CN111807601A - Heavy metal wastewater treatment method and treatment system based on dynamic in-situ crystal nucleus growth mineralization - Google Patents
Heavy metal wastewater treatment method and treatment system based on dynamic in-situ crystal nucleus growth mineralization Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a heavy metal wastewater treatment method and a heavy metal wastewater treatment system based on dynamic in-situ crystal nucleus growth mineralization, wherein the treatment method comprises the following procedures: (1) circulating the wastewater containing heavy metal ions in Hcr reaction equipment and keeping the temperature at 40-100 ℃; (2) fully mixing the ferrous sulfate and the ferric sulfate with the wastewater; (3) after the wastewater is fully and uniformly mixed with ferrous sulfate and ferric sulfate, adding alkali liquor to adjust the pH value to a certain specific value so as to form colloidal precipitate; (4) keeping heating and circulating for 1 hour to promote the conversion of colloidal precipitate to crystal nucleus ore; and carrying out solid-liquid separation on the wastewater after the reaction. This patent technique improves reaction efficiency through forming optimized reaction environment to reach the minimizing of medicament addition and precipitate, mud resourceization and higher heavy metal clearance, realize better economy and environmental benefit with lower working costs finally.
Description
Technical Field
The invention relates to a wastewater treatment method and a wastewater treatment system for removing one or more heavy metal ions in wastewater containing heavy metal ions in the electronic industry.
Background
Heavy metal wastewater, i.e. various wastewater derived from heavy metals, the heavy metals in the traditional environmental field mainly refer to Hg, P ferric sulfate, Cd, Cr and metalloid ferrous sulfate s with heavy metal characteristics, and sometimes refer to general heavy metals such as Zn, Cu, Co, Ni, Sn and the like with certain toxicity. The industrial wastewater containing heavy metal ions mainly comes from electronics, machining, mining industry, steel and nonferrous metal smelting and part of chemical enterprises.
As a large country of industrial manufacture, the problem of heavy metal pollution faced by China is more and more serious. When the content of heavy metal in the organism reaches a certain value, the poisoning of the organism can be caused, when the heavy metal enters the human body and is accumulated to a certain content, a series of symptoms such as dizziness, nausea, arthralgia, amnesia and the like can appear on the human body, and therefore, the harm of the heavy metal to the human body including the organism is very large.
At present, heavy metal treatment generally adopts precipitation methods (such as neutralization, sulfide and ferrite coprecipitation, etc.), electrolysis methods, redox methods (such as ferrous sulfate N HSO3 method, FeSO4 method, SO2 method, scrap iron method, nano iron, etc.), membrane separation techniques (such as electrodialysis filter membrane, reverse osmosis filter membrane, extraction filter membrane, ultrafiltration filter membrane, etc.), ion exchange treatment methods (such as ion exchange resin, zeolite, etc. exchangers), biological purification treatment techniques (such as flocculation method, adsorption method, chemical method and plant restoration method), adsorption purification treatment methods (such as activated carbon, humic acid, sepiolite, chitosan resin, mesoporous materials, metal organic framework materials, etc.), heavy metal collectors (or chelating agents), electrocoagulation, etc.
In the existing treatment mode, the problems of large dosage of the added medicament, more formed precipitates, high discharge index standard-lifting pressure, high operation cost and the like generally exist.
Disclosure of Invention
The present invention has been made in an effort to provide a novel and improved method and system for treating wastewater, which can remove heavy metal ions contained in wastewater reliably at a lower cost regardless of the kind and concentration of the heavy metal ions contained in the wastewater, based on dynamic in-situ nucleation growth into an ore. The treatment system needs to solve the problems that crystal nuclei are formed and grow to a certain size, agglomeration phenomenon does not occur, heavy metal ions can enter an intercrystalline structure and are not dissolved out to enter a water body when environmental conditions change.
The purpose of the invention is realized by the following technical scheme.
The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization comprises the following steps:
(1) circulating the wastewater containing heavy metal ions in Hcr reaction equipment and keeping the temperature at 40-100 ℃;
(2) fully mixing the ferrous sulfate and the ferric sulfate with the wastewater;
(3) after the wastewater is fully and uniformly mixed with ferrous sulfate and ferric sulfate, adding alkali liquor to adjust the pH value to a certain specific value so as to form colloidal precipitate;
(4) keeping heating and circulating for 1 hour to promote the conversion of colloidal precipitate to crystal nucleus ore; and carrying out solid-liquid separation on the wastewater after the reaction.
