CN103762004B - A kind of method and system concentrating radioactive wastewater - Google Patents
A kind of method and system concentrating radioactive wastewater Download PDFInfo
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- CN103762004B CN103762004B CN201410028695.4A CN201410028695A CN103762004B CN 103762004 B CN103762004 B CN 103762004B CN 201410028695 A CN201410028695 A CN 201410028695A CN 103762004 B CN103762004 B CN 103762004B
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Abstract
The invention discloses a kind of method concentrating radioactive wastewater, the method comprises the steps: that radioactive wastewater imports reverse osmosis concentration unit carries out reverse osmosis initial concentration, and the reverse osmosis concentrated liquid having retained radioelement imports thickener; Concentrated solution in thickener is imported Membrane Materials unit and carries out degree of depth concentration; The conductance probe head for measuring concentrated solution electrical conductivity it is provided with in thickener, when the electrical conductivity in thickener is higher than the conductance threshold value set, stop importing reverse osmosis concentrated liquid described thickener, and the membrane distillation concentration of stopper film distillation and concentration unit, after by thickener concentrated solution derive carry out cured. Compared with prior art, the Novel radioactive contact scar Waste water concentrating method that the present invention adopts reverse osmosis+Membrane Materials to be core, the degree of depth concentration of reverse osmosis concentrated liquid can be realized, reduce the volume of radioactive liquid waste further, its cycles of concentration can reach the level similar with evaporation technology, and energy consumption is only the 30-50% of evaporation technology.
Description
Technical field
The present invention relates to a kind of sewage disposal technology, the special method for concentration relating to nuclear industry radioactive wastewater; It addition, the invention further relates to a kind of system using the method that radioactive wastewater is processed.
Background technology
The main target that radioactive wastewater processes is to reduce the amount of radwaste as far as possible. No matter take which kind of processing method, substantially by the radionuclide enrichment method liquid medium to minimum volume or solid dielectric, and make most part liquid solve control after meeting related request. The dense water of the liquid medium such as membrane process of enrichment method radionuclide, the steaming residual liquid of evaporation technology. Solid dielectric is ion exchange resin such as. These materials eventually become radwaste, carry out long-term geological reservoir. The cardinal principle that radioactive wastewater processes is under reasonable conditions, makes liquid medium or the solid dielectric small quantization as far as possible of enrichment method radionuclide.
Wherein, the traditional handicraft of radioactive wastewater concentration technology is: evaporation+ion exchanges. Namely radioactive wastewater is after double flash evaporation processes, and condensed fluid enters ion exchange resin bed and carries out precision processing, meets environmental emission requirement; The enrichment method steaming residual liquid of a large amount of nucleic, after immobilization processes, carries out long-term geological reservoir; The enrichment method ion exchange resin of a large amount of nucleic, after immobilization processes, carries out long-term geological reservoir. The advantage of traditional handicraft is in that: technology maturation, and dirt-removing power is strong. Have drawbacks in that energy consumption is high; Radioactive spent resin amount is big; Equipment is huge, and investment height, the problems such as operating condition is poor, corrosion and scaling are serious.
Rising of membrane technology provides new selection for radioactive wastewater process. Hyperfiltration technique is difficult to remove deliquescent radionuclide ion, but the fine suspension, colloidal substance and the part larger molecular organics that exist in water can be removed, thus remove and carried secretly by colloid or particulate matter or form the radionuclide ion of complex with larger molecular organics.Reverse osmosis, nanofiltration can remove the radionuclide ion of ionic state, but influent quality has higher requirement. Under normal circumstances, according to the water quality characteristic of radioactive wastewater, pointed film integrated system need to be designed.
Summary of the invention
For solving the problems referred to above of prior art, the primary and foremost purpose of the present invention is in that to provide a kind of method simply and efficiently concentrating radioactive wastewater, and secondary objective is in that to provide a kind of system using the method that radioactive wastewater is concentrated.
