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Ultra pure water systems in other industries

Ultra pure water systems in other industries

Ultra pure water is widely used in solar photovoltaics, optical photovoltaics, new energy and new materials LED、PCB、 Industries such as sapphire.

Technical specifications for national electronic grade ultrapure water

Project

Specification

EW-I

EW-Ⅱ

EW-Ⅲ

EW-IV

Resistivity(25℃)/MQ ·cm

≥18

(5% of the time not less than 17)

≥15

(5% of the time not less than 13)

≥12.0

≥0.5

All silicon/(μg/L)

≤2

≤10

≤50

≤1000

Particle count/(pcs/L)

0.05μm~0.1μm

500

-

-

-

0.1μm~0.2μm

300

-

-

-

0.2μm~0.3μm

50

-

-

-

0.3μm~0.5μm

20

-

-

-

>0.5μm

4

-

-

-

Number of bacteria/(pcs/mL)

≤0.01

≤0.1

≤10

≤100

Copper/(μ g/L)

≤0.2

≤1

≤2

≤500

Zinc/(μg/L)

≤0.2

≤1

≤5

≤500

Nickel/(μg/L)

≤0.1

≤1

≤2

≤500

Sodium/(μ g/L)

≤0.5

≤2

≤5

≤1000

Potassium/(μ g/L)

≤0.5

≤2

≤5

≤500

Iron/(μ g/L)

≤0.1

-

-

-

Lead/(μ g/L)

≤0.1

-

-

-

Fluorine/(μ g/L)

≤1

-

 

 

Chlorine/(μ g/L)

≤1

≤1

≤10

≤1000

Nitrite/(μ g/L)

≤1

-

-

-

Bromine/(μ g/L)

≤1

-

-

-

Nitrate radical/(μ g/L)

≤1

≤1

≤5

≤500

Phosphate radical/(μ g/L)

≤1

≤1

≤5

≤500

Sulfate radical/(μ g/L)

≤1

≤1

≤5

≤500

Total organic carbon/(μ g/L)

≤20

≤100

≤200

 

 

Typical ultra pure water process flow

Process features: Most of the salt in the water is removed by reverse osmosis, and the MB system is used to produce high-purity water in the later stage, which can effectively prolong the regeneration cycle of the MB system and reduce the use of acid and alkali.

 

Improve the pure water process flow

Process characteristics: The emergence of reverse osmosis and EDI has changed the low desalination efficiency of traditional anion/cation beds, completely abandoning the use of acid and alkali, and achieving green production throughout the entire process.

Full membrane pure water process flow

Process characteristics: The full membrane water treatment process further optimizes and improves the pretreatment system, enhances the pretreatment effect, broadens the inlet conditions, and can effectively achieve the recycling and reuse of reclaimed water.