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3, medicine: medical water more requirements for conductance and bacteria, the material material used in the system has requirements, more use of stainless steel products. Usually pure water is followed by sterilization devices.

4, the electronics industry: the electronics industry has the highest requirements for water, and most electronic water requirements reach 18 trillion. The requirement for electrical resistivity is only a small part of the electronic water, which has high requirements for many ions, so there are special requirements for installation materials and pipes. The selection process is also the most complex. It is usually necessary to add polishing mixed bed and ultrafiltration, sterilization, nitrogen sealed water tank and other devices after EDI, and the cost is also very high.

6. According to the water quality requirements, the process usually used

1, the conductivity of the production water is required to be 10~20μs/cm: RO pretreatment + primary reverse osmosis (chemical)

2, water conductivity 2~9μs/cm: using RO pretreatment + secondary reverse osmosis (pharmaceutical, chemical) or using RO pretreatment + softening + primary reverse osmosis +EDI(pharmaceutical, chemical)

3, the conductivity of water production is less than 0.2~2μs/cm: The use of RO pretreatment + one stage reverse osmosis + mixed bed

4, water production resistance 5~ 13mω.cm: R0 pretreatment + softening + primary reverse osmosis +EDI or RO pretreatment + secondary reverse osmosis +EDI(medicine, chemical, electronics, power generation)

5, water production resistance 13~ 17mω.cm: R0 pretreatment + softening + primary reverse osmosis +EDI+ mixed bed or RO pretreatment + secondary reverse osmosis +EDI+ mixed bed (medicine, chemical, electronics, power generation)

6, water production resistance 18mω.cm: using RO pretreatment + secondary reverse osmosis +EDI+ mixed bed + sterilization + nitrogen seal.

Seven, the key and difficult questions of pure water treatment

1. What are the main measures to reduce acid and base consumption?

(1) Ensure water quality;

(2) Ensure the quality of regeneration and extend the cycle of water production;

(3) Ensure the quality of the regenerated liquid,