Huanggang 3-ton Two-Stage Reverse Osmosis + EDI Pure Water Equipment

In fields with extremely stringent water quality requirements, such as medical, pharmaceutical, and scientific research, high-purity water is a critical factor in ensuring product quality and experimental accuracy. The Huanggang 3-ton Two-Stage Reverse Osmosis + EDI Pure Water System, with its advanced technological integration and scientific system design, provides a stable and reliable solution for medium-scale water demand. This system combines core processes including pretreatment, two-stage reverse osmosis, and EDI (Electrodeionization), strictly adhering to authoritative domestic and international standards such as the Chinese Pharmacopoeia, United States Pharmacopeia (USP), and European Pharmacopoeia (EP), achieving efficient conversion from raw water to high-purity water. The following sections provide a detailed introduction from multiple dimensions, including system overview, working principles, core advantages, and technical parameters. 1. System Overview: Efficiently Integrated Water Treatment Solution (1) Water Production Capacity and Application Positioning The Huanggang 3-ton Two-Stage Reverse Osmosis + EDI Pure Water System can stably produce 3 tons of pure water per hour, meeting the daily water needs of medium-scale medical institutions, such as small pharmaceutical plants for active pharmaceutical ingredient production and formulation preparation, primary hospitals for medical device cleaning and dialysate preparation, and research laboratories for reagent preparation and instrument analysis. Its production scale ensures water supply continuity while balancing equipment footprint and investment costs, offering high cost-effectiveness and providing an economical and practical water treatment option for enterprises and institutions. (2) System Composition Architecture The system primarily consists of four core components: the pretreatment system, two-stage reverse osmosis system, EDI system, and intelligent control system. Each system has clear responsibilities and works collaboratively to form a complete pure water preparation system. Pretreatment System: Serving as the first line of defense for raw water purification, it includes multi-media filters, activated carbon filters, softeners (optional), and precision filters. Its main functions are to remove impurities such as suspended solids, sediment, rust, residual chlorine, organic matter, and hardness substances from raw water, reduce the raw water's contamination index, provide high-quality feed water for subsequent reverse osmosis and EDI treatment, and protect core membrane elements and equipment to extend their service life. Two-Stage Reverse Osmosis System: Comprising primary and secondary reverse osmosis, this is the key process for deep desalination. Through continuous filtration by two stages of reverse osmosis membranes, it effectively removes over 99% of dissolved salts, colloids, microorganisms, organic matter, and other impurities, significantly improving water quality and providing high-quality feed water for the EDI system. EDI System: Utilizing electrodeionization technology, under the action of a direct current electric field, it achieves directional migration of ions in water and continuous regeneration of resin, further deeply desalinating to produce ultrapure water with a resistivity of up to 18.2 MΩ·cm or higher, meeting the stringent water quality requirements of the medical and pharmaceutical industries. Intelligent Control System: Centered on a PLC programmable logic controller, paired with a touchscreen operation interface and remote monitoring module, it enables real-time monitoring, automatic adjustment, and fault alarm for equipment operating parameters, ensuring stable operation and intelligent management. 2. Working Principles: Multi-Stage Purification for Water Quality Improvement (1) Pretreatment Stage: Initial Purification of Raw Water Multi-Media Filter: Internally designed with a layered filling structure, the upper layer is filled with 0.5-1.2mm quartz sand, and the lower layer with 1-2mm anthracite. As raw water flows downward through the filter layer, quartz sand traps fine particles with its small gaps, while anthracite removes larger particulate impurities. Through physical interception, sedimentation, and adsorption, it effectively removes large particulate impurities such as suspended solids, sediment, and rust with particle sizes of 5-10μm, significantly reducing raw water turbidity. The filter is typically equipped with a backwash device; when the inlet-outlet pressure difference reaches a set value (e.g., 0.05-0.1MPa) or operating time reaches a set cycle (e.g., 48-72 hours), an air-water combined backwash procedure is initiated, starting with air scrubbing to loosen the filter media, followed by water flushing to discharge impurities and restore filtration performance. Activated Carbon Filter: High-quality coconut shell activated carbon with an iodine value of 1000mg/g is selected as the filtering medium. Its developed microporous structure and large specific surface area (up to 1000-1500m²/g) provide strong adsorption capacity. On one hand, through catalytic reduction, activated carbon converts strongly oxidizing residual chlorine in raw water into harmless chloride ions, preventing oxidative damage to subsequent reverse osmosis membranes; on the other hand, it efficiently adsorbs organic matter, pigments, odorous substances, and some heavy metal ions in water, reducing total organic carbon (TOC) content and improving water taste and quality. The activated carbon filter also has a regular backwash procedure, and the activated carbon is replaced every 6-12 months based on adsorption saturation. Softener (Optional): When raw water hardness is high (generally measured by calcium and magnesium ion concentration; if >100ppm), a softener is required. The softener is filled with strong acid cation exchange resin, which, through ion exchange reaction, replaces calcium and magnesium ions in water with sodium ions from the resin, effectively reducing water hardness and preventing scale formation on reverse osmosis membranes, ensuring stable operation and efficient desalination performance of the reverse osmosis system. The resin regeneration cycle is typically 1-2 days, with regeneration performed using a sodium chloride solution for reverse flushing to restore exchange capacity. Precision Filter: Equipped with 5μm pore size polypropylene (PP) melt-blown filter cartridges, it intercepts fine particulate impurities remaining from the pretreatment process, such as broken filter media and flocs, serving as the final protective barrier for the reverse osmosis system, preventing particulate matter from scratching the reverse osmosis membrane surface and ensuring efficient operation under good