Washing agent for separation membrane, process for producing the same and method of washing

A manufacturing method and separation membrane technology, applied in the field of cleaning agents, can solve the problems of long cleaning time, harmful trihalomethanes, insufficient cleaning, etc., and achieve the effects of shortening cleaning time, reducing water consumption, and high cleaning effect

Inactive Publication Date: 2010-02-03
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, since organic and inorganic pollutants are mixed, the separation membrane after filtration is cleaned with both alkali and acid. However, the following problems arise: sometimes the membrane pollution source substances cannot be completely removed, and the cleaning becomes insufficient; and Cleaning takes a long time due to both alkaline and acid cleaning
The current situation in this case is that one of organic pollutants and inorganic pollutants cannot be completely removed by using only hypochlorite or acid due to the need for short-term cleaning
[0006] On the other hand, when cleaning with these cleaning solutions containing hypochlorite, the chlorine in the hypochlorite may react with organic matter to generate trihalomethanes that are harmful to the human body, causing problems.

Method used

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  • Washing agent for separation membrane, process for producing the same and method of washing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] As raw water, use water with a turbidity of about 1 to 5 degrees (measured using a kaolin standard solution manufactured by Kanto Chemical Co., Ltd. as a reference) and a total organic carbon (TOC) of 0.5 mg / L to 1.5 mg / L. For surface water in rivers, the membrane modules that have been in operation for 6 months and have a differential pressure between the membranes of 200kPa are cleaned as described later.

[0060] As a cleaning solution, use a hydrogen peroxide aqueous solution (0.88mol / L) to mix ferrous chloride and malic acid so that the concentration of ferrous chloride is 0.0008mol / L and the concentration of malic acid is 0.05mol / L. The prepared cleaning solution was circulated and filtered for 6 hours. Thereafter, the cleaning solution was removed from the module, and the separation membrane was washed with 500 liters of UF filtered water for 2.5 hours as a rinsing step.

[0061] As a result of cleaning by the above-mentioned cleaning method, when the filtration...

Embodiment 2

[0064] When cleaning the polluted membrane module of embodiment 1, as cleaning liquid, use in the aqueous solution (0.88mol / L) of hydrogen peroxide, mix ferrous chloride and tartaric acid and make the concentration of ferrous chloride be 0.0008mol / L, The concentration of tartaric acid is 0.05mol / L and the cleaning liquid prepared, carries out 6 hours circulation filter cleaning. Thereafter, the cleaning solution was removed from the module, and the separation membrane was washed with 500 liters of UF filtered water for 2.5 hours as a rinsing step.

[0065] As a result of cleaning by the above-mentioned cleaning method, when the filtration capacity of the membrane when not in use is 100%, the filtration capacity of the membrane which was reduced to 10% before cleaning returns to 100% after cleaning. The total cleaning time in this cleaning method was 8.5 hours. Also, generation of chlorine gas and heat of reaction were not observed.

[0066] Filtration operation was performed...

Embodiment 3

[0068] When cleaning the polluted membrane module of embodiment 1, as cleaning liquid, use the aqueous solution (0.88mol / L) of hydrogen peroxide to mix ferrous chloride and tartronic acid and make the concentration of ferrous chloride be 0.0008mol / L, the concentration of tartronic acid is 0.05mol / L and the cleaning solution prepared is carried out 6 hours of circulating filtration cleaning. Thereafter, the cleaning solution was removed from the module, and the separation membrane was washed with 500 liters of UF filtered water for 2.5 hours as a rinsing step.

[0069] As a result of cleaning by the above-mentioned cleaning method, when the filtration capacity of the membrane when not in use is 100%, the filtration capacity of the membrane which was reduced to 10% before cleaning returns to 100% after cleaning. The total cleaning time in this cleaning method was 8.5 hours. Also, generation of chlorine gas and heat of reaction were not observed.

[0070] Filtration operation ...

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Abstract

Provided is a cleaning agent or cleaning method of a separation membrane which has cleaning effects equal or superior to those of conventional cleaning methods in cleaning a separation membrane used for filtration of drinking water, industrial water, river water, lake water, groundwater, reservoir water, secondary effluent, waste water, sewage water or the like; does not include a hypochlorite sothat it neither generates a toxic gas nor adversely affects the human health; and needs less cleaning time owing to elimination of a rinsing step with a large amount of water. The cleaning agent or cleaning method according to the present invention is therefore safe and economical. Disclosed by the present invention is a preferred cleaning agent containing hydrogen peroxide, a heavy metal compoundand a hydroxydicarboxylic acid, wherein the hydroxydicarboxylic acid is selected from the group consisting of malic acid, tartaric acid, tartronic acid, citramalic acid, dioxymaleic acid and dioxymalonic acid, while the heavy metal compound is an iron ion.

Description

technical field [0001] The present invention relates to a cleaning agent, a manufacturing method and a cleaning method of the cleaning agent, which are used for cleaning drinking water, industrial water, river water, lake water, underground water, water storage, secondary treatment water of sewage, sewage, waste water through a separation membrane Separation membrane after filtration treatment. Background technique [0002] When membranes are used to filter raw water (such as drinking water, industrial water, river water, lake water, groundwater, stored water, sewage secondary treatment water, sewage, waste water, etc.), the suspended matter or size in the raw water is the size of the membrane used. Substances above the pore diameter (hereinafter referred to as "membrane pollution source substances") are blocked by the membrane, forming a concentration polarization and a filter cake (ケク) layer. At the same time, the pores are blocked, which increases the filtration resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C11D7/18C11D7/26C11D17/08
CPCB01D65/02B01D2321/168C11D3/1213C11D7/10C11D3/2086C11D3/046B01D2321/162C11D11/0041C11D7/20C11D7/265C11D3/3947C11D7/26C11D7/02B01D65/06
Inventor 五条豊植田笃齐
Owner ASAHI KASEI CHEM CORP
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