CN110248723B - Cleaning liquid for water contact member, cleaning agent and cleaning method - Google Patents
Cleaning liquid for water contact member, cleaning agent and cleaning method Download PDFInfo
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- CN110248723B CN110248723B CN201880010367.8A CN201880010367A CN110248723B CN 110248723 B CN110248723 B CN 110248723B CN 201880010367 A CN201880010367 A CN 201880010367A CN 110248723 B CN110248723 B CN 110248723B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/06—Membrane cleaning or sterilisation ; Membrane regeneration with special washing compositions
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/08—Liquid soap, e.g. for dispensers; capsuled
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/08—Acids
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
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Abstract
A cleaning solution and detergent containing free chlorine and water-contact member combined with chlorine compound, total chlorine (Cl)2) Molar ratio (Cl) to nitrogen atom(s) N derived from bound chlorine compound2/N) is 1 or more, the washing solution has a pH of 9 or more, and the detergent has a pH of 12 or more. The washing liquid can be prepared by diluting the detergent with water. A method of washing a water contact member, which washes the water contact member using the washing liquid.
Description
Technical Field
The present invention relates to a cleaning solution, a cleaning agent, and a cleaning method for cleaning water-contact members (water-contact chambers) such as UF membranes (ultrafiltration membranes), MF membranes (microfiltration membranes), filters, piping, pressure gauges, and flow meters.
Background
In a membrane separation apparatus (a turbidity removal membrane apparatus) using a UF membrane or an MF membrane, since a separation membrane is contaminated, a cleaning fluid (water and/or gas) is generally intermittently supplied every 30 seconds to 60 minutes to physically clean the membrane.
Since the fouling that cannot be removed even by this physical washing is deposited on the membrane, the filtration capacity of the membrane is gradually reduced.
Therefore, the membrane cleaning apparatus requires regular or irregular chemical washing with chemicals.
Documents of the prior art
Patent documents:
patent document 1: japanese patent laid-open publication No. 2015-97991;
patent document 2: japanese patent laid-open publication No. 2009-195823.
Disclosure of Invention
The invention aims to provide a cleaning solution, a detergent and a cleaning method with high cleaning effect.
The gist of the present invention is as follows.
The washing liquid for a water contact member of the present invention is a washing liquid containing free chlorine and a chloramine compound, and the molar ratio (Cl) of total chlorine to nitrogen atoms (N) derived from the chloramine compound2the/N) is 1 or more and the pH is 9 or more.
In one embodiment of the cleaning solution of the present invention, the chloramine compound contains at least one sulfamic acid compound selected from a bound chlorine type sulfamic acid and a salt thereof.
In one embodiment of the cleaning solution of the present invention, the water contact member is at least one of an MF membrane, a UF membrane, a filter, a pipe, a pressure gauge, and a flow meter.
In one embodiment of the washing liquid of the present invention, the pH of the washing liquid is 11 or more.
In one embodiment of the cleaning solution of the present invention, the concentration of bound chlorine in the chloramine compound and chlorine is 100mg/L or more, and the concentration of free chlorine in the chloramine compound and chlorine is 20mg/L or more.
The detergent of the water contact member of the present invention is a detergent containing free chlorine and a chloramine compound, and the molar ratio (Cl) of total chlorine to nitrogen atom (N) derived from the chloramine compound2the/N) is 1 or more and the pH is 12 or more.
In one aspect of the detergent of the present invention, the chloramine compound contains at least one sulfamic acid compound selected from a bound chlorine type sulfamic acid and a salt thereof.
In one embodiment of the detergent of the present invention, the detergent is obtained by mixing sulfamic acid and an alkaline agent and then adding a chlorine agent to the mixture to generate a bound chlorine compound.
In one embodiment of the detergent of the present invention, the concentration of sulfamic acid is 5% by mass or less based on the weight of the final detergent.
In one embodiment of the detergent of the present invention, the water contact member is at least one of an MF membrane, a UF membrane, a filter, a pipe, a pressure gauge, and a flow meter.
The cleaning liquid for the water contact member of the present invention is obtained by diluting the above-mentioned cleaning agent of the present invention with water.
The method for washing a water contact member of the present invention washes the water contact member using the washing liquid of the present invention.
