CN112520810A - Heavy metal capturing material and application thereof - Google Patents
Heavy metal capturing material and application thereof Download PDFInfo
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- CN112520810A CN112520810A CN202011290985.8A CN202011290985A CN112520810A CN 112520810 A CN112520810 A CN 112520810A CN 202011290985 A CN202011290985 A CN 202011290985A CN 112520810 A CN112520810 A CN 112520810A
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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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
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- Environmental & Geological Engineering (AREA)
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- Inorganic Chemistry (AREA)
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a heavy metal capturing material and application thereof, wherein the heavy metal capturing material comprises the following raw materials in percentage by mass: 9-12% of a porous adsorption material, 8-11% of mercaptan, 1-4% of an inorganic sulfide, 5-9% of caustic alkali, 3-7% of sodium diethyldithiocarbamate, 4-7% of ammonium dithiocarbamate and the balance of water. The heavy metal capturing material is mainly used for treating industrial wastewater containing heavy metal ions, the generated precipitate particles are large, the settling speed is high, and the concentration of the heavy metal ions (Cu) in the wastewater is easy to be caused2+、Ni+、Pb2+、Hg2+、Zn2+、Cd2+) The obtained residue can be recovered heavy metal without reaching the national discharge standardThe secondary pollution is easy to generate, and the generation of hydrogen sulfide can be effectively reduced.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a heavy metal capture material and application thereof.
Background
In recent years, with the continuous acceleration of urbanization level in China, the discharge amount of waste water is increasingly increased, so that the environment is seriously polluted. Various harmful substances in the wastewater are enriched into a biological chain through a water body and finally enter a human body to bring serious toxic and harmful effects to human beings. Wherein, the heavy metal ions contained in the wastewater are one of the harmful substances which cause the most serious environmental pollution and have the greatest harm to the human health. Therefore, how to treat heavy metal wastewater has been generally regarded by various fields.
At present, effective separation processes for removing heavy metal ions in wastewater are as follows: ion exchange, electrochemical treatment, membrane technology, evaporative coagulation, precipitation, reverse osmosis, electrodialysis, etc., but the wide application of these technologies is sometimes limited by process and economics. Therefore, the problem of seeking a cheap sewage heavy metal capturing and purifying material to reduce the sewage treatment cost and improve the purification efficiency becomes an urgent solution in environmental protection.
In recent years, heavy metal capture materials have become research hotspots, and the existing heavy metal capture materials mainly adopt alkaline chemical substances such as sodium sulfide, sodium hydroxide, lime and the like to treat wastewater, and remove heavy metal ions by forming corresponding heavy metal hydroxide precipitates. However, since zinc hydroxide is an amphoteric hydroxide, it is dissolved at high alkalinity, and the zinc ion does not meet the emission requirement. And the sodium sulfide can generate hydrogen sulfide odor during precipitation, oxidation side reaction can occur during dissolution, and the heavy metal sulfide precipitation floc particles are fine, the settling time is too long, and the like, so that the removal effect of heavy metal ions is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a heavy metal capture material and application thereof. The heavy metal catching material prepared by the invention can react with heavy metal at normal temperature to generate larger-particle sediment, and the aim of removing heavy metal ions can be achieved through flocculation sedimentation and solid-liquid separation. The heavy metal capture material prepared by the invention has the advantages of simple preparation process, simple and convenient use and excellent treatment effect, can be used independently, can also be used in combination with other water treatment agents, and has better application prospect and market prospect.
The heavy metal capturing material comprises the following raw materials in percentage by mass:
9-12% of a porous adsorption material, 8-11% of mercaptan, 1-4% of an inorganic sulfide, 5-9% of caustic alkali, 3-7% of sodium diethyldithiocarbamate, 4-7% of ammonium dithiocarbamate and the balance of water.
More preferably, the porous adsorbent comprises 10% of mercaptan, 10% of inorganic sulfide, 8% of caustic alkali, 5% of sodium diethyldithiocarbamate, 5% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material comprises at least three of ultrafine fly ash, diatomite, zeolite powder, corncob powder, attapulgite and sepiolite powder which are mixed, and the components are equal in mass.
The mercaptan comprises 1-propyl mercaptan and 2, 3-dimercaptopropanol which are mixed and formed, and the components are equal in mass.