For achieving the above object, a kind of method concentrating radioactive wastewater of the present invention comprises the steps:
Step one: radioactive wastewater is imported reverse osmosis concentration unit and carries out preliminary reverse osmosis concentration, the concentrated solution having retained radioelement imports thickener, and the water purification penetrated meets discharge after environmental emission requires;
Step 2: the concentrated solution in described thickener is imported Membrane Materials unit and carries out further membrane distillation concentration, defeated after the steam that goes out through membrane filtration is condensed returning to described reverse osmosis concentration unit and again carry out reverse osmosis concentration, the debris that do not distill is defeated returns to described thickener;
Step 3: measure the electrical conductivity in thickener in real time, when this electrical conductivity is higher than the conductance threshold value set, stop concentrated solution produced by reverse osmosis concentration unit described in step one is imported described thickener, and stop the membrane distillation concentration of described Membrane Materials unit, the concentrated solution in described thickener is derived and does subsequent cure and process.
Further, described reverse osmosis concentration unit adopts pressure-actuated membranous system; Described membrane distillation concentration unit adopts the membranous system that temperature difference drives, and heats and keep design temperature by the liquid in described thickener, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam condensation after film is derived.
Further, monitor the liquid level in described thickener in real time, when liquid is higher than the most high workload liquid level set in thickener, suspends the concentrated solution concentrated by described reverse osmosis concentration unit and input in described thickener until liquid is down to the minimum work liquid level of setting in thickener; When liquid is lower than described minimum work liquid level in described thickener, suspend described membrane distillation concentration unit, until the liquid level in described thickener rises to most high workload liquid level.
Further, before described radioactive wastewater imports described reverse osmosis concentration unit, the technology such as microfiltration, ultrafiltration or sand filtration are adopted to remove the impurity such as float, colloid.
Further, being provided with raw material tank before described reverse osmosis concentration unit, described radioactive wastewater to be concentrated first imports in described raw material tank, then passes through the delivery pump described reverse osmosis concentration unit of input and concentrates.
Further, described reverse osmosis concentration unit at least includes two-pass RO system; The liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, imports in described thickener; The liquid that other counter-infiltration systems at different levels retain is transmitted back to described raw material tank.
Further, in described thickener, temperature of liquid controls more than 50 degree, and described Membrane Materials unit is made up of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m3/h��
Further, in described thickener radioactivity total activity level less than 10E+9Bq/L.
Further, before and after starting to concentrate radioactive wastewater, water purification produced by described reverse osmosis concentration unit and described membrane distillation concentration unit on-radiation water or step one being carried out on-line rinsing, during flushing, running parameter is constant.
A kind of system concentrating radioactive wastewater includes:
Radioactive wastewater to be concentrated is carried out the reverse osmosis concentration unit of reverse osmosis concentration;
It is connected with described reverse osmosis concentration unit, and for receiving and the thickener of concentrated solution produced by accommodating described reverse osmosis concentration unit;
It is connected with described thickener, and concentrated solution in thickener is carried out the membrane distillation concentration unit of membrane distillation concentration;
The debris that described membrane distillation concentration unit does not distill is transmitted back to described thickener by the road, defeated after the steam that filters out through Membrane Materials is condensed return to described reverse osmosis concentration unit and again carries out reverse osmosis concentration;
It is provided with the conductance probe head for measuring concentrated solution electrical conductivity in described thickener, when the electrical conductivity in thickener is higher than the conductance threshold value set, stops importing reverse osmosis concentrated liquid described thickener, and stop the membrane distillation concentration of described Membrane Materials unit.
Further, the system of described concentration radioactive wastewater also includes the raw material tank for holding radioactive wastewater to be concentrated.
Further, the system of described concentration radioactive wastewater also includes for radioactive wastewater to be concentrated adopts the technology such as microfiltration, ultrafiltration or sand filtration remove the pre-processing module of the impurity such as float, colloid; Described pre-processing module is connected with described raw material tank, and radioactive wastewater after treatment flows into described raw material tank by the road; Or described pre-processing module is arranged between described raw material tank and described reverse osmosis concentration unit, the radioactive wastewater in described raw material tank, after described pre-processing module processes, imports described reverse osmosis concentration unit by the road.
