CN112573705A - Heavy metal chelating agent for treating acidic wastewater and preparation method and application thereof - Google Patents
Heavy metal chelating agent for treating acidic wastewater and preparation method and application thereof Download PDFInfo
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- CN112573705A CN112573705A CN202011434777.0A CN202011434777A CN112573705A CN 112573705 A CN112573705 A CN 112573705A CN 202011434777 A CN202011434777 A CN 202011434777A CN 112573705 A CN112573705 A CN 112573705A
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- heavy metal
- chelating agent
- metal chelating
- thioglycolate
- acidic wastewater
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 99
- 239000002738 chelating agent Substances 0.000 title claims abstract description 69
- 239000002351 wastewater Substances 0.000 title claims abstract description 69
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 150000002500 ions Chemical class 0.000 claims abstract description 23
- 239000012279 sodium borohydride Substances 0.000 claims abstract description 22
- 229910000033 sodium borohydride Inorganic materials 0.000 claims abstract description 22
- CWERGRDVMFNCDR-UHFFFAOYSA-M thioglycolate(1-) Chemical compound [O-]C(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-M 0.000 claims abstract description 20
- 229940071127 thioglycolate Drugs 0.000 claims abstract description 16
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 30
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 15
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 15
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 13
- 229910052770 Uranium Inorganic materials 0.000 claims description 12
- GNBVPFITFYNRCN-UHFFFAOYSA-M sodium thioglycolate Chemical compound [Na+].[O-]C(=O)CS GNBVPFITFYNRCN-UHFFFAOYSA-M 0.000 claims description 12
- 229940046307 sodium thioglycolate Drugs 0.000 claims description 12
- HYTYHTSMCRDHIM-UHFFFAOYSA-M potassium;2-sulfanylacetate Chemical compound [K+].[O-]C(=O)CS HYTYHTSMCRDHIM-UHFFFAOYSA-M 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 229910001430 chromium ion Inorganic materials 0.000 claims description 4
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 4
- 235000019800 disodium phosphate Nutrition 0.000 claims description 4
- 239000003002 pH adjusting agent Substances 0.000 claims description 4
- 239000001488 sodium phosphate Substances 0.000 claims description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 3
- 229910001431 copper ion Inorganic materials 0.000 claims description 3
- -1 uranium ions Chemical class 0.000 claims description 3
- 239000003352 sequestering agent Substances 0.000 claims 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 230000000052 comparative effect Effects 0.000 description 14
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical group [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000009388 chemical precipitation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000536 complexating effect Effects 0.000 description 3
- 239000002803 fossil fuel Substances 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- QEPWDOVCFOXLLE-UHFFFAOYSA-M NCC(=S)[S-].[Na+] Chemical compound NCC(=S)[S-].[Na+] QEPWDOVCFOXLLE-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 231100000739 chronic poisoning Toxicity 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- 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
-
- 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
- C02F2101/006—Radioactive compounds
-
- 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
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a heavy metal chelating agent for treating acidic wastewater, and a preparation method and application thereof, wherein the heavy metal chelating agent comprises the following components in parts by weight: thioglycolate, 60-80%; 5-30% of sodium borohydride; 5-15% of alkaline pH regulator. The heavy metal chelating agent for treating the acidic wastewater provided by the invention has a good treatment effect on heavy metal ions in the acidic wastewater, especially on the acidic wastewater with low concentration of the heavy metal ions, through reasonable selection of the components and the content of each component of the heavy metal chelating agent.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a heavy metal chelating agent for treating acidic wastewater and a preparation method and application thereof.
Background
In recent years, fossil fuels such as petroleum and coal are gradually replaced by clean energy sources, such as wind power, solar energy, nuclear power and the like, especially nuclear power, in order to reduce the emission of carbon dioxide to alleviate global warming, and the development of the fossil fuels is rapid, and the fossil fuels become one of the most concerned clean energy sources.
