CN115521008A - High-concentration wastewater treatment method - Google Patents
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- CN115521008A CN115521008A CN202211045769.6A CN202211045769A CN115521008A CN 115521008 A CN115521008 A CN 115521008A CN 202211045769 A CN202211045769 A CN 202211045769A CN 115521008 A CN115521008 A CN 115521008A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000002351 wastewater Substances 0.000 claims abstract description 35
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 34
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 27
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 21
- 238000004821 distillation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000012028 Fenton's reagent Substances 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 150000002978 peroxides Chemical class 0.000 claims abstract description 12
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 244000005700 microbiome Species 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 14
- 239000011790 ferrous sulphate Substances 0.000 claims description 14
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- 229940095991 ferrous disulfide Drugs 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 239000000243 solution Substances 0.000 description 38
- 230000000052 comparative effect Effects 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 4
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000010757 Reduction Activity Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
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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
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- 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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a high-concentration wastewater treatment method, which comprises the following steps: step 1, distilling high-concentration wastewater through a distillation tower, and removing a distillation product to obtain a treatment solution; step 2, performing Fenton oxidation on the treatment solution, wherein a Fenton reagent comprises ferrous salt and peroxide; and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 2-5g/L, the iron carbon is formed by sintering iron filings and carbon particles, and the mass ratio of the iron filings to the carbon particles is (4-6): 1; step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 15-31 ℃, and adjusting the pH value to 6.5-7.5; and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration. The invention can solve the problems that the existing wastewater treatment method in the prior art is complex in treatment process and low in COD removal efficiency.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a high-concentration wastewater treatment method.
Background
In the production process of chemical enterprises, more types of wastewater can be generated at the present stage. For example, when textile printing and dyeing auxiliaries, daily chemical auxiliaries and papermaking and oilfield chemicals are produced, wastewater with a high COD value is usually generated, the COD value in the wastewater is generally up to 20000-100000mg/L and can not be directly discharged, so that the COD removal treatment of high-concentration wastewater is required. At present, the treatment method for high-concentration wastewater comprises various methods such as physical sedimentation adsorption, chemical treatment, biological treatment and the like, however, the method at the present stage is generally complex in treatment process and low in COD removal efficiency, and a great COD value still exists after the treatment, so that the environmental hazard is generated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-concentration wastewater treatment method, which solves the problems that the existing wastewater treatment method in the prior art is complex in treatment process and low in COD removal efficiency.
The technical purpose of the invention is realized by the following technical scheme:
a high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing Fenton oxidation on the treatment liquid, adjusting the pH value of the treatment liquid to 1.5-5.5, and adding a Fenton reagent, wherein the Fenton reagent comprises ferrous salt and peroxide; wherein the content of ferrous salt in the treatment solution is 4-6 g/L, and the content of peroxide in the treatment solution is 30-50ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 2-5g/L, the iron carbon is formed by sintering iron filings and carbon particles, and the mass ratio of the iron filings to the carbon particles is (4-6): 1.
step 4, performing biochemical treatment on the product obtained in the step 3 by using aerobic microorganisms, adjusting the temperature to 15-31 ℃, and adjusting the pH value to 6.5-7.5;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
The invention is further configured to: the ferrous salt in the step 2 comprises one or more of ferrous sulfate, ferrous oxide and ferrous disulfide.
The invention is further configured to: the peroxide in step 2 is H 2 O 2 And is added in a manner of batch addition.
The invention is further configured to: the pH of the treatment solution in step 2 was adjusted to 2.5.
The invention is further configured to: in the step 3, the mass ratio of the iron filings to the carbon granules is 5:1.
the invention is further configured to: in step 4, the temperature is adjusted to 25 ℃ and the pH value is adjusted to 7.
The invention is further configured to: in the step 3, the content of iron and carbon in the treatment solution is 5g/L.
The invention has the advantages that:
1. in Fe 2+ Catalysis of ions with H 2 O 2 Has low decomposition activation energy and can be decomposed to generate hydroxyl radicals. The hydroxyl radical has high oxidation electrode potential, so that the hydroxyl radical has strong oxidation performance, can be used for oxidizing organic matters in the wastewater, and can play a role in treating the wastewater.
2. When the iron carbon contacts with the electrolyte solution, a primary battery taking the iron carbon as two poles is formed. Wherein the carbon electrode is the cathode and the iron electrode is the anode. Due to Fe 2+ The continuous generation of the Fe can lead a large amount of Fe to enter the solution, has chemical reduction activity, and has redox reaction with organic matters in the solution to play a role in treating the wastewater.
