CN110950502A - Method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid - Google Patents
Method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid Download PDFInfo
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- ferricyanide
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- -1 potassium ferricyanide Chemical compound 0.000 title claims abstract description 69
- 239000002351 wastewater Substances 0.000 title claims abstract description 58
- 239000007788 liquid Substances 0.000 title claims abstract description 54
- 239000002699 waste material Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005530 etching Methods 0.000 title claims abstract description 33
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 title claims abstract description 33
- 238000001704 evaporation Methods 0.000 claims abstract description 19
- 230000001112 coagulating effect Effects 0.000 claims abstract description 18
- 238000004062 sedimentation Methods 0.000 claims abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 15
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000011033 desalting Methods 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000000706 filtrate Substances 0.000 claims abstract description 7
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012153 distilled water Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims abstract description 6
- 238000004821 distillation Methods 0.000 claims abstract description 4
- 239000012065 filter cake Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000010979 pH adjustment Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- 239000010865 sewage Substances 0.000 claims abstract description 4
- 238000005189 flocculation Methods 0.000 claims abstract 2
- 230000016615 flocculation Effects 0.000 claims abstract 2
- 239000010949 copper Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 231100000331 toxic Toxicity 0.000 claims description 3
- 230000002588 toxic effect Effects 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000012141 concentrate Substances 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 150000002500 ions Chemical group 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 231100000252 nontoxic Toxicity 0.000 abstract description 4
- 230000003000 nontoxic effect Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 238000010612 desalination reaction Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- UZUJHVIPEZFEKR-UHFFFAOYSA-L iron(2+);dicyanate Chemical compound [Fe+2].[O-]C#N.[O-]C#N UZUJHVIPEZFEKR-UHFFFAOYSA-L 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000003403 water pollutant Substances 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- YAGKRVSRTSUGEY-UHFFFAOYSA-Q hydron;iron(3+);hexacyanide Chemical compound [H+].[H+].[H+].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-Q 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000010891 toxic waste Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—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
- C02F1/02—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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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- 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
- C02F2103/12—Nature of the water, waste water, sewage or sludge to be treated from the silicate or ceramic industries, e.g. waste waters from cement or glass factories
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to a method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid, which comprises the following steps: (1) mean value blending, coagulating sedimentation: utilizing a large amount of H +, Cu2+ and Fe2+ contained in the ferric trichloride etching waste liquid to carry out pH adjustment, mixed flocculation and precipitation on the potassium ferricyanide-containing waste water; (2) solid-liquid separation: adopting a filter press to carry out solid-liquid separation on ferricyanide and ferricyanide precipitates formed by ferricyanide ions and ferricyanide ions in the potassium ferricyanide-containing wastewater, sending filter cakes to a metal sludge treatment working section, and sending filtrate to an evaporation desalting device after collecting the filtrate; (3) evaporation desalting: evaporating, concentrating, crystallizing and desalting the filtered clear liquid by using a triple-effect evaporator; (4) biochemical treatment: and the condensed distilled water after the distillation treatment of the triple-effect evaporator is combined with the domestic sewage and enters a UCT-MBR combined process biochemical treatment system. The method realizes the non-toxic and harmless treatment of the ferric trichloride etching waste liquid and the potassium ferricyanide waste water, and avoids environmental pollution.
Description
Technical Field
The invention belongs to the technical field of harmless treatment and resource utilization of hazardous wastes, and particularly relates to a method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid.
Background
When glass processing enterprises manufacture products, such as glass lenses, glass watchcases, mobile phone glass screens and the like, a cleaning process is needed after silk-screen printing of glass finished products, and a detergent of the glass finished products is usually a mixed solution prepared by proportioning potassium ferricyanide, so that a certain amount of waste water containing potassium ferricyanide is generated in the production process of the enterprises. The pollutants in the wastewater mainly comprise CODCrPotassium ferricyanide and SS are the main components, and the wastewater is alkaline and has poor biodegradability. Although the water quality and the pollutant amount of the production wastewater are small, the concentration of the pollutant is high, the toxicity is high, and the emission standard is difficult to reach by adopting the traditional method.