The inorganic sulfide is formed by mixing sodium sulfide and sodium thiosulfate, and the components are equal in mass.
The caustic alkali is one or two of sodium hydroxide and potassium hydroxide.
The heavy metal capturing material is obtained by a method comprising the following steps:
step 1: putting the porous adsorption material and caustic alkali into a stirrer according to a ratio, adding water 1-2 times of the total weight of the mixture, and stirring and reacting at 45-60 ℃ at a rotating speed of 180-240 rpm for 2-3 hours to obtain a modified porous adsorption material;
step 2: putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to a ratio, adding water which is 0.8-1 time of the total weight of the mixture, and stirring and reacting at the temperature of 40-50 ℃ at the rotating speed of 180-240 rpm for 1-1.5 hours to obtain a heavy metal capture material intermediate product;
and step 3: and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali (the part of the added caustic alkali is not counted in the proportion of the raw materials) to adjust the pH value of the system to 12-13, so as to obtain the heavy metal capture material.
The application method of the heavy metal capturing material of the invention is that the heavy metal capturing material is added according to the proportion of 0.1-0.5kg/m3The heavy metal ions in the industrial wastewater are removed by flocculation precipitation and solid-liquid separation.
The heavy metal ions comprise Cu2+、Ni+、Pb2+、Hg2+、Zn2+、Co2+And the like.
Compared with the prior art, the invention has the beneficial effects that:
the heavy metal capturing material prepared by the invention is mainly used for treating industrial wastewater containing heavy metal ions, can react with heavy metals at normal temperature to generate precipitate with larger particles, and can achieve the aim of removing the heavy metal ions through flocculation precipitation and solid-liquid separation. And the generated precipitate particles are large, the settling speed is high, and the concentration of heavy metal ions (Cu) in the wastewater is easy to cause2+、Ni+、Pb2+、Hg2+、Zn2+、Co2+) The emission standard of the product reaches below the national emission standard. Meanwhile, the generated residues can recover heavy metals, secondary pollution is not easy to generate, and the generation of hydrogen sulfide is effectively reduced. The heavy metal capture material prepared by the invention has the advantages of simple preparation process, simple and convenient use and excellent treatment effect, can be used independently, can also be used in combination with other water treatment agents, and has better application prospect and market prospect.
Detailed Description
The present invention will be further described below, and it should be noted that the present embodiment is based on the technical solution, and a detailed implementation manner and a specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
The heavy metal capturing material comprises, by mass, 9-12% of a porous adsorbing material, 8-11% of mercaptan, 1-4% of an inorganic sulfide, 5-9% of caustic alkali, 3-7% of sodium diethyldithiocarbamate, 4-7% of ammonium dithiocarbamate and the balance of water.
More preferably: 10% of porous adsorption material, 10% of mercaptan, 2% of inorganic sulfide, 8% of caustic alkali, 5% of sodium diethyldithiocarbamate, 5% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material comprises at least three of ultrafine fly ash, diatomite, zeolite powder, corncob powder, attapulgite and sepiolite powder which are mixed, and the components are equal in mass.
The mercaptan comprises 1-propyl mercaptan and 2, 3-dimercaptopropanol which are mixed and formed, and the components are equal in mass.
The inorganic sulfide is formed by mixing sodium sulfide and sodium thiosulfate, and the components are equal in mass.
The caustic alkali is one or two of sodium hydroxide and potassium hydroxide.
The heavy metal capture material is obtained by a method comprising the following steps:
step 1: putting the porous adsorption material and caustic alkali into a stirrer according to a ratio, adding water 1-2 times of the total weight of the mixture, and stirring and reacting at 45-60 ℃ at a rotating speed of 180-240 rpm for 2-3 hours to obtain a modified porous adsorption material;
step 2: putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to a ratio, adding water which is 0.8-1 time of the total weight of the mixture, and stirring and reacting at the temperature of 40-50 ℃ at the rotating speed of 180-240 rpm for 1-1.5 hours to obtain a heavy metal capture material intermediate product;
and step 3: and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to adjust the pH value of the system to be 12-13, so as to obtain the heavy metal capture material.
