Principle and Structure of Pure Water Equipment

I. Working Principle

The working principle of the pure water system is based on reverse osmosis technology, which pushes raw water through a reverse osmosis membrane under high pressure to separate out impurities such as ions, microorganisms, and organic matter, making the water purer. The system typically consists of three parts: the pre-treatment system, the reverse osmosis system, and the post-treatment system. The pre-treatment system is mainly used to remove suspended solids and soluble substances from the raw water, including activated carbon filters, sand filters, and water softeners. The reverse osmosis system is the core component, comprising membrane modules, high-pressure pumps, and control systems. The post-treatment system usually includes activated carbon filters and ozone sterilizers to further enhance the purity and hygienic safety of the water.

Section II: Structural Composition The structural composition of the pure water system includes:

1. Raw Water Tank: Used for storing raw water, typically requiring clean water with no impurities. 2. Pretreatment System: Comprises multiple-stage filters and activated carbon filters, designed to remove suspended particles and soluble substances from the raw water. 3. Reverse Osmosis System: Consists of reverse osmosis membranes, high-pressure pumps, and control systems, serving as the core component of the pure water system. 4. Pure Water Tank: Used for storing pure water, generally demanding high purity and free from bacterial contamination. 5. Post-treatment System: Includes activated carbon filters and ozone sterilizers, enhancing the purity and hygienic safety of the water further. 6. Control System: Used to manage the entire system's operation, encompassing pressure control, flow control, and conductivity control.

Pure water equipment, an indispensable water treatment system in modern industrial production and daily life, aims to remove impurities from water through multiple physical and chemical processes, ultimately producing high-purity water with a conductivity of less than 10μS/cm. Such equipment is widely used in industries such as pharmaceuticals, electronics, chemicals, and food and beverage, with its working principle and structural design directly determining the quality of the output water and operational efficiency.
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The core working principle of pure water equipment can be summarized as "stepwise filtration, progressive purification." A typical system includes four major modules: pretreatment, reverse osmosis (RO), ion exchange, and terminal refined treatment. The pretreatment stage uses a quartz sand filter to retain suspended particles, activated carbon to adsorb residual chlorine and organics, and a precision filter to capture particles larger than 5 micrometers, providing a protective barrier for the subsequent RO membrane.
The reverse osmosis unit is the core process of desalination, utilizing a high-pressure pump to boost water pressure to 6-20 bar, forcing water molecules through a semi-permeable membrane, while over 98% of dissolved salts, colloids, and microorganisms are retained.
For higher purity requirements, the mixed bed ion exchange unit further removes residual ions through the synergistic action of cation resin (H⁺ exchange) and anion resin (OH⁻ exchange). A medical water project test shows that after polishing treatment with the mixed bed, the water quality can reach the ultra-pure standard of 18.2MΩ·cm. The terminal ultraviolet sterilizer and 0.22μm microfilter membrane ensure that microbial indicators meet pharmacopoeial requirements.

Pure water systems are essential equipment for producing high-purity water, operating on the principle of reverse osmosis technology. Through the collaboration of the pre-treatment system, reverse osmosis system, and post-treatment system, impurities such as ions, microorganisms, and organic substances in raw water are separated, providing a pure water source. Its main structural components include the raw water tank, pre-treatment system, reverse osmosis system, pure water tank, post-treatment system, and control system.