Effects of the invention
The cleaning liquid, the cleaning agent and the cleaning method for the water contact member of the present invention have both the strength of the oxidizing power of the free chlorine agent and the strength of the penetrating power of the bound chlorine agent (chloramine compound) into the water contact member. Therefore, the detergent composition has immediate efficacy as compared with a chlorine-binding agent and has a higher cleaning effect as compared with a free chlorine agent. In addition, the cleaning solution and the cleaning agent of the present invention also have excellent bactericidal effect.
Drawings
FIG. 1 is a schematic diagram showing the structure of a test apparatus used in examples.
FIG. 2 is a graph showing the results of examples and comparative examples.
FIG. 3 is a graph showing the results of examples and comparative examples.
FIG. 4 is a graph showing the results of examples and comparative examples.
FIG. 5 is a graph showing the results of examples and comparative examples.
Fig. 6 is a graph showing the experimental results.
Fig. 7 is a graph showing the experimental results.
Detailed Description
The following describes embodiments of the present invention in detail.
The present invention relates to a cleaning solution, a detergent and a cleaning method, but in the present invention, "cleaning solution" and "detergent" are distinguished as follows.
The washing liquid of the present invention is a liquid used for washing. On the other hand, the detergent of the present invention refers to a product used in circulation. The detergent may be used as it is for washing, but it is generally diluted with water or the like and used as a washing solution for washing.
The washing liquid of the present invention contains free chlorine and a bound chlorine compound. For the washing liquid of the present invention, total chlorine (Cl)2) Molar ratio (Cl) to nitrogen atom(s) N derived from bound chlorine compound2the/N) is 1 or more and the pH is 9 or more.
The washing liquid of the present invention is preferably: the total chlorine concentration was 5000mg-Cl2Less than L, more preferably 200 to 5000mg-Cl2The concentration of the compound is 1000 to 2000mg-Cl2Per L, combined chlorine concentration 100mg-Cl2More preferably 100 to 4980mg-Cl2The concentration of the compound is 300-1980 mg-Cl2Per L, free chlorine concentration 20mg-Cl2More than L, more preferably 20 to 4900mg-Cl2The concentration of the compound is 20-1700 mg-Cl2/L。
The detergent of the present invention is a detergent containing free chlorine and a chloramine compound, total chlorine (Cl)2) Molar ratio (Cl) to N atom of nitrogen atom derived from a chloramine compound2the/N) is 1 or more and the pH is 12 or more.
In the detergent of the present invention, the total chlorine concentration (Cl)2Reduced concentration) is preferably 10% by mass or less, more preferably 1 to 8% by mass, and particularly preferably 3 to 8% by mass. Combined chlorine concentration (Cl)2Reduced concentration) of 0.1% by mass or more, more preferably 0.5 to 3% by mass, and particularly preferably 1 to 2.8% by mass, and free chlorine concentration (Cl)2Reduced concentration) of 0.02 mass% or more, more preferably 0.1 to 10 mass%, and particularly preferably 1 to 5 mass%.
In the present invention, the total chlorine concentration and the free chlorine concentration are determined by JIS K0400-33-10: the DPD method specified in 1999. The combined chlorine concentration was obtained by subtracting the free chlorine concentration from the total chlorine concentration obtained above.
The invention can apply chlorine-based cleaning liquid and detergent to water contact members under alkaline conditions. In the present invention, in addition to the stripping action and hydrolysis action of the organic matter obtained by washing under alkaline conditions, the decomposition action of the organic matter by the bound chlorine compound and the immediate bactericidal washing effect by the free chlorine are synergistically added. Therefore, the present invention can improve the alkali washing effect and sufficiently recover the performance of the contaminated permselective membrane, filter, and the like.
< Water contact Member >
Examples of the water contact member include, but are not limited to, UF membranes, MF membranes, filters, pipes, pressure gauges, and flow meters. Examples of the filter include filters using granular filter materials such as sand and anthracite.
The present invention can effectively exert the washing effect when the MF membrane and the UF membrane are used as washing objects. However, the permselective membrane is not limited thereto, and the present invention can be applied to other permselective membranes, and the membrane material thereof is not limited thereto. In addition, the form of the membrane and the like are not limited at all, and the present invention can be effectively applied to a selectively permeable membrane for water treatment in a wide range of washing fields.