The most critical fuel in nuclear power is uranium, and a certain amount of acidic wastewater containing heavy metals such as uranium is inevitably generated by uranium in the processes of mining, refining, running of a nuclear power station and the like, and the acidic wastewater has high toxicity and certain radioactivity and can cause serious harm to human health and ecological environment, so that the acidic wastewater can be discharged into the environment after being properly treated.
At present, the treatment method of the acidic wastewater containing heavy metals such as uranium mainly comprises a chemical precipitation method, an adsorption method, an ion exchange method, a biotechnology, a membrane technology and the like, wherein the chemical precipitation method for treating the acidic wastewater has the characteristics of simple process, wide removal range, economy, practicability and the like.
However, in the process of treating wastewater by the chemical precipitation method, as the concentration of heavy metal ions is gradually reduced, the treatment effect is also rapidly reduced, so that the treatment effect on wastewater cannot achieve the ideal effect, especially on wastewater with low concentration of heavy metal ions.
Disclosure of Invention
The invention aims to provide a heavy metal chelating agent for treating acidic wastewater, and a preparation method and application thereof, so as to solve the problem that the chemical precipitation method in the prior art has poor wastewater treatment effect, especially the acidic wastewater with low heavy metal ion concentration.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the invention provides a heavy metal chelating agent for treating acidic wastewater, which comprises the following components by weight:
thioglycolate, 60-80%;
5-30% of sodium borohydride;
5-15% of alkaline pH regulator.
In some embodiments of the invention, the heavy metal chelating agent comprises, by weight of the heavy metal chelating agent:
thioglycolate, 65-75%;
15-25% of sodium borohydride;
5-10% of alkaline pH regulator.
In some embodiments of the invention, the thioglycolate salt is selected from at least one of sodium thioglycolate and potassium thioglycolate.
In some embodiments of the invention, the alkaline pH adjusting agent is selected from at least one of sodium hydroxide and potassium hydroxide.
In some embodiments of the invention, disodium hydrogen phosphate and/or sodium bicarbonate is also included, 5-25%.
In some embodiments of the invention, the disodium phosphate and/or sodium bicarbonate is 5-15% by weight.
In some embodiments of the invention, the disodium phosphate and/or sodium bicarbonate is sodium bicarbonate.
In a second aspect, the present invention further provides a preparation method of the above heavy metal chelating agent, including the following steps:
mixing thioglycolate, sodium borohydride and an alkaline pH regulator in proportion to obtain the heavy metal chelating agent.
In a third aspect, the present invention also provides a method for treating acidic wastewater, comprising the following steps:
mixing the heavy metal chelating agent with the acidic wastewater, and standing for 24-48h to obtain the treated wastewater.
In some embodiments of the invention, the wastewater comprises hexavalent uranium ions, copper ions, chromium ions and lead ions.
The embodiment provided by the invention has at least the following beneficial effects:
1) the heavy metal chelating agent for treating the acidic wastewater provided by the invention has a good treatment effect on heavy metal ions in the acidic wastewater, especially on the acidic wastewater with low concentration of the heavy metal ions, through reasonable selection of the components and the content of each component of the heavy metal chelating agent.
2) The preparation method of the heavy metal chelating agent provided by the invention is simple to operate, and can be used for quickly preparing the required heavy metal chelating agent.
3) The method for treating the acidic wastewater provided by the invention has a good treatment effect on heavy metal ions in the wastewater, and particularly has a good treatment effect on the acidic wastewater with low concentration of the heavy metal ions.
In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems, technical features included in the technical solutions, and advantageous effects brought by the technical features that can be solved by the heavy metal chelating agent for treating acidic wastewater, the preparation method and the application thereof provided by the present invention will be described in further detail in specific embodiments.
