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Brine treatment method

A brine and treatment device technology, which is applied in the field of brine treatment, can solve the problems of increased concentration of divalent ions, unstable operation of equipment, etc., and achieve the effect of reducing the cost of raw materials and reducing the amount

Inactive Publication Date: 2009-04-01
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the circulation is formed through the electrodialysis process and the reverse osmosis process in this way, the concentration of divalent ions will increase during the circulation, and there will be a problem that divalent salts are easily precipitated inside the device, resulting in unstable operation of the equipment.

Method used

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Examples

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Embodiment 1

[0043] A sand filter (trade name DynaSand Filter) manufactured by Sanki Industry Co., Ltd. was used for the sand filter, and a porous filter membrane (MF) manufactured by Asahi Kasei Chemical Co., Ltd. (trade name MicrozaUNA-620A) was used for the porous filter membrane (MF). The total membrane area was 100 m 2 , The monovalent ion selective permeation ion exchange membrane used for electrodialysis uses cation exchange membrane (trade name Neosepta, CIMS) and anion exchange membrane (trade name Neosepta, ACS) manufactured by ASTOM Co., Ltd., and the total membrane area of ​​the exchange membrane is 220m 2 , the reverse osmosis membrane (RO) of the first stage uses a reverse osmosis membrane (trade name HU10155EI) manufactured by Toyobo Co., Ltd., and the reverse osmosis membrane (RO) of the second stage uses two reverse osmosis membranes manufactured by FILMTEC (trade name BW30-400). And prepare the membrane processing equipment suitable for each separation membrane separatel...

Embodiment 2

[0048] In the brine treatment equipment of Embodiment 1, a waste heat heating device 20 is further provided between the sand filter device 10 and the porous filter device 30, and the filtered water 11 is heated by using the waste heat 21 generated by a power station that supplies power to the equipment; A part of the non-membrane water 31 of the filter device 30 is returned to the inlet of the sand filter device 10 to effectively utilize heat and seawater; the seawater treatment capacity is 480000kg / day, and the membrane area increases proportionally to the seawater treatment capacity; The recovery rate in the osmosis device is such that the first stage and the second stage add up to 28%, except for the above-mentioned differences, are all the same as the specifications in Example 1, and constitute image 3 The membrane processing equipment shown. The average seawater temperature at the inlet of the porous filtering device 30 is 22° C. by using the waste heat heating device 20...

Embodiment 3

[0050] In the brine treatment equipment of embodiment 2, the coagulation precipitation device 100 that removes divalent ions from the non-permeable membrane water 81 of the reverse osmosis device 80 of the first stage is further provided, and a salt electrolysis device 60 and a dechlorination device 70 are provided, Except for this, the same brine treatment facility as that of Example 2 was configured. The outline of the device consists of figure 1 shown.

[0051] In the coagulation and sedimentation device 100, excessive sodium hydroxide is added to the non-membrane water 81 to precipitate magnesium ions, then sodium carbonate and barium carbonate are added to precipitate calcium ions and sulfate ions, and boron is removed by ion exchange resin, It is then decarbonated and becomes ocean discharge water.

[0052] As the salt electrolysis device 60, a fluorine-based ion exchange membrane (manufactured by Asahi Kasei Chemical Co., Ltd., trade name ACIPLEX-F4401) was used as th...

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Abstract

The present invention provides a method for processing brine, which can use low-concentration brine such as seawater, etc. for manufacturing deionized water such as drinking water, industrial water, etc. and high-purity common salt that can be used for brine electrolysis. The salinity of compressed brine can be easily controlled to a degree equal with that of seawater, and furthermore the amount of custoff is little. The invention relates to a method for manufacturing deionized water, solid slat which can be used for brine electrolysis or high-concentration brine. The method is characterized in that the method uses a brine processor for processing the low-concentration brine. The brine processor comprises an electrodialysis device which uses univalent ion permselectivity cation exchange membrane and univalent ion permselectivity anion exchange membrane, an evaporating concentrating device and reverse osmosis membrane device.

Description

technical field [0001] The present invention relates to a salt water treatment method for producing drinking water from low-concentration salt water such as seawater or salt water, and high-concentration salt water or solid salt that can be used in salt electrolysis. Background technique [0002] Seawater desalination technology using reverse osmosis for drinking water is widely used around the world where water scarcity is a concern. The fresh water obtained by reverse osmosis is the part of seawater that passes through the reverse osmosis membrane, and the part that does not pass through the reverse osmosis membrane is usually discarded into the ocean in the form of concentrated brine with a salt concentration about twice that of seawater. However, in recent years, it has become increasingly difficult to discard concentrated brine into the ocean as environmental awareness has increased. However, incineration of concentrated brine requires a huge cost and is not realistic....

Claims

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Application Information

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IPC IPC(8): C02F1/00C02F1/469C02F1/44C01D3/06
CPCY02W10/37
Inventor 渡边幸平山村晃一大山徹
Owner ASAHI KASEI CHEM CORP
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