CN101597113A - A kind of treatment process of uranium-containing waste water - Google Patents
A kind of treatment process of uranium-containing waste water Download PDFInfo
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- CN101597113A CN101597113A CN 200910043805 CN200910043805A CN101597113A CN 101597113 A CN101597113 A CN 101597113A CN 200910043805 CN200910043805 CN 200910043805 CN 200910043805 A CN200910043805 A CN 200910043805A CN 101597113 A CN101597113 A CN 101597113A
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Abstract
A kind of treatment process of uranium-containing waste water, it comprises removes uranium and two technologies of dephosphorization, before this will except that the uranium agent by mass concentration ratio: uranium: remove uranium agent=2～20: 1 directly adds removing in the uranium pond in uranium-containing waste water, by in removing the uranium pond, uranium-containing waste water being carried out stir process, sedimentation processing, to carry out solid-liquid separation by inclined-plate clarifying basin through the waste water of flocculation treatment again, remove the uranium of uranium-containing waste water, the uranium clearance reaches 99%.Add the milk of lime clear liquor then in flocculation basin, by the phosphorus in row stir process, sedimentation processing and the solid-liquid separation removal waste water, the clearance of phosphorus reaches 99.99%.In equalizing tank, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings at last.
Description
Technical field
The present invention relates to a kind of to containing the treatment process of radioactive wastewater, particularly a kind of treatment process to uranium-containing waste water.
Background technology
Current, the application of radioelement in military affairs, the energy, industry, agricultural, medical science and other scientific researches is extremely extensive.Meanwhile, the quantity of radioactive emission, waste liquid and the solid-state castoff that is produced in whole development and use process is more and more, endangers also increasingly, and this must cause the concern that people are deeper.In radioactivity " three wastes ", the ratio that the contained radioactivity total amount of radioactive wastewater accounts for ortho states radwaste total amount is quite big, therefore especially should pay attention to its processing.
Uranium discharges alpha-ray as important radioelement, and human body is produced the radioactive radiation damage.By approach such as drinking-water (account for total intake 64%) and food chains, the uranium part in the water body finally can enter human body and cause potential threat.Studies show that: the uranium that enters behind the human body is mainly accumulated in liver, kidney and bone, with chemical toxicity and two kinds of forms of internal radiation human body is caused damage, according to the dosage size, can cause acute or chronic poisoning, bring out the generation of various diseases or cause sudden change, distortion even canceration.Therefore, the research of how to remove and to reclaim uranium-containing waste water rationally and effectively comes into one's own day by day.
Fundamentally, adopt any water treatment method all can not change inherent radioactivity decay characteristic in the uranium waste water, two fundamental principles are generally followed in its processing: (1) enters water body with uranium-containing waste water, reach harmless level by dilution and diffusion, it mainly is applicable to the processing of the uranium-containing waste water of extremely low concentration; (2) uranium-containing waste water is concentrated after, its enriched product and human living environment are isolated for a long time, the decay of giving free rein to, it is all suitable to high, medium and low concentration uranium-containing waste water.
At present both at home and abroad common practice is that uranium waste water is carried out recovery after the concentration, storage or solidification treatment.Therefore, the evaluation index of uranium water treatment effect mainly contains two: the one, and cycles of concentration; The 2nd, decontamination multiple or purification multiple.Original volume that the former refers to uranium waste water with handle after the ratio of uranium concentration matter volume, cycles of concentration is big more, the volume after then concentrating is more little, just stores also economy, safety more; Original concentration that the latter refers to uranium waste water with handle after the ratio of remaining uranium concentration, the decontamination multiple is big more, the residue uranium concentration is low more in the raffinate after then handling, discharging, store just safe more.
Domestic and international existing uranium wastewater processing technology can be divided into not political reform of chemical form and chemical form simply and change method two classes.Wherein not political reform of chemical form comprises evaporation concentration method, ion exchange method, absorption method, membrane processing method etc.; Chemical form changes method and mainly refers to chemical precipitation method etc.
Evaporation concentration method is a non-volatile character of utilizing uranium in the waste water, and uranium waste water is sent into evaporation unit, imports heating steam simultaneously water is flashed to water vapour, and uranium is then stayed in the residual solution and concentrated, and one of great advantage of method of evaporation is a decontamination multiple height.Although evaporation concentration method efficient is higher, power consumption is big, expense is high, in addition, also exists the danger of burn into foam, fouling and blast.Therefore, this law use pre-treatment total solids volumetric concentration is big, chemical composition change big, need the high decontamination multiple and the waste water of flow less waste water, particularly middle and high radioactive level.
