CN114477524A - Method for removing COD (chemical oxygen demand) in flue gas wastewater of zinc leaching residue rotary kiln by ozone pretreatment - Google Patents
Method for removing COD (chemical oxygen demand) in flue gas wastewater of zinc leaching residue rotary kiln by ozone pretreatment Download PDFInfo
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000002351 wastewater Substances 0.000 title claims abstract description 79
- 239000011701 zinc Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 43
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 32
- 238000002386 leaching Methods 0.000 title claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000003546 flue gas Substances 0.000 title claims abstract description 28
- 239000000126 substance Substances 0.000 title claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title abstract description 7
- 239000001301 oxygen Substances 0.000 title abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 title abstract description 7
- 239000000706 filtrate Substances 0.000 claims abstract description 49
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 23
- 238000005188 flotation Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 15
- 239000011259 mixed solution Substances 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 230000035484 reaction time Effects 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 abstract description 22
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 15
- 239000010865 sewage Substances 0.000 abstract description 12
- 230000003647 oxidation Effects 0.000 abstract description 5
- 150000002500 ions Chemical class 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 28
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 24
- 239000007788 liquid Substances 0.000 description 24
- 239000000243 solution Substances 0.000 description 18
- 238000004458 analytical method Methods 0.000 description 14
- 238000004364 calculation method Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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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)
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- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a method for removing COD (chemical oxygen demand) in wastewater generated in the flue gas washing process of a zinc leaching residue rotary kiln by ozone pretreatment, which comprises the following steps: adding an alkaline substance into the wastewater, adjusting the pH value of the wastewater, and carrying out a neutralization reaction to obtain a mixed solution; filtering the mixed solution to obtain filter residue and filtrate; introducing ozone into the filtrate to carry out oxidation reaction to obtain ozone-oxidized wastewater; and after being dispersed by a flotation machine, the ozone is contacted with the filtrate to carry out oxidation reaction. The waste water is made alkaline by adding alkaline substances into the waste water, and the waste water is neutralized under alkaline conditions, so that part of heavy metal ions in the waste water are precipitated and removed after filtration, and then ozone is introduced into the filtrate for ozone oxidation, so that COD in the filtrate is removed, good conditions are created for subsequent sewage treatment procedures, and the treatment capacity of subsequent sewage is improved. Meanwhile, the treatment method has simple process and easy operation.
Description
Technical Field
The invention relates to the technical field of sewage, in particular to a method for removing COD (chemical oxygen demand) in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment.
Background
In the process that zinc smelting enterprises adopt the rotary kiln to treat zinc leaching residues, generated flue gas can generate a certain amount of wastewater containing heavy metal, ammonia nitrogen and COD after being washed by a prewashing tower, the components of the wastewater are complex, the COD treatment capacity of the subsequent sewage treatment process on the wastewater is limited, and if a large amount of zinc leaching residue rotary kiln flue gas wastewater is directly sent to the subsequent sewage treatment process for treatment, the normal production of the sewage treatment process is influenced.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment, which aims to reduce the concentration of COD in the wastewater and remove a certain amount of heavy metal and ammonia nitrogen simultaneously by pretreatment so as to create good conditions for the subsequent sewage treatment process.
The technical scheme of the invention is as follows:
a method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment comprises the following steps:
adding an alkaline substance into the wastewater, adjusting the pH value of the wastewater, and carrying out a neutralization reaction to obtain a mixed solution;
filtering the mixed solution to obtain filter residue and filtrate;
introducing ozone into the filtrate to carry out oxidation reaction to obtain ozone-oxidized wastewater; and after being dispersed by a flotation machine, the ozone is contacted with the filtrate to carry out oxidation reaction.
Optionally, the method for removing COD in the flue gas wastewater of the zinc leaching residue rotary kiln by ozone pretreatment is characterized in that the pH value of the wastewater is regulated and controlled to be more than 8;
optionally, the method for removing COD in the rotary kiln flue gas wastewater of zinc leaching residues by ozone pretreatment, wherein the neutralization reaction time is 30-60 min;
optionally, the method for removing COD in the rotary kiln flue gas wastewater of zinc leaching residues by ozone pretreatment is adopted, wherein the concentration of ozone is 90mg/L-100 mg/L.
Optionally, the method for removing COD in the rotary kiln flue gas wastewater of zinc leaching residues by ozone pretreatment, wherein the alkaline substance is lime water or sodium hydroxide.
Optionally, the method for removing COD in the rotary kiln flue gas wastewater of zinc leaching residues by ozone pretreatment is adopted, wherein the COD of the wastewater oxidized by ozone is less than or equal to 200 mg/L.