Detailed Description
The technical solutions in the examples of the present disclosure will be clearly and completely described below in connection with the specific embodiments of the present disclosure, and it is obvious that the described embodiments and/or examples are only a part of the embodiments and/or examples of the present disclosure, and not all embodiments and/or examples. All other embodiments and/or all other examples that can be obtained by one of ordinary skill in the art without making any inventive step based on the embodiments and/or examples in the present disclosure are within the scope of the present disclosure.
In the description of the present specification, the term "comprising", "including" or "containing" means that it may have, in addition to the components, other components which impart different properties to the heavy metal stabilizing chelating agent. In addition, the terms "comprising," including, "or" containing "as used in this disclosure may also include" consisting essentially of, and may instead be "or" consisting of.
In the description of the present specification, the term "and/or" refers to one and two or more of the options. For example, A, B and/or C refers to A, B, C, and a combination of two or three of A, B and C.
In the description of the present specification, amounts, ratios, and the like are by weight unless otherwise specified.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention provides a heavy metal chelating agent for treating acidic wastewater, which comprises the following components in parts by weight:
thioglycolate, 60-80%;
5-30% of sodium borohydride;
5-15% of alkaline pH regulator.
The heavy metal disclosed in the invention refers to a density of more than 4.5g/cm3Such as lead, chromium, copper, iron, mercury, radioactive elements, etc. Especially, heavy metals with significant biological toxicity are generally difficult to biodegrade, and can be further enriched in a large amount in a food chain and enter a human body through the food chain. The heavy metals can lead the strong interaction structure of proteins, enzymes and the like to carry out irreversible change in the human body, thereby leading the proteins, the enzymes and the like to lose activity and further influencing the health of the human body. Even these heavy metals may accumulate in certain tissues and organs of the human body, causing chronic poisoning. In some embodiments of the invention, the heavy metal comprises uranium, copper, chromium, lead, and the like.
As described above, thioglycolate, which is a main component of the heavy metal chelating agent, has a strong action force on heavy metals, and can form a water-insoluble complex with the heavy metals, and the complex can be removed from wastewater, thereby realizing the removal of the heavy metals in the wastewater. In addition, the weight proportion of the thioglycolate in the heavy metal chelating agent is 60-80%, preferably 65-75%, so that the good removal effect on heavy metal ions in the wastewater can be ensured.
In some embodiments of the present invention, the weight of thioglycolate salt may be, but is not limited to, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80% by weight of the heavy metal chelator.
Further, in some embodiments of the present invention, the thioglycolate salt may be selected from sodium thioglycolate and potassium thioglycolate, which may be used alone or in combination.
In addition, in the heavy metal chelating agent provided by the invention, sodium borohydride can be used as a reducing agent to stabilize variable-valence heavy metal ions, such as uranium, copper, chromium, lead and the like, so that the complexing effect can be ensured. In addition, other heavy metal impurities are not introduced in the process of treating the acidic wastewater. In addition, the weight of sodium borohydride is controlled within the range of 5-30%, preferably 15-25%, based on the weight of thioglycolate contained in the heavy metal chelator.
In some embodiments of the present invention, the weight of sodium borohydride may be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% by weight of the heavy metal chelator.
Under the acidic condition, the complexing effect of heavy metal ions in the wastewater and thioglycolate is poor, in particular to hexavalent uranium. Therefore, the pH regulator can adjust the pH value in the wastewater, and is favorable for the complexation of heavy metal ions in the acidic wastewater and thioglycolate. In order to be better beneficial to the complexation between the heavy metal ions in the acidic wastewater and the thioglycolate, the weight of the pH regulator needs to be controlled to be 5-15%, and preferably 5-10%.
In some embodiments of the invention, the weight of the pH adjusting agent may be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%.
Further, in some embodiments of the present invention, the pH adjusting agent may be selected from sodium hydroxide and potassium hydroxide, which may be used alone or in combination.