In the process of the present invention, the treatment,
in the step (1), circulation of the Hcr reaction equipment at a flow rate of more than 3600L/h is ensured, and various heavy metal ions and various medicaments in the Hcr reaction equipment can be mixed more fully and uniformly.
In the step (1), keeping the temperature at 50 ℃; the temperature can be within 40-100 ℃, and 50 ℃ is selected in consideration of reaction efficiency and economic benefit;
in the step (2), ferrous sulfate is added firstly, and then ferric sulfate is added.
In the step (2), the optimal adding mode of the ferrous sulfate and the ferric sulfate is to dissolve the ferrous sulfate and the ferric sulfate in a certain amount of water for adding, so that the ferrous sulfate and the ferric sulfate can be fully mixed with the treated wastewater.
And (3) adding alkali liquor to adjust the pH value to 10-11, and converting various metal ions in the wastewater into hydroxide colloid precipitate, wherein the alkali liquor is prepared by sheet NaOH usually. And when the Hcr reaction equipment circulates at the flow rate of 3600L/h, colloidal precipitates can be ensured to exist in the Hcr reaction equipment in a very uniform mode and not to agglomerate, so that the subsequent conversion rate can be ensured.
According to the scheme of the invention, the temperature is maintained between 40 ℃ and 100 ℃ and the pH value is within the range of 10-11 in the whole process of treatment, and various colloidal precipitates are gradually converted into crystal nucleuses after 1 hour of reaction. The temperature must be maintained throughout the range 40-100 ℃ during the reaction time of 1 hour, ensured by means of external heating and heat preservation. Therefore, the rate of conversion of colloidal precipitate to crystal nucleus ore can be ensured, and the pH value adjusted by adding alkali liquor to be 10-11 is also a pH value range suitable for conversion of colloidal precipitate to crystal nucleus ore.
The Hcr reaction unit that mentions in this scheme can effectually avoid the colloid to deposit and hold the group to make more heavy metal ion can carry out the intercrystalline structure of crystal nucleus ore deposit, reach effective, stable effect of getting rid of heavy metal ion.
According to the scheme of the invention, most heavy metal ions can enter the intercrystalline structure of the crystal nucleus ore, are removed in a relatively stable crystal nucleus ore form, and cannot be dissolved out again into the water body when the environment changes.
And (4) separating the crystal nucleus ore from the wastewater by using a magnetic separation device.
The grain size of the crystal nucleus ore generated by the scheme is about 1 micron, and the crystal nucleus ore is a magnetic substance for recovery.
The Hcr reaction equipment used in the heavy metal wastewater treatment method comprises an outer cylinder of the reaction equipment, wherein the outer cylinder comprises a lower part with a smaller radius as a gravity recovery area and an upper part with a larger radius as an upper water outlet area; the diameter between the upper water outlet area and the gravity recovery area is reduced, and the outer diameter of the flow channel is larger than that of the flow channel in each area below the flow channel;
an inner cylinder is arranged in the outer cylinder and divides the outer cylinder into an inner flow field area and an outer flow field area; wherein, the inner flow field area is a main reaction area, and granular catalyst is put in the inner flow field area; a plurality of lateral control channels communicated with the outer flow field area are arranged on the side wall of the upper part of the inner cylinder; the lateral control channel is arranged above the gravity recovery area;
the bottom of the inner cylinder is provided with a flow guiding and water distributing device which is communicated with the water inlet and the inner cylinder, and the inner cylinder and the outer cylinder;
a flow limiting device for reducing the flow rate of liquid is arranged between the upper water outlet area and the gravity recovery area;
the top of the reaction equipment is also provided with a chemical adding port for adding chemicals and alkali, the outer side of the outer barrel of the gravity recovery area is provided with a circle of heating and heat-insulating device, the bottom of the reaction equipment is also provided with a solid discharging port, and the solid discharging port is provided with a magnetic separator.
The lateral control channels are provided with three groups which are uniformly arranged.
