CN111977919A - Method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation - Google Patents
Method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation Download PDFInfo
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- CN111977919A CN111977919A CN202010623117.0A CN202010623117A CN111977919A CN 111977919 A CN111977919 A CN 111977919A CN 202010623117 A CN202010623117 A CN 202010623117A CN 111977919 A CN111977919 A CN 111977919A
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- heavy metal
- bottom mud
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/15—Treatment of sludge; Devices therefor by de-watering, drying or thickening by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation. The method comprises the following steps: pre-acidifying the bottom mud, extracting by ultrasonic wave, drying and dehydrating the bottom mud, chemically precipitating the extracting solution, recycling acid and the like. Pre-acidifying the bottom sludge, adding a complexing agent, and separating out heavy metals in the sludge from the bottom sludge through chemical dissolution and effective complexing under the action of ultrasonic waves; the purified bottom mud can be safely disposed or utilized after dehydration and drying; and (4) neutralizing and chemically precipitating the precipitated liquid, and continuously recycling the supernatant for the heavy metal extraction process of the acidified sludge. The invention has reasonable process route, moderate operation cost, module integration and convenient movement of the device, can effectively purify sludge polluted by heavy metal, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of bottom sludge heavy metal pollution treatment equipment, in particular to a method for treating heavy metal pollution bottom sludge by utilizing ultrasonic wave-composite acid extraction-chemical precipitation.
Background
With the deepening of the treatment work of black and odorous water in China, the treatment and disposal of the bottom mud polluted by heavy metal become a new technical work. The landfill has the problems of large occupied area, heavy metal content, low utilization rate, leachate pollution to underground water, high subsequent treatment and management cost and the like, and the application is limited. China is a developing agricultural big country, the economic foundation is not overly thick, and the bottom mud is reasonably reused in farmlands, tree planting and afforestation, landscaping, wasteland reclamation, barren lands and the like as a main effective utilization way after being removed with heavy metals.
Heavy metals are pollutants which are extremely harmful to the ecological environment, and can not be biodegraded after entering the environment, but often participate in food chain circulation and finally accumulate in organisms, damage normal physiological metabolic activities of the organisms and harm human health; on the other hand, with the development of industry, heavy metals are more and more widely used, so that the relative shortage of heavy metal resources is caused. Therefore, how to remove heavy metals from the bottom mud and effectively recycle them is a prominent problem in the environmental protection field today.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation, which comprises the following steps: pre-acidifying the bottom mud, extracting by ultrasonic wave, drying and dehydrating the bottom mud, chemically precipitating the extracting solution, recycling acid and the like. The process composition is reasonable, heavy metals in the polluted bottom mud can be effectively removed, the heavy metals in the waste liquid can be precipitated and recycled by an extractor, and the treatment cost is more reasonable than that of the existing chemical treatment method.
In order to achieve the above object, the technical solution adopted by the present invention is as follows:
(1) conveying the bottom sludge into an acidification extraction reactor by using a sludge pump, adding sulfuric acid to adjust the pH value to be medium-strong acid, adding a citric acid complexing agent to stir and mix, and separating heavy metals in the bottom sludge from the bottom sludge by virtue of ultrasonic wave synergistic action;
(2) the treated bottom mud is dehydrated and dried, and can be utilized after different conditioning;
(3) the extracting solution after mud-water separation contains citric acid heavy metal complex, after calcium salt and sulfide are added for reaction and precipitation, heavy metal is converted into inorganic binding state, and citrate is continuously kept in liquid phase;
(4) performing secondary precipitation separation and dehydration to obtain sludge rich in heavy metals, and finally safely disposing the sludge or using the sludge as a raw material for re-smelting the heavy metals;
(5) adjusting pH of the supernatant of the secondary precipitation with sulfuric acid, and supplementing part of citric acid for extraction.
Preferably, the pH value is adjusted to be between 3.0 and 4.0 in the pre-acidification process, and the acid for pre-acidification can be concentrated nitric acid, concentrated hydrochloric acid and concentrated sulfuric acid.