During the reaction process of the heavy metal chelating agent and the heavy metal in the acidic wastewater, the pH value in the wastewater may be changed, and the change may affect the complexing effect of the thioglycolate and the heavy metal ions in the acidic wastewater, so that the heavy metal chelating agent provided by the invention may further contain disodium hydrogen phosphate and/or sodium bicarbonate. In order to enable the disodium hydrogen phosphate and/or sodium bicarbonate to function better, the weight of the disodium hydrogen phosphate and/or sodium bicarbonate is controlled to be 5-25%, preferably 5-15%.
In some embodiments of the invention, the weight of disodium hydrogen phosphate and/or sodium bicarbonate can be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%.
In some embodiments of the invention, sodium bicarbonate may be selected.
In conclusion, the heavy metal chelating agent for treating the acidic wastewater provided by the invention has a good treatment effect on heavy metal ions in the acidic wastewater through reasonable selection of the components and the content of each component of the heavy metal chelating agent, and especially on the acidic wastewater with low concentration of the heavy metal ions.
The invention also provides a preparation method of the heavy metal chelating agent, which comprises the following steps:
mixing thioglycolate, sodium borohydride and an alkaline pH regulator in proportion to obtain the heavy metal chelating agent.
In some embodiments of the invention, disodium phosphate and/or sodium bicarbonate may also be added thereto for mixing.
The preparation method of the heavy metal chelating agent provided by the invention is simple to operate, and can be used for quickly preparing the required heavy metal chelating agent.
The invention also provides a treatment method of the acidic wastewater, which comprises the following steps:
mixing the heavy metal chelating agent with the acidic wastewater, and standing for 24-48h to obtain the treated wastewater.
In some embodiments of the invention, the acidic wastewater comprises hexavalent uranium ions, copper ions, chromium ions and lead ions. Wherein the chromium ions may be trivalent or hexavalent.
The method for treating the acidic wastewater provided by the invention has a good treatment effect on heavy metal ions in the wastewater, and particularly has a good treatment effect on the acidic wastewater with low concentration of the heavy metal ions.
The heavy metal chelating agent, the preparation method and the application thereof according to the present invention will be described in detail with reference to the following embodiments.
Unless otherwise specified, the chemical materials and instruments used in the following examples and comparative examples are all conventional chemical materials and conventional instruments, and are commercially available.
Example 1
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
60g of sodium thioglycolate, 25g of sodium borohydride and 15g of sodium hydroxide are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 2
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
65g of sodium thioglycolate, 25g of sodium borohydride and 10g of sodium hydroxide are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 3
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
80g of potassium thioglycolate, 15g of sodium borohydride and 5g of potassium hydroxide are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 4
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
after 45g of sodium thioglycolate, 30g of potassium thioglycolate, 20g of sodium borohydride and 5g of sodium hydroxide were uniformly mixed, the heavy metal chelating agent of the present embodiment was obtained.
Example 5
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
65g of sodium thioglycolate, 30g of sodium borohydride and 5g of potassium hydroxide are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 6
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
70g of sodium thioglycolate, 25g of sodium borohydride, 5g of potassium hydroxide and 5g of sodium bicarbonate are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 7
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
60g of sodium thioglycolate, 5g of sodium borohydride, 10g of potassium hydroxide, 15g of sodium bicarbonate and 10g of disodium hydrogen phosphate are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Example 8
The embodiment provides a preparation method of a heavy metal chelating agent for treating acidic wastewater, which comprises the following steps:
65g of sodium thioglycolate, 10g of sodium borohydride, 10g of potassium hydroxide and 10g of disodium hydrogen phosphate are uniformly mixed to obtain the heavy metal chelating agent of the embodiment.
Comparative example 1
The present comparative example provides a method of preparing a chelating agent, comprising the steps of:
60g of sodium thioglycolate and 15g of sodium hydroxide were mixed uniformly to obtain the chelating agent of this comparative example.
Comparative example 2
The present comparative example provides a method of preparing a chelating agent, comprising the steps of:
60g of sodium thioglycolate and 25g of sodium borohydride were mixed uniformly to obtain the chelating agent of the present comparative example.
