CN102849911A - Method for passivating and repairing cadmium-polluted volcano barrier lake bottom mud - Google Patents
Method for passivating and repairing cadmium-polluted volcano barrier lake bottom mud Download PDFInfo
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- CN102849911A CN102849911A CN2012103973367A CN201210397336A CN102849911A CN 102849911 A CN102849911 A CN 102849911A CN 2012103973367 A CN2012103973367 A CN 2012103973367A CN 201210397336 A CN201210397336 A CN 201210397336A CN 102849911 A CN102849911 A CN 102849911A
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Abstract
A method for passivating and repairing cadmium-polluted volcano dammed lake sediment relates to the field of methods for passivating and repairing cadmium-polluted lake sediment. The invention aims to solve the technical problems that the passivation operation is complex and the repair efficiency is not high on the premise of not changing the physicochemical property of the bottom mud in the existing passivation method. A method for passivating and repairing cadmium-polluted volcano barrier lake sediment comprises the following steps: firstly, preparing volcano dammed lake bottom mud particles, secondly, preparing Wudalianchi volcano rock particles, and thirdly, passivating and repairing the volcano dammed lake bottom mud particles by utilizing the Wudalianchi volcano rock particles. The method for passivating and repairing the cadmium-polluted volcano dammed lake bottom mud is simple to operate, and the fixation rate of the volcano dammed lake bottom mud to cadmium reaches over 48 percent. The invention is applied to the field of lake sediment recycling.
Description
Technical field
The present invention relates to the field of the method for the restoring cadmium polluted lakebed mud of passivation.
Background technology
Bottom mud in lake is carried out the developing direction that recycling is current scientific research, it is carried out " Fertilizer Transformed " utilizes more becomes current scientific research because meeting " resources sustainable development " focus.But because the phenomenon that current China lake ubiquity cadmium exceeds standard, using bed mud that cadmium exceeds standard can the deposits yields poisoning symptom be short and small such as: poor growth, plant to doing, atrophy and output degradation etc., and excessive cadmium can be residual in making object, harm humans is healthy, if can not get good processing, may cause secondary pollution to environment.In the various technology of current cadmium pollution in repairing bed mud, the passivation recovery technique is advantage such as easy, quick and effective and be subject to increasing attention with it, some novel materials begin to be used in the bed mud in the cadmium pollution passivation reparation research, and they have all obtained repairing effect to a certain degree under the lower level that adds.For dissimilar bottom mud in lake use identical passivator generally difficulty reach the reparation requirement, and need multiple passivator to unite use just to obtain preferably solution.In the existing passivating method, passivation operation is complicated, and the remediation efficiency under the prerequisite of the physico-chemical property that does not change bed mud is not high, and fixed rate only can reach 10% ~ 20%, can not satisfy the demand of the second stage employ of " Fertilizer Transformed ".
Summary of the invention
The present invention will solve in the existing passivating method, and passivation operation is complicated, the technical problem that the remediation efficiency under the prerequisite of the physico-chemical property that does not change bed mud is not high, and the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud is provided.
The method of the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.001mol/L ~ 0.1mol/L
3The aqueous solution is under the condition of 20 ℃ ~ 30 ℃ temperature, behind ultrasonic 2h ~ 5h under the ultrasonic frequency of 20kHz ~ 35kHz, leave standstill 20h ~ 30h, with the centrifugal 2min ~ 10min of the rotating speed of 1000r/min ~ 2000r/min, filter, obtain solid, namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:(0.005 ~ 0.03), NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is (5mL ~ 15mL): 1g.
Advantage of the present invention: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud has the following advantages:
One, the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation provided by the invention bed mud, process is simple, easy handling, cost is low, energy-conserving and environment-protective;
Two, the method of the restoring cadmium polluted volcanic dammed lake of a kind of passivation provided by the invention bed mud, what adopt is the fixedly cadmium of the attitude extracted in the bed mud of passivation cadmium pollution volcanic dammed lake of Wudalianchi Volcanic stone, because Wudalianchi Volcanic stone has huge specific surface area and abundant space on the one hand, the structures shape that it is special its have stronger adsorption and ion-exchange capacity, on the other hand, Wudalianchi Volcanic stone has strong basicity, can reduce the acidity of volcanic dammed lake bed mud, increase the pH value of volcanic dammed lake bed mud, and the adsorptive capacity of cadmium reduces with the increase of bed mud pH value in the bed mud, so that Wudalianchi Volcanic stone can effectively reduce the activity of cadmium in the bed mud;
Three, the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation provided by the invention bed mud, under the prerequisite of the physico-chemical property that does not change bed mud, fixed rate to cadmium in the bed mud of cadmium pollution volcanic dammed lake has reached more than 48%, can realize the second stage employ of volcanic dammed lake bed mud " Fertilizer Transformed ".