The principle that ion exchange method is handled radioactive wastewater is that when waste liquid passed through ion-exchanger, uranyl ion exchanged on the ion-exchanger, and waste liquid is purified.The shortcoming of ion exchange method method is: raw water quality is had relatively high expectations; To containing the waste water of high density competing ions with processing, often need to adopt the secondary ion exchange column, perhaps additional electrodialysis appts before ion exchange column is to remove the constant competing ions; The regeneration of ion-exchanger and disposal be difficulty.
Absorption method is to handle radioactive liquid waste with porous solid adsorbent, and wherein contained a kind of or several nucleic are adsorbed on its surface, thereby reaches the purpose of removing harmful element.In the processing to uranium-containing waste water, sorbent material commonly used has gac, zeolite etc.Absorption method is inapplicable when big to wastewater flow rate, and loading capacity is limited, can only be fit to the processing of lower concentration radioactive wastewater.
Film is handled as a kind of new branch of science, is in the stage of constantly applying.Currently used membrane technique mainly contains: methods such as micro-filtration (MF), ultrafiltration (UF), reverse osmosis filter (RO), electrodialysis (ED), electrochemical ion exchange (EIX), ferrite adsorption filtration membrane sepn.Compare with conventional processes, membrane technique is when handling the uraniferous radioactive wastewater of lower concentration, and it is good to have an effluent quality, cycles of concentration height, plurality of advantages such as stable and reliable operation.The shortcoming of membrane processing method is: several factors such as the pH value of the consistency of film and the size in hole, water and temperature are relevant, and investment cost is higher, and easily fouling makes this method be difficult to apply in some cases.
Chemical precipitation method is uranyl ion generation co-precipitation in physics chemical action such as the adsorption bridging, charge neutrality by dosing coagulant and the waste liquid, or is condensed into tiny precipitable particle, and is combined into loose suede grain with suspended substance in the water.This suede grain has very strong adsorptive power to the uranyl ion in the water, thus the uranium-bearing material in purifying waste water, colloid and suspended substance.Cause that the coprecipitated reason of uranium and certain insoluble sediment has comprised eutectic, absorption, gelatinizing, held back and directly multiple effect such as precipitation, therefore it is higher to remove efficient, and this method is easy, expense is cheap, remove wider, the water-fast power of element kind and the water quality impact load is strong, technology and equipment is ripe.But chemical precipitation method common chemical precipitation agent, flocculation agent and coagulant aids (as aluminium salt, molysite, lime, soda, active silica, clay, polyelectrolyte etc.) single with or coupling after handling to go out water concentration often still not up to standard, must be for further processing, and precipitated product needs secondary treatment.In those early years there is bibliographical information to use the treatment agent sodium phosphate in conjunction with calcium oxide, divalent iron salt, regulate waste liquor PH between 11.3～11.5, under the condition of best dosage, can will contain uranium concentration be the handling to 0.05mg/L of waste water of 10mg/L, reach the emission standard that country allows.This method was promoted because of harsh being difficult to of the control condition of pH.The domestic scholar's of having experimental study in recent years shows, the magnesium hydroxide treatment agent has the good uranium effect of removing, be particularly suitable for the processing of the underground low-activity uranium-containing waste water of acid after molten the soaking, under certain condition, the uranium content in the waste water can be reduced to below the 0.05mg/L.But find that by test magnesium hydroxide is only obvious to the lower concentration uranium-containing waste water treatment effect of uranium concentration≤1mg/L, the uranium-containing waste water that is higher than 10mg/L is not suitable for adopting this method, and this method dosage is big, and the quantity of slag is big, and clearance is also not satisfactory.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of treatment process of new uranium-containing waste water is provided.