Further, described reverse osmosis concentration unit adopts pressure-actuated membranous system; Described membrane distillation concentration unit adopts the membranous system that temperature difference drives, and heats and keep design temperature by the liquid in described thickener, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam condensation after film is derived.
Further, most high workload liquid level, minimum working solution bit switch are set in described thickener, in thickener, liquid is higher than described most high workload liquid level, suspends and is inputted by the concentrated solution of first order reverse osmosis concentration in described reverse osmosis concentration unit in described thickener until liquid is down to described minimum work liquid level in thickener; When liquid is lower than described minimum work liquid level in described thickener, suspend described membrane distillation concentration unit, until the liquid level in described thickener rises to most high workload liquid level.
Further, described reverse osmosis concentration unit at least includes two-pass RO system; The liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, imports in described thickener; The liquid that other counter-infiltration systems at different levels retain is transmitted back to described raw material tank by the road.
Further, described Membrane Materials unit is made up of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m3/h��
The Novel radioactive Waste water concentrating method that it is core with reverse osmosis+Membrane Materials that this patent proposes. Wherein, reverse osmosis assume responsibility for radioactive wastewater primary concentrating function, the fresh water that reverse osmosis produces meets after related request can environmental emission, the concentrated solution that reverse osmosis produces circulates through membrane component, vapour pressure deficit inside and outside membrane module is utilized to be derived by the steam produced, derive steam condensation and form Membrane Materials fresh water, carry out degree of depth concentration.
The System and method for of the concentration radioactive wastewater that this patent proposes, novelty is in that:
1) than in the world through frequently with reverse osmosis, it is possible to reduce further the volume of radioactive liquid waste.Utilize reverse osmosis technology concentration radioactive wastewater, although energy consumption can be reduced, but its cycles of concentration still has bigger gap compared with evaporation technology. The Novel radioactive contact scar Waste water concentrating method adopting reverse osmosis+Membrane Materials to be core, the secondary concentration of reverse osmosis concentrated liquid can be realized, reducing the volume of radioactive liquid waste further, its cycles of concentration can reach the level similar with evaporation technology, and energy consumption is only the 30-50% of evaporation technology.
2) compared with conventional evaporation technology, in equipment size, operability, maintenance and repair etc., there is obvious advantage. Traditional evaporation equipment is bulky, and radiation protection requires height, there is the problems such as corrosion and scaling, and equipment replacement difficulty is big. Simply compact with the Novel radioactive contact scar Waste water concentrating technique that reverse osmosis+Membrane Materials is core, equipment and raw water box, pipeline, valve, measuring instrument, control system etc. that each process procedure relates to can be integrated in Mobile cabinet, realizing quickly moving between different location, after changing job site, energising gets final product normal operation. Built-in system has a style of one's own, and externally only sets water inlet, fresh water outlet mouth and three intake-outlets of concentrated solution outlet, and integrated system has the functions such as auto-flushing, Water free alarming, fault alarm, water quality Real time displaying.
Accompanying drawing explanation
Fig. 1 is the inventive method basic flow sheet;
Fig. 2 is reverse osmosis concentration cellular construction schematic diagram in embodiment 1;
Fig. 3 is the system structure schematic diagram concentrating radioactive wastewater in embodiment 4;
Fig. 4 is the system structure schematic diagram of concentrated reflection waste water in embodiment 5;
Fig. 5 is embodiment 5 reverse osmosis concentration cellular construction schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is illustrated.
Embodiment 1
As it is shown in figure 1, concentration radioactivity level is 7000Bq/L, salinity is the radioactive wastewater method for concentration of 2g/L.
(1) first on-radiation water is adopted to carry out auto-flushing each membrane module during system boot, rear entrance normal operation program.
(2) radioactive wastewater is carried out pre-treatment: the impurity such as the float in radioactive wastewater, colloid are removed in ultrafiltration, the radioactive wastewater after processing is entered raw material tank.
It addition, this operation can also adopt the technology such as microfiltration, sand filtration to remove the impurity such as float, colloid.
