Liquid flow type capacitance pretreatment method for sea water desalination

A technology of pretreatment and capacitance method, which is applied in the direction of seawater treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problem of failing to meet FTC seawater desalination influent requirements, and cannot solve the problem of high hardness and high salinity of seawater, FTC Seawater desalination has high energy consumption and other issues, so as to reduce the total dissolved solids, improve the treatment effect and reduce the cost

Active Publication Date: 2005-03-02
SHANGHAI UNIV
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Problems solved by technology

However, using the existing seawater desalination pretreatment method to provide influent water for FTC (fluid flow capacitor method) still has the following disadvantages: (1) The operation is complicated, and if it is not properly protected, it is easy to cause biological pollution
(2) The problem of high hardness and high salinity of seawater cannot be solved, resulting in high energy consumption of FTC seawater desalination, serious scaling, high washing frequency, low water production rate, and difficulty in reducing desalination costs
(3) Need to add medicine to sterilize and prevent scale, resulting in complex equipment and high investment
Therefore, according to the FTC influent index, none of the existing pretreatment methods can meet the FTC seawater desalination influent requirements

Method used

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  • Liquid flow type capacitance pretreatment method for sea water desalination

Examples

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example 1

[0025] Example 1: see figure 1, using seawater with a concentration of 35000mg / L as the water source, the impurities in the seawater are filtered out through the multi-media filter unit 7, and then enter the activated carbon filter unit 8 to remove the odor in the seawater, natural and synthetic dissolved organic matter, micro-pollutants, etc., Then enter the fine filtration unit 9 to remove fine particles with a particle size of 1-5 μm, and at the same time further reduce the pollution index and prevent 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, bacteria CFU / 1...

Embodiment 2

[0026] 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 to remove 96% of hardness, 98% of sulfate, and 51% of chloride in water, and the TDS was reduced by 61%.

[0027] Through the examples, it can be known 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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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, desalination of seawater has become an effective way to use modern technology to open up new water sources on a large scale. In fact, this has become an inevitable trend all over the world. Due to the increasingly prominent water resource crisis, most countries are directly or indirectly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02
CPCC02F1/283C02F1/4691C02F2103/08C02F1/44Y02A20/131
Inventor 方建慧姜华施利毅沈霞邓英朱惟德
Owner SHANGHAI UNIV
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