CN110759393A - Cyanogen removing agent and preparation method and application thereof - Google Patents
Cyanogen removing agent and preparation method and application thereof Download PDFInfo
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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
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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Abstract
The invention provides a cyanogen removing agent, a preparation method and application thereof, wherein the cyanogen removing agent comprises activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O and polyacrylamide; FeSO in the invention4·7H2O and polyferric sulfate have better flocculation effect in water; SnCl4、CuSO4·5H2O and Co (NO)3)2·6H2O is heavy metal salt, and can be complexed with inorganic cyanide in the coking wastewater to form a strong complex compound; the flocculation speed of the coking wastewater is improved and the settling time is effectively shortened by the synergistic effect of the polyaluminium chloride and the polyacrylamide; the adsorption effect on organic matters such as pigments and the like in the coking wastewater is realized by adopting the activated carbon, and the adsorption on cyanide which is not subjected to complexation is realized after the activated carbon is compounded with the ferric salt and the heavy metal salt, so that the cyanogen removal effect is enhanced; the cyanogen removing agent disclosed by the invention is cheap in raw materials and wide in acquisition route, and has the advantages of small dosage, quick response, obvious cyanogen removing effect, high settling speed and the like.
Description
Technical Field
The invention relates to the technical field of coking wastewater treatment, and particularly relates to a cyanogen removing agent, and a preparation method and application thereof.
Background
The coking wastewater is organic wastewater containing pollutants such as phenol, cyanogen, oil, ammonia and the like generated by a coking plant, and has the characteristics of large discharge amount, strong toxicity, difficult degradation and the like. At present, coking wastewater is generally purified by a three-step method of pretreatment, biochemical treatment and post-treatment. Pretreatment mainly removes most of oil, phenols and other substances, and biochemical treatment mainly removes ammonia nitrogen and COD in wastewater; the total cyanide of the effluent after pretreatment and biochemical treatment is 3-5 mg/L; the existing post-treatment means has the defects of large material feeding amount, low treatment efficiency, high concentration of effluent pollutants, incapability of reaching the discharge standard and the like for removing cyanides.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a cyanide remover and a preparation method and application thereof, aiming at solving the technical problems of large material input, low treatment efficiency, high effluent pollutant concentration and effluent which can not reach the discharge standard in the existing cyanide removing process during coking wastewater treatment.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a cyanogen removing agent which comprises activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O and polyacrylamide.
Further, it also comprises CaCl2And kaolin.
Further, the activated carbon comprises the following components in percentage by mass: 5% -20% of FeSO4·7H2O: 10% -20%, polymeric ferric sulfate: 20% -40%, polyaluminium chloride: 5% -20%, SnCl4：5％-10％，CuSO4·5H2O：5％-10％，Co(NO3)2·6H2O: 5% -10% and polyacrylamide: 5% -10% of CaCl2: 3% -10% and kaolin: 3 to 10 percent.
Further, the activated carbon comprises the following components in percentage by mass: 15% of FeSO4·7H2O: 12%, polymeric ferric sulfate: 30%, polyaluminum chloride: 12% of SnCl4：6％，CuSO4·5H2O：5％，Co(NO3)2·6H2O: 7%, polyacrylamide: 5% of CaCl2: 3% and kaolin: 5 percent.
Furthermore, the mesh number of the active carbon is 200 meshes and 300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent.
Furthermore, the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%.
Furthermore, the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2And mixing the O and the polyacrylamide, and stirring until the O and the polyacrylamide are uniformly mixed to prepare the cyanogen removing agent.
Further, the stirring speed is 2000-3000r/min, and the stirring time is 10-15 min.
The invention also provides an application of the cyanogen removing agent, wherein the cyanogen removing agent is used for treating the coking wastewater; the method specifically comprises the following steps: mixing a cyanogen removing agent and water according to the mass ratio of 1 (3-4) to prepare a cyanogen removing agent aqueous solution, adding the cyanogen removing agent aqueous solution into biochemical raw water subjected to biochemical treatment at the temperature of 20-35 ℃, stirring for 5-20min, standing and settling for 5-20min to obtain a supernatant; wherein the cyanogen removing agent is added at a concentration of 125-500 ppm.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a cyanogen removing agent, which adopts FeSO4·7H2O and polyferric sulfate as main components of the decyanation agent, FeSO4·7H2O and polyferric sulfate have better flocculation effect in water; cyanide in coking wastewater is mainly in the form of inorganic cyanideIn the presence of inorganic cyanides belonging to the class of weak bases, the inorganic cyanides and heavy metal ions of heavy metal salts have a very strong complexing power by using heavy metal salts such as SnCl4、CuSO4·5H2O and Co (NO)3)2·6H2O, the complexing effect of inorganic cyanide in the coking wastewater is realized, and a strong complex compound is formed; the flocculation speed of the coking wastewater is improved and the settling time is effectively shortened by the synergistic effect of the polyaluminium chloride and the polyacrylamide; the active carbon is adopted to realize effective adsorption of organic matters such as pigment in the coking wastewater, and after the active carbon is compounded with the ferric salt and the heavy metal salt, the adsorption of cyanide which is not subjected to complexation is realized, and the cyanogen removal effect is enhanced; compared with the conventional cyanogen removing agent, the cyanogen removing agent has the advantages of cheap raw materials, wide acquisition route, small dosage, quick response, high settling speed and the like.
