CN103762004A - Method and system for concentrating radioactive waste water - Google Patents
Method and system for concentrating radioactive waste water Download PDFInfo
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- CN103762004A CN103762004A CN201410028695.4A CN201410028695A CN103762004A CN 103762004 A CN103762004 A CN 103762004A CN 201410028695 A CN201410028695 A CN 201410028695A CN 103762004 A CN103762004 A CN 103762004A
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Abstract
The invention discloses a method for concentrating radioactive waste water. The method for concentrating the radioactive waste water comprises the following steps that the radioactive waste water is led in a reverse osmosis concentrating unit to carry out primary reverse osmosis concentration, and reverse osmosis concentration liquid holding radioactive elements is led into a concentration trough; the concentration liquid in the concentration trough is led into a membrane distillation unit to carry out deep concentration; a conductive probe used for measuring the conductivity of the concentration liquid is arranged in the concentration trough, and when the conductivity in the concentration trough is higher than a set conductive threshold value, the reverse osmosis concentration liquid is stopped from being led into the concentration trough, the membrane distillation concentration of the membrane distillation unit is stopped as well, and the concentration liquid in the concentration trough is led out to carry out solidified treatment. Compared with the prior art, the reverse osmosis and the membrane distillation are adopted as cores in the novel method for concentrating the radioactive waste water, the deep concentration of the reverse osmosis concentration liquid can be achieved, the volume of the radioactive waste liquid is further reduced, the concentration multiple can reach the level similar to that of an evaporation technology, and the energy consumption is only 30-50% that of the evaporation technology.
Description
Technical field
The present invention relates to a kind of sewage disposal technology, the special method for concentration that relates to nuclear industry radioactive wastewater; In addition, the invention still further relates to a kind of system of using the method to process radioactive wastewater.
Background technology
The main target of Spent Radioactive water treatment is to reduce as far as possible the amount of radioactive waste.No matter taking which kind of disposal route, is in fact liquid medium or the solid dielectric to minimum volume by radioactive nuclide enrichment method, and separates control after making most liquid meet related request.Enrichment method the liquid medium of radioactive nuclide as the dense water of membrane process, the steaming raffinate of evaporation technology.Solid dielectric is as ion exchange resin.These materials finally become radioactive waste, carry out long-term geology storage.A cardinal principle of Spent Radioactive water treatment is under rational condition, and the made enrichment method liquid medium of radioactive nuclide or solid dielectric be small quantization as far as possible.
Wherein, the traditional handicraft of radioactive wastewater concentration technology is: evaporation+ion-exchange.Be radioactive wastewater after double flash evaporation is processed, condensed fluid enters ion exchange resin bed and carries out precision processing, meets environmental emission requirement; Enrichment method the steaming raffinate of a large amount of nucleic, after immobilization is processed, carry out long-term geology storage; Enrichment method the ion exchange resin of a large amount of nucleic, after immobilization is processed, carry out long-term geology storage.The advantage of traditional handicraft is: technology maturation, dirt-removing power is strong.Shortcoming is: energy consumption is high; Radioactive spent resin amount is large; Equipment is huge, invests highly, and the problem such as operating conditions is poor, corrosion and scaling is serious.
The rise of membrane technology provides new selection for Spent Radioactive water treatment.Hyperfiltration technique is difficult to remove deliquescent nucleic ion, but can remove the trickle suspension, colloidal material and the part larger molecular organics that in water, exist, remove thus by colloid or particle is carried secretly or form the nucleic ion of complex compound with larger molecular organics.Counter-infiltration, nanofiltration can be removed the nucleic ion of ionic state, but influent quality is had to higher requirement.Generally, need, according to the water quality characteristic of radioactive wastewater, design pointed film integrated system.
Summary of the invention
For solving the problems referred to above of prior art, primary and foremost purpose of the present invention is to provide a kind of method of simply and efficiently concentrated radioactive wastewater, and secondary objective is to provide a kind of the method for using to carry out concentrated system to radioactive wastewater.
