CN114031228A - Method for breaking and stably releasing chromium in organic chromium-containing wastewater - Google Patents
Method for breaking and stably releasing chromium in organic chromium-containing wastewater Download PDFInfo
- Publication number
- CN114031228A CN114031228A CN202111340553.8A CN202111340553A CN114031228A CN 114031228 A CN114031228 A CN 114031228A CN 202111340553 A CN202111340553 A CN 202111340553A CN 114031228 A CN114031228 A CN 114031228A
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- chromium
- finished
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- adjusting
- containing wastewater
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 66
- 239000011651 chromium Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002351 wastewater Substances 0.000 title claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000001257 hydrogen Substances 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 230000035484 reaction time Effects 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004202 carbamide Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 239000002516 radical scavenger Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 230000000368 destabilizing effect Effects 0.000 claims 3
- 239000002910 solid waste Substances 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 description 4
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 241000501667 Etroplus Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 210000000750 endocrine system Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 210000001533 respiratory mucosa Anatomy 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- 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
- C02F2101/30—Organic compounds
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 discloses a method for stably releasing chromium from organic chromium-containing wastewater, relates to the field of sewage treatment, and aims to solve the technical problems of high treatment difficulty, more solid wastes and high cost of a treatment method of chromium-containing wastewater in the prior art, wherein the technical scheme of the invention is as follows: the method comprises the following steps: step one, adding a hydrogen bond damaging agent into organic chromium-containing wastewater at the temperature of 20-40 ℃, and mechanically stirring for reaction; step two, adding an alkaline agent for adjusting the pH value into the wastewater after the reaction is finished, adjusting the pH value to be between 8 and 10, and performing solid-liquid separation after the reaction is finished; and step three, after the step two is finished, taking the supernatant to carry out ultrasonic treatment, adding an alkaline agent for adjusting the pH value after the ultrasonic treatment is finished, adjusting the pH value to 8-10, and carrying out solid-liquid separation after the ultrasonic treatment is finished. And step four, after the step three is finished, taking supernatant liquid, stirring, adding a heavy metal capture agent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for stably releasing chromium from organic chromium-containing wastewater.
Background
The metal chromium has wide industrial application, and the compound of the metal chromium is widely present in waste water discharged by industries such as chromium salt production, textile dyeing, dye production, leather making, electroplating and the like. It exists primarily as trivalent and hexavalent adducts, which are more biologically toxic than trivalent chromium due to its high solubility. Chromide can invade the human body through respiratory tract and mucosa, and mainly accumulates in liver, kidney, endocrine system and lung.
For example, in the prior art, chromium ions are directly subjected to physical and chemical precipitation, but complex chromium in water is difficult to be directly precipitated, and more chromium-containing sludge is generated.
The ion exchange method is to adsorb chromium by porous resin or ion exchange fiber, most of the adsorbed chromium is in an ionic state, the effect on the chromium in a complex state is limited, and in the actual operation process, the problems of regeneration, recovery and the like of the adsorbent due to strong adsorption capacity are difficult, and the cost is high.
Disclosure of Invention
The invention provides a method for stably releasing chromium from organic chromium-containing wastewater, which is used for solving the technical problems of high treatment difficulty, more solid waste and high treatment cost in the treatment method of the organic chromium-containing wastewater in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for breaking and stably releasing chromium in organic chromium-containing wastewater comprises the following steps:
step one, adding a hydrogen bond damaging agent into organic chromium-containing wastewater at the temperature of 20-40 ℃, and mechanically stirring for reaction;
step two, adding an alkaline agent for adjusting the pH value into the wastewater after the reaction is finished, adjusting the pH value to be between 8 and 10, and performing solid-liquid separation after the reaction is finished;
step three, after the step two is finished, taking the supernatant to carry out ultrasonic treatment, adding an alkaline agent for adjusting the pH value after the ultrasonic treatment is finished, adjusting the pH value to 8-10, and carrying out solid-liquid separation after the ultrasonic treatment is finished;
and step four, after the step three is finished, taking supernatant liquid, stirring, adding a heavy metal capture agent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
Preferably, the chromium in the organic chromium-containing wastewater exists in a complex state, and the total chromium concentration is 0.001-50 mg/l.