Technical scheme of the present invention is: a kind of treatment process of uranium-containing waste water, and its concrete technical process is as follows:
One, adds except that the uranium agent
Will except that the uranium agent by mass concentration ratio: uranium: remove uranium agent=2～20: 1 directly adds in the removing in the uranium pond of uranium-containing waste water, describedly removes the uranium agent and is: potassium primary phosphate, or SODIUM PHOSPHATE, MONOBASIC, or potassium hydrogen phosphate, or sodium hydrogen phosphate;
Two, stir process
Use agitator to stir to the uranium-containing waste water that adds except that the uranium agent in removing the uranium pond, the agitation condition parameter is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin, sedimentation is handled can adopt natural subsidence or flocculating settling, and the waste water natural subsidence of wherein not having other impurity is consuming time longer, by adding polymeric flocculant, can quicken the solution settling time, promotes solid-liquid separation.Flocculation agent is by volume: flocculation agent: waste water=1: 800-1000 adds, and described flocculation agent can be polyacrylamide, bodied ferric sulfate;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin;
Five, add lime
In the supernatant liquor of flocculation basin, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator to stir in flocculation basin, the agitation condition parameter is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin, sedimentation is handled can adopt natural subsidence or flocculating settling, and the waste water natural subsidence of wherein not having other impurity is consuming time longer, by adding polymeric flocculant, can quicken the solution settling time, promotes solid-liquid separation.Flocculation agent is by volume: flocculation agent: waste water=1: 800-1000 adds, and described flocculation agent can be polyacrylamide, bodied ferric sulfate;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters equalizing tank;
Nine, regulate pH
In equalizing tank, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
Uranium wastewater treatment method provided by the invention its remove the uranium principle and the dephosphorization principle as follows:
One, removes the uranium principle
Uranium in the water body is owing to the difference of emission source, and the concentration of uranium also is not quite similar, but it exists form similar substantially, mainly is with uranium (IV) and uranium (VI) two states and its metallic compound or oxide compound coexistence.Wherein uranium (VI) is usually with UO
2 2+The uranyl ion form exists, and solubility is better, is not easy to remove, and water body removes uranium and promptly refers to removal uranium (VI) and compound thereof.
The present invention is uranyl ion and potassium primary phosphate or the water-fast precipitation of SODIUM PHOSPHATE, MONOBASIC reaction generation.Wherein the chemical equation of uranyl ion and dihydrogen phosphate is:
M
1H
2PO
4+UO
2 2+→UO
2HPO
4·4H
2O↓+M
1PUO
6·3H
2O↓+UO
3↓(M＝Na，K)
Handle 1000mgL with potassium primary phosphate
-1Uranium solution (distilled water configuration), precipitation after drying solid-liquid separates, through GENESS energy spectrometer (EDAX) carry out ultimate analysis, QUANTA-200 scanning electron microscope (SEM) is carried out morphology analysis, carry out material phase analysis by Rigaku D/Max 2500 18k x-ray diffractometers (XRD) again, the result shows that this precipitation is a kind of cotton-shaped mixture, form by element O, P, K, U, the average percentage by mass of each element is respectively 17.67%, 4.17%, 3.15%, 75.04%, and main component is four hypophosphite monohydrate hydrogen uranyl UO
2HPO
44H
2O (being commonly called as the water uranite), three hydrated potassium uranium phosphoric acid salt KPUO
63H
2O, and uranium trioxide UO
3
X-ray diffraction pattern has demonstrated this sedimentary crystalline structure, as shown in Figure 2.
Two, dephosphorization principle
Present method is after the uranium of effectively removing in the waste water, and potassium primary phosphate that adds or SODIUM PHOSPHATE, MONOBASIC will have 20～40% phosphorus and remain in and wait in the waste water to remove.Therefore, this law adopts the phosphorus in the lime method processing raffinate, and by adding the milk of lime clear liquor, calcium ion and phosphate radical reaction generate the calcium phosphate powder precipitation and remove phosphate radical.Reaction formula is as follows:
5Ca
2++7OH
-+3H
2PO
4 -＝Ca
5(OH)(PO
4)
3↓+6H
2O
Calcium ion not only has above-mentioned precipitating action, Ca (OH)
2Also have good cohesion adsorption as coagulating agent, technology adds a small amount of polymer coagulant aids again, according to the throw out sedimentation function, designs corresponding hybrid reaction, settling vessel parameter, can guarantee that the treat effluent phosphate concn is less than 0.5mgL
-1
The present invention compared with prior art has following characteristics:
One, method is simple, processing ease
As long as throw in except that the uranium agent and can remove uranyl ion in the waste water, phosphate radical remaining in the waste liquid can effectively be removed by adding lime, and the technical process that utilizes conventional chemical precipitation method to handle waste water gets final product, and does not increase cost of equipment.
Two, removal effect is good
Remove uranium agent and uranyl ion generation chemical reaction, generate precipitations such as water-fast uranyl hydrogen phosphate, potassium (sodium) uranium phosphoric acid salt, uranium trioxide rapidly, make that uranium concentration is lower than 0.05mgL in the waste water
-1, reach discharging standards, and cycles of concentration being big, the decontamination multiple is big, removal effect is good.