The method comprises the steps of heating the treated wastewater to 40-100 ℃ and keeping the temperature in the whole process, dissolving ferrous sulfate and ferric sulfate which are in a certain proportion to the treated metal ions, adding the dissolved ferrous sulfate and ferric sulfate into Hcr reaction equipment, reacting the ferrous sulfate, ferric sulfate and other heavy metal ions with alkali liquor to generate hydroxide colloidal precipitate, continuously reacting for 1 hour at a proper temperature and within a proper pH range, gradually converting the colloidal precipitate to crystal nucleus ores, and finally separating the crystal nucleus ores from the wastewater through a magnetic separator, so that the effect of stably removing the heavy metal ions at low cost is achieved, and a certain amount of the crystal nucleus ores can be recovered.
This patent technique improves reaction efficiency through forming optimized reaction environment to reach the minimizing of medicament addition and precipitate, mud resourceization and higher heavy metal clearance, realize better economy and environmental benefit with lower working costs finally.
Drawings
FIG. 1 is a schematic flow chart of a wastewater treatment method of the present invention
Fig. 1 includes the following steps: a step of circulating the wastewater in an Hcr reaction apparatus while maintaining the temperature at 50 ℃; fully mixing the ferrous sulfate and ferric sulfate (firstly adding the ferrous sulfate and then adding the ferric sulfate) with the wastewater; adding alkali liquor to adjust the pH value to a certain specific value after the wastewater is fully mixed with ferrous sulfate and ferric sulfate so as to form colloidal precipitate; maintaining the heating and circulating for 1 hour to promote the conversion of the colloidal precipitate to crystal nucleus ore; a step of subjecting the waste water after the reaction to solid-liquid separation
FIG. 2 is a schematic diagram showing the schematic constitution of the wastewater treatment method of the present invention
In fig. 2: 1. a lower water distribution area; 2. a primary reaction zone; 3. a gravity recovery zone; 4. an upper water outlet zone; 5. an outer cylinder; 6. inner cylinder, 7, lateral control channel; 8. a current limiting device; 9. a flow guiding and water distributing device; 10. an external dosing system; 11. a magnetic separator.
Detailed Description
In the following, preferred embodiments of the present invention will be described in detail, and it should be noted that the embodiments described below do not unduly limit the contents of the present invention described in the claims, and do not restrict all the configurations described in the embodiments to be necessarily the solutions of the present invention.
As shown in figure 1, the heavy metal wastewater treatment method based on dynamic in-situ nucleation growth mineralization comprises the following steps: (1) circulating the wastewater containing heavy metal ions in Hcr reaction equipment and keeping the temperature at 40-100 ℃; (2) fully mixing the ferrous sulfate and the ferric sulfate with the wastewater; (3) after the wastewater is fully and uniformly mixed with ferrous sulfate and ferric sulfate, adding alkali liquor to adjust the pH value to a certain specific value so as to form colloidal precipitate; (4) keeping heating and circulating for 1 hour to promote the conversion of colloidal precipitate to crystal nucleus ore; and carrying out solid-liquid separation on the wastewater after the reaction.
According to the invention, the Hcr reaction equipment is ensured to circulate at a flow rate of more than 3600L/h, and various heavy metal ions and various medicaments in the Hcr reaction equipment can be mixed more fully and uniformly. The temperature can be within 40-100 ℃, and 50 ℃ is selected in consideration of reaction efficiency and economic benefit;
in the step (2), ferrous sulfate is added firstly, and then ferric sulfate is added.
In the step (2), the optimal adding mode of the ferrous sulfate and the ferric sulfate is to dissolve the ferrous sulfate and the ferric sulfate in a certain amount of water for adding, so that the ferrous sulfate and the ferric sulfate can be fully mixed with the treated wastewater.
And (3) adding alkali liquor to adjust the pH value to 10-11, and converting various metal ions in the wastewater into hydroxide colloid precipitate, wherein the alkali liquor is prepared by sheet NaOH usually. And when the Hcr reaction equipment circulates at the flow rate of 3600L/h, colloidal precipitates can be ensured to exist in the Hcr reaction equipment in a very uniform mode and not to agglomerate, so that the subsequent conversion rate can be ensured.
And (4) separating the crystal nucleus ore from the wastewater by using a magnetic separation device.
