CN105439247A - Recycling method for severely contaminated RO (reverse osmosis) membranes - Google Patents
Recycling method for severely contaminated RO (reverse osmosis) membranes Download PDFInfo
- Publication number
- CN105439247A CN105439247A CN201511030962.2A CN201511030962A CN105439247A CN 105439247 A CN105439247 A CN 105439247A CN 201511030962 A CN201511030962 A CN 201511030962A CN 105439247 A CN105439247 A CN 105439247A
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- China
- Prior art keywords
- film
- reverse osmosis
- acid
- osmosis membrane
- reuse method
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/10—Accessories; Auxiliary operations
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/144—Wave energy
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a recycling method for severely contaminated RO (reverse osmosis) membranes. The recycling method is characterized in that a membrane with low flux is subjected to at least one acid treatment and/or at least one alkali treatment, then is mixed with an oxidized membrane and recycled, wherein the mixing mass ratio of the membrane with the low flux to the oxidized membrane is 1:(0.1-10). According to the recycling method, two scrapped membranes are mixed after pretreatment, so that the two scrapped membranes can be recycled effectively, and the effects of waste utilization and environmental protection can be realized well while the cost is reduced.
Description
Technical field
The present invention relates to the reuse field of reverse osmosis membrane, particularly, relate to one and be heavily polluted reverse osmosis membrane reuse method.
Background technology
Under the support energetically of country, the systems grow that use reverse osmosis membrane carries out Treated sewage reusing is many, but when if pre-treatment is improper or water source fluctuation is larger, the film of Treated sewage reusing may be just contaminated several days time, reverse osmosis membrane main manifestations after contaminated is: although the water yield sharply more than drop by half or water production rate reach requirement, but produce water conductivity and rise more than one times, due to sewerage disposing requirement cannot be reached or produce water water quality requirement, can only change this RO film.And the film after discarding is glass steel material due to its shell, cannot continues to utilize, can only disposition of solid waste be used as.
According to existing technical process, contaminated film is divided into two classes, one class refers to by after the severe contaminations such as organism, bacterium, oils thing, dirty thing, causes its product water water yield low, the contaminated film that the water production rate that this type of film often cannot recover the water yield by conventional cleaning is low;
Another kind of, owing to there is the oxidizing substance such as chlorine residue, ozone in feed water by reverse osmosis, in use, under the effect of above-mentioned oxidizing substance, cause film oxidized, make it produce the water water yield and rise, produce water conductivity and raise, film ratio of desalinization is only 30-50%, and this type of film also often cannot be recovered by cleaning.
In existing technique, the film due to above-mentioned two kinds of pollution methods is difficult to recover it by cleaning and uses, so, often go out of use, cause a large amount of wastes and loss.
Summary of the invention
The present invention is intended to overcome above-mentioned defect, utilizes the common feature that above-mentioned two kinds of films exist, and namely, goes out water suspension and substantially can be reduced to zero, system delivery turbidity is low, is generally less than 1NTU, so, propose in the present invention, by using being used as ultra-filtration membrane after its oxidative deformation.
Particularly, one provided by the invention is heavily polluted reverse osmosis membrane reuse method, it is characterized in that: the low film of water production rate after acid at least one times and/or alkaline purification at least one times, reuse after mixing with oxidized film;
Wherein, the film that above-mentioned water production rate is low is 1:0.1-10 with the mixing quality ratio of oxidized film.Be preferably 1:1-5, most preferably be 1:1.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, the low film of above-mentioned water production rate for by after organism, bacterium, oils thing, dirty thing severe contamination, produce the water water yield lower than 50% film.This type of film generally cannot be reduced by the cleaning way of routine, therefore, often selects to scrap process in existing industrial application.
Further, provided by the inventionly be heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, above-mentioned oxidized film is effect by oxidizing substance in feed water by reverse osmosis, and film body is oxidized, water production rate is higher than 150%, and film ratio of desalinization is the film of 10-50%.This type of film product water conductivity is high, and film ratio of desalinization is only 10-50%, often cannot be recovered by cleaning, therefore, also often selects to scrap process in existing industrial application.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, in above-mentioned acid-treated process selected acid solution is oxidizing acid.
