CN114180753A - Method for treating wastewater containing cyanide and oxalate - Google Patents
Method for treating wastewater containing cyanide and oxalate Download PDFInfo
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- CN114180753A CN114180753A CN202111459133.1A CN202111459133A CN114180753A CN 114180753 A CN114180753 A CN 114180753A CN 202111459133 A CN202111459133 A CN 202111459133A CN 114180753 A CN114180753 A CN 114180753A
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- wastewater
- cyanide
- oxalate
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- 239000002351 wastewater Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 29
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims abstract description 27
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000008394 flocculating agent Substances 0.000 claims abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- 125000000129 anionic group Chemical group 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 2
- 229910001448 ferrous ion Inorganic materials 0.000 abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- 150000002500 ions Chemical class 0.000 abstract description 4
- 239000002244 precipitate Substances 0.000 abstract description 4
- PANJMBIFGCKWBY-UHFFFAOYSA-N iron tricyanide Chemical compound N#C[Fe](C#N)C#N PANJMBIFGCKWBY-UHFFFAOYSA-N 0.000 abstract description 3
- -1 oxalate ions Chemical class 0.000 abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
- 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 description 12
- 238000004065 wastewater treatment Methods 0.000 description 10
- 239000000706 filtrate Substances 0.000 description 8
- 239000006228 supernatant Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000010170 biological method Methods 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000003295 industrial effluent Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 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
- C02F1/001—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
- C02F1/52—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
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
-
- 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
- C02F2101/34—Organic compounds containing oxygen
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a method for treating wastewater containing cyanide and oxalate, which comprises the steps of firstly adjusting the pH value of the wastewater, then sequentially adding ferrite and a flocculating agent into the wastewater, standing and settling, then filtering, sequentially adding an alkali treating agent and a flocculating agent, carrying out solid-liquid separation, and adjusting the pH value of the wastewater again. In the treatment method, under the condition of weak acidity to weak alkalinity, excessive ferrous ions are added firstly, so that the ferrous ions are fully combined with iron cyanide, ferrous cyanide and oxalate ions in the wastewater to generate precipitates, and then the aim of removing cyanide and organic matters is fulfilled through solid-liquid separation. Then adding a proper amount of alkaline reagent to enable hydroxide radicals to react with heavy metal ions and excessive ferrous ions in the wastewater to generate precipitate, and carrying out solid-liquid separation to achieve the aim of removing the heavy metal ions.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for treating cyanide and oxalate-containing wastewater.
Background
Cyanide is often present in various forms in various industrial effluents for electroplating, metallurgy, coking, metal processing, etc. Because of the toxicity of cyanide to human bodies and natural water ecosystems, the total cyanide concentration in the sewage discharged by general enterprises specified in the relevant sewage comprehensive discharge standard is not more than 0.5 mg/L.
The existing methods for treating cyanide mainly comprise chemical oxidation, physical-chemical, biological treatment, natural degradation, high-pressure hydrolysis, membrane separation, radiation, ion exchange and the like. Among cyanide compounds of different forms, cyanide compounds complexed with metal ions, such as ferricyanide and ferrocyanide, have relatively low toxicity and very high stability, and are difficult to remove by common chemical oxidation methods and difficult to decompose by microorganisms in biological treatment methods. If the cyanogen-containing complex enters a complex environmental water body and meets dilute acid or stronger complexing agent, the cyanogen-containing complex reacts to release virulent CN-. Therefore, the research of many researchers is focused on the method for treating ferricyanide and ferrocyanide which is economical and efficient.
Oxalic acid is commonly used as a complexing agent, a reducing agent and the like in chemical and pharmaceutical industries, and influences COD of wastewater in the form of organic matters in the wastewater. Organic matter is also a subject of frequent concern in wastewater treatment. The conventional methods for treating organic substances include chemical oxidation, physical adsorption, biological treatment, and the like. However, the chemical oxidation method and the physical adsorption method generally have high treatment cost and long treatment period of the biological method, and particularly when the wastewater contains components such as cyanide or heavy metal which inhibit the growth of microorganisms, the biological method has low efficiency of treating organic matters.
In the related art, there is no method capable of treating wastewater containing both iron cyanide complex and oxalate-based organic matter. Therefore, the development of a comprehensive sewage treatment method with low treatment cost and high treatment efficiency is an urgent problem to be solved in the current industrial wastewater treatment.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems in the prior art. Therefore, the invention provides a method for treating wastewater containing cyanide and oxalate, which can efficiently and quickly treat wastewater containing ferricyanide, ferrocyanide and oxalate.
