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 |
- Traditional process: composed of mechanical filters, activated
carbon filters, and security filters.
- Latest process: composed of mechanical filters, security filters,
and ultrafiltration (UF).
- Composed of high-pressure pumps and RO membranes.
- Can be divided into primary RO and secondary RO.
- Composed of ion exchange and microfiltration filters.
- Composed of EDI and microfiltration filters.
- 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. - 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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