Optionally, the method for removing COD in the rotary kiln flue gas wastewater of zinc leaching residues by ozone pretreatment, wherein the reaction time of the oxidation reaction is 1-4 hours.
Optionally, the method for removing COD in zinc leaching residue rotary kiln flue gas wastewater by ozone pretreatment, wherein the step of introducing ozone into the filtrate to perform oxidation reaction to obtain ozone-oxidized wastewater specifically comprises:
and introducing ozone into the filtrate for oxidation reaction, and continuously adding the alkaline substance in the oxidation reaction process to ensure that the pH value of the filtrate is 9-10.
The method for removing COD in smoke wastewater of the zinc leaching slag rotary kiln through ozone pretreatment provided by the invention has the beneficial effects that alkaline substances are added into the wastewater to make the wastewater alkaline, a neutralization reaction is carried out under the alkaline condition, so that part of heavy metal ions in the wastewater are precipitated and removed after filtration, ozone is introduced into filtrate for ozone oxidation, the COD in the filtrate is removed, good conditions are created for the subsequent sewage treatment process, and the treatment capacity of the subsequent sewage is improved.
Drawings
FIG. 1 is a flow chart of the method for removing COD in flue gas wastewater of a rotary kiln containing zinc leaching residues by ozone pretreatment.
Detailed Description
The invention provides a method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment, and the invention is further explained in detail below in order to make the purpose, technical scheme and effect of the invention clearer and more clear. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the units indicating the content of the raw materials are all in parts by mass. Other raw materials and reagents not specifically mentioned in the present invention are those generally used in the art.
Noun interpretation
Chemical Oxygen demand (cod) (chemical l Oxygen demand) is a method for chemically measuring the amount of reducing substances to be oxidized in a water sample. The oxygen equivalent of a substance (typically an organic substance) that can be oxidized by a strong oxidizing agent in wastewater, wastewater treatment plant effluent, and contaminated water.
As shown in fig. 1, the method for removing COD in flue gas wastewater of a rotary kiln containing zinc leaching residues by ozone pretreatment provided by the invention comprises the following steps:
s10, adding an alkaline substance into the wastewater, adjusting the pH value of the wastewater, and carrying out a neutralization reaction to obtain a mixed solution.
Specifically, the waste water is generated after flue gas generated in the process of treating zinc leaching residues by adopting a rotary kiln is washed by a prewashing tower, the waste water contains a large amount of heavy metals such as zinc, copper, ammonia nitrogen and COD, and the content of the COD is generally above 1300 mg/L. The waste water is generally acidic, and in order to precipitate a part of heavy metal impurities in the waste water, the waste water can be made alkaline by adding an alkaline substance to the waste water. That is, a part of impurities in the wastewater may be precipitated under an alkaline environment. Wherein, the alkaline substance includes but is not limited to sodium hydroxide and limestone (lime water). Adding alkaline substance to adjust pH of the wastewater to be more than 8, such as pH of 10.
And step S20 is included after the step S10, and the mixed solution is filtered to obtain filter residue and filtrate.
Specifically, the mixed solution obtained after the alkaline substance is added in the step S10 for reaction is filtered by a mechanical filtration method, for example, a plate and frame filter is used for filtering to obtain a filter residue and a filtrate, wherein the filter residue contains a part of heavy metals and can be subsequently recycled. It is easy to understand that the filtration can be plate and frame filter filtration, and can also adopt suction filtration to filter, and the specific filtration mode can be selected according to the practical application.
Step S30 is further included after the step S20, ozone is introduced into the filtrate for oxidation reaction, and wastewater oxidized by ozone is obtained; and after being dispersed by a flotation machine, the ozone is contacted with the filtrate to carry out oxidation reaction.
Specifically, COD in the wastewater (after filtration) before ozone introduction is high, and the wastewater is not suitable for directly entering a post-stage for sewage treatment, the COD in the wastewater is oxidized by introducing ozone with a preset concentration, and the ozone is oxidized by utilizing the strong oxidizing property of the ozone to achieve the purpose of removal.
Illustratively, the concentration of ozone may be 90mg/L to 95mg/L, 95mg/L to 100 mg/L. The ozone oxidation time may be 1 hour to 2 hours, 2 hours to 3 hours, 3 hours to 4 hours.
In this embodiment, in order to make ozone react with the COD emergence in the waste water better, ozone can get into waste water through the flotation device, utilizes the flotation device with ozone homodisperse, ozone after the dispersion can with the abundant contact of waste water, and then can promote the utilization ratio of ozone, promote the effect of smoking oxidation.
