CN113012843A - System and method for treating radioactive wastewater - Google Patents
System and method for treating radioactive wastewater Download PDFInfo
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- CN113012843A CN113012843A CN202110265268.8A CN202110265268A CN113012843A CN 113012843 A CN113012843 A CN 113012843A CN 202110265268 A CN202110265268 A CN 202110265268A CN 113012843 A CN113012843 A CN 113012843A
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- 239000002354 radioactive wastewater Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 137
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000000919 ceramic Substances 0.000 claims abstract description 41
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000012466 permeate Substances 0.000 claims description 18
- 239000012141 concentrate Substances 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 150000003839 salts Chemical class 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 24
- 239000000706 filtrate Substances 0.000 description 15
- 239000012535 impurity Substances 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- -1 Polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002925 low-level radioactive waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000005258 radioactive decay Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/20—Disposal of liquid waste
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
本发明提供了一种处理放射性废水的系统和方法，涉及水处理技术领域。本发明提供的系统，包括精密过滤器(2)、陶瓷超滤膜(3)和高压碟管式DTRO膜柱(4)。本发明提供的系统精密过滤器(2)、陶瓷超滤膜(3)和高压碟管式DTRO膜柱(4)联用，对放射性废水具有高的分离精度和高处理效率，能够实现放射性废水的高度浓缩，污染物和盐的脱除率在95％以上，经处理后的水符合排放标准，能够直接排放到环境中或者是用于各种生产工艺中。而且，本发明提供的系统，装置简单，耗能低，系统占地面积小，放射性废水的处理成本低，系统清洗方便。
The invention provides a system and method for treating radioactive waste water, and relates to the technical field of water treatment. The system provided by the present invention includes a precision filter (2), a ceramic ultrafiltration membrane (3) and a high-pressure disc tube type DTRO membrane column (4). The system precision filter (2), the ceramic ultrafiltration membrane (3) and the high-pressure disc tube type DTRO membrane column (4) provided by the present invention are used in combination, have high separation precision and high treatment efficiency for radioactive wastewater, and can realize radioactive wastewater It is highly concentrated, and the removal rate of pollutants and salts is above 95%. The treated water meets the discharge standard and can be directly discharged into the environment or used in various production processes. Moreover, the system provided by the present invention has the advantages of simple device, low energy consumption, small area of the system, low treatment cost of radioactive waste water, and convenient cleaning of the system.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a system and a method for treating radioactive wastewater.
Background
The radioactive wastewater refers to wastewater discharged from nuclear fuel pretreatment and post-treatment, nuclear power plants, research using radioisotopes, hospitals, factories, and the like. These waste waters contain radioactive elements or fission products, which are deposited in organs after entering human or animal bodies, seriously damaging the health of human and animal bodies and must be strictly treated before being discharged.
Radionuclides do not change their inherent radioactive decay characteristics by any water treatment method, which generally follows two basic principles: (1) radioactive waste water is discharged into bodies of water (e.g. oceans, lakes, rivers, groundwater) to harmless levels by dilution and diffusion, however this principle is mainly applicable to the treatment of very low levels of radioactive waste water. (2) The radioactive waste water and its concentrated product are isolated from the living environment of human body for a long time, and let it decay naturally, so that it is applicable to high-, medium-and low-level radioactive waste water. The common method for concentrating the radioactive wastewater is an evaporation method, and most of radioactive nuclides are left in residual liquid after the radioactive wastewater is treated by the evaporation method, so that the efficiency is higher. The mist end generated in the evaporation process enters the condensate along with the steam to enhance the radioactivity in the condensate, a mist end separation device such as a cyclone separator, a glass fiber filled tower, a wire mesh separator, a sieve plate tower, a bubble cap tower and the like needs to be arranged in the treatment device, in addition, the potential risks such as foaming, corrosion, scaling, explosion and the like and the radiation protection problem need to be considered, the device is complex, a large amount of evaporation heat energy needs to be consumed, and the treatment cost is high.
Disclosure of Invention
In view of this, the present invention provides a system and a method for treating radioactive wastewater, the system provided by the present invention can intercept the pollutant elements of the radioactive wastewater, and the treated water meets the discharge standard.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a system for treating radioactive wastewater, which comprises a precision filter 2;
a ceramic ultrafiltration membrane 3 with a water inlet communicated with the water outlet of the precision filter 2;
and the water inlet of the high-pressure disc tube type DTRO membrane column 4 is communicated with the water outlet of the ceramic ultrafiltration membrane 3.
