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In addition to salt water standards:
Desalinated water is the removal or reduction of the contained strong electrolyte which is easy to remove to a certain degree of water. The residual salt content in desalted water should be between 5 and 20 mg / l.
Desalting water process:
Pretreatment + reverse osmosis
Reverse Osmosis Process Description:
Reverse osmosis device is sufficient pressure to the solution of the solvent (usually water) through the reverse osmosis membrane and separated, this process and the natural infiltration of the opposite direction, so called reverse osmosis. After reverse osmosis treatment, so that the content of impurities in the water lower and improve the purity of the water, the desalination rate of 99% or more, and most of the water can be bacteria, colloids and large molecular weight organic removal. Reverse osmosis can adapt to all kinds of salt content of raw water, especially in the high salt content of water treatment works, this desalination water treatment process can get a good technical and economic benefits.
Medium and high pressure boiler supply water standards
|
species |
hardness |
Silica |
Conductivity（250C） |
Alkalinity |
|
A chemical desalting - mixed bed system water |
≈0 |
≤20 |
≤0.3 |
－ |
Process flow
Pretreatment + reverse osmosis + CO2 + bed + bed + bed + mixed bed
Process introduction
Pretreatment filter its main function is to remove more than 20μm particle size of the mechanical impurities, coagulation of small molecules of organic matter and part of the colloid, the water turbidity <1.0NUT, CODMn <1.5 mg / L, iron content <0.05 mg / L , The pollution index (SDI) <4. The system can be backwashed to ensure that the follow-up equipment, the quality of the water produced to extend the service life of equipment.
Reverse osmosis equipment in the process of water separation without phase transition, small size, easy to self-control operation, with a compact, high desalination rate (single membrane test data> 99.5%), low operating pressure, low consumption, PH wide PH For 2-11) without environmental pollution and so on.
In addition to the presence of CO2 CO2 will increase the burden of ion exchange, especially anion exchanger, anion exchanger to shorten the regeneration cycle, increase operating costs, affecting water quality. Therefore, the use of decarbonator to remove free CO2 in water is very necessary.
Positive bed filled with 001 × 7 strong acid cation exchange resin. The bed design flow rate is 20-30m / h. Water of various cations (Na +, K +, etc.) are adsorbed on the ion exchange resin, ion exchange resin on the H + is to the water, to achieve the purpose of removing cations.
Anion bed filled with 201 × 7 strong base anion exchange resin. The running speed of the anion bed design is 20-30m / h. Various anions in water are adsorbed on the ion exchange resin, ion exchange resin OH - is to the water, to remove the anion purpose.
Mixed bed bed filled with special strong acid cation exchange resin 001 × 7MB and 201 × 7MB mixed bed dedicated strong base anion exchange resin, mixed bed effluent conductivity ≤ 0.1us / cm, designed to run the flow rate of 31m / h, through the yin and yang bed leakage In the water a small part of the anion and cation are adsorbed on the mixed bed ion exchange resin, the water conductivity ≤ 0.1us / cm.
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