Further, provided by the inventionly be heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, above-mentioned acid is selected from the composition of one or more in the oxidizing acids such as hydrochloric acid, sulfuric acid, nitric acid, hypochlorous acid acid, liquid chlorine, dioxide peroxide, Peracetic Acid, bromochlorohydantoin, trichloroisocyanuric acid.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, in the process of above-mentioned alkaline purification selected alkali lye is alkaline oxidiser.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, above-mentioned alkali is selected from the composition of one or more in clorox, sodium chlorate, Surchlor GR 60.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, the mass percent concentration of above-mentioned bronsted lowry acids and bases bronsted lowry is 1-5%.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, the aquatic products amount of above-mentioned film after acid at least one times and/or alkaline purification is at least one times greater than 150%, and its ratio of desalinization is 20-80%.
Further, be provided by the inventionly heavily polluted reverse osmosis membrane reuse method, also there is such feature: namely, through the film of reuse method process can be used as ultra-filtration membrane to use.
effect of the present invention:
The present invention makes the two classes film that gives up by effective reuse, while reducing costs, also can well can play the effect of the useless environmental protection of profit by two kinds being scrapped the mode mixed after film carries out pre-treatment.
In the method for the invention, because two class films are all corroded by strong acid or strong oxidizer, fenestra increases, the comparatively high yield water yield can be had, at room temperature, when pressure is 0.3-0.5MPa without the need to high pressure, single film water production rate can reach more than 1.2 tons, use rear product water demineralizing rate to be generally 10-50%, the rate of recovery can reach more than 80%, and its outlet effect is much larger than common ultra-filtration membrane water outlet.
Embodiment
Embodiment one,
Choose two kinds of discarded films (film that water production rate is low and oxidized film) of equivalent, be handled as follows:
Step one, alternately cleaned for several times by the hydrochloric acid that the clorox of working concentration 1% and concentration are 1% by film low for water production rate, till the water production rate that this film can recover, now the ratio of desalinization of film is generally 50%;
Step 2, the film being only 50% with the ratio of desalinization that oxidized rear water production rate rises are stand-by after mixing.
Embodiment two,
Choose two kinds of discarded films (film that water production rate is low and oxidized film) of equivalent, be handled as follows:
Step one, alternately cleaned for several times by the nitric acid that the clorox/sodium chlorate (50/50) of working concentration 5% and concentration are 2% by film low for water production rate, till the water production rate that this film can recover, now the ratio of desalinization of film is generally 20%;
Step 2, the film being only 10% with the ratio of desalinization that oxidized rear water production rate rises are stand-by after mixing.
Embodiment three,
Choose two kinds of discarded films (film that water production rate is low and oxidized film) of equivalent, be handled as follows:
Step one, by film low for water production rate by the cleaning of the clorox of working concentration 5% for several times, till the water production rate that this film can recover, now the ratio of desalinization of film is generally 80%;
Step 2, the film being only 30% with the ratio of desalinization that oxidized rear water production rate rises are stand-by after mixing.
Embodiment four,
Choose two kinds of discarded films (film that water production rate is low and oxidized film) of equivalent, be handled as follows:
Step one, by film low for water production rate by the cleaning of the hypochlorous acid of working concentration 3% for several times, till the water production rate that this film can recover, now the ratio of desalinization of film is generally 60%;
Step 2, the film being only 40% with the ratio of desalinization that oxidized rear water production rate rises are stand-by after mixing.
Refer to herein it is noted that the ratio of mixture of above-mentioned two kinds of useless films can also be 1:0.1,1:2,1:3,1:5,1:8,1:10 mixture ratio that wait or not according to using needs.
The acid solution used in the process of above-mentioned alkali cleaning and pickling or alkali lye also can be selected from the composition of one or more in hydrochloric acid, sulfuric acid, nitric acid, hypochlorous acid acid, liquid chlorine, dioxide peroxide, Peracetic Acid, bromochlorohydantoin, trichloroisocyanuric acid respectively; Or clorox, sodium chlorate, the composition of one or more in Surchlor GR 60.