The Hcr reaction equipment used in the heavy metal wastewater treatment method shown in FIG. 2 comprises an outer cylinder of the reaction equipment, wherein the outer cylinder comprises a lower part with a smaller radius as a gravity recovery area and an upper part with a larger radius as an upper water outlet area; the diameter between the upper water outlet area and the gravity recovery area is reduced, and the outer diameter of the flow channel is larger than that of the flow channel in each area below the flow channel; an inner cylinder is arranged in the outer cylinder and divides the outer cylinder into an inner flow field area and an outer flow field area; wherein, the inner flow field area is a main reaction area, and granular catalyst is put in the inner flow field area; a plurality of lateral control channels communicated with the outer flow field area are arranged on the side wall of the upper part of the inner cylinder; the lateral control channel is arranged above the gravity recovery area; the bottom of the inner cylinder is provided with a flow guiding and water distributing device which is communicated with the water inlet and the inner cylinder, and the inner cylinder and the outer cylinder; and a flow limiting device for reducing the flow rate of the liquid is arranged between the upper water outlet area and the gravity recovery area.
The top of the reaction equipment is also provided with a chemical adding port for adding chemicals and alkali, the outer side of the outer barrel of the gravity recovery area is provided with a circle of heating and heat-insulating device, the bottom of the reaction equipment is also provided with a solid discharging port, and the solid discharging port is provided with a magnetic separator.
In the invention, the team of the invention repeatedly and deeply researches and discovers that: when the electronic industry wastewater containing various heavy metal ions is treated, the wastewater is enabled to be at a specified circulating flow rate of 3600L/h, the temperature of the wastewater is ensured to be within a 50 ℃ interval, a certain amount of ferrous sulfate and ferric sulfate are added, then the PH is adjusted to a certain interval by adding alkali liquor, the heavy metal ions in the wastewater can form hydroxide colloidal precipitate, the hydroxide colloidal precipitate is reacted for a certain time under a proper condition, the colloidal precipitate can be converted into crystal nucleus ore, the form of the crystal nucleus ore can absorb the heavy metal ions into crystal nuclei, the effect of stably removing the heavy metal ions is achieved, the wastewater is purified, and the crystal nucleus ore can be recovered.
Therefore, in this embodiment, firstly, the treated wastewater is heated to 50 ℃, and after being pumped into the Hcr reaction equipment, circulation is started and the temperature is kept in a proper interval, and after 1 hour of reaction, the colloidal precipitate is converted into crystal nuclei by adding ferrous sulfate, ferric sulfate and alkali liquor, so that the heavy metal ions can be effectively removed, and finally, the crystal nuclei are separated and recovered.
The more thorough and uniform mixing of the materials is the basic condition for preventing the nucleation ore formation process from agglomeration.
In order to be able to convert the colloidal precipitate more rapidly into the nucleation ore, the pH is adjusted to a value in the range from 10 to 11, and the temperature is maintained at 50 ℃ for 1 hour of the entire reaction, this being achieved by external heating and heat-holding.
Theoretically, higher temperatures and longer reaction times could increase the efficiency of conversion of colloidal precipitates to nuclear ores to a greater extent.
As shown in fig. 2, we divided the Hcr reaction apparatus into four sections: firstly, a reaction part: 1. a lower water distribution area; 2. a primary reaction zone; 3. a gravity recovery zone; 4. an upper water outlet zone; 5. an outer cylinder; 6. inner cylinder, 7, lateral control channel; 8. a current limiting device; 9. a flow guiding and water distributing device; secondly, a medicine adding part; thirdly, heating and preserving heat; and fourthly, magnetically separating the parts.
The reaction part has the following functions: through Hcr response device's characteristic, can carry out effectual misce bene with the material in the reactor, for getting rid of heavy metal ion and provide necessary basic condition, the more abundant of mixing, can let more abundant of various material reactions, colloidal precipitation dispersion back simultaneously can avoid the agglomeration. However, to achieve the above functions, the circulation flow rate needs to be ensured to be above 3600L/h, the central cylindrical flow field area is a generation area for crystal nucleus formation and growth, ions of Fe3+ and Fe2+ are continuously added into the heavy metal wastewater in the area, the pH value of the water body is kept between 10 and 11, the temperature is 50 ℃, the flowing water body has the condition of forming tetrahedral ferrite in situ, metal ions contained in the wastewater, Fe3+ and Fe2+ cooperate to form pure ferrite consisting of iron elements and ferrite containing impurity metal elements, and the impurity elements enter an inter-crystal structure of the ferrite or form a ferrite structure in the process to form a stable substance structure, so that the heavy metal elements in the water are not easy to precipitate, and are effectively and stably removed. Meanwhile, the crystal nucleus formed in advance also becomes the crystal nucleus of the current ore formation, a new ferrite structure is formed on the surface of the crystal nucleus, and the crystal grains are promoted to grow to a certain granularity under the combined action of a fluid flow field, gravity and magnetic attraction of the crystal nucleus.