The application method of the heavy metal capturing material of the invention is that the heavy metal capturing material is added according to the proportion of 0.1-0.5kg/m3The heavy metal ions in the industrial wastewater are removed by flocculation precipitation and solid-liquid separation.
The heavy metal ions comprise Cu2+、Ni+、Pb2+、Hg2+、Zn2+、Co2+And the like.
Example 1:
the heavy metal capturing material comprises, by mass, 10% of a porous adsorbing material, 10% of mercaptan, 2% of an inorganic sulfide, 8% of caustic alkali, 5% of sodium diethyldithiocarbamate, 5% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material is formed by mixing ultrafine fly ash, diatomite and zeolite powder, and the components are equal in mass.
The caustic is sodium hydroxide.
The preparation method of the heavy metal capture material comprises the following steps: putting the porous adsorption material and caustic alkali into a stirrer according to the proportion, adding water 2 times of the total weight of the mixture, and stirring and reacting for 3 hours at the temperature of 60 ℃ at the rotating speed of 200rpm to obtain a modified porous adsorption material; putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to the proportion, adding 1 time of water of the total weight of the mixture, stirring and reacting for 1.5 hours at the temperature of 50 ℃ and at the rotating speed of 200rpm to obtain a heavy metal capture material intermediate product; and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to enable the pH of the solution to be 12-13, so as to obtain the heavy metal capture material. At a rate of 0.25kg/m3The addition amount of (2) is added into electroplating wastewater of a certain company (total copper is 33.8mg/L, chromium with 3 valence is 58.3mg/L, total nickel is 19.8mg/L, and total zinc is 21.5mg/L), the mixture is stirred uniformly and then stands, and the supernatant is taken for data monitoring, and the detection results are shown in the following table.
Example 2:
the heavy metal capturing material prepared by the invention comprises, by mass, 12% of a porous adsorbing material, 11% of mercaptan, 1% of inorganic sulfide, 5% of caustic alkali, 3% of sodium diethyldithiocarbamate, 4% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material is formed by mixing diatomite, attapulgite and sepiolite powder, and the components are equal in mass.
The caustic is potassium hydroxide.
The preparation method of the heavy metal capture material comprises the following steps: putting the porous adsorption material and caustic alkali into a stirrer according to the proportion, adding water 2 times of the total weight of the mixture, and stirring and reacting for 2 hours at the temperature of 45 ℃ at the rotating speed of 180rpm to obtain a modified porous adsorption material; putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to the proportion, adding 1 time of water of the total weight of the mixture, and stirring and reacting for 1 hour at the temperature of 40 ℃ and the rotating speed of 180rpm to obtain a heavy metal capture material intermediate product; and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to enable the pH of the solution to be 12-13, so as to obtain the heavy metal capture material. At a rate of 0.1kg/m3The addition amount of (2) is added into electroplating wastewater of a certain company (total copper is 33.8mg/L, chromium with 3 valence is 58.3mg/L, total nickel is 19.8mg/L, and total zinc is 21.5mg/L), the mixture is stirred uniformly and then stands, and the supernatant is taken for data monitoring, and the detection results are shown in the following table.
Example 3:
the heavy metal capturing material comprises, by mass, 12% of a porous adsorbing material, 11% of mercaptan, 4% of an inorganic sulfide, 9% of caustic alkali, 3% of sodium diethyldithiocarbamate, 4% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material is formed by mixing ultrafine fly ash, diatomite and zeolite powder, and the components are equal in mass.
The caustic is sodium hydroxide.
The preparation method of the heavy metal capture material comprises the following steps: putting the porous adsorption material and caustic alkali into a stirrer according to the proportion, and adding and mixingStirring and reacting water which is 2 times of the total weight of the material for 3 hours at the temperature of 60 ℃ and at the rotating speed of 200rpm to obtain a modified porous adsorption material; putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to the proportion, adding 1 time of water of the total weight of the mixture, stirring and reacting for 1.5 hours at the temperature of 50 ℃ and at the rotating speed of 200rpm to obtain a heavy metal capture material intermediate product; and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to enable the pH of the solution to be 12-13, so as to obtain the heavy metal capture material. At a rate of 0.5kg/m3The addition amount of (2) is added into electroplating wastewater of a certain company (total copper is 33.8mg/L, chromium with 3 valence is 58.3mg/L, total nickel is 19.8mg/L, and total zinc is 21.5mg/L), the mixture is stirred uniformly and then stands, and the supernatant is taken for data monitoring, and the detection results are shown in the following table.