The first aspect of the invention provides a method for treating cyanide and oxalate containing wastewater, which comprises the following steps:
s1: adjusting the pH value of the wastewater to 5-8;
s2: sequentially adding ferrous salt and a flocculating agent into the wastewater, standing and settling, and filtering;
s3: and (4) sequentially adding an alkali treatment agent and a flocculating agent into the wastewater filtered in the step (S2), carrying out solid-liquid separation, and adjusting the pH of the wastewater to 6-9.
The invention relates to a technical scheme in a method for treating cyanide and oxalate-containing wastewater, which at least has the following beneficial effects:
in the treatment method, under the condition of weak acidity to weak alkalinity, excessive ferrous ions are added firstly, so that the ferrous ions are fully combined with iron cyanide, ferrous cyanide and oxalate ions in the wastewater to generate precipitates, and then the aim of removing cyanide and organic matters is fulfilled through solid-liquid separation. Then adding a proper amount of alkaline reagent to enable hydroxide radicals to react with heavy metal ions and excessive ferrous ions in the wastewater to generate precipitate, and carrying out solid-liquid separation to achieve the aim of removing the heavy metal ions.
The treatment method can simultaneously treat ferricyanide, ferrocyanide and oxalate ions in the wastewater, is efficient and rapid, and after treatment, the total cyanide content in the wastewater is as low as 0.5mg/L, the chemical oxygen demand is as low as 500mg/L, and Mn is2+The content is as low as 0.5mg/L and meets GB8978 standardAnd determining the discharge requirement of the third-level standard.
The treatment method of the invention has the advantages of common and easily obtained used reagents, no need of expensive equipment investment, low cost and easy popularization.
According to some embodiments of the invention, the total cyanide content in the waste water containing cyanide and oxalate is 40 mg/L to 900mg/L, the chemical oxygen demand is 2000mg/L to 5000mg/L, and Mn is added2+The content is 50 mg/L-300 mg/L.
According to some embodiments of the present invention, after the treatment of step S3, the total cyanide content in the wastewater is less than or equal to 0.5mg/L, the chemical oxygen demand is less than or equal to 500mg/L, and Mn is present in the wastewater2+The content is less than or equal to 0.5 mg/L.
According to some embodiments of the invention, the reagent used to adjust the pH of the wastewater in step S1 includes at least one of sulfuric acid or hydrochloric acid.
According to some embodiments of the invention, the ferrous salt comprises at least one of ferrous sulfate, ferrous chloride, and ferrous nitrate.
According to some embodiments of the present invention, in step S2, the ferrous salt is added in an amount of 0.25 to 8 times of the chemical oxygen demand of the wastewater.
According to some embodiments of the present invention, the wastewater is subjected to a stirring treatment before standing and settling in step S2.
According to some embodiments of the invention, the flocculant is anionic polyacrylamide in a concentration of 0.5 to 1.5 parts per thousand.
According to some embodiments of the invention, the flocculant is an anionic polyacrylamide with a concentration of 1% o.
According to some embodiments of the invention, in step S3, the alkali treatment agent includes at least one of calcium hydroxide and sodium hydroxide.
According to some embodiments of the present invention, in step S3, the alkali treatment agent is added in an amount of 15 to 30 times the chemical oxygen demand of the wastewater.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
Example 1
The embodiment treats wastewater containing ferricyanide, ferrocyanide and oxalate, and specifically comprises the following steps:
taking 200mL of wastewater containing ferricyanide, ferrocyanide and oxalate, and adding 15% dilute sulfuric acid to adjust the pH of the wastewater to 6-7;
then adding 0.7g of ferrous sulfate heptahydrate, stirring and reacting for 60min, adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, and standing and settling to obtain a filtrate;
adding 12.5g of calcium hydroxide powder into the filtrate to stabilize the pH value of the wastewater at 12-13, stirring for reacting for 60min, then adding 1mL of 1 thousandth anionic polyacrylamide, stirring for 20min, carrying out solid-liquid separation, taking supernatant, adding 15% dilute sulfuric acid into the supernatant to adjust the pH value of the wastewater to 7.6, and discharging the wastewater.
The main components before and after the wastewater treatment are shown in Table 1. The tests were according to the standards GB8978, GB11911, HJ484 and HJ/T399.