At present, the industrial treatment process aiming at the cyanide-containing waste liquid mainly comprises a two-stage chlor-alkali oxidation method, an electrolysis method and the like; aiming at the problem that few patents exist in the treatment of potassium ferricyanide wastewater at present, the traditional treatment process also adopts a chlor-alkali oxidation method, an electrolysis method and the like. A method for treating waste water containing potassium ferricyanide with publication number CN106698788A comprises the following steps: adding an aluminum sheet into the potassium ferricyanide-containing wastewater, standing until no bubbles are generated in the wastewater, and filtering after reaction to obtain a solution A; adding an iron precipitation agent into the solution A for reaction, and filtering; treating the sludge with cyanogen-containing sludge, and filtering to obtain a solution B; the solution B is merged into a wastewater treatment system, and finally the discharged wastewater reaches the national wastewater discharge standard. The invention is characterized in that aluminum is pretreated, and then an iron precipitation agent is added to completely precipitate potassium ferricyanide; the treatment cost is increased, and meanwhile, hydrogen generated by the reaction can cause certain harm to the environment.
Aiming at the complex characteristics of the treatment of the ferric trichloride etching waste liquid and the waste water containing potassium ferricyanide, the method adopts the synergistic treatment of the mean value allocation, the coagulating sedimentation, the solid-liquid separation, the evaporation desalination and the biochemical combination process, thereby realizing the harmless treatment and the resource utilization of the ferric trichloride etching waste liquid, realizing the non-toxic and harmless treatment of the potassium ferricyanide waste liquid, finally realizing the standard discharge of the waste water, achieving the purpose of treating waste by waste, saving the treatment cost and avoiding the environmental pollution.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a method for treating ferric trichloride etching waste liquid and potassium ferricyanide-containing waste water, which adopts a mean value blending-coagulating sedimentation-solid-liquid separation-evaporation desalting-biochemical combined process to cooperatively treat toxic waste water with potassium ferricyanide as a main component. Mainly solves the following problems: (1) the conventional method has high cost for treating the ferric trichloride etching waste liquid; (2) the conventional method has high cost for treating the waste water containing potassium ferricyanide; (3) the operation requirement is high, and the treatment cost is high.
The purpose of the invention is realized by the following technical scheme: a method for cooperatively treating waste water containing potassium ferricyanide by utilizing ferric trichloride etching waste liquid mainly aims at the ferric trichloride etching waste liquid and the waste water containing the potassium ferricyanide, namely the iron content is not lower than 20 percent (w percent), the potassium ferricyanide content is not lower than 0.5 percent (w percent), and adopts the cooperative treatment of mean value allocation, coagulating sedimentation, solid-liquid separation, evaporation desalination and biochemical combined technology, and the method comprises the following specific steps:
(1) mean value blending, coagulating sedimentation: the main components in the ferric trichloride etching waste liquid are waste acid and metal ion Cu2+、Fe2+Etc. prior to effective utilization of H+Adjusting the pH value of the potassium ferricyanide-containing wastewater to 5-9, and then recycling Cu2+、Fe2+Under the coagulating sedimentation action, ferricyanide ions and ferricyanide precipitates are formed by ferricyanide ions and ferricyanide ions in the potassium ferricyanide-containing wastewater, so that the non-toxic and harmless treatment of the potassium ferricyanide wastewater is achieved. The adding proportion (w/w) of the ferric trichloride etching waste liquid and the potassium ferricyanide waste water is controlled to be (1-5): 8. the removal efficiency of the ferricyanide in the potassium ferricyanide waste water can reach more than 99 percent through the coagulating sedimentation reaction, and the Cu in the ferric trichloride etching waste liquid2+、Fe2+The removal rate can reach 95 percent.
(2) Solid-liquid separation: and (3) forming iron ferricyanide and copper ferricyanide precipitates from ferricyanide ions in the potassium ferricyanide-containing wastewater by using a filter press, carrying out solid-liquid separation, sending a filter cake to a metal sludge treatment section, and sending the collected filtrate to an evaporation desalting device.
(3) Evaporation desalting: the clear liquid after filtration treatment is evaporated, concentrated, crystallized and desalted by using the triple-effect evaporator, the process not only can achieve the purpose of concentration and desalting, but also can remove the toxic component, namely iron cyanate, in the wastewater in a deeper step, and provide powerful guarantee for non-toxicity and harmlessness.