Secondly, the medicine adding part has the following functions: after the reaction part is ready, a certain amount of ferrous sulfate and ferric sulfate are added in sequence, after the ferrous sulfate and the ferric sulfate are added and mixed uniformly, the alkali liquor is added slowly, the PH is adjusted to 10-11 slowly, and the situation that the addition speed is too high to cause the pH to exceed the required range is cautiously prevented. The function of adding alkali liquor is to react with the original heavy metal ions, ferrous iron and ferric ions in the wastewater to generate hydroxide colloid precipitate for subsequent conversion into crystal nucleus ore.
Thirdly, the heating and heat preservation part has the following functions: firstly, the heating and heat preservation function can provide the temperature condition required by the reaction, and secondly, the temperature is required to be kept in an optimal interval within the time of 1 hour of the reaction so as to ensure the rate of the conversion of the colloidal precipitate to the crystal nucleus ore.
Fourthly, the magnetic separation part has the following functions: after the reaction, need to separate the crystal nucleus ore that has magnetism from waste water, timely branch can also guarantee that the heavy metal ion that can not enough get into the crystal nucleus can not dissolve out again and get back to the water to this waste water after guaranteeing to handle, heavy metal ion's concentration can keep at few content always.
As described above, in the wastewater treatment method and the wastewater treatment system according to the embodiment of the present invention, when treating wastewater in the electronic industry, which is difficult to treat in the conventional process, the patent technology improves the reaction efficiency by forming an optimized reaction environment, so as to minimize the amount of chemicals added and precipitates, recycle sludge, and increase the removal rate of heavy metals, and finally achieve better economic and environmental benefits at a lower operation cost.
The method for treating wastewater according to the present invention will be described in detail below with reference to specific examples. The present invention is not limited to these examples.
Example 1:
wastewater from a cleaning process was collected from a production line in the Suyang electronic operation in Jiangyin City, and an attempt was made to treat heavy metal ions Cu2+ in the wastewater by the wastewater treatment method according to the embodiment of the present invention.
The concentration of copper ions in the wastewater is about 300mg/L, PH is 10, 120L of wastewater is heated to about 50 ℃, then the wastewater is pumped into a reactor, a heating and heat-preserving system is opened, the temperature of the wastewater is kept within a 50 ℃ interval, the circulating flow of the reactor is controlled to be above 3600L/h, a certain amount of ferrous sulfate and ferric sulfate are dissolved, a dosing system is adopted to add into the reactor in sequence, after the ferrous sulfate, ferric sulfate and wastewater are fully mixed, alkali liquor is added through the dosing system to adjust the PH to 10-11, after reaction conditions are adjusted, on the premise that the temperature and the PH are kept unchanged, after 1 hour of reaction, precipitation is discharged from the lower part to a magnetic separation part, and crystal nucleus ore and wastewater are separated. The separated crystal nucleus ore can be recovered, and the supernatant adopts a novAA800 atomic absorption spectrometer to determine the content of copper ions, and the content is removed from 300mg/L to 0.07mg/L, which completely meets the national emission standard.
Example 2:
an attempt was made to collect cleaning process wastewater from a production line in operation of a certain electroplating plant in Shanghai, and to treat heavy metal ions Ni2+ in the wastewater by the wastewater treatment method according to the embodiment of the present invention.
The concentration of copper ions in the wastewater is about 55mg/L, PH is 6, 120L of wastewater is heated to about 50 ℃, then the wastewater is pumped into a reactor, a heating and heat-preserving system is opened, the temperature is kept between 45 ℃ and 55 ℃, the circulating flow of the reactor is controlled to be above 3600L/h, a certain amount of ferrous sulfate and ferric sulfate are dissolved, a dosing system is adopted to be sequentially added into the reactor, after the ferrous sulfate, the ferric sulfate and the wastewater are fully mixed, alkali liquor is added through the dosing system to adjust the PH to be between 8 and 9, after reaction conditions are well adjusted, on the premise that the temperature and the PH are kept unchanged, after 1 hour of reaction, precipitation is discharged from the lower part to a magnetic separation part, and crystal nucleus ore and the wastewater are separated. The separated crystal nucleus ore can be recovered, the supernatant adopts a novAA800 atomic absorption spectrometer to determine the content of copper ions, and the copper ions are removed from 55mg/L until the copper ions can not be detected by the atomic absorption spectrometer, thereby meeting the national emission standard.