Preferably, the precision filter 2 is 5-10 μm.
Preferably, the ceramic ultrafiltration membrane 3 is a delayer DCB100 membrane.
Preferably, the high-pressure disc tube type DTRO membrane column 4 is a Delnamel DO-02 membrane column.
Preferably, the system also comprises a raw water tank 1, a water production tank 5 and a concentrated solution tank 6;
the water outlet of the raw water tank 1 is communicated with the water inlet of the precision filter 2;
the water inlet of the water production tank 5 is communicated with the membrane permeation liquid outlet of the high-pressure disc tube type DTRO membrane column 4;
and the water inlet of the concentrated solution tank 6 is communicated with the membrane concentrated solution outlet of the high-pressure disc tube type DTRO membrane column 4.
Preferably, a first booster pump 7-1 is arranged on a pipeline for communicating the raw water tank 1 and the precision filter 2;
and a second booster pump 7-2 is arranged on a pipeline communicated with the precision filter 2 and the ceramic ultrafiltration membrane 3.
Preferably, the first booster pump 7-1 and the second booster pump 7-2 have a head of 30 to 40m independently.
Preferably, the concentrated solution outlet of the ceramic ultrafiltration membrane 3 is communicated with the raw water tank 1.
Preferably, a high-pressure pump 7-3 and a circulating pump 7-4 are arranged on a pipeline communicated with the ceramic ultrafiltration membrane 3 and the high-pressure disc tube type DTRO membrane column 4, and the high-pressure pump 7-3 is communicated with the circulating pump 7-4 through the pipeline;
the membrane concentrated solution outlet of the high-pressure disc tube type DTRO membrane column 4 is communicated with a pipeline between the high-pressure pump 7-3 and the circulating pump 7-4;
and a regulating valve 8 is arranged on a pipeline for communicating the high-pressure disc tube type DTRO membrane column 4 with the concentrated solution tank 6.
The invention also provides a method for treating radioactive wastewater by adopting the system in the technical scheme, which comprises the following steps:
the radioactive wastewater is primarily filtered through a precision filter 2, secondarily filtered through a ceramic ultrafiltration membrane 3, and then intercepted through a high-pressure disc tube type DTRO membrane column 4 to obtain membrane permeate; the membrane permeate meets the discharge standards.
The invention provides a system for treating radioactive wastewater, which comprises a precision filter 2; a ceramic ultrafiltration membrane 3 with a water inlet communicated with the water outlet of the precision filter 2; and the water inlet of the high-pressure disc tube type DTRO membrane column 4 is communicated with the water outlet of the ceramic ultrafiltration membrane 3. The system provided by the invention has high separation precision and high treatment efficiency on radioactive wastewater, wherein the precision filter 2 can enable the water quality to meet the condition of entering the ceramic ultrafiltration membrane 3 by using pollutants such as particle suspended matters, impurities and the like in the radioactive wastewater; the ceramic ultrafiltration membrane 3 can remove residual micro impurities in the filtered water through the precision filter 2; the high-pressure disc tube type DTRO membrane column 4 only allows water molecules to permeate through, and other impurities are all trapped. The precise filter 2, the ceramic ultrafiltration membrane 3 and the high-pressure disc tube type DTRO membrane column 4 are combined, so that the radioactive wastewater can be highly concentrated, the removal rate of pollutants and salt is over 95 percent, the treated water meets the discharge standard, and the treated water can be directly discharged into the environment or used in various production processes. Moreover, the system provided by the invention has the advantages of simple device, low energy consumption, small system floor area, low treatment cost of radioactive wastewater and convenient system cleaning.
The invention provides a method for treating radioactive wastewater by adopting the system of the technical scheme, which comprises the following steps: the radioactive wastewater is primarily filtered through a precision filter 2, secondarily filtered through a ceramic ultrafiltration membrane 3, and then intercepted through a high-pressure disc tube type DTRO membrane column 4 to obtain membrane permeate; the membrane permeate meets the discharge standards. According to the method provided by the invention, after the radioactive wastewater is sequentially treated by the precision filter 2, the ceramic ultrafiltration membrane 3 and the high-pressure disc tube type DTRO membrane column 4, the removal rate of pollutants and salt in the radioactive wastewater is over 95 percent, and the treated membrane permeate meets the discharge standard and can be directly discharged into the environment or used in various production processes; moreover, the invention has simple operation, low energy consumption and low cost,
drawings
Fig. 1 is a schematic diagram of a system, in which 1 is a raw water tank, 2 is a precision filter, 3 is a ceramic ultrafiltration membrane, 4 is a high-pressure disc tube type DTRO membrane column, 5 is a water production tank, 6 is a concentrate tank, 7-1 is a first booster pump, 7-2 is a second booster pump, 7-3 is a high-pressure pump, 7-4 is a circulating pump, and 8 is a regulating valve.
