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
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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 increas

Method used

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Examples

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Example Embodiment

[0042] (Example 1)

[0043] The sand filter device uses the sand filter device (trade name DynaSand Filter) manufactured by Sanki Kogyo Co., Ltd., and the porous filter membrane (MF) uses the porous filter membrane (trade name MicrozaUNA-620A) manufactured by Asahi Kasei Chemical Co., Ltd., and the total membrane area is 100m. 2 The monovalent ion selective permeability ion exchange membrane for electrodialysis uses cation exchange membranes (trade names Neosepta, CIMS) and anion exchange membranes (trade names Neosepta, ACS) manufactured by ASTOM. The total membrane area of ​​the exchange membranes 220m 2 , The first stage reverse osmosis membrane (RO) uses 1 reverse osmosis membrane (trade name HU10155EI) manufactured by Toyobo Co., Ltd., and the second stage reverse osmosis membrane (RO) uses 2 reverse osmosis membranes manufactured by FILMTEC (Trade name BW30-400). And prepare the membrane processing equipment suitable for each separation membrane separately to form figure 2 ...

Example Embodiment

[0047] (Example 2)

[0048] In the brine treatment equipment of Example 1, a waste heat heating device 20 is further provided between the sand filter device 10 and the porous filter device 30, and the waste heat 21 generated by the power station that supplies power to the device is used to heat the filtered water 11; Part of the impermeable membrane water 31 of the filter device 30 is returned to the inlet of the sand filter device 10 for effective use of heat and seawater; the seawater treatment capacity is 480,000 kg / day, and the membrane area increases in proportion to the seawater treatment capacity; the setting is reversed The recovery rate in the permeation device is such that the total of the first stage and the second stage is 28%. Except for the above differences, the specifications are the same as those in Example 1. The composition image 3 Membrane processing equipment shown. Using the waste heat heating device 20, the average seawater temperature at the entrance of the...

Example Embodiment

[0049] (Example 3)

[0050] In the brine treatment equipment of Example 2, an agglomeration precipitation device 100 that removes divalent ions from the impermeable 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 installed. Except for this, the same salt water treatment facility as the salt water treatment facility of Example 2 is configured. The general structure of the device is as figure 1 Shown.

[0051] In the agglomeration precipitation device 100, an excessive amount of sodium hydroxide is added to the impermeable membrane water 81 to precipitate magnesium ions, and then sodium carbonate and barium carbonate are added to precipitate calcium ions and sulfate ions, and boron is removed by ion exchange resin. After that, it is decarbonated and becomes ocean discharge water.

[0052] As the salt electrolysis device 60, a fluorine-based ion exchange membrane (manufact...

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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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