While the embodiments and examples of the present invention have been described in detail, it will be readily apparent to those skilled in the art that various modifications can be made without actually departing from the specific technical features and effects of the present invention. Therefore, all such modifications are included in the scope of the present invention.
For example, in the specification or the drawings, a term described in conjunction with a different term having a broader meaning or the same meaning can be replaced with the different term at least once at any position in the specification or the drawings. The configuration and operation of the wastewater treatment method and wastewater treatment system are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.
Claims (10)
1. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization is characterized by comprising the following steps of:
(1) circulating the wastewater containing heavy metal ions in Hcr reaction equipment and keeping the temperature at 40-100 ℃;
(2) fully mixing the ferrous sulfate and the ferric sulfate with the wastewater;
(3) after the wastewater is fully and uniformly mixed with ferrous sulfate and ferric sulfate, adding alkali liquor to adjust the pH value to a certain specific value so as to form colloidal precipitate;
(4) keeping heating and circulating for 1 hour to promote the conversion of colloidal precipitate to crystal nucleus ore; and carrying out solid-liquid separation on the wastewater after the reaction.
2. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: in the step (1), the Hcr reaction equipment is circulated at a flow rate of 3600L/h or more, so that various heavy metal ions and various medicaments in the Hcr reaction equipment can be mixed more fully and uniformly.
3. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: in step (1), the temperature was maintained at 50 ℃.
4. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: in the step (2), ferrous sulfate is added firstly, and then ferric sulfate is added.
5. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: in the step (2), the optimal adding mode of the ferrous sulfate and the ferric sulfate is to dissolve the ferrous sulfate and the ferric sulfate in a certain amount of water for adding, so that the ferrous sulfate and the ferric sulfate can be fully mixed with the treated wastewater.
6. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: and (3) adding alkali liquor to adjust the pH value to 10-11, and converting various metal ions in the wastewater into hydroxide colloid precipitate, wherein the alkali liquor is prepared by sheet NaOH usually.
7. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: and (4) separating the crystal nucleus ore from the wastewater by using a magnetic separation device.
8. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to claim 1, characterized in that: the grain size of the generated crystal nucleus ore is about 1 micron, and the crystal nucleus ore is a magnetic substance for recycling.
9. The heavy metal wastewater treatment method based on dynamic in-situ crystal nucleus growth mineralization according to any one of claims 1, characterized in that: the Hcr reaction equipment used in the heavy metal wastewater treatment method comprises an outer cylinder of the reaction equipment, wherein the outer cylinder comprises a lower part with a smaller radius as a gravity recovery area and an upper part with a larger radius as an upper water outlet area; the diameter between the upper water outlet area and the gravity recovery area is reduced, and the outer diameter of the flow channel is larger than that of the flow channel in each area below the flow channel;
an inner cylinder is arranged in the outer cylinder and divides the outer cylinder into an inner flow field area and an outer flow field area; wherein, the inner flow field area is a main reaction area, and granular catalyst is put in the inner flow field area; a plurality of lateral control channels communicated with the outer flow field area are arranged on the side wall of the upper part of the inner cylinder; the lateral control channel is arranged above the gravity recovery area;
the bottom of the inner cylinder is provided with a flow guiding and water distributing device which is communicated with the water inlet and the inner cylinder, and the inner cylinder and the outer cylinder;
a flow limiting device for reducing the flow rate of liquid is arranged between the upper water outlet area and the gravity recovery area;
the top of the reaction equipment is also provided with a chemical adding port for adding chemicals and alkali, the outer side of the outer barrel of the gravity recovery area is provided with a circle of heating and heat-insulating device, the bottom of the reaction equipment is also provided with a solid discharging port, and the solid discharging port is provided with a magnetic separator.
10. The heavy metal wastewater treatment method based on dynamic in-situ nucleation for ore formation according to any one of claim 9, wherein: the lateral control channels are provided with three groups which are uniformly arranged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112358023A (en) * | 2020-11-19 | 2021-02-12 | 神美科技有限公司 | Heavy metal remover |
| CN116282454A (en) * | 2023-04-27 | 2023-06-23 | 中国天辰工程有限公司 | System and method for neutralizing waste water of POSM device |
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