Detailed Description
The invention provides a system for treating radioactive wastewater, which comprises a precision filter 2;
a ceramic ultrafiltration membrane 3 with a water inlet communicated with the water outlet of the precision filter 2;
and the water inlet of the high-pressure disc tube type DTRO membrane column 4 is communicated with the water outlet of the ceramic ultrafiltration membrane 3.
In an embodiment of the invention, the system preferably further comprises a raw water tank 1. In the present invention, the raw water tank 1 serves to equalize the quality and quantity of radioactive wastewater. In an embodiment of the present invention, the raw water tank is preferably made of Polyethylene (PE) or polypropylene (PP).
The system provided by the invention comprises a precision filter 2; and the water inlet of the precision filter 2 is communicated with the water outlet of the raw water tank 1. In the embodiment of the invention, the filtration precision of the precision filter 2 is preferably 5-10 μm, more preferably 6-9 μm, and even more preferably 7-8 μm. In the invention, the precision filter 2 is used as a protective barrier for radioactive wastewater to enter the ceramic ultrafiltration membrane 3, and is used for primarily filtering the radioactive wastewater to remove pollutants such as particle suspended matters in the radioactive wastewater, so that the water quality meets the condition of entering the ceramic ultrafiltration membrane 3.
In the embodiment of the invention, a first booster pump 7-1 is arranged on a pipeline for communicating the raw water tank 1 and the precision filter 2, a water inlet of the first booster pump 7-1 is communicated with a water outlet of the raw water tank 1, and a water outlet of the first booster pump 7-1 is communicated with a water inlet of the precision filter 2. In the embodiment of the invention, the lift of the first booster pump 7-1 is preferably 30-40 m, more preferably 32-38 m, and even more preferably 35-36 m. In the present invention, the first pressurizing pump 7-1 serves to pressurize the radioactive wastewater.
The system provided by the invention also comprises a ceramic ultrafiltration membrane 3, wherein a water inlet of the ceramic ultrafiltration membrane is communicated with a water outlet of the precision filter 2. In the embodiment of the invention, the concentrated solution outlet of the ceramic ultrafiltration membrane 3 is communicated with the raw water tank 1. In the embodiment of the present invention, the ceramic ultrafiltration membrane 3 is preferably a delamel DCB100 membrane, and the delamel DCB100 membrane is a multi-layer product formed by firing alumina, titania, zirconia and silica materials at a high temperature and having a support layer, a transition layer and a separation layer. In the present invention, the ceramic ultrafiltration membrane 3 functions to secondarily filter the primary filtrate obtained by the treatment of the ultrafilter 2 to remove remaining fine impurities in the primary filtrate.
In the embodiment of the invention, a second booster pump 7-2 is arranged on a pipeline for communicating the precision filter 2 with the ceramic ultrafiltration membrane 3, a water inlet of the second booster pump 7-2 is communicated with a water outlet of the precision filter 2, and a water outlet of the second booster pump 7-2 is communicated with a water inlet of the ceramic ultrafiltration membrane 3. In the embodiment of the invention, the lift of the second booster pump 7-2 is preferably 30-40 m, more preferably 32-38 m, and even more preferably 35-36 m. In the present invention, the second pressurizing pump 7-2 serves to pressurize the radioactive wastewater.
The system provided by the invention comprises a high-pressure disc tube type DTRO membrane column 4 with a water inlet communicated with a water outlet of the ceramic ultrafiltration membrane 3. In the embodiment of the invention, the high-pressure disc tube type DTRO membrane column 4 is preferably a Delamel DO-02 membrane column, and the Delamel DO-02 membrane column is a membrane column formed by connecting a sealing ring, a flow guide disc, a membrane, a sealing ring and a central pull rod together. In the embodiment of the invention, the filtration precision of the high-pressure disc tube type DTRO membrane column 4 is preferably 0.5-10 nm, and more preferably 1-5 nm. In the present invention, the high pressure disc tube type DTRO membrane column 4 is provided with a membrane concentrate outlet and a membrane permeate outlet. In the invention, the high-pressure disc tube type DTRO membrane column 4 is a high-pressure system, can still normally work under 160bar to realize high-power concentration of radioactive wastewater, and meanwhile, the high filtering precision of the disc tube type reverse osmosis membrane of the high-pressure disc tube type DTRO membrane column 4 is realized, water molecules can pass through the reverse osmosis membrane, while inorganic salt, heavy metal ions, radioactive nuclide, organic matters, colloid, bacteria, viruses and other impurities can not pass through the reverse osmosis membrane, so that the impurities such as the organic matters, salt and the like in water can be intercepted, the desalination rate can reach more than 95%, and the membrane permeation liquid can be directly discharged or reused in a production process according with the discharge standard, thereby realizing the cyclic utilization of water resources.