Three, applied widely
(1) no matter uranyl ion concentration just all can once be reduced to uranium concentration below the emission standard in the waste water;
(2), no matter be alkalescence or tart uranium-containing waste water when removing uranium, all can once uranium be handled up to standardly, need not regulate its pH value; Follow-up dephosphorization is with low cost, and effect is remarkable;
(3), under normal temps, can finish this reaction, there is not the temperature condition restriction.
Four, dosage is little, and sludge quantity is few
The dosage that removes the uranium agent is little, the residue rate that generates less than 1%.
Five, help recycling uranium in the uranium-containing waste water
The mass concentration of uranium is greater than 70% in the residue.
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Description of drawings
Accompanying drawing 1 is a process flow sheet of the present invention;
Accompanying drawing 2 is to adopt the present invention to remove the sedimentary x-ray diffraction pattern that generates in the uranium process.
Embodiment
Embodiment one, a kind of treatment process of uranium-containing waste water, and the uranium concentration of uranium-containing waste water is 0.1～1000mgL
-1, its technical process is as follows:
One, adds except that the uranium agent
With potassium primary phosphate by mass concentration ratio: uranium: potassium primary phosphate=2～20: 1 directly adds removing in the uranium pond 1 in uranium-containing waste water;
Two, stir process
Use agitator 6 to stir to the uranium-containing waste water that adds potassium primary phosphate in removing uranium pond 1, mixing parametric is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
After stirring the uranium-containing waste water that removes in the uranium pond 1 is carried out the sedimentation processing, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 2 through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin 3, and this moment, the uranium concentration of uranium waste water was 0.022mgL
-1, the uranium clearance reaches 99%, and the remaining rate of phosphorus is 30%;
Five, add lime
In the supernatant liquor of flocculation basin 3, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator 7 to stir in flocculation basin 3, mixing parametric is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin 3, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 4 through the waste water of flocculation treatment, mud is from inclined-plate clarifying basin 4 following discharges, and supernatant liquor enters equalizing tank 5, and this moment, the mass concentration of phosphorus was 0.025mgL
-1, the clearance of phosphorus reaches 99.99%;
Nine, regulate pH
In equalizing tank 5, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
Embodiment two, a kind of treatment process of uranium-containing waste water, and the uranium concentration of uranium-containing waste water is 0.1～1000mgL
-1, its technical process is as follows:
One, adds except that the uranium agent
With SODIUM PHOSPHATE, MONOBASIC by mass concentration ratio: uranium: SODIUM PHOSPHATE, MONOBASIC=2～20: 1 directly adds removing in the uranium pond 1 in uranium-containing waste water;
Two, stir process
Use agitator 6 to stir to the uranium-containing waste water that adds SODIUM PHOSPHATE, MONOBASIC in removing uranium pond 1, mixing parametric is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
After stirring the uranium-containing waste water that removes in the uranium pond 1 is carried out the sedimentation processing, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 2 through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin 3, and this moment, the uranium concentration of uranium waste water was 0.022mgL
-1, the uranium clearance reaches 99%, and the remaining rate of phosphorus is 30%;
Five, add lime
In the supernatant liquor of flocculation basin 3, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator 7 to stir in flocculation basin 3, mixing parametric is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin 3, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 4 through the waste water of flocculation treatment, mud is from inclined-plate clarifying basin 4 following discharges, and supernatant liquor enters equalizing tank 5, and this moment, the mass concentration of phosphorus was 0.025mgL
-1, the clearance of phosphorus reaches 99.99%;
Nine, regulate pH
In equalizing tank 5, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
Embodiment three, a kind of treatment process of uranium-containing waste water, and the uranium concentration of uranium-containing waste water is 0.1～1000mgL
-1, its technical process is as follows:
One, adds except that the uranium agent
With potassium hydrogen phosphate by mass concentration: uranium: potassium hydrogen phosphate=2～20: 1 directly adds removing in the uranium pond 1 in uranium-containing waste water;
Two, stir process
Use agitator 6 to stir to the uranium-containing waste water that adds potassium hydrogen phosphate in removing uranium pond 1, mixing parametric is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
After stirring the uranium-containing waste water that removes in the uranium pond 1 is carried out the sedimentation processing, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 2 through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin 3, and this moment, the uranium concentration of uranium waste water was 0.022mgL