(3) radioactive wastewater after pre-treatment being imported reverse osmosis concentration unit and carry out reverse osmosis concentration, the concentrated solution having retained radioelement is imported thickener, the water purification penetrated meets discharge after environmental emission requires; As in figure 2 it is shown, reverse osmosis concentration unit adopts pressure-actuated three grades of counter-infiltration systems, the entrance next stage counter-infiltration system of the water purification that upper level reverse osmosis appears. Wherein first order counter-infiltration system is divided into 3 sections, and counter-infiltration system overall recovery is 75%. Fresh water radioactivity respectively 200Bq/L, 80Bq/L, 30Bq/L of three grades of reverse osmosiss, the fresh water discharge that afterbody counter-infiltration system produces. The liquid salinity that first order counter-infiltration system retains, at about 8g/L, all imports in thickener; The liquid that the second level and third level counter-infiltration system retain is transmitted back to raw material tank.
(4) concentrated solution in thickener being imported Membrane Materials unit and carry out membrane distillation concentration, after the steam that goes out through membrane filtration is condensed, the defeated reverse osmosis concentration unit that returns to carries out reverse osmosis concentration again, and the debris that do not distill is defeated returns to thickener.
The most high and low working solution bit switch is set in thickener. In thickener, liquid is higher than the most high workload liquid level set, and reverse osmosis concentrated liquid returns raw material tank, or closes reverse osmosis concentration unit, until liquid is down to the minimum work liquid level of setting in thickener. In thickener, liquid is lower than minimum work liquid level, suspends membrane distillation concentration unit, until liquid level rises to most high workload liquid level.
Membrane distillation concentration unit adopts the Membrane Materials system that temperature difference drives. In thickener, concentrated solution heating and temperature control is at 50 degree, concentrated solution in groove enters the membrane component of membrane distillation concentration unit, keep film both sides temperature difference, hot side vapour pressure is higher than cold side, steam is derived through condensation after film, returns in the first order of reverse osmosis concentration unit or second level counter-infiltration system and carries out secondary reverse-osmosis treated. The undistilled debris having retained radionuclide returns thickener.
Wherein the membranous system of membrane distillation concentration unit is made up of four membrane modules, and single membrane module circular flow controls6m 3 / h,Four parallel connections, membrane flux is6L/(m 2 .h)��
(5) being provided with the conductance probe head for measuring concentrated solution electrical conductivity in real time in thickener, conductance threshold value set in advance is 30S/m, now in thickener radioactivity total activity level less than 10E+9Bq/L. When the electrical conductivity in thickener is higher than 30S/m, stop importing reverse osmosis concentrated liquid thickener the membrane distillation concentration of stopper film distillation unit.
(6) liquid in thickener is conveyed into through charging pump the standard drum being equipped with a certain amount of cement in advance, after agitated with cement, forms firming body.
The concentrated solution obtained after operation (5) concentrates stored it addition, can also pass through additive method.
(7) operation (2) to (6) is repeated until whole radioactive wastewaters are disposed.
(8), during system shutdown, the fresh water produced by on-radiation water or system carries out on-line rinsing, and running parameter is constant.
After above-mentioned operation processes, the total cycles of concentration of radioactive wastewater reaches more than 100 times.
Embodiment 2
The radioactivity level of the radioactive wastewater handled by the present embodiment is 5000Bq/L, and salinity is the radioactive wastewater of 1g/L.
Enrichment process is substantially the same manner as Example 1, is different in that:
(1) reverse osmosis concentration unit adopts two steps ro membranous system, and first order counter-infiltration system is divided into again 3 sections, and counter-infiltration system overall recovery is 80%. Fresh water radioactivity respectively 150Bq/L, 50Bq/L of two-pass RO system, the fresh water discharge that afterbody membranous system produces. Concentrated solution produced by first order counter-infiltration system fully enters thickener, and salinity is at about 5g/L.
(2) in thickener, concentrated solution heating and temperature control is at 55 degree, and the single membrane module circular flow of membrane distillation concentration unit is 8m 3 / h, four parallel connections, the membrane flux of whole distillation and concentration unit is 8L/ (m 2 .h)��
(3) conductance threshold value 40S/m set in advance, now in thickener radioactivity total activity level less than 10E+9Bq/L.