In the embodiment of the invention, a high-pressure pump 7-3 is arranged on a pipeline for communicating the ceramic ultrafiltration membrane 3 with the high-pressure disc tube type DTRO membrane column 4, and a water inlet of the high-pressure pump 7-3 is communicated with a water outlet of the ceramic ultrafiltration membrane 3. In the present invention, the high-pressure pump 7-3 serves to pressurize the radioactive waste water.
In the embodiment of the invention, a circulating pump 7-4 is arranged on a pipeline for communicating the high-pressure pump 7-3 with the high-pressure disc tube type DTRO membrane column 4, a water inlet of the circulating pump 7-4 is communicated with a water outlet of the high-pressure pump 7-3, and a water outlet of the circulating pump 7-4 is communicated with a water inlet of the high-pressure disc tube type DTRO membrane column 4; one end of a membrane concentrated solution outlet of the high-pressure disc tube type DTRO membrane column 4 is communicated with a pipeline between the high-pressure pump 7-3 and the circulating pump 7-4, and the other end of the membrane concentrated solution outlet is communicated with the concentrated solution tank 7-6. In the present invention, the circulation pump 7-4 serves to supplement the amount of water required for the high pressure disc tube type DTRO membrane column 4.
In the embodiment of the invention, the system further comprises a water production tank 5, the water inlet of which is communicated with the membrane permeate outlet of the high-pressure disc tube type DTRO membrane column 4, and the water production tank 5 is used for storing the membrane permeate treated by the high-pressure disc tube type DTRO membrane column 4. In the invention, the membrane permeate in the water production tank 5 meets the discharge standard, and is directly discharged into the environment or used for various water-requiring production processes, so that the cyclic utilization of water resources is realized.
In the embodiment of the invention, the system further comprises a concentrate tank 6 communicated with the membrane concentrate outlet of the high-pressure disc tube type DTRO membrane column 4, and a regulating valve 8 is arranged on a pipeline of the high-pressure disc tube type DTRO membrane column 4 communicated with the concentrate tank 6. In the present invention, the concentrate tank 6 serves to store the concentrate treated by the high pressure disc tube type DTRO membrane column 4. The method of treating the concentrate in the concentrate tank 6 is not particularly limited in the present invention, and a method of treating the concentrate known to those skilled in the art may be used.
The invention provides a method for treating radioactive wastewater by adopting the system of the technical scheme, which comprises the following steps:
the radioactive wastewater is primarily filtered through a precision filter 2, secondarily filtered through a ceramic ultrafiltration membrane 3, and then intercepted through a high-pressure disc tube type DTRO membrane column 4 to obtain membrane permeate; the membrane permeate meets the discharge standards.
In the invention, the secondary filtration is carried out to obtain secondary filtrate and concentrated solution, the secondary filtrate enters a high-pressure disc tube type DTRO membrane column 4 for interception, and the concentrated solution preferably flows back to the raw water tank 1 through a pipeline.
In the invention, the membrane concentrated solution obtained by the excellent interception is preferably refluxed to the high-pressure disc-tube type DTRO membrane column 4 through a circulating pump 7-4 to be treated again or enters a concentrated solution tank 6 to be stored.