The method for removing COD in flue gas wastewater of a rotary kiln containing zinc leaching residues by ozone pretreatment provided by the invention is further explained by specific examples.
Example 1
Taking 2L of the pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 26.02g/L Zn, 2506mg/L ammonia nitrogen and 1198mg/L COD, adding sodium hydroxide to adjust the pH value of the pre-washing liquid to 9, stirring for neutralization reaction for 30min, filtering by using a vacuum pump to obtain a filtrate, placing the filtrate under a flotation machine, enabling the concentration of ozone to be 90mg/L, and enabling the ozone to be fully contacted and reacted with the filtrate for 1h after being dispersed by the flotation machine.
After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 1.73g/L of Zn, 1067mg/L of ammonia nitrogen and 169mg/L of COD, and the COD removal rate is 85.9%, the heavy metal Zn removal rate is 93.4% and the ammonia nitrogen removal rate is 57.4% by calculation.
Example 2
Taking 2L of the pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 26.02g/L of Zn, 2506mg/L of ammonia nitrogen and 1198mg/L of COD, adding sodium hydroxide to adjust the pH value of the pre-washing liquid to 10, stirring for neutralization reaction for 35min, filtering by adopting a vacuum pump to obtain filtrate, placing the filtrate under a flotation machine, enabling the concentration of ozone to be 100mg/L, and fully contacting and reacting the ozone with the filtrate for 2h after the ozone is dispersed by the flotation machine. After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 1.51g/L of Zn, 1031mg/L of ammonia nitrogen and 125mg/L of COD, and the COD removal rate is 89.6%, the heavy metal Zn removal rate is 94.2% and the ammonia nitrogen removal rate is 58.9% by calculation.
Example 3
Taking 2L of a pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 26.02g/L Zn, 2506mg/L ammonia nitrogen and 1198mg/L COD, adding sodium hydroxide to adjust the pH value of the pre-washing liquid to 9.5, stirring for neutralization reaction for 45min, filtering by using a vacuum pump to obtain a filtrate, placing the filtrate under a flotation machine, wherein the ozone concentration is 95mg/L, and fully contacting and reacting the ozone with the filtrate for 2h after the ozone is dispersed by the flotation machine.
After the reaction, a liquid after the reaction is obtained, and the liquid after the reaction is subjected to component analysis, wherein the liquid contains 1.58g/L of Zn, 1051mg/L of ammonia nitrogen and 146mg/L of COD, and the COD removal rate is 87.8%, the heavy metal Zn removal rate is 93.9% and the ammonia nitrogen removal rate is 58.1% by calculation.
Example 4
Taking 5L of pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 66.82g/L Zn, 6268mg/L ammonia nitrogen and 2998mg/L COD, adding sodium hydroxide to adjust the pH value of the pre-washing liquid to 9, stirring for neutralization reaction for 30min, filtering by using a vacuum pump to obtain filtrate, placing the filtrate under a flotation machine, wherein the ozone concentration is 90mg/L, and after the ozone is dispersed by the flotation machine, fully contacting and reacting with the filtrate for 1 h.
After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 3.46g/L of Zn, 2134mg/L of ammonia nitrogen and 338mg/L of COD, and the COD removal rate is 88.7%, the heavy metal Zn removal rate is 94.8% and the ammonia nitrogen removal rate is 65.9% by calculation.
Example 5
Taking 5L of pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 66.82g/L Zn, 6268mg/L ammonia nitrogen and 2998mg/L COD, adding sodium hydroxide to adjust the pH of the pre-washing liquid to 9.5, stirring for neutralization reaction for 50min, filtering by using a vacuum pump to obtain filtrate, placing the filtrate under a flotation machine, wherein the ozone concentration is 95mg/L, and fully contacting and reacting the filtrate after the ozone is dispersed by the flotation machine for 3 h.
After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 3.21g/L of Zn, 2120mg/L of ammonia nitrogen and 315mg/L of COD, and the COD removal rate is 89.5%, the heavy metal Zn removal rate is 95.2% and the ammonia nitrogen removal rate is 66.2% by calculation.
Example 6
Taking 5L of pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 66.82g/L Zn, 6268mg/L ammonia nitrogen and 2998mg/L COD, adding sodium hydroxide to adjust the pH of the pre-washing liquid to 9.5, stirring for neutralization reaction for 50min, filtering by using a vacuum pump to obtain filtrate, placing the filtrate under a flotation machine, wherein the ozone concentration is 95mg/L, and fully contacting and reacting the filtrate after the ozone is dispersed by the flotation machine for 3 h.