(4) the total cycles of concentration of radioactive wastewater after last the method process reaches more than 200 times.
Embodiment 3:
The radioactivity level of the radioactive wastewater handled by the present embodiment is 3000Bq/L, and salinity is the radioactive wastewater of 3g/L.
Enrichment process is essentially identical with embodiment, is different in that:
(1) reverse osmosis concentration unit adopts three grades of reverse osmosis membrane systems, and first order counter-infiltration system is divided into again 3 sections, and counter-infiltration system overall recovery is 70%.Fresh water radioactivity respectively 100Bq/L, 50Bq/L, 10Bq/L of three grades of reverse osmosiss, the fresh water discharge that afterbody membranous system produces. Concentrated solution produced by first order counter-infiltration system fully enters thickener, and salinity is at about 9g/L.
(2) in thickener, concentrated solution heating and temperature control is at 60 degree, and the single membrane module circular flow of membrane distillation concentration unit is 4m 3 / h, the membrane flux of distillation and concentration unit is 4L/ (m 2 .h)��
(3) conductance threshold value 50S/m set in advance, now in thickener radioactivity total activity level less than 10E+9Bq/L.
(4) the total cycles of concentration of radioactive wastewater after last the method process reaches about 100 times.
Embodiment 4:
As it is shown on figure 3, a kind of system concentrating radioactive wastewater includes:
For radioactive wastewater to be concentrated adopts the technology such as microfiltration, ultrafiltration or sand filtration remove the pre-processing module of the impurity such as float, colloid;
For holding the raw material tank of radioactive wastewater to be concentrated; Pre-processing module is connected with raw material tank, and the radioactive wastewater after pre-treatment flows into raw material tank by the road;
Being connected with raw material tank, radioactive wastewater to be concentrated carries out the reverse osmosis concentration unit of reverse osmosis concentration, reverse osmosis concentration unit is for adopting pressure-actuated membranous system;
It is connected with the first order counter-infiltration system of reverse osmosis concentration unit, and for receiving and the thickener of the concentrated solution rich in radioelement that accommodating first order counter-infiltration system retains;
It is connected with thickener, and concentrated solution in thickener is carried out the membrane distillation concentration unit of degree of depth concentration; The debris that membrane distillation concentration unit does not distill is transmitted back to thickener by the road, and after the steam that filters out through Membrane Materials is condensed, the defeated reverse osmosis concentration unit that returns to carries out reverse osmosis concentration again; Membrane distillation concentration unit adopts the membranous system that temperature difference drives, and heats and keep design temperature by the liquid in thickener, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam condensation after film is derived; Membrane Materials unit is made up of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m3/ h;
The conductance probe head (not shown) for measuring concentrated solution electrical conductivity it is provided with in thickener, when the electrical conductivity in thickener is higher than the conductance threshold value set, stop importing the produced concentrated solution of reverse osmosis concentration unit thickener the membrane distillation concentration of stopper film distillation unit.
Most high workload liquid level, minimum working solution bit switch (not shown) are set in thickener, in thickener, liquid is higher than most high workload liquid level, suspends in the concentrated solution input thickener retained by the first order counter-infiltration system of reverse osmosis concentration unit until liquid is down to minimum work liquid level in thickener; When liquid is lower than minimum work liquid level in thickener, suspend membrane distillation concentration unit, until the liquid level in thickener rises to most high workload liquid level.
As in figure 2 it is shown, reverse osmosis concentration unit includes three grades of counter-infiltration systems; The liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, imports in thickener; The liquid that other counter-infiltration systems at different levels retain is transmitted back to raw material tank by the road; The water purification that third level counter-infiltration system penetrates meets environmental emission standard and discharges.
Embodiment 5:
The system of the present embodiment concentration radioactive wastewater is substantially the same manner as Example 4, is distinctive in that:
(1) as shown in Figure 4, pre-processing module is arranged between raw material tank and reverse osmosis concentration unit, and the radioactive wastewater in raw material tank, after pre-processing module processes, imports reverse osmosis concentration unit by the road.
