Seawater desalinization pretreatment method by using bipolar membrane through reverse osmosis process

A technology of reverse osmosis and treatment method, which is applied in the field of pretreatment in the process of seawater desalination, to achieve the effect of convenient operation, solving scaling and less investment

Active Publication Date: 2011-06-29
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Starting from drinking water standards and fully considering economic benefits, the present invention researches a bipolar membrane seawater desalination water production regulator with low investment, low operating cost, conv...

Method used

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  • Seawater desalinization pretreatment method by using bipolar membrane through reverse osmosis process
  • Seawater desalinization pretreatment method by using bipolar membrane through reverse osmosis process
  • Seawater desalinization pretreatment method by using bipolar membrane through reverse osmosis process

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Effect test

Embodiment 1

[0038] The seawater that has undergone flocculation, sedimentation and sand filtration is used as the influent, the bipolar device is BMP2-500 device, 40 pieces of 200*400 bipolar membranes are used, the positive membrane adopts 40 pieces of CSO-bivalent separation membrane, and the negative membrane adopts AMV membrane, 80 sheets of 200*400 elastic separators, titanium-coated ruthenium electrodes for the cathode, and platinum electrodes for the anode. The current density adopts 1000A / m 2 , the flow velocity on the membrane surface is 5cm / s, 3% sodium sulfate solution is used as the polar liquid, and the concentration of the acid solution in the acid chamber or the lye in the alkali chamber reaches about 10% by means of partial circulation. The lye in the alkali chamber is added to the original seawater with a metering pump at a rate of 10mL of lye per liter of seawater, so that the pH of the seawater rises to 10.4. Finally, after filtering with a 0.45 micron microfiltration ...

Embodiment 2

[0040] The seawater that has undergone flocculation, sedimentation and sand filtration is used as the influent, and the bipolar device is BMP2-2500, using 20 pieces of 400*800 bipolar membranes, and 20 pairs of one-bivalent separation membranes for the negative and positive membranes, 60 A 400*800 elastic separator, the negative electrode is a titanium-coated ruthenium electrode, and the anode is a platinum electrode. The current density is 500A / m 2 , the flow velocity on the membrane surface is 6cm / s, 5% sodium sulfate solution is used as the polar liquid, and the concentration of the acid solution in the acid chamber or the lye in the alkali chamber reaches about 5% by means of partial circulation. The lye in the alkali chamber is added into the original seawater with a metering pump at a ratio of 15 mL of lye per liter of seawater, so that the pH value of the seawater is raised to 10.3. Finally, after filtering with a 0.45 micron microfiltration membrane, the bipolar membr...

Embodiment 3

[0042] The seawater that has undergone flocculation sedimentation and sand filtration is used as the influent. The bipolar device is a BMP2-2500 device, and 20 bipolar membranes of 400*800 are used. The anion membrane and the anode membrane adopt a bivalent separation membrane CMO+AMV membrane 20 pairs, 60 sheets of 400*800 elastic separators, the negative electrodes are titanium coated ruthenium electrodes, and the anodes are platinum electrodes. The current density is 800A / m 2 , the flow velocity on the membrane surface is 7cm / s, 6% sodium sulfate solution is used as the polar liquid, and the concentration of the acid solution in the acid chamber or the lye in the alkali chamber reaches about 10% by means of partial circulation. Add the acid solution in the acid chamber of the bipolar membrane device directly into the raw seawater for acidification, and add the acid solution in the acid chamber of the bipolar membrane device into the raw seawater with a metering pump at a ra...

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Abstract

The invention relates to a chemical treatment method, in particular to a seawater desalinization pretreatment method. The pretreatment method comprises the following steps of: placing seawater in a bipolar membrane device, wherein a bipolar membrane is a divalent separation membrane, and a polar liquid is a sodium chloride or sodium sulfate solution with mass concentration of 1-10 percent; mixing an alkali liquid in an alkali chamber of the bipolar membrane device with inlet water, filtering the alkalized inlet water by using a micro-filtering membrane of 0.1-0.5 micrometer, and regulating a pH value to be 8.2-8.8 by using an acid liquid in an acid chamber of the bipolar membrane device for seawater desalinization treatment. The pretreatment method has the advantages of less investment, low operating cost and simple operation. By the pretreatment method, boron content in yielding water accords with the drinking water standard, a yielding water quality regulating method and process of seawater desalinization by using the bipolar membrane applied in a large-scale project can be carried out, and the technical bottleneck of seawater desalinization development is overcome. Therefore, the pretreatment method can be widely applied in a seawater desalinization occasion.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a pre-pretreatment method in the seawater desalination process. technical background [0002] More than 70% of the earth's surface is covered by water, and the remaining land, which accounts for about 30% of the earth's surface, also has water. The total water volume of the earth is 13.86 billion tons, of which fresh water reserves are 350 million tons, accounting for 2.53% of the total reserves. Due to development difficulties or technical and economic limitations, the relatively easy to develop and utilize only accounts for 0.34% of the total fresh water reserves, accounting for 10.46 billion tons, which is less than one ten thousandth of the global total water reserves. According to the analysis provided by the United Nations, China's total water resources are 280 million tons, ranking sixth in the world, and China's per capita water resources are 2,340 tons, ranking 109 in the ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/08
CPCY02A20/131
Inventor 金可勇金水玉高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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