Table 1 example 1 main components before and after wastewater treatment
| Water sample | CNT(mg/L) | COD(mg/L) | Mn2+(mg/L) | pH |
| Before treatment | 86.94 | 2856 | 251.16 | 8.7 |
| After treatment | 0.12 | 128 | 0.13 | 7.6 |
In Table 1, CNTRefers to the total cyanide (total cyanide) in the wastewater, and COD refers to the Chemical Oxygen Demand (Chemical Oxygen Demand) in the wastewater.
Example 2
The embodiment treats wastewater containing ferricyanide, ferrocyanide and oxalate, and specifically comprises the following steps:
taking 250mL of wastewater containing ferricyanide, ferrocyanide and oxalate, and adding 15% dilute sulfuric acid to adjust the pH of the wastewater to 6-7;
adding 1.4g of ferrous sulfate heptahydrate, stirring for reacting for 60min, adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, and standing for settling to obtain filtrate;
then adding 20g of calcium hydroxide powder into the filtrate to stabilize the pH value of the wastewater at 12-13, stirring for reacting for 60min, then adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, performing solid-liquid separation, and taking the supernatant. Adding 15% dilute sulfuric acid into the supernatant to adjust the pH of the wastewater to 7.0, and discharging the wastewater.
The main components before and after the wastewater treatment are shown in Table 2.
Table 2 example 2 main components before and after wastewater treatment
| Water sample | CNT(mg/L) | COD(mg/L) | Mn2+(mg/L) | pH |
| Before treatment | 744.5 | 3909 | 159.8 | 8.6 |
| After treatment | 0.08 | 257 | 0.12 | 7.0 |
Example 3
The embodiment treats wastewater containing ferricyanide, ferrocyanide and oxalate, and specifically comprises the following steps:
taking 200mL of wastewater containing ferricyanide, ferrocyanide and oxalate, and adding 15% dilute sulfuric acid to adjust the pH of the wastewater to 6-7;
then adding 18g of ferrous sulfate heptahydrate, stirring and reacting for 60min, then adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, standing and settling to obtain a filtrate;
adding 3mL of 4% sodium hydroxide solution into the filtrate to stabilize the pH value of the wastewater at 12-13, stirring for reacting for 60min, then adding 1mL of 1% anionic polyacrylamide, stirring for 20min, performing solid-liquid separation, taking supernatant, adding 15% dilute sulfuric acid into the supernatant to adjust the pH value of the wastewater to 7.5, and discharging the wastewater.
The main components before and after the wastewater treatment are shown in Table 3.
Table 3 example 3 main components before and after wastewater treatment
| Water sample | CNT(mg/L) | COD(mg/L) | Mn2+(mg/L) | pH |
| Before treatment | 718.9 | 3303 | 114.61 | 8.5 |
| After treatment | 0.19 | 385 | 0.1 | 7.5 |
Comparative example
The comparative example treats wastewater containing ferricyanide, ferrocyanide and oxalate, and specifically comprises the following steps:
taking 250mL of wastewater containing ferricyanide, ferrocyanide and oxalate, and adding 15% dilute sulfuric acid to adjust the pH of the wastewater to 6-7;
then adding 0.8g of ferrous sulfate heptahydrate, stirring and reacting for 60min, then adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, standing and settling to obtain a filtrate;
adding 20g of calcium hydroxide powder into the filtrate to stabilize the pH value of the wastewater at 12-13, stirring for reacting for 60min, then adding 1mL of 1 ‰ anionic polyacrylamide, stirring for 20min, performing solid-liquid separation, taking supernatant, adding 15% dilute sulfuric acid into the supernatant to adjust the pH value of the wastewater to 7.0, and discharging the wastewater.
The main components before and after the wastewater treatment are shown in Table 4.
TABLE 4 comparative examples main components before and after wastewater treatment
In the comparative example, the added amount of ferrous ions was less than 0.25 times COD (the COD content in the present comparative example was 3348 × 0.25 ═ 837mg, the relative molecular mass of ferrous sulfate heptahydrate was 278.05, the average relative atomic mass of iron element was 55.845, the added amount of ferrous ions was 0.8 × 1000 × 55.845 ÷ 278.05 ═ 160.68mg, 160.68 ÷ 837 ÷ 0.19 < 0.25.), and the total cyanide concentration in the wastewater could not be treated to 0.5mg/L or less.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A method for treating cyanide and oxalate-containing wastewater is characterized by comprising the following steps:
s1: adjusting the pH value of the wastewater to 5-8;
s2: sequentially adding ferrous salt and a flocculating agent into the wastewater, standing and settling, and filtering;
s3: and (4) sequentially adding an alkali treatment agent and a flocculating agent into the wastewater filtered in the step (S2), carrying out solid-liquid separation, and adjusting the pH of the wastewater to 6-9.