Example 4:
the heavy metal capturing material comprises, by mass, 9% of a porous adsorbing material, 8% of mercaptan, 1% of an inorganic sulfide, 5% of caustic alkali, 7% of sodium diethyldithiocarbamate, 7% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material is formed by mixing ultrafine fly ash, diatomite and zeolite powder, and the components are equal in mass.
The caustic is sodium hydroxide.
The preparation method of the heavy metal capture material comprises the following steps: putting the porous adsorption material and caustic alkali into a stirrer according to the proportion, adding water 2 times of the total weight of the mixture, and stirring and reacting for 3 hours at the temperature of 60 ℃ at the rotating speed of 200rpm to obtain a modified porous adsorption material; putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to the proportion, adding 1 time of water of the total weight of the mixture, stirring and reacting for 1.5 hours at the temperature of 50 ℃ and at the rotating speed of 200rpm to obtain a heavy metal capture material intermediate product; and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to enable the pH of the solution to be 12-13, so as to obtain the heavy metal capture material. At a rate of 0.4kg/m3Adding the added amount of the power of a certain companyIn the plating wastewater (total copper 33.8mg/L, chromium 3 valence 58.3mg/L, total nickel 19.8mg/L, total zinc 21.5mg/L), the mixture is stirred uniformly and then is kept stand, the supernatant is taken for data monitoring, and the detection results are shown in the following table.
Example 5:
the heavy metal capturing material prepared by the invention comprises, by mass, 9% of a porous adsorbing material, 8% of mercaptan, 2% of an inorganic sulfide, 8% of caustic alkali, 4% of sodium diethyldithiocarbamate, 6% of ammonium dithiocarbamate and the balance of water.
The porous adsorption material is formed by mixing ultrafine fly ash, attapulgite and sepiolite powder, and the components are equal in mass.
The caustic is sodium hydroxide.
The preparation method of the heavy metal capture material comprises the following steps: putting the porous adsorption material and caustic alkali into a stirrer according to the proportion, adding water 2 times of the total weight of the mixture, and stirring and reacting for 3 hours at the temperature of 60 ℃ at the rotating speed of 200rpm to obtain a modified porous adsorption material; putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to the proportion, adding 1 time of water of the total weight of the mixture, stirring and reacting for 1.5 hours at the temperature of 50 ℃ and at the rotating speed of 200rpm to obtain a heavy metal capture material intermediate product; and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to enable the pH of the solution to be 12-13, so as to obtain the heavy metal capture material. At a rate of 0.5kg/m3The addition amount of (2) is added into electroplating wastewater of a certain company (total copper is 33.8mg/L, chromium with 3 valence is 58.3mg/L, total nickel is 19.8mg/L, and total zinc is 21.5mg/L), the mixture is stirred uniformly and then stands, and the supernatant is taken for data monitoring, and the detection results are shown in the following table.
| Item | Total copper (mg/L) | Chromium 3 (mg/L) | Total nickel (mg/L) | Total zinc (mg/L) |
| Electroplating wastewater of a company | 33.8 | 58.3 | 19.8 | 21.5 |
| Example 1 | 0.091 | 0.578 | 0.124 | 0.648 |
| Example 2 | 0.101 | 0.784 | 0.217 | 1.081 |
| Example 3 | 0.112 | 0.918 | 0.405 | 1.124 |
| Example 4 | 0.143 | 0.861 | 0.315 | 1.415 |
| Example 5 | 0.121 | 0.864 | 0.208 | 0.984 |
From the results in the above table, it can be seen that the heavy metal capturing materials prepared in examples 1, 2,3, 4 and 5 can effectively remove the concentration of heavy metal ions in wastewater, and the index of the concentration of heavy metal is far lower than the discharge standard of electroplating pollutants (GB 21900-.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The heavy metal capturing material is characterized by comprising the following raw materials in percentage by mass:
9-12% of a porous adsorption material, 8-11% of mercaptan, 1-4% of an inorganic sulfide, 5-9% of caustic alkali, 3-7% of sodium diethyldithiocarbamate, 4-7% of ammonium dithiocarbamate and the balance of water.