After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 3.21g/L of Zn, 2120mg/L of ammonia nitrogen and 315mg/L of COD, and the COD removal rate is 89.5%, the heavy metal Zn removal rate is 95.2% and the ammonia nitrogen removal rate is 66.2% by calculation.
Example 7
Taking 5L of pre-washing tower liquid for main component analysis, wherein the pre-washing tower liquid contains 66.82g/L Zn, 6268mg/L ammonia nitrogen and 2998mg/L COD, adding sodium hydroxide to adjust the pH of the pre-washing liquid to 10, stirring for neutralization reaction for 60min, filtering by using a vacuum pump to obtain filtrate, placing the filtrate under a flotation machine, wherein the ozone concentration is 100mg/L, and fully contacting and reacting the ozone with the filtrate for 4h after the ozone is dispersed by the flotation machine.
After the reaction, a reaction solution is obtained, and the reaction solution is subjected to component analysis, wherein the reaction solution contains 2.89g/L of Zn, 2101mg/L of ammonia nitrogen and 289mg/L of COD, and the COD removal rate is 90.4%, the heavy metal Zn removal rate is 95.7%, and the ammonia nitrogen removal rate is 66.5% by calculation.
In conclusion, the invention provides a method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment, which comprises the following steps: adding an alkaline substance into the wastewater, adjusting the pH value of the wastewater, and carrying out a neutralization reaction to obtain a mixed solution; filtering the mixed solution to obtain filter residue and filtrate; introducing ozone into the filtrate to carry out oxidation reaction to obtain ozone-oxidized wastewater; and after being dispersed by a flotation machine, the ozone is contacted with the filtrate to carry out oxidation reaction. The waste water is made alkaline by adding alkaline substances into the waste water, and the waste water is neutralized under alkaline conditions, so that part of heavy metal ions in the waste water are precipitated and removed after filtration, and then ozone is introduced into the filtrate for ozone oxidation, so that COD in the filtrate is removed, good conditions are created for subsequent sewage treatment procedures, and the treatment capacity of subsequent sewage is improved. Meanwhile, the treatment method has simple process and easy operation.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (8)
1. A method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment is characterized by comprising the following steps:
adding an alkaline substance into the wastewater, adjusting the pH value of the wastewater, and carrying out a neutralization reaction to obtain a mixed solution;
filtering the mixed solution to obtain filter residue and filtrate;
introducing ozone into the filtrate to carry out oxidation reaction to obtain ozone-oxidized wastewater; and after being dispersed by a flotation machine, the ozone is contacted with the filtrate to carry out oxidation reaction.
2. The method for removing COD in flue gas wastewater of a zinc leaching residue rotary kiln by ozone pretreatment according to claim 1, wherein the pH value of the wastewater is adjusted and controlled to be more than 8.
3. The method for removing COD in the flue gas wastewater of the rotary kiln for zinc leaching residues through ozone pretreatment according to claim 1, wherein the neutralization reaction time is 30-60 min.
4. The method for removing COD in the rotary kiln flue gas wastewater after zinc leaching residues through ozone pretreatment according to claim 1, wherein the concentration of the ozone is 90mg/L-100 mg/L.
5. The method for removing COD in the flue gas wastewater of the zinc leaching residue rotary kiln by ozone pretreatment according to claim 1, wherein the alkaline substance is lime water or sodium hydroxide.
6. The method for removing COD in rotary kiln flue gas wastewater from zinc leaching residues by ozone pretreatment according to claim 1, wherein the COD of the wastewater oxidized by ozone is less than or equal to 200 mg/L.
7. The method for removing COD in rotary kiln flue gas wastewater in zinc leaching residues through ozone pretreatment according to claim 1, wherein the reaction time of the oxidation reaction is 1-4 hours.
8. The method for removing COD in smoke wastewater of a zinc leaching residue rotary kiln by ozone pretreatment according to claim 1, wherein the step of introducing ozone into the filtrate for oxidation reaction to obtain ozone-oxidized wastewater specifically comprises:
and introducing ozone into the filtrate for oxidation reaction, and continuously adding the alkaline substance in the oxidation reaction process to ensure that the pH value of the filtrate is 9-10.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01135587A (en) * | 1987-11-19 | 1989-05-29 | Yoshitama Seito Kk | Method for treating waste liquid of chemical plating |
| CN101186402A (en) * | 2007-11-27 | 2008-05-28 | 华泰集团有限公司 | Fenton two-stage method oxidation processing technique for paper-making pulping waste water |
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