The difference between ultrapure water equipment and pure water equipment

Ultrapure water equipment uses pretreatment, reverse osmosis technology, ultrapurification, and post-treatment methods to almost completely remove conductive media from water, and also remove undissolved colloidal substances, gases, and organic matter in water to a very low level. This is a water treatment equipment.

Pure water equipment mainly uses reverse osmosis membrane technology. Its working principle is to apply a certain pressure to the water, allowing water molecules and ionically mineral elements to pass through the reverse osmosis membrane, while most inorganic salts dissolved in the water (including heavy metals ) 、organic matter, bacteria, and viruses cannot pass through the reverse osmosis membrane, thus strictly separating the permeated pure water from the unpermeated concentrated water. ; The pore size of the reverse osmosis membrane is only 0.0001 micrometers , while the diameter of viruses is generally 0.02-0.4 micrometers , The diameter of ordinary bacteria is 0.4-1 micrometers.

I. Different Uses

(1) Uses of ultrapure water equipment:

1 Production and cleaning of ultrapure materials and ultrapure reagents.

2 Production and cleaning of electronic products.

3 Production of battery products.

4 Production and cleaning of semiconductor products.

5 Production and cleaning of circuit boards.

6 Production of other high-tech precision products.

(2) Uses of pure water equipment:

1 Power plant chemical water treatment

2 Electronics, semiconductors, ultrapure water in the precision machinery industry

3 Preparation of food, beverages, and drinking water

4 Small pure water stations, group drinking water

5 Fine chemicals, water for cutting-edge disciplines

6 Preparation of high-purity water required by other industries

7 Process water for the pharmaceutical industry

8 Desalination of seawater and brackish water

II. Different Water Conductivity

1. Ultrapure water output water quality: resistivity >15MΩ.cm

Ultrapure water quality is divided into five industry standards: 18MΩ.cm, 15MΩ.cm 、 10MΩ.cm 、 2MΩ.cm 、 0.5MΩ.cm to distinguish different water qualities.

2. Pure water is divided into : industrial pure water and drinking pure water industrial pure water : at 25 degrees Celsius, 1 Ordinary pure water :EC=1~10us/cm;2 High-purity water :EC=0.1~1.0us/cm;3 Ultrapure water :EC=0.1~0.055 ; Drinking pure water :EC=1~10 us/cm( National Standard )。

III. Different Process Flows Used Between Different Equipment

(1) The process flow of ultrapure water equipment is:

1 Pretreatment system → Reverse osmosis system → Intermediate water tank → Coarse mixed bed → Fine mixed bed → Pure water tank → Pure water pump → Ultraviolet sterilizer → Polishing mixed bed → Precision filter → Water user ( ≥18MΩ.CM ) ( Traditional process )。

2 Pretreatment → Reverse osmosis → Intermediate water tank → Water pump →EDI Device → Purified water tank → Pure water pump → Ultraviolet sterilizer → Polishing mixed bed →0.2 or 0.5μm Precision filter → Water user ( ≥18MΩ.CM ) ( Latest technology )。

3 Pretreatment → First-stage reverse osmosis → Chemical dosing unit ( PH adjustment) → Intermediate water tank → Second-stage reverse osmosis (positive charge reverse osmosis membrane) → Pure water tank → Pure water pump →EDI Device → Ultraviolet sterilizer →0.2 or 0.5μm Precision filter → Water user ( ≥17MΩ.CM ) ( Latest technology )。

4 Pretreatment → Reverse osmosis → Intermediate water tank → Water pump →EDI Device → Pure water tank → Pure water pump → Ultraviolet sterilizer →0.2 or 0.5μm Precision filter → Water user ( ≥15MΩ.CM ) ( Latest technology )。

5 Pretreatment system → Reverse osmosis system → Intermediate water tank → Pure water pump → Coarse mixed bed → Fine mixed bed → Ultraviolet sterilizer → Precision filter → Water user ( ≥15MΩ.CM ) ( Traditional process )。

(2) The process flow of the pure water equipment is:

1 Using ion exchange method

Raw water →Raw water pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → Cation resin filter bed → Anion resin filter bed → Mixed bed of cation and anion resins → Microporous filter → Water point

2 Using two-stage reverse osmosis method

Raw water →Raw water pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First stage reverse osmosis →PH Adjustment → Intermediate water tank → Second stage reverse osmosis ( Reverse osmosis membrane surface is positively charged )→ Purified water tank → Pure water pump → Microporous filter → Water point

3 Using EDI Method

Raw water →Raw water pump → Multi-media filter → Activated carbon filter → Water softener → Precision filter → First stage reverse osmosis unit → Intermediate water tank → Intermediate water pump →EDI System → Microporous filter → Water point

China Water Treatment Industry Excellent