(4) Biochemical treatment: the condensed distilled water after the distillation treatment of the triple-effect evaporator is combined with the domestic sewage and enters a UCT-MBR combined process biochemical treatment system, and the final treatment is carried out until the primary standard of the second time period DB44/26-2001 of Guangdong province water pollutant discharge limit standard is reached. The biochemical treatment process can also adopt A2an/O-MBR treatment process or the like.
The treatment effect of the invention is as follows: the invention utilizes ferric trichloride etching waste liquid to cooperatively treat potassium ferricyanide-containing waste water, adopts a mean value allocation-coagulating sedimentation-solid-liquid separation-evaporation desalination-biochemical combined process, has the characteristics of stable operation, convenient management, low operation cost, stable and standard-reaching waste water and the like, can greatly reduce the pollution of the ferric trichloride etching waste liquid and the potassium ferricyanide-containing waste water to the environment in production and application, achieves the aim of treating waste by waste, and has good environmental benefit and social benefit.
Drawings
FIG. 1 is a block diagram of a specific process of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The invention provides a method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid, which comprises the following steps as shown in figure 1:
(1) mean value blending, coagulating sedimentation: the main components in the ferric trichloride etching waste liquid are waste acid and metal ion Cu2+、Fe2+Etc. prior to effective utilization of H+Adjusting the pH value of the potassium ferricyanide-containing wastewater to 5-9, and then recycling Cu2+、Fe2+Under the coagulating sedimentation action, ferricyanide ions and ferricyanide precipitates are formed by ferricyanide ions and ferricyanide ions in the potassium ferricyanide-containing wastewater, so that the non-toxic and harmless treatment of the potassium ferricyanide wastewater is achieved. The adding proportion (w/w) of the ferric trichloride etching waste liquid and the potassium ferricyanide waste water is controlled to be (1-5): 8. ferricyanic acid in potassium ferricyanide wastewater through coagulating sedimentation reactionThe root removal efficiency can reach more than 99 percent, and Cu in the ferric trichloride etching waste liquid2+、Fe2+The removal rate can reach 95 percent.
(2) Solid-liquid separation: and (3) forming iron ferricyanide and copper ferricyanide precipitates from ferricyanide ions in the potassium ferricyanide-containing wastewater by using a filter press, carrying out solid-liquid separation, sending a filter cake to a metal sludge treatment section, and sending the collected filtrate to an evaporation desalting device.
(3) Evaporation desalting: the clear liquid after filtration treatment is evaporated, concentrated, crystallized and desalted by using the triple-effect evaporator, the process not only can achieve the purpose of concentration and desalting, but also can remove the toxic component, namely iron cyanate, in the wastewater in a deeper step, and provide powerful guarantee for non-toxicity and harmlessness.
(4) Biochemical treatment: the condensed distilled water after the distillation treatment of the triple-effect evaporator is combined with the domestic sewage and enters a UCT-MBR combined process biochemical treatment system, and the final treatment is carried out until the primary standard of the second time period DB44/26-2001 of Guangdong province water pollutant discharge limit standard is reached. The biochemical treatment process can also adopt A2an/O-MBR treatment process or the like.
Example 1
Taking 11.4t of potassium ferricyanide-containing wastewater of a certain glass product manufacturing enterprise, and analyzing the content of ferricyanide in a raw material liquid to be about 0.512 percent (w percent); ferric trichloride etching waste liquor Fe of certain electronic factory2+About 21.3% (w%) Cu2+The content is about 0.3 percent (w percent), and the treatment is carried out by adopting the combined process of mean value blending, coagulating sedimentation, solid-liquid separation, evaporation desalination and biochemistry.
Through coagulating sedimentation treatment, the adding proportion (w/w) of the ferric trichloride etching waste liquid and the potassium ferricyanide waste water is controlled to be 3: 8, carrying out pH adjustment and coagulation treatment, carrying out full-weight pressure filtration after coagulating sedimentation, wherein the content of iron cyanate is about 3.48mg/L, and Cu is2+The content is about 2.16mg/L, and the removal rate of ferricyanide is about 99.9%. After triple effect evaporation and desalination treatment, iron cyanate ions and Cu in distilled water2+None was detected.