For achieving the above object, the method for a kind of concentrated radioactive wastewater of the present invention comprises the steps:
Step 1: radioactive wastewater is imported to reverse osmosis concentration unit and carry out preliminary reverse osmosis concentration, the concentrate of having held back radioelement imports thickener, and the water purification penetrating meets environmental emission and requires rear discharge;
Step 2: the concentrate in described thickener is imported to film distillation unit and carry out further membrane distillation concentration, the steam going out through membrane filtration defeated described reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration again, and the Liquid Residue that do not distill is defeated gets back to described thickener;
Step 3: measure in real time the conductivity in thickener, when this conductivity is led threshold value higher than the electricity of setting, the concentrate that stops the unit of reverse osmosis concentration described in step 1 to produce imports described thickener, and stop the membrane distillation concentration that described film distills unit, the concentrate in described thickener is derived and done follow-up curing processing.
Further, described reverse osmosis concentration unit adopts pressure-actuated film system; The film system that described membrane distillation concentration unit adopts temperature difference to drive, is about to the heating liquid in described thickener and keeps design temperature, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam is derived through condensation after film.
Further, liquid level described in Real-Time Monitoring in thickener, in thickener liquid higher than set high workload liquid level time, suspend the concentrated concentrate in described reverse osmosis concentration unit is inputted in described thickener until in thickener liquid be down to the minimum work liquid level of setting; 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 high workload liquid level.
Further, before described radioactive wastewater imports described reverse osmosis concentration unit, adopt the technology such as micro-filtration, ultrafiltration or sand filtration to remove the impurity such as suspension, colloid.
Further, described reverse osmosis concentration is provided with raw material tank before unit, and described radioactive wastewater to be concentrated first imports in described raw material tank, then by discharge pump, inputs described reverse osmosis concentration unit and concentrates.
Further, described reverse osmosis concentration unit at least comprises two-pass RO system; The liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, imports in described thickener; The liquid that other counter-infiltration systems at different levels are held back is transmitted back to described raw material tank.
Further, more than in described thickener, fluid temperature is controlled at 50 degree, described film distillation unit is comprised of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m
3/ h.
Further, in described thickener, radioactivity total activity level is no more than 10E+9Bq/L.
Further, before starting concentrated radioactive wastewater and afterwards, described reverse osmosis concentration unit and described membrane distillation concentration unit are carried out to on-line rinsing with the water purification that on-radiation water or step 1 produce, during flushing, running parameter is constant.
A kind of system of concentrated radioactive wastewater comprises:
Radioactive wastewater to be concentrated is carried out to the reverse osmosis concentration unit of reverse osmosis concentration;
Be connected with described reverse osmosis concentration unit, and for receiving the thickener of the concentrate that also accommodating described reverse osmosis concentration unit produces;
Be connected with described thickener, and concentrate in thickener carried out to the membrane distillation concentration unit of membrane distillation concentration;
The Liquid Residue that described membrane distillation concentration unit does not distill is transmitted back to described thickener by the road, and the steam going out through film distillating filtering defeated described reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration again;
In described thickener, be provided with for measuring the electricity of concentrate conductivity and lead probe, the conductivity in thickener is led threshold value higher than the electricity of setting, and stops reverse osmosis concentrated liquid importing described thickener, and stops the membrane distillation concentration of described film distillation unit.
Further, the system of described concentrated radioactive wastewater also comprises for holding the raw material tank of radioactive wastewater to be concentrated.
Further, the system of described concentrated radioactive wastewater also comprises for adopt the technology such as micro-filtration, ultrafiltration or sand filtration to remove the pre-processing module of the impurity such as suspension, colloid to 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 is processed, imports described reverse osmosis concentration unit by the road.
Further, described reverse osmosis concentration unit adopts pressure-actuated film system; The film system that described membrane distillation concentration unit adopts temperature difference to drive, is about to the heating liquid in described thickener and keeps design temperature, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam is derived through condensation after film.
Further, high workload liquid level, minimum working fluid bit switch are set in described thickener, liquid is higher than described high workload liquid level in thickener, suspend the concentrate of first order reverse osmosis concentration in described reverse osmosis concentration unit is inputted in described thickener until in thickener liquid be down to described minimum work liquid level; 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 high workload liquid level.