-1, the uranium clearance reaches 99%, and the remaining rate of phosphorus is 30%;
Five, add lime
In the supernatant liquor of flocculation basin 3, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator 7 to stir in flocculation basin 3, mixing parametric is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin 3, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 4 through the waste water of flocculation treatment, mud is from inclined-plate clarifying basin 4 following discharges, and supernatant liquor enters equalizing tank 5, and this moment, the mass concentration of phosphorus was 0.025mgL
-1, the clearance of phosphorus reaches 99.99%;
Nine, regulate pH
In equalizing tank 5, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
Embodiment four, a kind of treatment process of uranium-containing waste water, and the uranium concentration of uranium-containing waste water is 0.1～1000mgL
-1, its technical process is as follows:
One, adds except that the uranium agent
With sodium hydrogen phosphate by mass concentration ratio: uranium: sodium hydrogen phosphate=2～20: 1 directly adds removing in the uranium pond 1 in uranium-containing waste water;
Two, stir process
Use agitator 6 to stir to the uranium-containing waste water that adds sodium hydrogen phosphate in removing uranium pond 1, mixing parametric is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
After stirring the uranium-containing waste water that removes in the uranium pond 1 is carried out the sedimentation processing, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 2 through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin 3, and this moment, the uranium concentration of uranium waste water was 0.022mgL
-1, the uranium clearance reaches 99%, and the remaining rate of phosphorus is 30%;
Five, add lime
In the supernatant liquor of flocculation basin 3, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator 7 to stir in flocculation basin 3, mixing parametric is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carry out sedimentation after stirring and handle in flocculation basin 3, in 1: the ratio of 800-1000 adds polyacrylamide or bodied ferric sulfate;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin 4 through the waste water of flocculation treatment, mud is from inclined-plate clarifying basin 4 following discharges, and supernatant liquor enters equalizing tank 5, and this moment, the mass concentration of phosphorus was 0.025mgL
-1, the clearance of phosphorus reaches 99.99%;
Nine, regulate pH
In equalizing tank 5, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
Claims (3)
1, a kind of method of treatment process of uranium-containing waste water is characterized in that:
One, adds except that the uranium agent
Will except that the uranium agent by mass concentration ratio: uranium: remove uranium agent=2～20: 1 directly adds removing in the uranium pond in uranium-containing waste water;
Two, stir process
Use agitator to stir to the uranium-containing waste water that adds except that the uranium agent in removing the uranium pond, the agitation condition parameter is: churning time 30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Three, sedimentation is handled
Carrying out sedimentation after stirring in flocculation basin handles, sedimentation is handled can adopt natural subsidence or flocculating settling, the waste water natural subsidence of wherein not having other impurity is consuming time longer, by adding polymeric flocculant, can quicken the solution settling time, promote solid-liquid separation, flocculation agent by volume: flocculation agent: waste water=1: 800-1000 adds;
Four, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters flocculation basin;
Five, add lime
In the supernatant liquor of flocculation basin, continue to add the milk of lime clear liquor, adjust pH value to 9～12, phosphate radical residual in the waste water is precipitated out effectively;
Six, stir process
Use agitator to stir in flocculation basin, the agitation condition parameter is: churning time 10～30min, stirring velocity 250～300rpm, 10～30 ℃ of whipping temps;
Seven, sedimentation is handled
Carrying out sedimentation after stirring in flocculation basin handles, sedimentation is handled can adopt natural subsidence or flocculating settling, the waste water natural subsidence of wherein not having other impurity is consuming time longer, by adding polymeric flocculant, can quicken the solution settling time, promote solid-liquid separation, flocculation agent by volume: flocculation agent: waste water=1: 800-1000 adds;
Eight, solid-liquid separation
To carry out solid-liquid separation by inclined-plate clarifying basin through the waste water of flocculation treatment, mud is discharged from inclined-plate clarifying basin is following, and supernatant liquor enters equalizing tank;
Nine, regulate pH
In equalizing tank, supernatant liquor is added acid for adjusting pH to 6～9 back dischargings.
2, the treatment process of a kind of uranium-containing waste water as claimed in claim 1 is characterized in that: describedly remove the uranium agent and be: potassium primary phosphate, or SODIUM PHOSPHATE, MONOBASIC, or potassium hydrogen phosphate, or sodium hydrogen phosphate.
3, the treatment process of a kind of uranium-containing waste water as claimed in claim 1 or 2 is characterized in that: described flocculation agent is polyacrylamide or bodied ferric sulfate.
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