Embodiment
Embodiment one: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.001mol/L ~ 0.1mol/L
3The aqueous solution is under the condition of 20 ℃ ~ 30 ℃ temperature, behind ultrasonic 2h ~ 5h under the ultrasonic frequency of 20kHz ~ 35kHz, leave standstill 20h ~ 30h, with the centrifugal 2min ~ 10min of the rotating speed of 1000r/min ~ 2000r/min, filter, obtain solid, namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:(0.005 ~ 0.03), NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is (5mL ~ 15mL): 1g.
The method of the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud that present embodiment provides, when the pH of volcanic dammed lake bed mud value greater than 10 the time, because strong basicity, basic change has occured in the physico-chemical property of volcanic dammed lake bed mud, is not suitable for the second stage employ of " Fertilizer Transformed ".
The method of the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud that present embodiment provides, have the following advantages: one, process is simple, easy handling, cost is low, energy-conserving and environment-protective; Two, what adopt is the fixedly cadmium of the attitude extracted in the bed mud of passivation cadmium pollution volcanic dammed lake of Wudalianchi Volcanic stone, because Wudalianchi Volcanic stone has huge specific surface area and abundant space on the one hand, the structures shape that it is special its have stronger adsorption and ion-exchange capacity, on the other hand, Wudalianchi Volcanic stone has strong basicity, can reduce the acidity of volcanic dammed lake bed mud, increase the pH value of volcanic dammed lake bed mud, and the adsorptive capacity of cadmium reduces with the increase of bed mud pH value in the bed mud, so that Wudalianchi Volcanic stone can effectively reduce the activity of cadmium in the bed mud; Three, under the prerequisite of the physico-chemical property that does not change bed mud, (volcanized rock is to the fixed rate of cadmium=(C to the fixed rate of cadmium in the bed mud of cadmium pollution volcanic dammed lake
0-C
1)/C
0* 100%), C wherein
0The content of cadmium in the solution when not adding volcanized rock; C
1Content for cadmium in the solution behind the adding volcanized rock) reached more than 48%, can realize the second stage employ of volcanic dammed lake bed mud " Fertilizer Transformed ".
Embodiment two: the difference of present embodiment and embodiment one is: the temperature condition in the described step 3 is 23 ℃ ~ 27 ℃.Other is identical with embodiment one.
Embodiment three: present embodiment and embodiment one or twos' difference is: the temperature condition in the described step 3 is 25 ℃.Other is identical with embodiment one or two.
Embodiment four: the difference of one of present embodiment and embodiment one to three is: the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that the step 1 in the described step 3 obtains and step 2 obtain is 1:0.01.Other is identical with embodiment one to three.
Adopt following verification experimental verification effect of the present invention:
Test one: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with cadmium pollution volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.01mol/L
3The aqueous solution under the condition of 25 ℃ temperature, behind ultrasonic 3h under the ultrasonic frequency of 28kHz, leaves standstill 24h, with the centrifugal 5min of the rotating speed of 1500r/min, filters, and obtains the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:0.005, NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is 10mL:1g.
Other gets cadmium pollution volcanic dammed lake bed mud natural air drying, is screened to particle diameter and is not more than 2mm, obtains the volcanic dammed lake sediment particles, and adding concentration in the sediment particles of volcanic dammed lake is the NaNO of 0.01mol/L
3Aqueous solution 10mL under the condition of 25 ℃ temperature, behind ultrasonic 3h under the ultrasonic frequency of 28kHz, leaves standstill 24h, with the centrifugal 5min of the rotating speed of 1500r/min, filters, and obtains the volcanic dammed lake bed mud of not passivation.