Further, by adding CaCl2And kaolin, which has the functions of adjusting pH, removing a small amount of fluoride and accelerating sedimentation speed.
The invention also provides a preparation method of the cyanogen removing agent, which does not need complex preparation means and use methods, only needs to prepare raw materials into water mixed liquid with certain concentration for use, and has stable performance; the raw materials used by the cyanogen removing agent can be purchased directly, are cheap and have wide acquisition ways, and have considerable application prospect.
The invention also provides an application of the cyanogen removing agent in the treatment of the coking wastewater, the purpose of removing cyanogen can be realized by mixing the cyanogen removing agent with water, adding the mixture into biochemical raw water after biochemical treatment, stirring and standing, the cyanogen removing effect is obvious, and the feeding amount is less than that of the conventional cyanogen removing agent; when the total cyanide content of the coking wastewater is 3-6mg/L, the total cyanide content of the wastewater supernatant is less than or equal to 0.2mg/L after the treatment of the cyanogen removing agent, which is lower than the national allowable discharge standard, and the total cyanide content can play a role in decoloring.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
The invention provides a cyanogen removing agent which comprises the following components in percentage by mass: 5% -20% of FeSO4·7H2O: 10% -20%, polymeric ferric sulfate: 20% -40%, polyaluminium chloride: 5% -20% of SnCl4：5％-10％、CuSO4·5H2O：5％-10％、Co(NO3)2·6H2O: 5% -10%, polyacrylamide: 5% -10% of CaCl2: 3% -10% and kaolin: 3% -10%; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O, polyacrylamide, CaCl2And kaolin, which is mixed according to the proportion of the components and then stirred at room temperature until the mixture is uniformly mixed, wherein the stirring speed is 2000-3000r/min, and the stirring time is 10-15min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in the coking wastewater treatment, and specifically, the cyanogen removing agent and water are mixed according to the mass ratio of 1 (3-4) to prepare an aqueous solution of the cyanogen removing agent; adding the aqueous solution of the cyanogen removing agent into biochemical raw water after biochemical treatment, stirring for 5-20min at 20-35 ℃, standing for 5-20min to obtain supernatant, and removing the cyanide of the coking wastewater; wherein the cyanogen removing agent is added at a concentration of 125-500 ppm.
Example 1
The cyanogen removing agent disclosed by the embodiment 1 comprises the following components in percentage by mass: 15% of FeSO4·7H2O: 12%, polymeric ferric sulfate: 30%, polyaluminum chloride: 12% SnCl4：6％、CuSO4·5H2O：5％、Co(NO3)2·6H2O: 7%, polyacrylamide: 5% of CaCl2: 3% and kaolin: 5 percent; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O, polyacrylamide, CaCl2And kaolin, which are mixed according to the proportion of the components, and are stirred to be uniformly mixed at room temperature, wherein the stirring speed is 2000r/min, and the stirring time is 10min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in coking wastewater treatment, and specifically comprises the steps of mixing the cyanogen removing agent with water according to the mass ratio of 1:3, and preparing an aqueous solution of the cyanogen removing agent; taking 100mL of biochemically treated biochemical raw water I, and adding 200mg of the aqueous solution of the cyanogen removing agent; stirring at 20 deg.C for 5min, and standing for 5min to obtain treated supernatant; the obtained supernatant is used for detecting total cyanide by a GB7486-87 isonicotinic acid-pyrazolone colorimetric method to obtain the concentration of the total cyanide in the supernatant after the biochemical raw water I and the cyanide removing agent are treated, and the concentration is shown in the following table 1.
Table 1 concentration of total cyanide in supernatant after biochemical raw water and cyanogen removing agent treatment in example 1
| Item | Total cyanide content (mg/L) |
| Biochemical raw water 1 | 3.4263 |
| The treated supernatant | 0.0903 |
| Cyanide removal rate/%) | 97.4 |
As shown in Table 1, before and after the cyanogen removing agent in example 1 is added, the cyanide content in the biochemical raw water I is obviously reduced, wherein the dosage of the cyanogen removing agent is 500ppm, stirring and standing sedimentation are only 5min, and the method has the advantages of quick effect, high sedimentation speed, time cost saving and the like, the cyanide content of the treated supernatant is 0.0903mg/L which is far lower than the national allowable discharge standard of 0.2mg/L, and the cyanide removal rate is high and reaches 97.4%.