The following describes a specific method for treating radioactive wastewater by using the system provided by the invention with reference to fig. 1, which comprises the following steps: pressurizing the radioactive wastewater entering the raw water tank 1 by a first booster pump 7-1, and then conveying the pressurized radioactive wastewater to a precision filter 2 for primary filtration to obtain primary filtrate; after the primary filtrate is pressurized, a second booster pump 7-2 conveys the primary filtrate to a ceramic ultrafiltration membrane 3 for secondary filtration to obtain secondary filtrate and concentrated solution, and the concentrated solution flows back to the raw water tank 1 through a pipeline; pressurizing the secondary filtrate by a high-pressure pump 7-3, and conveying the secondary filtrate to a high-pressure disc tube type DTRO membrane column 4 by a circulating pump 7-4 for interception to obtain membrane permeate and membrane concentrate; the membrane permeate is stored in a water production tank 5, meets the discharge standard, and is directly discharged into the environment or used for various water-requiring production processes; the membrane concentrated solution is conveyed to a high-pressure disc tube type DTRO membrane column 4 through a pipeline and a circulating pump 7-4 for interception or is stored in a concentrated solution tank 6.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Pressurizing the radioactive wastewater entering the raw water tank 1 by a first booster pump 7-1, and then conveying the pressurized radioactive wastewater to a precision filter 2 for primary filtration to obtain primary filtrate;
conveying the primary filtrate to a delayer DCB100 ceramic ultrafiltration membrane 3 by a second booster pump 7-2 after pressurization to perform secondary filtration to obtain secondary filtrate and concentrated solution, and refluxing the concentrated solution to the raw water tank 1 through a pipeline;
pressurizing the secondary filtrate by a high-pressure pump 7-3, and conveying the secondary filtrate to a Delangmeil MO-02 membrane column 4 by a circulating pump 7-4 for interception to obtain membrane permeate and membrane concentrate; the content of impurities in the membrane permeation liquid is less than 5 percent, and the membrane permeation liquid meets the discharge standard; the membrane permeate is stored in a water production tank 5 and directly discharged into the environment or used for various water-requiring production processes; the membrane concentrated solution is conveyed to a Delangmeil MO-02 membrane column 4 through a pipeline and a circulating pump 7-4 for interception or is stored in a concentrated solution tank 6;
wherein the filtration precision of the precision filter 2 is 5 μm, the lift of the first booster pump 7-1 is 32m, and the lift of the second booster pump 7-2 is 25 m.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A system for treating radioactive waste water, characterized by comprising a precision filter (2);
the water inlet of the ceramic ultrafiltration membrane (3) is communicated with the water outlet of the precision filter (2);
and the water inlet of the high-pressure disc tube type DTRO membrane column (4) is communicated with the water outlet of the ceramic ultrafiltration membrane (3).
2. The system according to claim 1, wherein the precision filter (2) has a filtration precision of 5-10 μm.
3. The system according to claim 1, wherein the ceramic ultrafiltration membrane (3) is a delaunay mell DCB100 membrane.
4. The system of claim 1, wherein the high pressure disc tube DTRO membrane column (4) is a delamel DO-02 membrane column.
5. The system according to any one of claims 1 to 4, further comprising a raw water tank (1), a water production tank (5) and a concentrate tank (6);
the water outlet of the raw water tank (1) is communicated with the water inlet of the precision filter (2);
the water inlet of the water production tank (5) is communicated with the membrane permeation liquid outlet of the high-pressure disc tube type DTRO membrane column (4);
and the water inlet of the concentrated solution box (6) is communicated with the membrane concentrated solution outlet of the high-pressure disc tube type DTRO membrane column (4).
6. The system according to claim 1 or 2, characterized in that a first booster pump (7-1) is arranged on a pipeline for communicating the raw water tank (1) and the precision filter (2);
and a second booster pump (7-2) is arranged on a pipeline communicated with the precision filter (2) and the ceramic ultrafiltration membrane (3).
7. A system according to claim 6, wherein the first booster pump (7-1) and the second booster pump (7-2) independently have a head of 30-40 m.
8. The system according to claim 5, characterized in that the concentrate outlet of the ceramic ultrafiltration membrane (3) is in communication with the raw water tank (1).
9. The system according to claim 1, 3 or 4, characterized in that a high-pressure pump (7-3) and a circulating pump (7-4) are arranged on a pipeline for communicating the ceramic ultrafiltration membrane (3) with the high-pressure disc tube type DTRO membrane column (4), and the high-pressure pump (7-3) and the circulating pump (7-4) are communicated through the pipeline;
the membrane concentrated solution outlet of the high-pressure disc tube type DTRO membrane column (4) is communicated with a pipeline between the high-pressure pump (7-3) and the circulating pump (7-4);
and a regulating valve (8) is arranged on a pipeline communicated with the high-pressure disc tube type DTRO membrane column (4) and the concentrated solution tank (6).
10. A method for treating radioactive wastewater using the system of any one of claims 1 to 9, comprising the steps of:
the radioactive wastewater is primarily filtered through a precision filter (2), secondarily filtered through a ceramic ultrafiltration membrane (3), and then intercepted through a high-pressure disc tube type DTRO membrane column (4) to obtain membrane permeate; the membrane permeate meets the discharge standards.
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