Pre-treatment method for sea salt water

Abstract

A kind of seawater treatment method, it comprises the following steps: Step 1: Clarify, produce some muddy waste water, use cleaning agent in seawater, this cleaning agent is alkali metal ferrate, alkali metal aluminum carbonate, alkali metal Ammonium phosphate double salt and ionic hydrocarbon polymer with a molecular weight of 8-15 million are compounded at a ratio of 1:3.8-6.8:1-8:0.01-0.08, dissolved in amine-containing Alkaline solution reacts for 5 hours, slowly cools down to 65-90 degrees Celsius, and heats it for 5 hours to form a strong viscous polymer; step 2: perform ion exchange treatment in ion exchange equipment; step 3: seawater treated in step 2 The salty water enters the desalination equipment for desalination to obtain finished fresh water and concentrated water; step 4: part of the concentrated water obtained in step 3 is used as pure brine for industrial use, and the other part is used as pure brine for regeneration to return to the ion exchange equipment in step 2 for ion exchange The resin is regenerated to produce recycled wastewater.

Description

technical field [0001] The invention relates to a sea salt water desalination treatment method, in particular to a sea salt water treatment method. Background technique [0002] In the prior art, the desalination treatment of seawater generally adopts such as figure 1 The process flow shown. [0003] Desalination in this technological process includes one or more combinations of electrodialysis, reverse osmosis, distillation and other equipment. The five processes before desalination in this technological process are collectively referred to as seawater treatment. This technological process has been widely used, and the fresh water output ranges from a few kilograms, hundreds of tons, to thousands of tons, and there are examples in operation all over the world. [0004] But this technological process has substantive defect: [0005] 1. Cannot remove scaling compounds in treated water, resulting in high power consumption; [0006] The clarifying agent it uses is a conven...

AI Technical Summary

Problems solved by technology

[0005] 1. Cannot remove scaling compounds in treated water, resulting in high power consumption;

[0006] The clarifying agent it uses is a conventional aluminum-iron salt compound, such as aluminum sulfate, ferric chloride, aluminum chloride, etc., and its polymers. In salty water, its electric neutralization and clarification mechanism is very limited, not only the clarification effect is very poor, but also most of the scaling compounds in the water cannot be removed

Although antiscalants are added before desalination in the process, it only plays the role of complexing scaling compounds in water, trying to improve the solubility of scaling compounds in water, but hidden dangers still exist and the effect is limited

Scaling and clogging in the desalination equipment still occur frequently, resulting in frequent shutdown, dismantling and backwashing of the desalination system

And the membrane flux is reduced, so the energy consumption is high

[0007] 2. Low utilization rate of water resources;

[0009] 3. Wastewater resources cannot be effectively utilized;

[0010] The above three types of wastewater contain all the resources and pollutants in the sea and salt water except fresh water. Due to the large amount and mixed, it is currently impossible to purify and recycle at low cost. As a result, resources are wasted and the environment is polluted. The wastewater is discharged into the land Cause land salinization can not be restored

[0011] 4. The system is complex and requires a large investment;

[0012] The processing part of this process includes 5 basic procedures, and additional auxiliary equipment and automatic control system are required. The system is more complex, the reliability is worse, the probability of error and accident is high, and the investment is high.

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