Example 2
Embodiment 2 provides a cyanogen removing agent, comprising, by mass: 10% FeSO4·7H2O: 10% of polymeric ferric sulfate: 20%, polyaluminum chloride: 20% SnCl4：10％、CuSO4·5H2O：10％、Co(NO3)2·6H2O: 10% and polyacrylamide: 10 percent; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O and polyacrylamide, and the components are mixed according to the proportion, stirred at room temperature until the components are uniformly mixed, the stirring speed is 2500r/min, and the stirring time is 12min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in coking wastewater treatment, and specifically comprises the steps of mixing the cyanogen removing agent with water according to the mass ratio of 1:4 to prepare an aqueous solution of the cyanogen removing agent; adding 200mg of the aqueous solution of the cyanogen removing agent into 200mL of biochemically treated biochemical raw water II, stirring for 5min at the temperature of 30 ℃, and standing for 5min to obtain supernatant; the obtained supernatant is used for detecting total cyanide by a GB7486-87 isonicotinic acid-pyrazolone colorimetric method, so that the concentration of the total cyanide in the supernatant after the biochemical treatment of the biochemical raw water II and the cyanogen removing agent treatment is obtained, and is shown in the following table 2.
Table 2 concentration of total cyanide in supernatant after treatment of raw biochemical water ii and cyanide removing agent in example 2
| Item | Total cyanide content (mg/L) |
| Biochemical raw water 2 | 5.0385 |
| Supernatant after treatment | 0.1431 |
| Cyanide removal rate/%) | 97.2 |
As shown in Table 2, the content of cyanide in raw biochemical water is reduced obviously before and after the cyanogen removing agent is added, wherein the dosage of the cyanogen removing agent is 200ppm, stirring and standing sedimentation are carried out for 5min respectively, the content of cyanide in the treated supernatant is 0.1431mg/L and is lower than the national allowable discharge standard of 0.2mg/L, and the removal rate of cyanide reaches 97.2%.
Example 3
In example 3, there is provided a cyanogen removing agent comprising, by mass: 20% FeSO4·7H2O: 20%, polymeric ferric sulfate: 20%, polyaluminum chloride: 5% SnCl4：5％、CuSO4·5H2O：5％、Co(NO3)2·6H2O: 5%, polyacrylamide: 5% of CaCl2: 5% and kaolin: 10 percent; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O, polyacrylamide, CaCl2And kaolin, the components are mixed according to the proportion, stirred at room temperature until the components are uniformly mixed, the stirring speed is 2000r/min, and the stirring time is 15min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in coking wastewater treatment, and specifically comprises the steps of mixing the cyanogen removing agent with water according to the mass ratio of 1:3 to prepare an aqueous solution of the cyanogen removing agent; adding 125mg of the aqueous solution of the cyanogen removing agent into 250mL of biochemically treated biochemical raw water III, stirring for 10min at the temperature of 35 ℃, and standing for 10min to obtain supernatant; the obtained supernatant is used for detecting total cyanide by a GB7486-87 isonicotinic acid-pyrazolone colorimetric method to obtain the concentration of the total cyanide in the biochemically treated raw biochemical water III and the supernatant treated by the cyanide removing agent, which is shown in the following table 3.
Table 3 concentration of total cyanide in supernatant after coking wastewater one and cyanogen removing agent treatment in example 3
| Item | Total cyanide content (mg/L) |
| Biochemical raw water III | 3.3046 |
| Supernatant after treatment | 0.1271 |
| Cyanide removal rate/%) | 96.2 |
As shown in Table 3, after the cyanogen removing agent is added, the cyanide content of the supernatant of the biochemical raw water is obviously reduced, wherein the dosage of the cyanogen removing agent is 125ppm, the mixture is stirred and stood for settling for 10min respectively, the cyanide content of the supernatant after treatment is 0.1271mg/L which is lower than the national allowable discharge standard of 0.2mg/L, and the cyanide removal rate reaches 96.2%.
Example 4
In example 4, a cyanogen removal agent is provided, comprising, by mass: 10% FeSO4·7H2O: 10% of polymeric ferric sulfate: 40%, polyaluminum chloride: 7% SnCl4：5％、CuSO4·5H2O：5％、Co(NO3)2·6H2O: 5%, polyacrylamide: 5% of CaCl2: 10% and kaolin: 3 percent; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10Percent, ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O, polyacrylamide, CaCl2And kaolin, the components are mixed according to the proportion, and the mixture is stirred to be uniformly mixed at room temperature, the stirring speed is 3000r/min, and the stirring time is 15min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in coking wastewater treatment, and specifically comprises the steps of mixing the cyanogen removing agent with water according to the mass ratio of 1:3 to prepare an aqueous solution of the cyanogen removing agent; adding 250mg of the aqueous solution of the cyanogen removing agent into 250mL of biochemically treated biochemical raw water IV, stirring for 15min at the temperature of 30 ℃, and standing for 15min to obtain supernatant; the obtained supernatant is used for detecting total cyanide by a GB7486-87 isonicotinic acid-pyrazolone colorimetric method, so that the concentration of the total cyanide in the biochemically treated raw biochemical water IV and the supernatant after the cyanogen removing agent treatment is obtained, and is shown in the following table 4.