< free chlorine >
Hypochlorous acid and/or hypochlorite is used as the free chlorine. As the hypochlorite, alkali metal salts of hypochlorous acid such as sodium hypochlorite, alkaline earth metal salts of hypochlorous acid such as calcium hypochlorite, and the like can be used. These may be used alone or in combination of two or more.
< conjugated chlorine Compound >
The bound chlorine compound is preferably: hypochlorous acid (HOCl) and a compound having a primary amino group (XNH) are reacted by the reactions shown in the following reaction formulas (1) and (2)2) A compound (XNHCl) in which the hydrogen atom of the amino group obtained by the reaction is substituted with a chlorine atom. Since this compound is weak in oxidation, it can be used as a cleaning liquid or a cleaning agent even for an aromatic polyamide RO membrane having low chlorine resistance, and can also permeate contaminants having high viscosity such as polysaccharides and exert a decomposition action in the interior.
In the present invention, the chlorine compound is preferably incorporated by adding any of a compound having a primary amino group, ammonia and an ammonium salt (hereinafter, these are referred to as "NH2A compound) is mixed with hypochlorous acid and/or hypochlorite. Examples of the compound having a primary amino group include aliphatic amines, aromatic amines, sulfamic acid, Sulfanilic acid (Sulfanilic acid), sulfamoylbenzoic acid (sulfanylbenzoic acid), and amino acids. Examples of the ammonium salt include ammonium chloride and ammonium sulfate. These may be used alone or in combination of two or more. These NH groups2Preferred among these compounds is sulfamic acid (NH)2SO2OH). Stable bound chlorine compounds are obtained when sulfamic acid is used to form monochlorosulfonamide (monochlorosulfamine). The sulfamic acid does not contain carbon, so the TOC value of the detergent is not increased. By using sulfamic acid in combination with an alkaline agent, a very effective washing solution and detergent can be obtained.
And NH2As the hypochlorite to be reacted with the compound, alkali metal salts of hypochlorous acid such as sodium hypochlorite, alkaline earth metal salts of hypochlorous acid such as calcium hypochlorite, and the like can be used. These can be used alone-oneTwo or more of them may be mixed and used.
When sulfamic acid is used as the compound having a nitrogen atom to form bound chlorine, the weight concentration of sulfamic acid used is preferably 5% by mass or less based on the weight of the final detergent. When the concentration of sulfamic acid is more than 5 mass%, chlorine may be easily decomposed.
< ratio of free chlorine to bound chlorine Compound >
Available chlorine (Cl) from free chlorine in the present invention2) Molar ratio (Cl) to nitrogen atom(s) N derived from bound chlorine compound2The molar ratio/N) is 1 or more, preferably 1 to 10, and particularly preferably 1 to 5. By setting the concentration in this range, the prompt cleaning action of free chlorine and the permeation cleaning action of the bound chlorine compound can be obtained with a good balance.
＜pH＞
The cleaning solution of the present invention is formed of an aqueous alkaline solution containing free chlorine and a bound chlorine compound, and has a pH of 9 or more. When the pH of the washing solution is less than 9, sufficient washing performance cannot be obtained. The washing effect is excellent when the pH of the washing solution is high. However, if the amount is too high, the handling property as a cleaning solution is deteriorated, and the risk of corrosion of metal is increased. The pH of the washing solution is preferably 11 or more and 13 or less.
The alkali agent used for adjusting the pH of the washing liquid of the present invention to 9 or more, particularly 12 or more is preferably a hydroxide of an alkali metal such as sodium hydroxide or potassium hydroxide.
The detergent of the present invention is formed of an aqueous alkaline solution containing free chlorine and bound chlorine, and has a pH of 12 or more. When the pH of the detergent is less than 12, the storage stability of the detergent is deteriorated, and the washing effect may be insufficient when the detergent is diluted for use. The pH of the detergent is preferably 13 or more. When the pH of the detergent is too high, the total chlorine concentration is lowered, and the balance with the pH at the time of dilution is deteriorated. The upper pH limit of the detergent of the present invention is 14.
