrafiltration (abbreviated as UF) is a physical screening process that uses pressure as the driving force to separate liquids based on the different pore sizes of ultrafiltration membranes. Ultrafiltration membranes are typically asymmetric in structure, consisting of a very thin (usually less than 1μm) skin layer with a certain size of pore diameter 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 ranges from 0.01 to 0.1 micrometers, offering an extremely high removal rate for bacteria, most pathogens, colloids, sludge, etc. The smaller the nominal pore size of the membrane, the higher the removal rate. Ultrafiltration membranes commonly use high molecular polymer materials. For ultrafiltration, the widely used descriptive analysis of the separation mechanism is the "screening" theory. The ideal ultrafiltration membrane separation process is that under pressure, the solvent and small solute particles in the feedstock liquid pass through the low-pressure side of the membrane from the high-pressure side, as the macromolecules and particles larger than the membrane pore size are blocked by the membrane, the feedstock liquid gradually becomes concentrated; the large molecules, colloids, proteins, particles, etc., 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 it is not simple to analyze the ultrafiltration phenomenon. Ultrafiltration membranes have an important characteristic of pore structure, as well as chemical properties on the membrane surface. The 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.
The membrane component structure includes plate, rolled, tubular, and hollow fiber types, and is 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, spun from fibers. The inner or outer surface is a dense layer, also known as the active layer, with a porous support inside. 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 solution flows at high pressure within the hollow fiber membrane's pores or on the outside, while the filtered liquid exits from the opposite side.
2. Reverse Osmosis (RO) System
Reverse osmosis membranes, also known as RO, 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 long time and is known as natural osmosis. But if a pressure is applied to the side with higher salt content, it can stop the osmosis, and this pressure is called osmotic pressure. If the pressure is increased further, it can cause the water to 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), causing the osmosis to occur in the opposite direction, pushing the water molecules to the other side of the membrane, resulting in clean water, and thus achieving the goal of removing salt from the water.
The reverse osmosis membrane uses an aromatic polyamide spiral wound composite membrane. The reverse osmosis unit 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 is installed with various local instruments and control buttons. The reverse osmosis desalination unit is controlled by a PLC and operates automatically. It is equipped with flowmeters, pressure gauges, conductivity meters, and more.
3. pH Adjustment System
Due to the inability of the RO membrane 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 can then be 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 to automatically inject diluted NaOH solution into the pipeline with precise measurement. The overall design is lightweight, featuring accurate speed control and immunity to heat sources and electromagnetic interference. Through real-time monitoring by a pH online monitoring instrument, the system automatically adds reagents to ensure the stable water quality of the second-stage RO product.
4. EDI Deionization System
EDI equipment, Continuous Electrical Deionization (EDI), utilizes mixed ion exchange resins to adsorb the positive and negative ions in feedwater. Simultaneously, these adsorbed ions are separated under the action of direct current voltage, passing through anion and cation exchange membranes, respectively, and are removed. The ion exchange resins are electrically continuously regenerated, thus eliminating the need for acid and alkali regeneration. This new technology can replace traditional ion exchange (DI) systems, producing ultra-pure water with a resistivity of ≥15MΩ.CM. The working principle of the ion exchange membranes is similar to that of the ion exchange resins, selectively allowing ions to pass through. An anion exchange membrane only allows anions to pass, while a cation exchange membrane only allows cations. Filling a mixture of ion exchange resins between anion and cation exchange membranes forms an EDI unit. The space between the anion and cation exchange membranes filled with mixed ion exchange resins is called the freshwater chamber. Arranging a certain number of EDI units in a row, alternating anion and cation exchange membranes, and adding special ion exchange resins between the membranes, the resulting space is known as the concentrate chamber. Under the push of the given direct current voltage, in the freshwater chamber, the anions and cations in the ion exchange resins migrate towards the positive and negative poles, respectively, passing through the anion and cation exchange membranes into the concentrate chamber. At the same time, the ions in the feedwater are adsorbed by the ion exchange resins, occupying the space left due to the ion electrical 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 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 chamber. Later, these ions encounter the nearby cation exchange membrane during their migration towards the positive pole, which does not allow anions to pass, so these ions are blocked in the concentrate. Positively charged cations (e.g., Na+, H+) in the freshwater are blocked in the concentrate chamber in a similar manner. In the concentrate chamber, the ions passing through the anion and cation membranes maintain electrical neutrality. The electrical current and ion migration in the EDI components 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 itself. In the EDI components, there is a high voltage gradient, under which water is electrolyzed to 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 components can be divided into two parts: working resin and 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.
Features of EDI
1. No need for acid/base regeneration, no acid/base storage or dilution transportation facilities required; safe and reliable to use, avoiding worker exposure to acids and bases
2. Saves on reclaimed water and treatment facilities for reclaimed wastewater.
3. Reduced operating and maintenance costs
4. Small 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
Polishing mixed beds are 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-regenerable polishing mixed bed resin, which is in H and OH ionic forms. As a terminal desalination device, it can raise 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 bed ion exchange requires specific feedwater, which must be the product water from an anion, cation, or mixed bed ion exchange system, or from a continuous EDI (Electrodeionization) salt removal system. Only under feedwater conditions that meet 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 leads to obstacles in the synthesis of proteins and enzymes within the bacteria, causing microbial mutation or death. According to tests, ultraviolet 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 uses lamps as consumables, which need to be replaced regularly, 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:
V. National Warranty and Service System:
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 for reducing equipment operating costs.
5. Multiple channels for after-sales feedback, nationwide after-sales maintenance services, quick response, fast processing, 24/7 service.
6. Strictly 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!
※ Phone consultation, enjoy 10% off! Welcome to call!