Comparative example 3
After 60g of sodium dithioglycinate, 25g of sodium borohydride and 15g of sodium hydroxide were mixed uniformly, the chelating agent of this comparative example was obtained.
Acid wastewater: the pH was 3 to 6, and the heavy metal content thereof is shown in Table 1.
TABLE 1
| Uranium (mg/L) | Copper (mg/L) | Chromium (mg/L) | Lead (mg/L) |
| 130 | 45 | 12 | 8 |
The chelating agents prepared in examples 1 to 8 and comparative examples 1 to 3 were used to treat acidic wastewater. In this experiment, 15L of wastewater was added with 10g of the chelating agent, stirred uniformly, and then left to stand for 24 hours, and then the supernatant was taken out for detection, and the obtained detection results are shown in Table 2.
TABLE 2
| Uranium (mg/L) | Copper (mg/L) | Chromium (mg/L) | Lead (mg/L) | |
| Acid waste water | 130 | 45 | 12 | 8 |
| Example 1 | 0.04 | 1.5 | 1.2 | 0.9 |
| Example 2 | 0.02 | 1.1 | 0.9 | 0.5 |
| Example 3 | 0.035 | 1.4 | 1.1 | 0.85 |
| Example 4 | 0.015 | 0.9 | 0.88 | 0.45 |
| Example 5 | 0.045 | 1.6 | 1.35 | 0.86 |
| Example 6 | 0.025 | 0.95 | 0.94 | 0.52 |
| Example 7 | 0.042 | 1.4 | 1.3 | 0.87 |
| Example 8 | 0.045 | 1.5 | 1.35 | 0.95 |
| Comparative example 1 | 22 | 12 | 5 | 3 |
| Comparative example 2 | 32 | 15 | 6 | 5 |
| Comparative example 3 | 8 | 2 | 1.8 | 1.2 |
| Emission standard | 0.05 | 2 | 1.5 | 1 |
As can be seen from Table 2, the heavy metal chelating agents of the present invention have a good treatment effect on heavy metal ions in acidic wastewater by comparing the examples 1 to 8 with the comparative examples 1 to 3.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A heavy metal chelating agent for treating acidic wastewater, which is characterized by comprising the following components in percentage by weight:
thioglycolate, 60-80%;
5-30% of sodium borohydride;
5-15% of alkaline pH regulator.
2. The heavy metal chelator of claim 1, wherein the heavy metal chelator comprises, by weight of the heavy metal chelator:
thioglycolate, 65-75%;
15-25% of sodium borohydride;
5-10% of alkaline pH regulator.
3. The heavy metal chelator of claim 1 or 2, wherein the thioglycolate salt is selected from at least one of sodium thioglycolate and potassium thioglycolate.
4. The heavy metal sequestrant of claim 1 or 2, wherein the alkaline pH modifier is selected from at least one of sodium hydroxide and potassium hydroxide.
5. The heavy metal sequestrant of claim 1 or 2, further comprising disodium hydrogen phosphate and/or sodium bicarbonate, 5-25%.
6. The heavy metal sequestrant of claim 5, wherein the disodium phosphate and/or sodium bicarbonate is present in an amount of 5-15% by weight.
7. The heavy metal sequestrant of claim 6, wherein the disodium hydrogen phosphate and/or sodium bicarbonate is sodium bicarbonate.
8. A method for preparing a heavy metal chelating agent according to claim 1, comprising the steps of:
mixing thioglycolate, sodium borohydride and an alkaline pH regulator in proportion to obtain the heavy metal chelating agent.
9. A method for treating acidic wastewater, which is characterized by comprising the following steps:
mixing the heavy metal chelating agent with the acidic wastewater, and standing for 24-48h to obtain the treated wastewater.
10. The process of claim 9 wherein the wastewater contains hexavalent uranium ions, copper ions, chromium ions and lead ions.
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