< method for producing washing liquid and detergent >
The washing liquid and the detergent of the invention can be prepared by the following method: reacting sulfamic acid or the like NH2Adding the compound into the aqueous solution of the alkaline agent and dissolvingIn the obtained NH2The aqueous solution of the compound is added with hypochlorous acid and/or hypochlorite and mixed to prepare an aqueous solution of a combined chlorine compound, and then the hypochlorous acid and/or hypochlorite is added to the aqueous solution of the combined chlorine compound and mixed.
The compound having a primary amino group such as sulfamic acid may be added in the form of a salt. Sodium sulfamate, potassium sulfamate, ammonium sulfamate, and the like can be used as the salt.
The cleaning solution of the present invention can be obtained by diluting the cleaning agent prepared as described above with water, preferably pure water, as necessary.
< other ingredients >
In the washing liquid and the detergent used in the present invention, other detergent components may be added within a range not impairing the washing effect.
For example, in order to improve the effect of peeling off the membrane-fouling substances, one or more of other detergent components such as a chelating agent such as a surfactant, EDTA (ethylenediaminetetraacetic acid), EGTA (ethyleneglycol bis (aminoethyl ether) tetraacetic acid), IDA (iminodiacetic acid) and the like may be added.
< washing method >
In the method of washing a water-contacting member using the washing liquid of the present invention, the water-contacting member is brought into contact with the washing liquid. When the water contact member is an MF membrane or a UF membrane, the water supply to the membrane device is stopped, and then the washing liquid is introduced into the membrane device. The washing liquid can be introduced from the raw water inlet of the membrane device or introduced from the treated water outlet and then extruded to the raw water side. After introducing the washing liquid into the apparatus, the membrane is immersed in the washing liquid, or the washing liquid is circulated. When the washing liquid is circulated, air may be blown into the washing liquid. The time for the washing liquid to contact the selectively permeable membrane, including immersion and circulation, is preferably 1 to 24 hours, and particularly preferably about 1 to 18 hours. In the case of a member in contact with water other than the membrane, the time for which the cleaning liquid contacts the member in contact with water is preferably 1 to 24 hours, and particularly preferably about 1 to 18 hours.
Examples
Comparative examples 1 to 4 and example 1
A single membrane module (single fiber module) was prepared using a membrane (effective membrane length 100mm) obtained from a UF hollow fiber membrane module (HFU-2008, Membrane material PVDF, pore diameter 0.01 μm) manufactured by Toray corporation. Thereafter, industrial water (hereinafter, referred to as "mountain house water") in the original region of Wujing city, Qianye county was passed through the single fiber module water passage apparatus shown in FIG. 1 to contaminate the membrane.
The membrane 1 is held at its upper and lower ends by holding members 3a and 3b made of potting material, and is disposed in the column 2. The upper end of the membrane 1 is embedded in the holding member 3a, and the lower end of the membrane 1 passes through the holding member 3b and communicates with the chamber 4 below the column 2. The hydraulic water for the mountain barn is supplied to the lower part of the column 2 (the upper side of the holding member 3 b) through the pipe 5, the pump 6 and the valve 7, and the permeated water flows out from the chamber 4 at the lower end of the column 2 through the valve 8 and the pipe 9. The concentrated water flows out from above the column 2 (directly below the holding member 3 a) through the pipe 10 and the valve 11. Backwash water is introduced into the chamber 4 at the lower end of the column 2 through the pipe 12, the pump 13, and the valve 14, and flows into the membrane 2. Backwash wastewater flows out through a pipe 10 through a branched pipe 15 and a valve 16.
The water passage for membrane fouling was performed by repeating 200 cycles with the following 4 steps as 1 cycle.
Step 1: water filling (30 seconds)
And a step 2: filtration (permeation flow rate 2-4 m)3/m2Day, 28 minutes)
Step 3: backwashing (Water amount 0.6 ~ 1.4 mL/min, 30 seconds)
And step 4: drainage (30 seconds)
The contaminated membrane was passed with pure water, and the permeation flow rate was measured to be 4m3/m2The pressure difference between membranes per day was defined as the pressure difference between membranes before washing. Thereafter, the washing solution shown in Table 1 was introduced into column 2 to carry out the impregnation. Soaking for a predetermined time, discharging the medicinal liquid, washing with pure water, introducing water, and measuring the permeation flow rate to 4m3/m2The pressure difference between membranes per day was defined as the pressure difference between membranes at the predetermined time. After the pressure difference between the films is measured, the chemical solution is introduced again, and the operation is repeated until the total immersion time is 6 to 8 hours. The drug solution introduced each time is prepared again. The measurement result of the pressure difference value between films (immersion time and pressure difference value between films) was measuredThe relationship of (c) is shown in fig. 2. In addition, either wash solution was at pH12 with a total chlorine concentration of about 1200 mg. The free chlorine concentration was measured by the DPD method.