Example 2
Taking 7.43t of potassium ferricyanide wastewater from a certain plant, and analyzing the content of the ferricyanide in the raw material liquid to be about 0.306 percent (w percent); adopts the combined technology of mean value blending, coagulating sedimentation, solid-liquid separation, evaporation desalination and biochemistry to process.
Through coagulating sedimentation treatment, the adding proportion (w/w) of the ferric trichloride etching waste liquid and the potassium ferricyanide waste water is controlled to be 5: 8, carrying out pH adjustment and coagulation treatment, carrying out full-weight pressure filtration after coagulating sedimentation, wherein the content of iron cyanate is about 0.15mg/L, and Cu is2+The content is about 15.3mg/L, and the removal rate of ferricyanide is about 99.9%. After triple effect evaporation and desalination treatment, iron cyanate ions and Cu in distilled water2+None was detected.
The core innovation of the process is that ferric trichloride etching waste liquid is utilized to cooperatively treat potassium ferricyanide-containing waste water from different sources, the harm of hazardous waste ferric trichloride etching waste liquid and potassium ferricyanide-containing waste water to the environment is respectively eliminated, the waste is treated by waste, and the treatment cost of hazardous waste is reduced. The method has the characteristics of stable operation, convenient management, low operation cost, high standard-reaching rate of the wastewater and the like.
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (3)
1. A method for cooperatively treating potassium ferricyanide-containing wastewater by utilizing ferric trichloride etching waste liquid is characterized by comprising the following steps:
(1) mean value blending, coagulating sedimentation: utilizing a large amount of H contained in ferric trichloride etching waste liquid+、Cu2+、Fe2+Carrying out pH adjustment, mixed flocculation and precipitation on the potassium ferricyanide-containing wastewater;
(2) solid-liquid separation: adopting a filter press to carry out solid-liquid separation on ferricyanide and ferricyanide precipitates formed by ferricyanide ions and ferricyanide ions in the potassium ferricyanide-containing wastewater, sending filter cakes to a metal sludge treatment working section, and sending filtrate to an evaporation desalting device after collecting the filtrate;
(3) evaporation desalting: evaporating, concentrating, crystallizing and desalting the filtered clear liquid by using a triple-effect evaporator;
(4) biochemical treatment: and the condensed distilled water after the distillation treatment of the triple-effect evaporator is combined with the domestic sewage and enters a UCT-MBR combined process biochemical treatment system.
2. The method for co-processing potassium ferricyanide-containing wastewater by using ferric trichloride etching waste liquid as claimed in claim 1, wherein in the coagulating sedimentation process of step (1), after the potassium ferricyanide wastewater is fed into the reaction kettle, the ferric trichloride etching waste liquid is added into the reaction kettle as a production auxiliary material, the pH of the potassium ferricyanide wastewater is adjusted to 5-9 by using the ferric trichloride etching waste liquid, and then Cu is used2+、Fe2+Under the coagulating sedimentation effect of metal ions, ferricyanide ions form ferricyanide blue sediment and ferricyanide copper yellow sediment, and the adding proportion (w/w) of ferric trichloride etching waste liquid and potassium ferricyanide waste water is controlled to be (1-5): 8.
3. the method for utilizing ferric trichloride etching waste liquid to cooperatively treat potassium ferricyanide-containing wastewater as claimed in claim 1, wherein in the evaporation desalting treatment step of step (3), a three-effect evaporator is adopted to evaporate, concentrate, crystallize and desalt the filtrate, and compounds obtained by chemical conversion in the wastewater are all produced in the form of crystallized salts, so that the water inlet requirement of back-end biochemical treatment is ensured, and toxic and harmful components in the wastewater are further removed.
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| WO2022039182A1 (en) * | 2020-08-19 | 2022-02-24 | 栗田工業株式会社 | Method and apparatus for treating cyanogen-containing water |
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| CN85102714A (en) * | 1985-04-07 | 1986-03-10 | 国营惠丰机械厂 | Handle the serous cellulose xanthate method of electroplating wastewater |
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| CN115916709A (en) * | 2020-08-19 | 2023-04-04 | 栗田工业株式会社 | Method and apparatus for treating cyanide-containing water |
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