Volcanic dammed lake bed mud to not passivation carries out the measurement of pH value, and getting not, the pH value of the volcanic dammed lake bed mud of passivation is 6.15.
To test in one after filtering resulting supernatant liquor of step 3, adopt the concentration of cadmium in the graphite furnace atomic absorption spectrometry supernatant liquor, calculate the fixed rate of cadmium, can obtain, when the mass ratio of the Wudalianchi Volcanic stone granulate that obtains when volcanic dammed lake sediment particles that step 1 obtains and step 2 is 1:0.005, be 48% through the restoring cadmium polluted volcanic dammed lake of passivation bed mud to the fixed rate of cadmium, at this moment, 6.15 before by the passivation of the pH value of volcanic dammed lake bed mud is increased to 7.30 after the passivation, the physico-chemical property of volcanic dammed lake bed mud does not change, and the volcanic dammed lake bed mud under this pH value is fit to the second stage employ of " Fertilizer Transformed ".
Test two: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.01mol/L
3The aqueous solution under the condition of 25 ℃ temperature, behind ultrasonic 3h under the ultrasonic frequency of 28kHz, leaves standstill 24h, with the centrifugal 5min of the rotating speed of 1500r/min, filters, and obtains solid, has namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:0.01, NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is 10mL:1g.
To test in two after filtering resulting supernatant liquor of step 3, adopt the concentration of cadmium in the graphite furnace atomic absorption spectrometry supernatant liquor, calculate the fixed rate of cadmium, can obtain, when the mass ratio of the Wudalianchi Volcanic stone granulate that obtains when volcanic dammed lake sediment particles that step 1 obtains and step 2 is 1:0.01, be 83% through the restoring cadmium polluted volcanic dammed lake of passivation bed mud to the fixed rate of cadmium, at this moment, 6.15 before by the passivation of the pH value of volcanic dammed lake bed mud is increased to 7.86 after the passivation, the physico-chemical property of volcanic dammed lake bed mud does not change, and the volcanic dammed lake bed mud under this pH value is fit to the second stage employ of " Fertilizer Transformed ".
Test three: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.01mol/L
3The aqueous solution under the condition of 25 ℃ temperature, behind ultrasonic 3h under the ultrasonic frequency of 28kHz, leaves standstill 24h, with the centrifugal 5min of the rotating speed of 1500r/min, filters, and obtains solid, has namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:0.03, NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is 10mL:1g.
To test in three after filtering resulting supernatant liquor of step 3, adopt the concentration of cadmium in the graphite furnace atomic absorption spectrometry supernatant liquor, calculate the fixed rate of cadmium, can obtain, when the mass ratio of the Wudalianchi Volcanic stone granulate that obtains when volcanic dammed lake sediment particles that step 1 obtains and step 2 is 1:0.03, be 92% through the restoring cadmium polluted volcanic dammed lake of passivation bed mud to the fixed rate of cadmium, at this moment, 6.15 before by the passivation of the pH value of volcanic dammed lake bed mud is increased to 9.07 after the passivation, the pH value is higher, make the physico-chemical property of volcanic dammed lake bed mud produce little change, this pH value is higher for the second stage employ of " Fertilizer Transformed " of volcanic dammed lake bed mud.
Test four: the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation bed mud, specifically finish according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.01mol/L
3The aqueous solution under the condition of 25 ℃ temperature, behind ultrasonic 3h under the ultrasonic frequency of 28kHz, leaves standstill 24h, with the centrifugal 5min of the rotating speed of 1500r/min, filters, and obtains solid, has namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:0.05, NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is 10mL:1g.
To test in four after filtering resulting supernatant liquor of step 3, adopt the concentration of cadmium in the graphite furnace atomic absorption spectrometry supernatant liquor, calculate the fixed rate of cadmium, can obtain, when the mass ratio of the Wudalianchi Volcanic stone granulate that obtains when volcanic dammed lake sediment particles that step 1 obtains and step 2 is 1:0.05, be 100% through the restoring cadmium polluted volcanic dammed lake of passivation bed mud to the fixed rate of cadmium.But the pH value of the volcanic dammed lake bed mud of this moment surpasses 10, and basic change has occured the physico-chemical property of volcanic dammed lake bed mud, and this pH value is so that the volcanic dammed lake bed mud is not suitable for the second stage employ of " Fertilizer Transformed ".