TABLE 1
In addition, the combined chlorine agent is 1: (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.037: 0.017)
Binding chlorine agent 2: (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.020: 0.017)
Binding chlorine agent 3: (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.028: 0.017)
Bound chlorine + free chlorine agent 1: (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.009: 0.017)
[ examination ]
When the sodium hypochlorite of comparative example 1 was used for washing, the differential pressure immediately after washing was significantly reduced (i.e., the effect was high), but the final differential pressure reached was higher than that of the chlorine-binding agents of comparative examples 2 to 4, and therefore the washing effect was inferior to that of the chlorine-binding agents. When the washing was carried out using the chlorine-binding agents of comparative examples 2 to 4, the difference in the final washing results was low and the washing effect was high, but the washing efficacy was inferior to that of the sodium hypochlorite of comparative example 1. When the cleaning solution of example 1 (combined chlorine + free chlorine agent) was used for cleaning, the cleaning solution had immediate effect equivalent to sodium hypochlorite and also had cleaning effect equivalent to chemical and chlorine agents.
Comparative example 5, examples 2 to 4
Membrane washing was performed under the same conditions as in comparative examples 1 to 4 and example 1, except that the washing liquid was the one shown in table 2. (however, since the experimental day was different from those of comparative examples 1 to 4 and example 1, the water quality of raw water was slightly different, and the membrane fouling condition was also slightly different). Note that either wash was at pH12 with a total chlorine concentration of about 1200mg-Cl2And L. The results are shown in FIG. 3.
TABLE 2
Respective example 2 (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.009: 0.017)
Example 3 (molar concentration of sulfamic acid: Cl)2Molar concentration is 0.004: 0.017)
Example 4 (molar sulfamic acid: Cl)2Molar concentration is 0.015: 0.017)
[ examination ]
Examples 2 to 4 showed immediate efficacy equivalent to that of the sodium hypochlorite of comparative example 5, and also showed a lower pressure difference between membranes (higher washing effect) than that of sodium hypochlorite even at the final differential pressure reached.
Comparative examples 6 to 8 and example 5
The detergents shown in Table 3 were diluted so that the total chlorine concentration was 1000mg-Cl2L, a wash adjusted to pH12 by NaOH was prepared.
The total immersion time in the chemical liquid washing step was set to 400 minutes. The same experiment as in the comparative examples and examples was conducted except for this point. However, the experimental day was different from the comparative examples and examples, so that the quality of raw water was slightly different and the state of membrane fouling was slightly different.
TABLE 3
Fig. 4 shows the relationship between the washing time and the differential pressure. It was found that the washing liquid prepared by diluting the washing agent of example 5 was the most rapidly reduced in differential pressure and reached the lowest differential pressure. While the arrival differential pressure in comparative example 6 was still high, the arrival differential pressures in comparative examples 7 and 8 were close to example 5, but the differential pressure decrease rate was slow.
< Experimental examples 1 to 3 >
The following aqueous solutions were evaluated for their bactericidal effects. The following reagents were diluted so that the available chlorine was at a predetermined concentration, and the reagents were brought into contact with the evaluation bacteria for 15 minutes or 1 hour, and the number of viable bacteria was measured. The evaluation bacterium used was Aspergillus niger.
