Water Treatment Mechanical Filter Active Carbon Filter Softener Reverse Osmosis with EDI Ultraviolet Automatic Equipment

Product description

This device is a deep purified water preparation system that uses a step-by-step process of “pretreatment → desalination → deep purification → terminal sterilization”, combined with fully automatic control technology, to treat raw water (tap water, groundwater, etc.) into ultrapure water with a resistivity of ≥ 15M Ω· cm. It is widely used in scenarios that require extremely high water quality, such as pharmaceutical injection water, electronic grade ultrapure water, and high-end laboratory water. The following provides a detailed explanation of the system composition, working principle, and core advantages:
1、 Core components and functions of the system
1. Mechanical Filter
Construction: 304/316L stainless steel tank body, equipped with gradient filter material (lower quartz sand+middle anthracite+upper garnet), fully automatic backwash valve group (PLC control) and pressure sensor.
Core functions:
Multi stage interception: Through the synergistic effect of different particle size filter media, suspended impurities such as sediment, rust, algae, colloids, etc. (particle size ≥ 10 μ m) in raw water are removed, reducing turbidity from 20-50NTU to ≤ 1NTU;
Reduce pollution risk: make the SDI of incoming water ≤ 5, providing “low pollution” incoming water for subsequent precision equipment such as activated carbon and reverse osmosis;
Automatic maintenance: When the inlet and outlet water pressure difference is greater than 0.05MPa or timed (8-12 hours), automatic backwashing (water flushing+air flushing) is started to restore the filtering ability of the filter material.
2. Active Carbon Filter
Construction: Same material tank body, filled with high iodine value coconut shell particle activated carbon (specific surface area ≥ 1200m ²/g, iodine adsorption value ≥ 1100mg/g), and operated in conjunction with a mechanical filter.
Core functions:
Targeted adsorption: Efficient adsorption of residual chlorine (removal rate>99.9%), organic matter (such as humic acid, pesticides), odors, and some heavy metals (such as mercury, lead) in water, avoiding oxidation of residual chlorine by reverse osmosis membranes and EDI resins;
Improving water quality characteristics: reducing total organic carbon (TOC) to ≤ 1mg/L, reducing organic pollution from subsequent membrane components and EDI;
Extend the lifespan of core equipment: adsorb surfactants and colloidal organic compounds in water to prevent irreversible pollution of reverse osmosis membranes.
3. Softener
Structure: stainless steel tank, containing sodium cation exchange resin (such as 001 × 7FC gel), supporting salt tank (8-10% NaCl solution) and automatic regeneration controller (flow+time double trigger).
Core functions:
Deep de hardening: removing calcium (Ca ² ⁺) and magnesium (Mg ² ⁺) ions through ion exchange, reducing water hardness from 300-800mg/L (calculated as CaCO ∝) to ≤ 0.5mg/L;
Scale prevention protection: Thoroughly eliminate hardness ions to prevent the formation of calcium carbonate and calcium sulfate scale on the surface of reverse osmosis membranes and EDI membrane stacks (scale can reduce EDI current efficiency by more than 40%);