Further, described reverse osmosis concentration unit at least comprises two-pass RO system; The liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, imports in described thickener; The liquid that other counter-infiltration systems at different levels are held back is transmitted back to described raw material tank by the road.
Further, described film distillation unit is comprised of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m
3/ h.
This patent has proposed to take the Novel radioactive wastewater method for concentration that the distillation of counter-infiltration+film is core.Wherein, the elementary concentrating function of radioactive wastewater has been born in counter-infiltration, the fresh water that counter-infiltration produces meets after related request can environmental emission, the concentrate circulation that counter-infiltration produces is through film distillation assembly, utilize the inside and outside vapour pressure deficit of membrane module that the steam producing is derived, derive steam condensing and form film distillation fresh water, carry out the degree of depth and concentrate.
The System and method for of the concentrated radioactive wastewater that this patent proposes, novelty is:
1), than the counter-infiltration often adopting in the world, can further reduce the volume of radioactive liquid waste.Utilize reverse osmosis technology to concentrate radioactive wastewater, although can reduce energy consumption, its cycles of concentration still has larger gap compared with evaporation technology.Adopting the distillation of counter-infiltration+film is the Novel radioactive contact scar Waste water concentrating method of core, can realize the secondary concentration of reverse osmosis concentrated liquid, further reduce the volume of radioactive liquid waste, its cycles of concentration can reach the level similar with evaporation technology, and energy consumption is only the 30-50% of evaporation technology.
2) compare with conventional evaporation technology, at aspects such as equipment size, operability, maintenance and repairs, there is obvious advantage.Traditional evaporation equipment is bulky, and radiation protection requires high, has the problems such as corrosion and scaling, and equipment replacement difficulty is large.The Novel radioactive contact scar Waste water concentrating technique that counter-infiltration+film distillation of take is core is simply compact, the equipment that each process procedure relates to and raw water box, pipeline, valve, measuring instrument, control system etc. can be integrated in Mobile cabinet, the fast moving of realization between different location, replacing is switched on and can normally be worked behind work place.Built-in system has a style of one's own, and externally only establishes water inlet, fresh water water delivering orifice and three intake-outlets of concentrated solution outlet, and integrated system has the functions such as auto-flushing, Water free alarming, fault alarm, the online demonstration of water quality.
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 architecture schematic diagram of concentrated radioactive wastewater in embodiment 4;
Fig. 4 is the system architecture schematic diagram of concentrated reflection wastewater in embodiment 5;
Fig. 5 is embodiment 5 reverse osmosis concentration cellular construction schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
embodiment 1
As shown in Figure 1, concentrated radioactivity level is 7000Bq/L, the radioactive wastewater method for concentration that salt content is 2g/L.
(1) first to each membrane module, adopt on-radiation water to carry out auto-flushing during system boot, after enter normal working routine.
(2) radioactive wastewater is carried out to pre-treatment: the impurity such as the suspension in ultrafiltration removal radioactive wastewater, colloid, enter raw material tank by the radioactive wastewater after processing.
In addition, this operation can also adopt the technology such as micro-filtration, sand filtration to remove the impurity such as suspension, colloid.
(3) radioactive wastewater after pre-treatment is imported to reverse osmosis concentration unit and carry out reverse osmosis concentration, the concentrate of having held back radioelement is imported to thickener, the water purification penetrating meets environmental emission and requires rear discharge; As shown in Figure 2, reverse osmosis concentration unit adopts pressure-actuated three grades of counter-infiltration systems, the water purification that upper level reverse osmosis appears enter next stage counter-infiltration system.Wherein first order counter-infiltration system is divided into 3 sections, and counter-infiltration system overall recovery is 75%.The fresh water radioactivity of three grades of counter-infiltrations is respectively 200 Bq/L, 80 Bq/L, 30 Bq/L, the fresh water discharge that afterbody counter-infiltration system produces.The liquid salt content that first order counter-infiltration system is held back, in 8g/L left and right, all imports in thickener; The liquid that the second level and third level counter-infiltration system are held back is transmitted back to raw material tank.