Preferably, in step one, the hydrogen bond disrupting agent used is urea.
Preferably, in the second step and the third step, the alkaline agent used for adjusting the pH is one or more of sodium hydroxide, potassium carbonate and sodium carbonate.
Preferably, in the third step, the ultrasonic reaction power is 500-1000W.
Preferably, in the fourth step, the heavy metal scavenger is sodium ferometalate.
Preferably, the reaction time of the hydrogen bond disruptor in the first step is 15-60min at 20-40 ℃.
Preferably, the ultrasonic reaction time of the third step at the temperature of 20-40 ℃ is 15-60 min.
Preferably, the reaction time of the heavy metal capture agent in the fourth step is 30-60min at the temperature of 20-40 ℃.
The invention has the beneficial effects that: the process can completely convert the complex chromium in the organic chromium-containing wastewater into the ionic chromium, and has the advantages of low cost, small production amount of chromium-containing sludge and easy popularization.
The hydrogen bond disruptor (urea) can disrupt hydrogen bonds in the complex to change the conformation of the complex, further influence the aggregation and dissolution state of the complex, thereby influencing the binding and releasing process of chromium, achieving the purpose of disrupting the stability of the chromium, and further being capable of removing the chromium in the complex more easily.
The ultrasound can prevent the hydrogen bonding between the polymer and the protein, and the exposed chromium coated in the polymer is realized.
The heavy metal trapping agent (sodium ferometalate) can remove the chromium from the complex and change the chromium ion into a free state, so that the chromium can be more easily precipitated from the water.
Through the points, compared with the traditional chromium removal method, the method has the advantage of low solid waste yield because the coagulant is not involved.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for breaking and stably releasing chromium in organic chromium-containing wastewater comprises the following steps:
step one, adding a hydrogen bond damaging agent into organic chromium-containing wastewater at the temperature of 20-40 ℃, and mechanically stirring for reaction; wherein the chromium in the organic chromium-containing wastewater exists in a complex state, the total chromium concentration is 0.001-50mg/l, the hydrogen bond disruptor in the setting is urea, and in the step, the reaction time of the hydrogen bond disruptor is 15-60 min.
Step two, adding an alkaline agent for adjusting the pH value into the wastewater after the reaction is finished, adjusting the pH value to be between 8 and 10, and performing solid-liquid separation after the reaction is finished;
step three, after the step two is finished, taking the supernatant to carry out ultrasonic treatment, wherein the ultrasonic reaction power is 500-1000W, the ultrasonic reaction time is 15-60min, adding an alkaline agent for adjusting the pH value after the ultrasonic treatment is finished, adjusting the pH value to 8-10, and carrying out solid-liquid separation after the ultrasonic treatment is finished;
in the second step and the third step, the alkaline agent used for adjusting the pH is one or more of sodium hydroxide, potassium carbonate and sodium carbonate.
And step four, after the step three is finished, taking supernatant liquid, stirring, adding a heavy metal capture agent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization. The heavy metal trapping agent is sodium ferbamate, and the reaction time of the heavy metal trapping agent is 30-60 min.
Through the steps, the complex chromium in the organic chromium-containing wastewater can be completely converted into the ionic chromium, the cost is low, the generation amount of the chromium-containing sludge is small, and the method is easy to popularize.
The hydrogen bond disruptor (urea) can disrupt hydrogen bonds in the complex to change the conformation of the complex, further influence the aggregation and dissolution state of the complex, thereby influencing the binding and releasing process of chromium, achieving the purpose of disrupting the stability of the chromium, and further being capable of removing the chromium in the complex more easily.
The ultrasound can prevent the hydrogen bonding between the polymer and the protein, and the exposed chromium coated in the polymer is realized.
The heavy metal trapping agent (sodium ferometalate) can remove the chromium from the complex and change the chromium ion into a free state, so that the chromium can be more easily precipitated from the water.