Automatic regeneration: When the treated water reaches the resin exchange capacity (or timed for 7 days), the “backwash → salt absorption → replacement → forward washing” process is automatically completed without manual intervention.
4. Reverse Osmosis (RO) system
Core components:
Precision filter (1 μ m PP folding filter element, intercepting residual particles);
High pressure pump (316L stainless steel, providing 1.2-1.6MPa pressure, frequency conversion control);
Reverse osmosis membrane module (Dow BW30-400FR anti fouling membrane, desalination rate ≥ 99.7%, 2-3 in series);
Fully automatic valve group (adjust the recovery rate to 70-75%, and control the discharge of concentrated water).
Core functions:
Primary desalination: removing over 99% of soluble salts (TDS reduced from 1000mg/L to ≤ 30mg/L), bacteria, viruses, and large organic molecules;
Provide qualified influent (conductivity ≤ 50 μ S/cm) for EDI to reduce its desalination load.
5. EDI system (Electrodeionization)
Construction: Composed of EDI membrane stack (alternating arrangement of anion/cation exchange membranes, fresh water chamber/concentrated water chamber, positive and negative electrodes), DC power supply (adjustable 50-300V), and circulating pump.
Core functions:
Deep purification: Under the action of an electric field, residual ions in water are conducted through ion exchange resin and migrate to the concentrated water chamber, achieving “continuous desalination”, with a water production resistivity of ≥ 15M Ω· cm (conductivity ≤ 0.067 μ S/cm);
No need for chemical regeneration: The H ⁺ and OH ⁻ generated by water electrolysis continuously regenerate the resin, avoiding the acid-base consumption and pollution of traditional mixed beds;
Removing trace amounts of organic matter and colloids, TOC≤50ppb， Meet the requirements of electronic grade and pharmaceutical grade ultrapure water.
6. Ultraviolet sterilizer
Construction: 316L stainless steel chamber, built-in 254nm wavelength UV lamp (power 30-100W, configured according to flow rate), irradiation time ≥ 30 seconds, equipped with lamp operation monitoring sensor.
Core functions:
Kill potential residual microorganisms (bacteria, viruses, spores) in EDI wastewater with a sterilization rate of ≥ 99.99%;
Destroy the DNA structure of microorganisms, prevent the growth of bacteria in pure water during storage or transportation, and ensure the sterility of terminal water.
7. Fully automatic control system
Core: 10-15 inch touch screen PLC control cabinet, integrating various unit sensors (conductivity, pressure, liquid level, flow) and actuators (valves, pumps).
Function:
Real time display of full process parameters (such as RO water TDS, EDI resistivity, UV operating status), supporting historical data storage (≥ 1 year);
Automatic linkage: mechanical filter backwashing, softener regeneration, RO membrane flushing, EDI concentrated water circulation, etc;

Fault alarm (such as EDI resistivity not meeting standards, UV lamp failure) and triggering protection action (such as excessive water discharge);
Support remote control (optional 4G/Ethernet module) to achieve unmanned operation.
2、 System workflow
Pre treatment purification:
Raw water → mechanical filter (excluding suspended impurities) → activated carbon filter (excluding residual chlorine and organic matter) → softener (excluding calcium and magnesium ions), effluent turbidity ≤ 1NTU, residual chlorine ≤ 0.01mg/L, hardness ≤ 0.5mg/L.
Primary desalination:
Pre treated water → 1 μ m precision filtration → high-pressure pump pressurization → reverse osmosis membrane module, produced water TDS ≤ 30mg/L (conductivity ≤ 50 μ S/cm), concentrated water discharge.
Deep purification:
RO water production → EDI system, deep desalination under the action of electric field, water resistivity ≥ 15M Ω· cm, enters the intermediate water tank.
Terminal sterilization and water supply:
EDI water production → UV sterilizer (to kill microorganisms) → sterile water tank storage, finally transported to the terminal water point through a variable frequency water supply pump, and the water quality is monitored online throughout the process.
3、 Core advantages and application scenarios
Core advantages
Ultra pure water quality: produced water resistivity ≥ 15M Ω· cm, TOC ≤ 50ppb, microorganisms ≤ 1CFU/mL, meeting the electronic grade (GB/T 11446.1-2013) and pharmaceutical grade (Chinese Pharmacopoeia 2025 edition) ultra pure water standards;
Environmentally friendly and efficient: EDI does not require acid-base regeneration, reducing chemical consumption by 90% compared to traditional mixed beds and lowering environmental pressure;
Fully automatic operation: from pre-treatment to sterilization, the entire process is self controlled, and maintenance only requires regular replacement of filter elements and replenishment of softened salt, with low operation and maintenance costs;
Strong stability: multi-stage pretreatment+two-stage desalination (RO+EDI), with water quality fluctuations of ≤± 0.5M Ω· cm, suitable for continuous production scenarios.
Typical application scenarios
Pharmaceutical industry: injection water (compliant with USP and EP standards), sterile raw material production, medical device cleaning;
Electronics industry: semiconductor wafer cleaning, LCD panel manufacturing, electronic grade chemical reagent preparation;
High end laboratory: water for precision instruments such as ICP-MS and HPLC, and water for molecular biology experiments;
New energy industry: production of lithium battery separators, cleaning of photovoltaic silicon wafers (requiring extremely low ion content).
summarize
The system achieves one-stop preparation from raw water to ultrapure water through the full process of “mechanical filtration+activated carbon adsorption+softening and superhard+RO primary desalination+EDI deep purification+UV sterilization”. The core value lies in ultrapure water quality, environmentally friendly operation, and full process controllability. Its fully automated design and rigorous water quality control make it an ideal solution for the demand for ultrapure water in high-end manufacturing, pharmaceuticals, scientific research, and other fields.