(4) concentrate in thickener is imported to film distillation unit and carry out membrane distillation concentration, the steam going out through membrane filtration defeated reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration, the defeated thickener of getting back to of Liquid Residue not distilling again.
The most high and low working fluid bit switch is set in thickener.Liquid is higher than the high workload liquid level of setting in thickener, and reverse osmosis concentrated liquid returns to raw material tank, or closes reverse osmosis concentration unit, until liquid is down to the minimum work liquid level of setting in thickener.Liquid, lower than minimum work liquid level, suspends membrane distillation concentration unit in thickener, until liquid level rises to high workload liquid level.
The film Distallation systm that membrane distillation concentration unit adopts temperature difference to drive.In thickener, concentrate heating and temperature control is at 50 degree, concentrate in groove enters the film distillation assembly 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, turns back in the first order of reverse osmosis concentration unit or second level counter-infiltration system and carries out secondary reverse-osmosis treated.The undistilled Liquid Residue of having held back radioactive nuclide returns to thickener.
Wherein the film system of membrane distillation concentration unit is comprised of four membrane modules, and single membrane module circular flow is controlled at
6 m 3 / h,four parallel connections, membrane flux is
6L/ (m 2 .h).
(5) in thickener, be provided with for measuring in real time the electricity of concentrate conductivity and lead probe, it is 30S/m that predefined electricity is led threshold value, and now in thickener, radioactivity total activity level is no more than 10E+9Bq/L.Conductivity in thickener during higher than 30S/m, stops reverse osmosis concentrated liquid importing thickener, and the membrane distillation concentration of stopper film distillation unit.
(6) liquid in thickener is conveyed into the regular barrel that is equipped with in advance a certain amount of cement through charging pump, after stirring, forms firming body with cement.
In addition, the concentrate obtaining after operation (5) is concentrated can also be stored by additive method.
(7) repeat operation (2) to (6) until whole radioactive wastewater is disposed.
(8) when system is stopped transport, with the fresh water that on-radiation water or system produce, carry out on-line rinsing, running parameter is constant.
After above-mentioned operation is processed, the total cycles of concentration of radioactive wastewater reaches more than 100 times.
embodiment 2
The radioactivity level of the handled radioactive wastewater of the present embodiment is 5000Bq/L, the radioactive wastewater that salt content is 1g/L.
Enrichment process is substantially the same manner as Example 1, and difference is:
(1) reverse osmosis concentration unit adopts two steps ro film system, and first order counter-infiltration system is divided into again 3 sections, and counter-infiltration system overall recovery is 80%.The fresh water radioactivity of two-pass RO system is respectively 150 Bq/L, 50 Bq/L, the fresh water discharge that afterbody film system produces.The concentrate that first order counter-infiltration system produces all enters thickener, and salt content is in 5g/L left and right.
(2) in thickener, concentrate heating and temperature control is at 55 degree, and the single membrane module circular flow of membrane distillation concentration unit is 8
m 3 / h, four parallel connections, the membrane flux of whole distillation and concentration unit is 8L/ (m
2 .h).
(3) predefined electricity is led threshold value 40S/m, and now in thickener, radioactivity total activity level is no more than 10E+9Bq/L.
(4) the total cycles of concentration of radioactive wastewater after last the method processing reaches more than 200 times.
embodiment 3:
The radioactivity level of the handled radioactive wastewater of the present embodiment is 3000Bq/L, the radioactive wastewater that salt content is 3g/L.
Enrichment process and embodiment are basic identical, and difference is:
(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%.The fresh water radioactivity of three grades of counter-infiltrations is respectively 100 Bq/L, 50 Bq/L, 10 Bq/L, the fresh water discharge that afterbody film system produces.The concentrate that first order counter-infiltration system produces all enters thickener, and salt content is in 9g/L left and right.
(2) in thickener, concentrate heating and temperature control is at 60 degree, and the single membrane module circular flow of membrane distillation concentration unit is 4
m 3 / h, the membrane flux of distillation and concentration unit is 4L/ (m
2 .h).
