Liquid flow type capacitance pretreatment method for sea water desalination

Abstract

The present invention belongs to the field of sea water desalting technology. The pre-treatment process includes the technological steps of treating sea water successively in medium filtering unit, carbon filtering unit, precise filtering unit, ultrafiltering unit and nanometer membrane unit; and makes water reach the requirement of liquid flow type capacitive sea water desalter. The pre-treatment process can eliminate most of the hard ions in sea water and lower the concentration of water, so as to prevent scaling in sea water desalter, prolong the service life of sea water desalter, raise the efficiency of sea water desalter and lower cost of desalting sea water.

Description

Technical field:

[0001] The invention relates to a pretreatment method for seawater desalination by a liquid-flow capacitance method, and belongs to the field of seawater desalination treatment. Background technique:

[0002] Today, the shortage of fresh water resources has become a worldwide problem. At present, 500 million people in the world do not have access to clean water. By 2025, this number will increase fivefold to 2.8 billion, accounting for about 35% of the estimated global population of 8 billion. %. The solutions to the water shortage problem include continuing to find water, remote water transfer, waste water recycling, and formulating water conservation measures. However, to take advantage of

[0003] Modern technology has opened up new water sources on a large scale, and seawater desalination has become an effective way. In fact, this has become an inevitable trend all over the world. Due to the increasingly prominent water resource crisis, most countrie...

Examples

example 1

[0026]Example 1: Referring to Figure 1, seawater with a concentration of 35000mg / L is used as the water source, and the impurities in the seawater are filtered out through the multimedia filter unit 7, and then enters the activated carbon filter unit 8 to remove the odor in the seawater, natural and synthetic dissolved organic matter , micro-pollutants, etc., and then enter the fine filtration unit 9 to remove fine particles with a particle size of 1-5 μm, while further reducing the pollution index and preventing activated carbon particles from entering the downstream membrane module. Then pass through the ultrafiltration membrane unit 10 to remove pollutants on the order of microorganisms and bacteria, as well as pollutants on the order of harmful poisons, carcinogens, and viruses. At this time, the seawater has become clean brine after the above treatment, the turbidity of the effluent is NTU<0.1, suspended solids<1mg / L, total organic carbon content is 8-10mg / L, SDI<1, bacter...

Embodiment 2

[0027] Embodiment 2: Using 20000mg / L seawater along the coast of China as the water source, after the same treatment process as the above-mentioned embodiment, the seawater has become clean brine, and then the booster pump enters the nanofiltration unit at 1.3Mpa and a temperature of 20°C Treatment 13 was used for treatment, and it was tested that 96% of hardness, 98% of sulfate, and 51% of chloride in water could be removed, and TDS was reduced by 61%.

[0028] Through the examples, it can be seen that the pretreatment method of the present invention can supply water to the seawater desalinator that meets the water quality requirements, and the water production rate can reach up to 70%, and the removal rate can reach more than 70%.

Technical field:

[0001] The invention relates to a pretreatment method for seawater desalination by a liquid-flow capacitance method, and belongs to the field of seawater desalination treatment. Background technique:

[0002] Today, the shortage of fresh water resources has become a worldwide problem. At present, 500 million people in the world do not have access to clean water. By 2025, this number will increase fivefold to 2.8 billion, accounting for about 35% of the estimated global population of 8 billion. %. The solutions to the water shortage problem include continuing to find water, remote water transfer, waste water recycling, and formulating water conservation measures. However, to take advantage of

[0003] Modern technology has opened up new water sources on a large scale, and seawater desalination has become an effective way. In fact, this has become an inevitable trend all over the world. Due to the increasingly prominent water resource crisis, most countrie...

Examples

example 1

[0026]Example 1: Referring to Figure 1, seawater with a concentration of 35000mg / L is used as the water source, and the impurities in the seawater are filtered out through the multimedia filter unit 7, and then enters the activated carbon filter unit 8 to remove the odor in the seawater, natural and synthetic dissolved organic matter , micro-pollutants, etc., and then enter the fine filtration unit 9 to remove fine particles with a particle size of 1-5 μm, while further reducing the pollution index and preventing activated carbon particles from entering the downstream membrane module. Then pass through the ultrafiltration membrane unit 10 to remove pollutants on the order of microorganisms and bacteria, as well as pollutants on the order of harmful poisons, carcinogens, and viruses. At this time, the seawater has become clean brine after the above treatment, the turbidity of the effluent is NTU<0.1, suspended solids<1mg / L, total organic carbon content is 8-10mg / L, SDI<1, bacter...

Embodiment 2

[0027] Embodiment 2: Using 20000mg / L seawater along the coast of China as the water source, after the same treatment process as the above-mentioned embodiment, the seawater has become clean brine, and then the booster pump enters the nanofiltration unit at 1.3Mpa and a temperature of 20°C Treatment 13 was used for treatment, and it was tested that 96% of hardness, 98% of sulfate, and 51% of chloride in water could be removed, and TDS was reduced by 61%.

[0028] Through the examples, it can be seen that the pretreatment method of the present invention can supply water to the seawater desalinator that meets the water quality requirements, and the water production rate can reach up to 70%, and the removal rate can reach more than 70%.

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