2. The heavy metal capturing material according to claim 1, characterized in that the raw materials thereof comprise, by mass:
10% of porous adsorption material, 10% of mercaptan, 2% of inorganic sulfide, 8% of caustic alkali, 5% of sodium diethyldithiocarbamate, 5% of ammonium dithiocarbamate and the balance of water.
3. The heavy metal capturing material according to claim 1, characterized in that:
the porous adsorption material comprises at least three of ultrafine fly ash, diatomite, zeolite powder, corncob powder, attapulgite and sepiolite powder which are mixed, and the components are equal in mass.
4. The heavy metal capturing material according to claim 1, characterized in that:
the mercaptan comprises 1-propyl mercaptan and 2, 3-dimercaptopropanol which are mixed and formed, and the components are equal in mass.
5. The heavy metal capturing material according to claim 1, characterized in that:
the inorganic sulfide is formed by mixing sodium sulfide and sodium thiosulfate, and the components are equal in mass.
6. The heavy metal capturing material according to claim 1, characterized in that:
the caustic alkali is one or two of sodium hydroxide and potassium hydroxide.
7. The heavy metal capturing material according to claim 1, characterized in that the heavy metal capturing material is obtained by a method comprising the steps of:
step 1: putting the porous adsorption material and caustic alkali into a stirrer according to a ratio, adding water 1-2 times of the total weight of the mixture, and stirring and reacting at 45-60 ℃ at a rotating speed of 180-240 rpm for 2-3 hours to obtain a modified porous adsorption material;
step 2: putting mercaptan, inorganic sulfide, sodium diethyldithiocarbamate and ammonium dithiocarbamate into a stirrer according to a ratio, adding water which is 0.8-1 time of the total weight of the mixture, and stirring and reacting at the temperature of 40-50 ℃ at the rotating speed of 180-240 rpm for 1-1.5 hours to obtain a heavy metal capture material intermediate product;
and step 3: and (3) uniformly mixing the modified porous adsorption material and the intermediate product of the heavy metal capture material, and adding caustic alkali to adjust the pH value of the system to be 12-13, so as to obtain the heavy metal capture material.
8. Use of a heavy metal capture material according to any one of claims 1 to 7, wherein:
the heavy metal catching material is added according to the proportion of 0.1-0.5kg/m3The heavy metal ions in the industrial wastewater are removed by flocculation precipitation and solid-liquid separation.
9. Use according to claim 8, characterized in that:
the heavy metal ions comprise Cu2+、Ni+、Pb2+、Hg2+、Zn2+And Co2+。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114394637A (en) * | 2022-03-01 | 2022-04-26 | 山东第一医科大学(山东省医学科学院) | Heavy metal ion wastewater treatment agent and heavy metal ion wastewater treatment method |
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| CN106430484A (en) * | 2016-10-13 | 2017-02-22 | 无锡普立顺环保科技有限公司 | Efficient heavy metal trapping agent |
| CN110835130A (en) * | 2019-12-03 | 2020-02-25 | 云南科力新材料股份有限公司 | Heavy metal ion trapping agent and preparation method thereof |
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| JPH10156315A (en) * | 1996-10-04 | 1998-06-16 | Nippon Kayaku Co Ltd | Treating agent for heavy metal-containing waste and stabilizing treatment of heavy metal-containing waste |
| JP2005000763A (en) * | 2003-06-10 | 2005-01-06 | Ebara Engineering Service Co Ltd | Odor emission prevention method |
| CN102120659A (en) * | 2011-01-31 | 2011-07-13 | 无锡市霄鹰环境科技有限公司 | Method for removing nickel in chemical nickel-plating wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114394637A (en) * | 2022-03-01 | 2022-04-26 | 山东第一医科大学(山东省医学科学院) | Heavy metal ion wastewater treatment agent and heavy metal ion wastewater treatment method |
| CN114394637B (en) * | 2022-03-01 | 2023-09-22 | 山东第一医科大学(山东省医学科学院) | Heavy metal ion wastewater treatment agent and heavy metal ion wastewater treatment method |
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