(3) predefined electricity is led threshold value 50S/m, and now in thickener, radioactivity total activity level is no more than 10E+9Bq/L.
(4) the total cycles of concentration of radioactive wastewater after last the method processing reaches 100 times of left and right.
embodiment 4:
As shown in Figure 3, a kind of system of concentrated radioactive wastewater comprises:
For radioactive wastewater to be concentrated being adopted to the technology such as micro-filtration, ultrafiltration or sand filtration, remove the pre-processing module of the impurity such as suspension, 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;
Be connected with raw material tank, radioactive wastewater to be concentrated carried out to the reverse osmosis concentration unit of reverse osmosis concentration, reverse osmosis concentration unit is for adopting pressure-actuated film system;
Be connected with the first order counter-infiltration system of reverse osmosis concentration unit, and for receiving the thickener of the concentrate that is rich in radioelement that also accommodating first order counter-infiltration system is held back;
Be connected with thickener, and concentrate in thickener is carried out to the concentrated membrane distillation concentration unit of the degree of depth; The Liquid Residue that membrane distillation concentration unit does not distill is transmitted back to thickener by the road, and the steam going out through film distillating filtering defeated reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration again; The film system that membrane distillation concentration unit adopts temperature difference to drive, is about to the heating liquid in thickener and keeps design temperature, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam is derived through condensation after film; Film distillation unit is comprised of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m
3/ h;
In thickener, be provided with for measuring the electricity of concentrate conductivity and lead probe (not shown), conductivity in thickener is led threshold value higher than the electricity of setting, stop the concentrate producing of reverse osmosis concentration unit to import thickener, and the membrane distillation concentration of stopper film distillation unit.
High workload liquid level, minimum working fluid bit switch (not shown) are set in thickener, liquid is higher than high workload liquid level in thickener, suspend in the concentrate input thickener that the first order counter-infiltration system of reverse osmosis concentration unit is held back until in thickener liquid be down to minimum work liquid level; When liquid is lower than minimum work liquid level in thickener, suspend membrane distillation concentration unit, until the liquid level in thickener rises to high workload liquid level.
As shown in Figure 2, reverse osmosis concentration unit comprises three grades of counter-infiltration systems; The liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, imports in thickener; The liquid that other counter-infiltration systems at different levels are held back 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 concentrated radioactive wastewater of the present embodiment is substantially the same manner as Example 4, and difference is:
(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 is processed, imports reverse osmosis concentration unit by the road.
(2) as shown in Figure 5, reverse osmosis concentration unit comprises two-pass RO system, and the liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, imports in thickener; The liquid that second level counter-infiltration system is held back 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. a method for concentrated radioactive wastewater, is characterized in that, it comprises the steps:
Step 1: radioactive wastewater is imported to reverse osmosis concentration unit and carry out preliminary reverse osmosis concentration, the concentrate of having held back radioelement is imported to thickener, the water purification penetrating meets environmental emission and requires rear discharge;
Step 2: concentrate in described thickener is imported to film distillation unit, and to carry out the degree of depth concentrated, and the steam going out through membrane filtration defeated described reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration again, the Liquid Residue that do not distill is defeated gets back to described thickener;
Step 3: the conductivity of measuring in real time concentrate in described thickener, when this conductivity is led threshold value higher than the electricity of setting, the concentrate that stops the unit of reverse osmosis concentration described in step 1 to produce imports described thickener, and stop the membrane distillation concentration that described film distills unit, the concentrate in described thickener is derived and done follow-up curing processing.
2. concentrate as claimed in claim 1 the method for radioactive wastewater, it is characterized in that, described reverse osmosis concentration unit adopts pressure-actuated film system; The film system that described membrane distillation concentration unit adopts temperature difference to drive, is about to the heating liquid in described thickener and keeps design temperature, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam is derived through condensation after film.