This product can not make ultra-filtration membrane to use, the comparatively high yield water yield can be had without the need to high pressure, at room temperature, when pressure is 0.3-0.5MPa, single film water production rate can reach more than 1.2 tons, use rear product water demineralizing rate to be generally 10-50%, the rate of recovery can reach more than 80%, and its outlet effect is much larger than ultra-filtration membrane water outlet.
Claims (10)
1. be heavily polluted a reverse osmosis membrane reuse method, it is characterized in that: the low film of water production rate after acid at least one times and/or alkaline purification at least one times, reuse after mixing with oxidized film;
Wherein, the film that described water production rate is low is 1:0.1-10 with the mixing quality ratio of oxidized film.
2. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
The film that described water production rate is low is by after organism, bacterium, oils thing, dirty thing severe contamination, produce the water water yield lower than 50% film.
3. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Described oxidized film is the effect by oxidizing substance in feed water by reverse osmosis, and film body is oxidized, and water production rate is higher than 150%, and film ratio of desalinization is the film of 10-50%.
4. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Acid solution selected in described acid-treated process is oxidizing acid.
5. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Described acid is selected from the composition of one or more in hydrochloric acid, sulfuric acid, nitric acid, hypochlorous acid acid, liquid chlorine, dioxide peroxide, Peracetic Acid, bromochlorohydantoin, trichloroisocyanuric acid.
6. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Alkali lye selected in the process of described alkaline purification is alkaline oxidiser.
7. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Described alkali is selected from the composition of one or more in clorox, sodium chlorate, Surchlor GR 60.
8. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
The mass percent concentration of described bronsted lowry acids and bases bronsted lowry is 1-5%.
9. one as claimed in claim 1 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
The aquatic products amount of described film after acid at least one times and/or alkaline purification is at least one times greater than 150%, and its ratio of desalinization is 20-80%.
10. the one as described in as arbitrary in claim 1-9 is heavily polluted reverse osmosis membrane reuse method, it is characterized in that:
Film through reuse method process can be used as ultra-filtration membrane to use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030962.2A CN105439247A (en) | 2015-12-31 | 2015-12-31 | Recycling method for severely contaminated RO (reverse osmosis) membranes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030962.2A CN105439247A (en) | 2015-12-31 | 2015-12-31 | Recycling method for severely contaminated RO (reverse osmosis) membranes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105439247A true CN105439247A (en) | 2016-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511030962.2A Withdrawn CN105439247A (en) | 2015-12-31 | 2015-12-31 | Recycling method for severely contaminated RO (reverse osmosis) membranes |
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| Country | Link |
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| CN (1) | CN105439247A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107754612A (en) * | 2016-08-16 | 2018-03-06 | 贵阳时代沃顿科技有限公司 | A kind of cleaning agent of reverse-osmosis membrane element cleaning to for concentrating tea and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004314005A (en) * | 2003-04-18 | 2004-11-11 | Kobelco Eco-Solutions Co Ltd | Cleaning method of sludge polluted with organic halogen compound, and its apparatus |
| CN102059056A (en) * | 2010-12-01 | 2011-05-18 | 浙江理工大学 | Nanofiltration reproduction method of waste reverse osmosis membrane element |
-
2015
- 2015-12-31 CN CN201511030962.2A patent/CN105439247A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004314005A (en) * | 2003-04-18 | 2004-11-11 | Kobelco Eco-Solutions Co Ltd | Cleaning method of sludge polluted with organic halogen compound, and its apparatus |
| CN102059056A (en) * | 2010-12-01 | 2011-05-18 | 浙江理工大学 | Nanofiltration reproduction method of waste reverse osmosis membrane element |
Non-Patent Citations (1)
| Title |
|---|
| 靖大为等: "氧化改性反渗透膜元件的性能及应用", 《工业水处理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107754612A (en) * | 2016-08-16 | 2018-03-06 | 贵阳时代沃顿科技有限公司 | A kind of cleaning agent of reverse-osmosis membrane element cleaning to for concentrating tea and preparation method thereof |
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Application publication date: 20160330 |