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Method for adjusting quality of water produced by desalting sea water by reverse osmosis method by using bipolar membrane

A technology of reverse osmosis and bipolar membrane, applied in the field of chemical treatment, can solve the problems of instability, up-to-standard and unsatisfactory quenching and tempering effect.

Active Publication Date: 2011-08-17
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the relatively late start in China, from the initial water desalination without conditioning to simple conditioning, but due to the lack of technical means and methods, the conditioning effect is not ideal, such as pH instability, and the conditioning is up to the standard , but soon deviates from

Method used

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  • Method for adjusting quality of water produced by desalting sea water by reverse osmosis method by using bipolar membrane
  • Method for adjusting quality of water produced by desalting sea water by reverse osmosis method by using bipolar membrane
  • Method for adjusting quality of water produced by desalting sea water by reverse osmosis method by using bipolar membrane

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Effect test

Embodiment 1

[0027] The seawater that has undergone flocculation, sedimentation and sand filtration is used as the influent, and the bipolar device is a BMP2-500 device, with 40 bipolar membranes of 200*400, and 40 pairs of one-bivalent separation membranes for the anion membrane and the anode membrane, 80 A 200*400 elastic separator, the negative electrode is a titanium-coated ruthenium electrode, and the anode is a platinum electrode. 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. Flow the acid solution in the acid chamber through the limestone deposit to obtain a calcium bicarbonate solution, and then use a metering pump to inject the calcium carbonate solution into the produced water from seawater desalination and mix evenly so that the conten...

Embodiment 2

[0029] 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. Flow the acid solution in the acid chamber through the limestone deposit to obtain a calcium bicarbonate solution, and then use a metering pump to pump the calcium carbonate solution into the produced water from seawater desalination and mix evenly so that the content of bicarbona...

Embodiment 3

[0031] 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 cathode electrode is a stainless steel electrode, and the anode is a titanium-coated ruthenium electrode. The current density is 300A / m 2 , the flow velocity on the surface of the membrane is 10cm / s, and the polar liquid is 5% sodium chloride solution. Flow the acid solution in the acid chamber through the limestone deposit to obtain a calcium bicarbonate solution, and then use a metering pump to inject the calcium carbonate solution into the produced water from seawater desalination and mix evenly so that the content of bicarbonate in the produced water is 100 mg / L. Then use the metering pump to add the lye in the bipolar membrane alkali chamber to the produc...

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Abstract

The invention relates to a chemical treatment method, in particular to a method for adjusting the quality of water produced by desalting sea water by using chemical dynamic balance. The method comprises a step of: placing initially treated sea water into a bipolar membrane device and a reverse osmosis sea water desalting device respectively, wherein acid produced by the bipolar membrane device flows through limb stone mineral deposit at the first time and is partially mixed with the water produced by the reverse osmosis device so that the concentration of bicarbonate radical of the produced water is increased; and an aim of adjusting the quality of the produced water is fulfilled by partially mixing the alkali liquor in the bipolar membrane device and the produced water. The method has the advantages that: in a sea water desalting occasion, other reagents are not needed and the quality adjustment of the desalted sea water is realized, so the problem that hydrochloric acid and carbon dioxide in some places are inconvenient to transport is solved, and the doubt that people need to add other reagents to desalt the sea water is eliminated. The method can be widely applied to sea water desalting occasions.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a method for regulating the water quality of water produced in seawater desalination by utilizing chemical dynamic balance. technical background [0002] The total global water reserves are 1.386 billion km 3 , seawater accounts for 96.5%, and the surface water and shallow groundwater available to humans are only 0.79%, and the distribution is extremely uneven with regions and seasons. According to the data analysis provided by the United Nations, China's total water resources are 2812.4 billion m 3 , ranking sixth in the world, China's per capita water resources are 2340m 3 , ranking 109 globally. By the middle of this century, when China's population is predicted to be 1.6 billion, the per capita water resources will be 1600m 3 , becoming a country with severe water shortage. Among the 668 cities in China, about 400 are short of water, and about 108 are seriously short of wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/66C02F103/08
CPCY02A20/131
Inventor 金可勇金水玉高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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