Experimental example 1: sodium hypochlorite aqueous solution (available chlorine 12%)
Experimental example 2: sulfamic acid-based chlorine binding agent Cl2Aqueous solution with a/N ratio of 0.56 and pH14.0
Experimental example 3: free chlorine of sulfamic acid series and combined chlorine agent Cl2Aqueous solution with a/N ratio of 2.08 and pH14.1
The results at 15 minutes are shown in FIG. 5. The results of 1 hour are shown in FIG. 6. And (3) confirming that: in examples 1 and 3, the effective chlorine concentration was 10m/L, and the sterilization was completed in 15 minutes, whereas in example 2, the effective chlorine concentration was 200mg/L, and almost all the bacteria survived even after 1 hour. Although the experimental example 1 had a high bactericidal effect, the detergent was inferior in the cleaning effect because the chemical was the same as in the comparative example 6.
From the above, the washing bactericide of the present invention has high washing and sterilizing effects.
[ measurement experiment of chlorine decomposition Rate ]
Detergents having the formulation shown in Table 4 were prepared using sulfamic acid, an aqueous solution of sodium hypochlorite (12% by mass of available chlorine), 48% sodium hydroxide and pure water. The weight concentration of the sulfamic acid is 2.5-5.0 mass%. The relationship between the molar concentration of sulfamic acid and the molar concentration of residual available chlorine in the detergents obtained from the compounding ratios (i) to (iv), and the decomposition rate of chlorine are shown in fig. 7. As shown in fig. 7, the higher the weight concentration of sulfamic acid, the higher the decomposition rate of chlorine. When the weight concentration of sulfamic acid is 5.0 mass%, the ratio of (available chlorine molar concentration)/(sulfamic acid molar concentration) is 1.01, and is slightly more than 1. Therefore, the weight concentration of sulfamic acid is preferably 5.0 mass% or less. The reason why the decomposition rate of chlorine is increased is presumably that unstable dichlorosulfamic acid is likely to be generated.
TABLE 4
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes can be made therein without departing from the spirit and scope thereof.
The present application is based on japanese patent application 2017-.
Description of the figures
1: a selectively permeable membrane;
2: and (3) a column.
Claims (4)
1. A washing liquid for a water contact member, which is a washing liquid containing free chlorine and a chloramine compound composed only of at least one sulfamic acid compound selected from a bound chlorine type sulfamic acid and a salt thereof, wherein Cl is a molar ratio of total chlorine to a nitrogen atom N derived from the chloramine compound2The concentration of total chlorine is 1000mg-Cl, wherein the concentration of the chlorine is more than 1/N, the pH is more than 112More than/L.
2. The washing liquid according to claim 1, wherein the water contact member is at least one of an MF membrane, a UF membrane, a filter, a piping, a pressure gauge, and a flow meter.
3. The washing liquid according to claim 1 or 2, wherein the concentration of the bound chlorine in the chloramine compound and chlorine is 100mg/L or more, and the concentration of the free chlorine in the chloramine compound and chlorine is 20mg/L or more.
4. A method for washing a water contact member, which comprises washing the water contact member with the washing liquid according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017050165 | 2017-03-15 | ||
| JP2017-050165 | 2017-03-15 | ||
| PCT/JP2018/008978 WO2018168641A1 (en) | 2017-03-15 | 2018-03-08 | Cleaning fluid, detergent, and cleaning method for water-contact member |
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| CN110248723A CN110248723A (en) | 2019-09-17 |
| CN110248723B true CN110248723B (en) | 2020-09-11 |
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| JP (1) | JP6610776B2 (en) |
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| CN110449033A (en) * | 2019-08-27 | 2019-11-15 | 湖北中泉环保技术有限公司 | The cleaning method of ultrafiltration membrane surface organic sediment |
| CN114940906B (en) * | 2022-05-13 | 2023-10-10 | 武汉汉烯科技有限公司 | Efficient corrosive agent suitable for multiphase metal minerals and preparation method thereof |
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| JPH07124559A (en) * | 1993-11-08 | 1995-05-16 | Toyobo Co Ltd | Sterilization of water to be treated in seawater desalting process |
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2018
- 2018-03-08 WO PCT/JP2018/008978 patent/WO2018168641A1/en active Application Filing
- 2018-03-08 JP JP2018513034A patent/JP6610776B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018168641A1 (en) | 2018-09-20 |
| JPWO2018168641A1 (en) | 2019-03-28 |
| JP6610776B2 (en) | 2019-11-27 |
| TWI734898B (en) | 2021-08-01 |
| CN110248723A (en) | 2019-09-17 |
| TW201902563A (en) | 2019-01-16 |
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