(2) as it is shown in figure 5, reverse osmosis concentration unit includes two-pass RO system, the liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, imports in thickener; The liquid that second level counter-infiltration system retains is transmitted back to raw material tank by the road; The water purification that second level counter-infiltration system penetrates meets environmental emission standard and discharges.
Claims (13)
1. the method concentrating radioactive wastewater, it is characterised in that it comprises the steps:
Step one: radioactive wastewater imports reverse osmosis concentration unit and carries out preliminary reverse osmosis concentration, imports thickener by the concentrated solution having retained radioelement, and the water purification penetrated meets discharge after environmental emission requires;
Step 2: the concentrated solution in described thickener is imported Membrane Materials unit and carries out degree of depth concentration, defeated after the steam that goes out through membrane filtration is condensed return to described reverse osmosis concentration unit and again carries out reverse osmosis concentration, and the debris that do not distill is defeated returns to described thickener;
Step 3: measure the electrical conductivity of concentrated solution in described thickener in real time, when this electrical conductivity is higher than the conductance threshold value set, stop concentrated solution produced by reverse osmosis concentration unit described in step one is imported described thickener, and stop the membrane distillation concentration of described Membrane Materials unit, the concentrated solution in described thickener is derived and does subsequent cure and process.
2. the method concentrating radioactive wastewater as claimed in claim 1, it is characterised in that described reverse osmosis concentration unit adopts pressure-actuated membranous system; Described membrane distillation concentration unit adopts the membranous system that temperature difference drives, and heats and keep design temperature by the liquid in described thickener, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam condensation after film is derived.
3. the method concentrating radioactive wastewater as claimed in claim 1, it is characterized in that, monitor the liquid level in described thickener in real time, when liquid is higher than the most high workload liquid level set in thickener, suspends the concentrated solution concentrated by described reverse osmosis concentration unit and input in described thickener until liquid is down to the minimum work liquid level of setting in thickener; When liquid is lower than described minimum work liquid level in described thickener, suspend described membrane distillation concentration unit, until the liquid level in described thickener rises to most high workload liquid level.
4. the method concentrating radioactive wastewater as claimed in claim 1, it is characterised in that before described radioactive wastewater imports described reverse osmosis concentration unit, adopts microfiltration, ultrafiltration or sand filtration technology to remove float, colloidal impurity.
5. the method concentrating radioactive wastewater as claimed in claim 1, it is characterized in that, being provided with raw material tank before described reverse osmosis concentration unit, described radioactive wastewater to be concentrated first imports in described raw material tank, then passes through the delivery pump described reverse osmosis concentration unit of input and concentrates.
6. the method concentrating radioactive wastewater as claimed in claim 5, it is characterised in that described reverse osmosis concentration unit at least includes two-pass RO system; The liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, and imports in described thickener; The liquid that other counter-infiltration systems at different levels retain is transmitted back to described raw material tank.
7. the method concentrating radioactive wastewater as claimed in claim 1, it is characterised in that in described thickener, temperature of liquid controls more than 50 degree; Described membrane distillation concentration unit is made up of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m3/h��
8. the system concentrating radioactive wastewater, it is characterised in that comprising:
Radioactive wastewater to be concentrated is carried out the reverse osmosis concentration unit of reverse osmosis concentration;
It is connected with described reverse osmosis concentration unit, and for receiving and the thickener of concentrated solution produced by accommodating described reverse osmosis concentration unit;
It is connected with described thickener, and concentrated solution in thickener is carried out the membrane distillation concentration unit of membrane distillation concentration;
The debris that described membrane distillation concentration unit does not distill is transmitted back to described thickener by the road, defeated after the steam that filters out through Membrane Materials is condensed return to described reverse osmosis concentration unit and again carries out reverse osmosis concentration;
The conductance probe head for measuring concentrated solution electrical conductivity it is provided with in described thickener, when the electrical conductivity in thickener is higher than the conductance threshold value set, stop concentrated solution produced by described reverse osmosis concentration unit is imported described thickener, and stop the membrane distillation concentration of described membrane distillation concentration unit.
