Double-pass Reverse Osmosis , EDI, Polishing Resins
Operation Mode:
Fully Automated With PLC Control
Material:
Stainless Steel 304/316
Packaging Details:
export standard wooden case
Highlight:
Biochemical Ultra Pure Water Machine
,
RO EDI Systems For Silicon Wafers
Product Description
Equipment Principles
Ultrapure water equipment uses pretreatment, reverse osmosis technology, mixed beds, EDI devices, and post-treatment methods to remove almost all conductive media from water, as well as reduce colloidal substances, gases, and organic matter that do not dissociate in water to extremely low levels. It is also known as ultrapure water purifiers, ultrapure water machines, ultrapure water instruments, ultrapure water systems, laboratory ultrapure water purifiers, etc. The resistivity of ultrapure water produced by ultrapure water machines should generally exceed 10 MΩ·cm, and water above 10 MΩ·cm is called ultrapure water, with typical output reaching 18.25 MΩ·cm.
Reverse osmosis (RO) membrane technology
The equipment primarily adopts reverse osmosis (RO) membrane technology. Its working principle is to apply pressure to water, allowing water molecules and ionic mineral elements to pass through the RO membrane, while most dissolved inorganic salts (including heavy metals), organic matter, bacteria, viruses, etc., cannot penetrate the membrane. This strictly separates the purified water that permeates through from the concentrated water that does not. The RO membrane has pores as small as 0.0001 microns, while viruses typically have a diameter of 0.02–0.4 microns and common bacteria have a diameter of 0.4–1 micron.
EDI technology is a revolutionary water treatment technology that integrally combines electrodialysis with ion exchange for continuous demineralization, belonging to high-tech green environmental protection technology. EDI water purification equipment features continuous water output, no need for acid-alkali regeneration, and unattended operation, gradually replacing mixed beds as polishing treatment equipment in pure water systems.
EDI devices, applied after RO systems, replace ion exchange resins without acid-alkali regeneration, featuring stable water quality, low operation costs, convenient operation and management, and small floor space.
Parameter:
Item
EDI
Mixed Bed
Product Water Quality
15 - 18 MΩ·cm
2 - 10 MΩ·cm
Stability
Stable water quality
Water quality is greatly affected by resin exchange status and regeneration quality
Operability
Simple operation, no need for professionally skilled workers
High requirement for operators' operation level during regeneration
Environmental Friendliness
No acids or alkalis needed, no chemical pollution at all
Acids and alkalis needed for regeneration, need to solve storage and discharge issues of acids and alkalis
Continuous Operation
No shutdown required during regeneration, regeneration while operating
Shutdown required for regeneration
Operation Cost
Low
High
Initial Investment
Relatively high
Low
Process Introduction
① Pretreatment
Traditional process: composed of mechanical filters, activated carbon filters, and security filters.
Latest process: composed of mechanical filters, security filters, and ultrafiltration (UF).
② Reverse Osmosis System
Composed of high-pressure pumps and RO membranes.
Can be divided into primary RO and secondary RO.
③ Polishing Treatment System
Composed of ion exchange and microfiltration filters.
Composed of EDI and microfiltration filters.
Process Flow
Pretreatment System → RO System → Intermediate Water Tank → Coarse Mixed Bed → Fine Mixed Bed → Pure Water Tank → Pure Water Pump → UV Sterilizer → Polishing Mixed Bed → Precision Filter → Water Usage Object (≥18 MΩ·cm) (traditional process)
Pretreatment → RO → Intermediate Water Tank → Water Pump → EDI Device → Purified Water Tank → Pure Water Pump → UV Sterilizer → Polishing Mixed Bed → 0.2 or 0.5μm Precision Filter → Water Usage Object (≥18 MΩ·cm) (latest process)
Pretreatment → Primary RO → Dosing Machine (pH Adjustment) → Intermediate Water Tank → Secondary RO (Positive Charge RO Membrane) → Pure Water Tank → Pure Water Pump → EDI Device → UV Sterilizer → 0.2 or 0.5μm Precision Filter → Water Usage Object (≥17 MΩ·cm) (latest process)
Pretreatment → RO → Intermediate Water Tank → Water Pump → EDI Device → Pure Water Tank → Pure Water Pump → UV Sterilizer → 0.2 or 0.5μm Precision Filter → Water Usage Object (≥15 MΩ·cm) (latest process)
Pretreatment System → RO System → Intermediate Water Tank → Pure Water Pump → Coarse Mixed Bed → Fine Mixed Bed → UV Sterilizer → Precision Filter → Water Usage Object (≥15 MΩ·cm) (traditional process)
Each of the above processes has its advantages, and you can select a suitable process based on your specific needs. With scientific development, many new processes have replaced old ones, and RO technology for producing high-purity water has become popular and is the most current process.
Equipment Features
Large water permeability and high desalination rate, normally ≥98%.
High interception and removal effect on organic matter, colloids, particles, bacteria, viruses, heat sources, etc.
Low energy consumption, high water utilization rate, and lower operation costs than other desalination equipment.
The separation process has no phase change, with reliable stability.
Small equipment volume, simple operation, easy maintenance, strong adaptability, and long service life.
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