2. The method as claimed in claim 1, wherein the total cyanide content in the waste water is 40 mg/L-900 mg/L, the chemical oxygen demand is 2000 mg/L-5000 mg/L, and Mn is added2+The content is 50 mg/L-300 mg/L.
3. The method as claimed in claim 1, wherein the total cyanide content in the wastewater after the treatment in step S3 is less than or equal to 0.5mg/L, the chemical oxygen demand is less than or equal to 500mg/L, and Mn is less than or equal to Mn2+The content is less than or equal to 0.5 mg/L.
4. The method as claimed in any one of claims 1 to 3, wherein the reagent for adjusting the pH of the wastewater in step S1 comprises at least one of sulfuric acid or hydrochloric acid.
5. The method as claimed in any one of claims 1 to 3, wherein the ferrous salt comprises at least one of ferrous sulfate, ferrous chloride and ferrous nitrate.
6. The method as claimed in any one of claims 1 to 3, wherein in step S2, the amount of the ferrous salt added is 0.25 to 8 times the chemical oxygen demand of the wastewater.
7. The method according to any one of claims 1 to 3, wherein the wastewater is subjected to stirring treatment before standing and settling in step S2.
8. The method for treating cyanide and oxalate containing wastewater according to any one of claims 1 to 3, wherein the flocculant is anionic polyacrylamide with a concentration of 0.5 to 1.5 ‰.
9. The method according to any one of claims 1 to 3, wherein in step S3, the alkali treatment agent comprises at least one of calcium hydroxide and sodium hydroxide.
10. The method according to any one of claims 1 to 3, wherein the amount of the alkali treatment agent added is 15 to 30 times the chemical oxygen demand of the wastewater in step S3.
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| CN202111459133.1A CN114180753A (en) | 2021-12-01 | 2021-12-01 | Method for treating wastewater containing cyanide and oxalate |
| PCT/CN2022/116260 WO2023098190A1 (en) | 2021-12-01 | 2022-08-31 | Treatment method for wastewater containing cyanide and oxalate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115043475A (en) * | 2022-05-31 | 2022-09-13 | 广东邦普循环科技有限公司 | Treatment method of wastewater containing iron-cyanogen complex and oxalate |
| CN115124165A (en) * | 2022-06-30 | 2022-09-30 | 赣州福默斯科技有限公司 | Comprehensive utilization method of oxalic acid wastewater |
| WO2023098190A1 (en) * | 2021-12-01 | 2023-06-08 | 湖南邦普循环科技有限公司 | Treatment method for wastewater containing cyanide and oxalate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023098190A1 (en) * | 2021-12-01 | 2023-06-08 | 湖南邦普循环科技有限公司 | Treatment method for wastewater containing cyanide and oxalate |
| CN115043475A (en) * | 2022-05-31 | 2022-09-13 | 广东邦普循环科技有限公司 | Treatment method of wastewater containing iron-cyanogen complex and oxalate |
| CN115043475B (en) * | 2022-05-31 | 2023-06-13 | 广东邦普循环科技有限公司 | Treatment method of wastewater containing iron-cyanide complex and oxalate |
| WO2023231507A1 (en) * | 2022-05-31 | 2023-12-07 | 广东邦普循环科技有限公司 | Treatment method for wastewater containing ferricyanide complex and oxalate |
| DE112023000058T5 (en) | 2022-05-31 | 2024-02-29 | Guangdong Brunp Recycling Technology Co., Ltd. | WASTEWATER TREATMENT PROCESS CONTAINING A FERRICYANIDE COMPLEX AND OXALATE |
| GB2622319A (en) * | 2022-05-31 | 2024-03-13 | Guangdong Brunp Recycling Technology Co Ltd | Treatment method for wastewater containing ferricyanide complex and oxalate |
| CN115124165A (en) * | 2022-06-30 | 2022-09-30 | 赣州福默斯科技有限公司 | Comprehensive utilization method of oxalic acid wastewater |
| CN115124165B (en) * | 2022-06-30 | 2024-04-30 | 赣州福默斯科技有限公司 | Comprehensive utilization method of oxalic acid wastewater |
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| WO2023098190A1 (en) | 2023-06-08 |
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