9. concentrate the system of radioactive wastewater as claimed in claim 8, it is characterised in that the system of described concentration radioactive wastewater also includes the raw material tank for holding radioactive wastewater to be concentrated.
10. concentrate the system of radioactive wastewater as claimed in claim 9, it is characterized in that, the system of described concentration radioactive wastewater also includes for adopting microfiltration, ultrafiltration or sand filtration technology to remove the pre-processing module of float, colloidal impurity radioactive wastewater to be concentrated; Described pre-processing module is connected with described raw material tank, and radioactive wastewater after treatment flows into described raw material tank by the road; Or described pre-processing module is arranged between described raw material tank and described reverse osmosis concentration unit, the radioactive wastewater in described raw material tank, after described pre-processing module processes, imports described reverse osmosis concentration unit by the road.
11. concentrate the system of radioactive wastewater as claimed in claim 8, it is characterised in that described reverse osmosis concentration unit adopts pressure-actuated membranous system; Described membrane distillation concentration unit adopts the membranous system that temperature difference drives, and heats and keep design temperature by the liquid in described thickener, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam condensation after film is derived.
12. concentrate the system of radioactive wastewater as claimed in claim 8, it is characterized in that, most high workload liquid level, minimum working solution bit switch are set in described thickener, in thickener, liquid is higher than described most high workload liquid level, suspends the concentrated solution concentrated by described reverse osmosis concentration unit and inputs in described thickener until liquid is down to described minimum work liquid level in thickener; When liquid is lower than described minimum work liquid level in described thickener, suspend described membrane distillation concentration unit, until the liquid level in described thickener rises to most high workload liquid level.
13. concentrate the system of radioactive wastewater as claimed in claim 9, it is characterised in that described reverse osmosis concentration unit at least includes two-pass RO system; The liquid salinity that first order counter-infiltration system retains controls be not less than 5g/L, and imports in described thickener; The liquid that other counter-infiltration systems at different levels retain is transmitted back to described raw material tank by the road.
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| CN103745759B (en) * | 2014-01-09 | 2017-01-18 | 清华大学 | Method and device for processing radioactive wastewater |
| CN104021834B (en) * | 2014-06-24 | 2016-09-28 | 清华大学 | A kind of method and system for nuclear industry concentrated solution decrement |
| CN105884104A (en) * | 2014-12-12 | 2016-08-24 | 北京林业大学 | Method for recovering high-concentration fermentation wastewater useful components and purifying wastewater by membrane distillation-nanofiltration/reverse osmosis combined technique |
| CN105702310B (en) * | 2016-02-24 | 2018-04-06 | 清华大学 | Complex state nucleic 110mAg and 60Co/58Co method in a kind of removal radioactive water |
| CN109994238B (en) * | 2018-01-03 | 2023-05-26 | 清华大学 | Method and system for concentrating and solidifying nuclides in radioactive waste liquid |
| CN108597636A (en) * | 2018-03-19 | 2018-09-28 | 南华大学 | A kind of method and system of film distillation technology processing radioactive wastewater |
| CN110473644B (en) * | 2018-05-09 | 2024-08-13 | 上海核工程研究设计院股份有限公司 | Device and method for removing boron from radioactive waste liquid |
| CN108766610B (en) * | 2018-05-31 | 2022-02-08 | 同济大学 | Concentration treatment method of radioactive wastewater and radioactive wastewater treatment system |
| CN109444944B (en) * | 2018-12-21 | 2024-05-28 | 清华大学 | Method and device for rapidly and automatically analyzing tritium in water |
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| CN103373786B (en) * | 2012-04-28 | 2015-09-09 | 北京林业大学 | A kind for the treatment of process of reverse osmosis concentrated water |
| US20130327711A1 (en) * | 2012-06-11 | 2013-12-12 | Great Salt Lakes Minerals Corporation | Methods for sustainable membrane distillation concentration of hyper saline streams |
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