3. The iron-carbon structure has micropores and can play a role in precipitation, adsorption and purification.
4. The invention treats the high-concentration wastewater through a plurality of steps, partial organic matters can be volatilized in the distillation stage, so that the COD value is greatly reduced, 20-30% of COD can be removed in the Fenton oxidation and iron-carbon treatment processes, then the biochemical treatment and the precipitation processes are carried out, the COD removal efficiency can be greatly improved in the whole process, and the steps are simple.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing Fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to be 2, and adding a Fenton reagent, wherein the Fenton reagent comprises ferrous salt and peroxideIn this example, ferrous sulfate and H are selected 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 2g/L, the iron carbon is formed by sintering scrap iron and carbon particles, and the mass ratio of the scrap iron to the carbon particles is 5:1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
Example 2
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 2, and adding a fenton reagent, where the fenton reagent includes ferrous salt and peroxide, and ferrous sulfate and H are selected for the embodiment 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 3g/L, the iron carbon is formed by sintering scrap iron and carbon particles, and the mass ratio of the scrap iron to the carbon particles is 5:1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
Example 3
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 2, and adding a fenton reagent, where the fenton reagent includes ferrous salt and peroxide, and ferrous sulfate and H are selected for the embodiment 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 4g/L, the iron carbon is formed by sintering scrap iron and carbon particles, and the mass ratio of the scrap iron to the carbon particles is 5:1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
Example 4
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 2, and adding a fenton reagent, where the fenton reagent includes ferrous salt and peroxide, and ferrous sulfate and H are selected for the embodiment 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 5g/L, the iron carbon is formed by sintering scrap iron and carbon particles, and the mass ratio of the scrap iron to the carbon particles is 5:1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
Comparative example 1
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 2, and adding a fenton reagent, where the fenton reagent includes ferrous salt and peroxide, and ferrous sulfate and H are selected for the embodiment 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 5g/L, the iron carbon is formed by physically extruding iron filings and carbon particles, and the mass ratio of the iron filings to the carbon particles is 5:1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
Comparative example 2
A high-concentration wastewater treatment method comprises the following steps:
step 1, distilling high-concentration wastewater at 80 ℃ through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 2, and adding a fenton reagent, where the fenton reagent includes ferrous salt and peroxide, and ferrous sulfate and H are selected in this embodiment 2 O 2 (ii) a Wherein the content of ferrous sulfate in the treatment solution is 5g/L, H 2 O 2 The content in the treatment liquid is 40ml/L;
step 3, carrying out biochemical treatment on the product obtained in the step 2 by aerobic microorganisms, adjusting the temperature to 20 ℃, and adjusting the pH value to 7;
and 4, carrying out precipitation treatment on the product obtained in the step 3 to obtain the treated wastewater with low COD concentration.
Detection experiment:
COD values of the treated wastewater with low COD concentration obtained in examples 1-4 and comparative examples 1-2 were determined by acid potassium dichromate method, and the results shown in Table 1 below were obtained.
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| COD value | 1100 | 930 | 670 | 380 | 900 | 3200 |
Table 1 table for measuring COD value of wastewater of examples 1 to 4 and comparative examples 1 to 2
Examples 1-4 in the table above differ in the amount of iron carbon added in step 3, whereas in comparative example 2 no iron carbon was added. The COD values of examples 1-4 and comparative example 2 show that the addition of iron carbon in the wastewater treatment process can effectively improve the COD removal efficiency.
Example 4 in the above table is different from comparative example 2 in that in example 4, iron carbon is sintered from iron pieces and carbon particles; in comparative example 1, iron-carbon was physically extruded from iron filings and carbon particles. The COD value of the embodiment 4 and the comparative example 1 show that the iron carbon formed by sintering has higher efficiency of removing COD and adsorbing organic matters and better effect.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A high-concentration wastewater treatment method is characterized by comprising the following steps: the method comprises the following steps:
step 1, distilling high-concentration wastewater through a distillation tower, and removing a distillation product to obtain a treatment solution;
step 2, performing Fenton oxidation on the treatment solution, adjusting the pH value of the treatment solution to 1.5-5.5, and adding a Fenton reagent, wherein the Fenton reagent comprises ferrous salt and peroxide; wherein the content of ferrous salt in the treatment solution is 4-6 g/L, and the content of peroxide in the treatment solution is 30-50ml/L;
and 3, continuously adding iron carbon into the product obtained in the step 2, wherein the content of the iron carbon in the treatment solution is 2-5g/L, the iron carbon is formed by sintering iron filings and carbon particles, and the mass ratio of the iron filings to the carbon particles is (4-6): 1.
step 4, carrying out biochemical treatment on the product obtained in the step 3 by aerobic microorganisms, adjusting the temperature to 15-31 ℃, and adjusting the pH value to 6.5-7.5;
and 5, carrying out precipitation treatment on the product obtained in the step 4 to obtain the treated wastewater with low COD concentration.
2. The method for treating high-concentration wastewater according to claim 1, wherein: the ferrous salt in the step 2 comprises one or more of ferrous sulfate, ferrous oxide and ferrous disulfide.
3. The method for treating high-concentration wastewater according to claim 1, wherein: the peroxide in step 2 is H 2 O 2 And is added in a mode of batch addition.
4. The method for treating high concentration wastewater according to claim 1, wherein: the pH of the treatment solution in step 2 was adjusted to 2.5.
5. The method for treating high-concentration wastewater according to claim 1, wherein: in the step 3, the mass ratio of the iron filings to the carbon granules is 5:1.
6. the method for treating high-concentration wastewater according to claim 1, wherein: in step 4, the temperature is adjusted to 25 ℃ and the pH value is adjusted to 7.
7. The method for treating high-concentration wastewater according to claim 1, wherein: in the step 3, the content of iron and carbon in the treatment solution is 5g/L.
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