Claims (4)
1. the method for the restoring cadmium polluted volcanic dammed lake of a passivation bed mud is characterized in that the method for the restoring cadmium polluted volcanic dammed lake of passivation bed mud, specifically finishes according to the following steps:
One, with volcanic dammed lake bed mud natural air drying, then, be screened to particle diameter and be not more than 2mm, obtain the volcanic dammed lake sediment particles;
Two, get Wudalianchi Volcanic stone, pulverize, then, be screened to particle diameter and be not more than 80 orders, obtain the Wudalianchi Volcanic stone granulate;
Three, the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 is obtained and step 2 obtain mixes, and obtains mixture, and adding concentration in the mixture is the NaNO of 0.001mol/L ~ 0.1mol/L
3The aqueous solution is under the condition of 20 ℃ ~ 30 ℃ temperature, behind ultrasonic 2h ~ 5h under the ultrasonic frequency of 20kHz ~ 35kHz, leave standstill 20h ~ 30h, with the centrifugal 2min ~ 10min of the rotating speed of 1000r/min ~ 2000r/min, filter, obtain solid, namely finished the restoring cadmium polluted volcanic dammed lake of passivation bed mud; Wherein, the mass ratio of the Wudalianchi Volcanic stone granulate that the volcanic dammed lake sediment particles that step 1 obtains and step 2 obtain is 1:(0.005 ~ 0.03), NaNO
3The ratio of the quality of the volcanic dammed lake sediment particles that the volume of the aqueous solution and step 1 obtain is (5mL ~ 15mL): 1g.
2. the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation according to claim 1 bed mud is characterized in that the temperature condition in the described step 3 is 23 ℃ ~ 27 ℃.
3. the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation according to claim 1 and 2 bed mud is characterized in that the temperature condition in the described step 3 is 25 ℃.
4. the method for the restoring cadmium polluted volcanic dammed lake of a kind of passivation according to claim 1 and 2 bed mud is characterized in that the mass ratio of the Wudalianchi Volcanic stone granulate that volcanic dammed lake sediment particles that the step 1 in the described step 3 obtains and step 2 obtain is 1:0.01.
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| CN2012103973367A CN102849911A (en) | 2012-10-18 | 2012-10-18 | Method for passivating and repairing cadmium-polluted volcano barrier lake bottom mud |
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| CN2012103973367A CN102849911A (en) | 2012-10-18 | 2012-10-18 | Method for passivating and repairing cadmium-polluted volcano barrier lake bottom mud |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006080587A1 (en) * | 2005-01-31 | 2006-08-03 | Egs Company, Limited | Immobilizing agent and immobilization method for harmful component |
| JP2006263509A (en) * | 2005-03-22 | 2006-10-05 | Chugoku Electric Power Co Inc:The | Method for fixing substance easily eluted in water, and material obtained by it |
| CN101811133A (en) * | 2010-04-27 | 2010-08-25 | 河海大学 | Ultrasonic remediating method for heavy metal polluted soil/slurry |
| CN102432144A (en) * | 2011-11-01 | 2012-05-02 | 华南再生资源（中山）有限公司 | Method for preparing microporous adsorbent from sludge, product and special equipment |
-
2012
- 2012-10-18 CN CN2012103973367A patent/CN102849911A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006080587A1 (en) * | 2005-01-31 | 2006-08-03 | Egs Company, Limited | Immobilizing agent and immobilization method for harmful component |
| JP2006263509A (en) * | 2005-03-22 | 2006-10-05 | Chugoku Electric Power Co Inc:The | Method for fixing substance easily eluted in water, and material obtained by it |
| CN101811133A (en) * | 2010-04-27 | 2010-08-25 | 河海大学 | Ultrasonic remediating method for heavy metal polluted soil/slurry |
| CN102432144A (en) * | 2011-11-01 | 2012-05-02 | 华南再生资源（中山）有限公司 | Method for preparing microporous adsorbent from sludge, product and special equipment |
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Application publication date: 20130102 |