Through the points, compared with the traditional chromium removal method, the method has the advantage of low solid waste yield because the coagulant is not involved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for breaking and stably releasing chromium in organic chromium-containing wastewater is characterized by comprising the following steps:
step one, adding a hydrogen bond damaging agent into organic chromium-containing wastewater at the temperature of 20-40 ℃, and mechanically stirring for reaction;
step two, adding an alkaline agent for adjusting the pH value into the wastewater after the reaction is finished, adjusting the pH value to be between 8 and 10, and performing solid-liquid separation after the reaction is finished;
step three, after the step two is finished, taking the supernatant to carry out ultrasonic treatment, adding an alkaline agent for adjusting the pH value after the ultrasonic treatment is finished, adjusting the pH value to 8-10, and carrying out solid-liquid separation after the ultrasonic treatment is finished;
and step four, after the step three is finished, taking supernatant liquid, stirring, adding a heavy metal capture agent, and after the reaction is finished, carrying out solid-liquid separation to finish dechromization.
2. The method as claimed in claim 1, wherein the chromium in the wastewater exists in a complex state, and the total chromium concentration is 0.001-50 mg/l.
3. The method as claimed in claim 1, wherein the hydrogen bond breaking agent used in the first step is urea.
4. The method as claimed in claim 1, wherein in the second and third steps, the alkaline agent used for adjusting pH is one or more of sodium hydroxide, potassium carbonate and sodium carbonate.
5. The method as claimed in claim 1, wherein the ultrasonic reaction power is 500-1000W in the third step.
6. The method of claim 1, wherein in step four, the heavy metal scavenger is sodium ferbamate.
7. The method for destabilizing and releasing chromium of organic chromium-containing wastewater according to any one of claims 1 or 3, wherein the reaction time of the hydrogen bond disruptor in the first step is 15-60min at 20-40 ℃.
8. The method for destabilizing and releasing chromium of organic chromium-containing wastewater according to any one of claims 1, 4 or 5, wherein the ultrasonic reaction time of the third step at the temperature of 20-40 ℃ is 15-60 min.
9. The method for destabilizing and releasing chromium of organic chromium-containing wastewater according to any one of claims 1 or 6, wherein the reaction time of the heavy metal scavenger in the fourth step is 30-60min at 20-40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111340553.8A CN114031228A (en) | 2021-11-12 | 2021-11-12 | Method for breaking and stably releasing chromium in organic chromium-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111340553.8A CN114031228A (en) | 2021-11-12 | 2021-11-12 | Method for breaking and stably releasing chromium in organic chromium-containing wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114031228A true CN114031228A (en) | 2022-02-11 |
Family
ID=80137438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111340553.8A Pending CN114031228A (en) | 2021-11-12 | 2021-11-12 | Method for breaking and stably releasing chromium in organic chromium-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114031228A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004017025A (en) * | 2002-06-20 | 2004-01-22 | Kurita Water Ind Ltd | Treatment method of chromium-containing wastewater |
| CN109867421A (en) * | 2019-04-08 | 2019-06-11 | 陕西科技大学 | A kind of chromium-bearing sludge processing method and system based on supercritical water oxidation |
| CN110642395A (en) * | 2019-10-12 | 2020-01-03 | 广州超邦化工有限公司 | Method for treating fluoride ion-containing sulfate trivalent chromium plating wastewater |
| CN111547956A (en) * | 2020-05-25 | 2020-08-18 | 西安优瑞卡环保科技有限公司 | Biochemical method for breaking chromium-containing organic wastewater |
-
2021
- 2021-11-12 CN CN202111340553.8A patent/CN114031228A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004017025A (en) * | 2002-06-20 | 2004-01-22 | Kurita Water Ind Ltd | Treatment method of chromium-containing wastewater |
| CN109867421A (en) * | 2019-04-08 | 2019-06-11 | 陕西科技大学 | A kind of chromium-bearing sludge processing method and system based on supercritical water oxidation |
| CN110642395A (en) * | 2019-10-12 | 2020-01-03 | 广州超邦化工有限公司 | Method for treating fluoride ion-containing sulfate trivalent chromium plating wastewater |
| CN111547956A (en) * | 2020-05-25 | 2020-08-18 | 西安优瑞卡环保科技有限公司 | Biochemical method for breaking chromium-containing organic wastewater |
Non-Patent Citations (1)
| Title |
|---|
| 李晓洁: "制革污泥超临界水氧化与超声协同脱铬效应研究" * |
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Application publication date: 20220211 |
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