In the method, the heavy metal complexing agent is added for complexing after pre-acidification, and the complexing agent is a citric acid complexing agent.
In the method, the pre-acidified, complexly leached bottom mud is dehydrated and dried by a screw stacking machine.
In the above method, the extract solution after mud-water separation contains citric acid heavy metal complex, and after adding calcium salt and sulfide precipitant to react and precipitate, the heavy metal is converted into inorganic binding state, wherein the calcium salt is Ca (OH)2CaO or CaCl2The sulfide precipitant is sodium sulfide.
In the method, the supernatant fluid after secondary precipitation separation and heavy metal removal is acidified by adjusting the pH value to 4.0 and then regenerated.
Preferably, the acidifying regeneration agent is concentrated nitric acid, concentrated hydrochloric acid or concentrated sulfuric acid.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the invention adopts a pre-acidification-citric acid complexing agent-ultrasonic extraction method, can efficiently extract heavy metals in the bottom sediment, detoxicates the polluted bottom sediment, and recycles the polluted bottom sediment after proper conditioning for planting. The defect of large land occupation of a low-cost landfill method is avoided.
2. Heavy metals extracted by complexation are precipitated and separated by calcium salt-sulfide, so that the volume of heavy metal hazardous waste is reduced to the maximum extent, the hazardous waste treatment company can conveniently carry out final treatment, and the heavy metal mineral source can also be used as a heavy metal mineral source for re-smelting, thereby relieving the increasing shortage of the heavy metal mineral source.
3. The extracting solution after mud-water separation contains citric acid heavy metal complex, calcium salt and sulfide are added for reaction and precipitation, heavy metal is converted into an inorganic combined state, citrate in the liquid phase is continuously kept in the liquid phase, the pH value is adjusted by sulfuric acid, part of citric acid is supplemented and then is reused in the extraction process, the using amount of the citric acid complex is reduced, and the whole treatment cost is greatly reduced.
In conclusion, the invention has clear technical thought, reasonable process route and moderate operation cost; the bottom sludge purification system can realize module integration and convenient movement, can effectively purify sludge polluted by heavy metals, and has good application prospect.
Moreover, the system and the device can also be applied to the remediation of the heavy metal contaminated soil, the contaminated soil can be mixed with water and then conveyed to the system for purification by a pump, and the system and the device have strong applicability in the field of remediation of the heavy metal contaminated soil, have good environmental benefit and social benefit and have wide market popularization prospect.
Detailed Description
A method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation, which comprises the following steps: pre-acidifying the bottom mud, extracting by ultrasonic wave, drying and dehydrating the bottom mud, chemically precipitating the extracting solution, recycling acid and the like. Conveying the bottom sludge into an acidification extraction reactor by using a sludge pump, adding sulfuric acid to adjust the pH value to be medium-strong acid, adding a citric acid complexing agent to stir and mix, and separating heavy metals in the bottom sludge from the bottom sludge by virtue of ultrasonic wave synergistic action; the treated bottom mud is dehydrated and dried, and can be utilized after different conditioning; the extracting solution after mud-water separation contains citric acid heavy metal complex, after calcium salt and sulfide are added for reaction and precipitation, heavy metal is converted into inorganic binding state, and citrate is continuously kept in liquid phase; performing secondary precipitation separation and dehydration to obtain sludge rich in heavy metals, and finally safely disposing the sludge or using the sludge as a raw material for re-smelting the heavy metals; adjusting pH of the supernatant of the secondary precipitation with sulfuric acid, and supplementing part of citric acid for extraction.
Preferably, the pH value is adjusted to be between 3.0 and 4.0 in the pre-acidification process, and the acid for pre-acidification can be concentrated nitric acid, concentrated hydrochloric acid and concentrated sulfuric acid.
In the method, the heavy metal complexing agent is added for complexing after pre-acidification, and the complexing agent is a citric acid complexing agent.
In the method, the pre-acidified, complexly leached bottom mud is dehydrated and dried by a screw stacking machine.