3. concentrate as claimed in claim 1 the method for radioactive wastewater, it is characterized in that, liquid level described in Real-Time Monitoring in thickener, in thickener liquid higher than set high workload liquid level time, suspend the concentrated concentrate in described reverse osmosis concentration unit is inputted in described thickener until in thickener liquid be down to the minimum work liquid level of setting; 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 high workload liquid level.
4. concentrate as claimed in claim 1 the method for radioactive wastewater, it is characterized in that, before described radioactive wastewater imports described reverse osmosis concentration unit, adopt micro-filtration, ultrafiltration or sand filtration technology to remove suspension, colloidal impurity.
5. concentrate as claimed in claim 1 the method for radioactive wastewater, it is characterized in that, described reverse osmosis concentration is provided with raw material tank before unit, and described radioactive wastewater to be concentrated first imports in described raw material tank, then by discharge pump, inputs described reverse osmosis concentration unit and concentrates.
6. concentrate as claimed in claim 5 the method for radioactive wastewater, it is characterized in that, described reverse osmosis concentration unit at least comprises two-pass RO system; The liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, and imports in described thickener; The liquid that other counter-infiltration systems at different levels are held back is transmitted back to described raw material tank.
7. concentrate as claimed in claim 1 the method for radioactive wastewater, it is characterized in that, more than fluid temperature is controlled at 50 degree in described thickener; Described membrane distillation concentration unit is comprised of a membrane module, or is composed in parallel by some membrane modules, and every membrane module circular flow is not less than 4m
3/ h.
8. a system for concentrated radioactive wastewater, is characterized in that, it comprises:
Radioactive wastewater to be concentrated is carried out to the reverse osmosis concentration unit of reverse osmosis concentration;
Be connected with described reverse osmosis concentration unit, and for receiving the thickener of the concentrate that also accommodating described reverse osmosis concentration unit produces;
Be connected with described thickener, and concentrate in thickener carried out to the membrane distillation concentration unit of membrane distillation concentration;
The Liquid Residue that described membrane distillation concentration unit does not distill is transmitted back to described thickener by the road, and the steam going out through film distillating filtering defeated described reverse osmosis concentration unit of getting back to after condensation carries out reverse osmosis concentration again;
In described thickener, be provided with for measuring the electricity of concentrate conductivity and lead probe, conductivity in thickener is led threshold value higher than the electricity of setting, the concentrate that stops described reverse osmosis concentration unit to produce imports described thickener, and stops the membrane distillation concentration of described membrane distillation concentration unit.
9. concentrate as claimed in claim 8 the system of radioactive wastewater, it is characterized in that, the system of described concentrated radioactive wastewater also comprises for holding the raw material tank of radioactive wastewater to be concentrated.
10. concentrate as claimed in claim 9 the system of radioactive wastewater, it is characterized in that, the system of described concentrated radioactive wastewater also comprises for adopting micro-filtration, ultrafiltration or sand filtration technology to remove the pre-processing module of suspension, colloidal impurity to 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 is processed, imports described reverse osmosis concentration unit by the road.
11. concentrate the system of radioactive wastewater as claimed in claim 8, it is characterized in that, described reverse osmosis concentration unit adopts pressure-actuated film system; The film system that described membrane distillation concentration unit adopts temperature difference to drive, is about to the heating liquid in described thickener and keeps design temperature, imports hydrophobic film assembly, keeps the temperature difference of film both sides, and hot side vapour pressure is higher than cold side, and steam is derived through condensation after film.
12. concentrate the system of radioactive wastewater as claimed in claim 8, it is characterized in that, high workload liquid level, minimum working fluid bit switch are set in described thickener, liquid is higher than described high workload liquid level in thickener, suspend the concentrated concentrate in described reverse osmosis concentration unit is inputted in described thickener until in thickener liquid be down to described minimum work liquid level; 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 high workload liquid level.
13. concentrate the system of radioactive wastewater as claimed in claim 9, it is characterized in that, described reverse osmosis concentration unit at least comprises two-pass RO system; The liquid salt content that first order counter-infiltration system is held back is controlled at and is not less than 5g/L, and imports in described thickener; The liquid that other counter-infiltration systems at different levels are held back is transmitted back to described raw material tank by the road.
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