conditions. Filter cartridges are replaced every 3-6 months based on feed water quality and operating time, with a pressure difference alarm device; when the inlet-outlet pressure difference exceeds 0.07MPa, it prompts cartridge replacement. (2) Two-Stage Reverse Osmosis Stage: Core Process for Deep Desalination Primary Reverse Osmosis System: Pretreated raw water enters the primary reverse osmosis membrane unit under 1.0-1.5MPa pressure provided by a high-pressure pump. The reverse osmosis membrane, made of polyamide composite material, utilizes the selective permeability of the semi-permeable membrane, allowing only water molecules to pass while retaining dissolved salts, colloids, microorganisms, organic matter, and other impurities. The desalination rate of the primary reverse osmosis membrane is typically 98%, effectively removing most impurities and reducing product water conductivity to 10-50μS/cm. To prevent pollutant accumulation on the membrane surface from affecting filtration performance, the system is equipped with a chemical cleaning device, regularly cleaned with agents such as citric acid and sodium hydroxide. The cleaning cycle is determined based on feed water quality and operating data, generally every 3-6 months. Secondary Reverse Osmosis System: The primary reverse osmosis product water serves as feed for the secondary reverse osmosis system, undergoing further deep desalination and purification through reverse osmosis membranes under high-pressure pump action. Secondary reverse osmosis further removes trace salts and impurities remaining in the primary product water, further improving water quality, with product water conductivity reduced to 1-5μS/cm, providing high-quality feed water for subsequent EDI treatment. The design and operating parameters of the secondary reverse osmosis membrane are coordinated with the primary reverse osmosis, optimizing membrane element arrangement and operating pressure to ensure efficient and stable operation of the overall system. (3) EDI Stage: Advanced Technology for Continuous Deep Desalination The EDI system is a key link in ultrapure water preparation, its working principle based on the synergistic effect of electrodialysis and ion exchange resin. Under the action of a direct current electric field, in the dilute compartment of the EDI module, ion exchange resin adsorbs anions and cations from the secondary reverse osmosis product water, while the selective permeability of ion exchange membranes enables directional migration of ions from the dilute compartment to the concentrate compartment, achieving deep desalination. This process does not require acid-base chemical regeneration; continuous regeneration of the resin is achieved through hydrogen ions (H⁺) and hydroxide ions (OH⁻) generated by water electrolysis, not only reducing operating costs and environmental pollution but also stably producing ultrapure water with a resistivity of 18.2 MΩ·cm. The EDI module is equipped with high-precision online resistivity monitoring instruments to ensure stable and compliant water quality. 3. Core Advantages of the System: Excellent Performance Meets Stringent Requirements (1) Top-Tier Water Quality Standards The pure water produced by the system reaches industry-leading quality levels, with resistivity up to 18.2 MΩ·cm or higher, fully complying with the water for injection standards specified in the Chinese Pharmacopoeia, and meeting international authoritative standards such as the United States Pharmacopeia (USP) and European Pharmacopoeia (EP). Its low conductivity, near-zero microbial content, and pyrogen-free characteristics make it widely applicable in medical, pharmaceutical, and research fields with extremely high water quality requirements, such as injection preparation, high-end medical device cleaning, and gene sequencing experiments, providing solid assurance for product quality and experimental accuracy. (2) Stable and Reliable Operation Automated Control System: Utilizing an advanced intelligent control system with PLC + touchscreen + remote monitoring, it enables real-time monitoring of source water quality (turbidity, residual chlorine, hardness, etc.), product water quality (conductivity, resistivity, TOC, etc.), and equipment operating parameters (pressure, flow rate, temperature, etc.). When parameters become abnormal, the system automatically triggers an alarm mechanism and takes corresponding protective measures, such as shutdown or switching to backup equipment, while storing fault information for quick troubleshooting by maintenance personnel. Additionally, operators can monitor equipment status, adjust parameters, and handle faults anytime and anywhere via the remote monitoring system, greatly enhancing the convenience and efficiency of equipment management. Modular Design and Convenient Maintenance: The system adopts a modular design concept, with each treatment unit independent yet closely coordinated, facilitating installation, debugging, and maintenance. The filters in the pretreatment system feature quick-connect structures, allowing filter cartridge replacement without complex tools or prolonged downtime, simply by disassembly; the cleaning and maintenance procedures for the two-stage reverse osmosis membranes and EDI module are standardized, enabling enterprises to perform regular chemical cleaning and maintenance based on equipment operation, effectively extending equipment service life and reducing failure rates. (3) Energy-Saving and Environmentally Friendly Design Energy Saving and Consumption Reduction: Energy-saving technologies and equipment are fully utilized in system design and operation. High-pressure pumps are equipped with frequency converters, automatically adjusting speed based on actual water production demand, reducing energy consumption by 10%-30% compared to traditional fixed-frequency pumps; simultaneously, energy-efficient pumps, motors, and other equipment are used, with optimized system pipeline design to reduce water flow resistance, further lowering overall energy consumption. Additionally, the EDI system eliminates the need for acid-base regeneration, avoiding energy consumption during regeneration and reducing operating energy consumption of related equipment. Environmental Protection and Emission Reduction: The application of EDI technology avoids the use of large amounts of acid-base chemicals in traditional ion exchange resin regeneration processes, reducing chemical wastewater discharge, lowering wastewater treatment costs, and minimizing environmental pollution. Backwash wastewater generated by the pretreatment system, after simple treatment, can be used for green irrigation, road flushing, etc., improving water resource utilization, achieving water recycling, and complying with national policies on energy conservation, emission reduction, and green development.