In the above method, the extract solution after mud-water separation contains citric acid heavy metal complex, and after adding calcium salt and sulfide precipitant to react and precipitate, the heavy metal is converted into inorganic binding state, wherein the calcium salt is Ca (OH)2CaO or CaCl2The sulfide precipitant is sodium sulfide.
In the method, the supernatant fluid after the secondary precipitation separation and the heavy metal removal is acidified and regenerated after the pH value is adjusted to 4.0, and the acidification regeneration medicament is concentrated nitric acid, concentrated hydrochloric acid or concentrated sulfuric acid.
Claims (6)
1. A method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation is characterized by comprising the following steps: pre-acidifying the bottom sludge, adding a complexing agent, and separating out heavy metals in the sludge from the bottom sludge through chemical dissolution and effective complexing under the action of ultrasonic waves; the purified bottom mud can be safely disposed or utilized after dehydration and drying; and (4) neutralizing and chemically precipitating the precipitated liquid, and continuously recycling the supernatant for the heavy metal extraction process of the acidified sludge.
2. The method for treating the heavy metal polluted bottom mud by utilizing the ultrasonic wave-composite acid extraction-chemical precipitation as claimed in claim 1, is characterized in that: the pH value is adjusted to be 3.0-4.0 in the pre-acidification process, and the acid for pre-acidification can be concentrated nitric acid, concentrated hydrochloric acid and concentrated sulfuric acid.
3. The method for treating the heavy metal polluted bottom mud by utilizing the ultrasonic wave-composite acid extraction-chemical precipitation as claimed in claim 1, is characterized in that: and adding a heavy metal complexing agent for complexing after pre-acidification, wherein the complexing agent is a citric acid complexing agent.
4. The method for treating the heavy metal polluted bottom mud by utilizing the ultrasonic wave-composite acid extraction-chemical precipitation as claimed in claim 1, is characterized in that: dehydrating and drying the pre-acidified, complexed and leached bottom mud by a screw stacking machine.
5. The method for treating the heavy metal polluted bottom mud by utilizing the ultrasonic wave-composite acid extraction-chemical precipitation as claimed in claim 1, is characterized in that: the extract after mud-water separation contains citric acid heavy metal complex, and after adding calcium salt and sulfide precipitator for reaction and precipitation, the heavy metal is converted into inorganic binding state, wherein the calcium salt is Ca (OH)2CaO or CaCl2The sulfide precipitant is sodium sulfide.
6. The method for treating the heavy metal polluted bottom mud by utilizing the ultrasonic wave-composite acid extraction-chemical precipitation as claimed in claim 1, is characterized in that: and adjusting the pH of the supernatant fluid subjected to secondary precipitation separation and heavy metal removal to 4.0, and then, acidifying and regenerating, wherein the acidification and regeneration agent is concentrated nitric acid, concentrated hydrochloric acid or concentrated sulfuric acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010623117.0A CN111977919A (en) | 2020-06-30 | 2020-06-30 | Method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation |
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| CN202010623117.0A CN111977919A (en) | 2020-06-30 | 2020-06-30 | Method for treating heavy metal polluted bottom mud by utilizing ultrasonic wave-composite acid extraction-chemical precipitation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112520961A (en) * | 2020-11-30 | 2021-03-19 | 武汉森泰环保股份有限公司 | Method for treating concentrated excess sludge |
| CN113367227A (en) * | 2021-03-23 | 2021-09-10 | 江苏大学 | Method for simultaneously extracting nannochloropsis oculata protein and dietary fiber by using ultrasonic wave assistance |
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| CN104386889A (en) * | 2014-06-09 | 2015-03-04 | 何晋勇 | Efficient leaching processing method for composite heavy-metal-polluted bottom sediment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112520961A (en) * | 2020-11-30 | 2021-03-19 | 武汉森泰环保股份有限公司 | Method for treating concentrated excess sludge |
| CN113367227A (en) * | 2021-03-23 | 2021-09-10 | 江苏大学 | Method for simultaneously extracting nannochloropsis oculata protein and dietary fiber by using ultrasonic wave assistance |
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