Table 4 concentration of total cyanide in supernatant after biochemical raw water four and cyanogen removing agent treatment in example 4
| Item | Total cyanide content (mg/L) |
| Biochemical raw water four | 5.5219 |
| Supernatant after treatment | 0.1620 |
| Cyanide removal rate/%) | 97.1 |
As shown in Table 4, the cyanide content of the supernatant of the biochemical raw water is obviously reduced before and after the cyanogen removing agent is added, wherein the dosage of the cyanogen removing agent is 250ppm, the mixture is stirred and stood for settling for 15min respectively, the cyanide content of the supernatant after treatment is 0.1620mg/L which is lower than the national allowable discharge standard of 0.2mg/L, and the cyanide removal rate reaches 97.1%.
Example 5
In example 5, a cyanogen removal agent is provided, comprising, by mass: 5% FeSO4·7H2O: 15%, polymeric ferric sulfate: 25%, polyaluminum chloride: 10% SnCl4：8％、CuSO4·5H2O：8％、Co(NO3)2·6H2O: 8%, polyacrylamide: 5% of CaCl2: 8% and kaolin: 8 percent; wherein the mesh number of the active carbon is 200-300 meshes, the iodine adsorption value of the active carbon is more than or equal to 800mg/g, the water content is less than or equal to 10 percent, and the ash content is less than or equal to 7 percent; the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the polymeric ferric sulfate is 20-22%; the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
The invention also provides a preparation method of the cyanogen removing agent, which comprises the steps of mixing the activated carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O, polyacrylamide, CaCl2And kaolin, the components are mixed according to the proportion, and the mixture is stirred to be uniformly mixed at the temperature of 30 ℃, the stirring speed is 3000r/min, and the stirring time is 10min, so that the cyanogen removing agent is prepared.
The invention also provides an application of the cyanogen removing agent in coking wastewater treatment, and specifically comprises the steps of mixing the cyanogen removing agent with water according to the mass ratio of 1:3 to prepare an aqueous solution of the cyanogen removing agent; adding 200mg of the aqueous solution of the cyanogen removing agent into 100mL of biochemically treated biochemical raw water V, stirring for 20min at the temperature of 20 ℃, and standing for 20min to obtain a supernatant; the obtained supernatant is used for detecting total cyanide by a GB7486-87 isonicotinic acid-pyrazolone colorimetric method to obtain the concentration of the total cyanide in the biochemical raw water five after biochemical treatment and the supernatant after cyanogen removing agent treatment, which is shown in the following table 5.
TABLE 5 concentration of total cyanide in the supernatant after treatment of raw biochemical water five and cyanide removing agent in example 5
| Item | Total cyanide content (mg/L) |
| Biochemical raw water five | 4.9426 |
| Supernatant after treatment | 0.1483 |
| Cyanide removal rate/%) | 97.0 |
As shown in Table 5, the cyanide content of the biochemical raw water is obviously reduced before and after the cyanogen removing agent is added, wherein the dosage of the cyanogen removing agent is 500ppm, stirring and standing sedimentation are respectively carried out for 20min, the cyanide content of the treated supernatant is 0.1483mg/L which is lower than the national allowable discharge standard of 0.2mg/L, and the cyanide removal rate reaches 97.0%.
The above description is only illustrative of the preferred embodiments of the present invention, and any structural changes, improvements, modifications, etc. made without departing from the principle of the present invention are deemed to be within the scope of the present invention.
Claims (10)
1. The cyanogen removing agent is characterized by comprising active carbon and FeSO4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2O and polyacrylamide.
2. The cyanogen removing agent of claim 1 further comprising CaCl2And kaolin.
3. The cyanogen removing agent according to claim 1, which comprises the following components in percentage by mass: 5% -20% of FeSO4·7H2O: 10% -20%, polymeric ferric sulfate: 20% -40%, polyaluminium chloride: 5% -20%, SnCl4：5％-10％，CuSO4·5H2O：5％-10％，Co(NO3)2·6H2O: 5% -10% and polyacrylamide: 5% -10% of CaCl2: 3% -10% and kaolin: 3 to 10 percent.
4. The cyanogen removing agent according to claim 2, which comprises, by mass: 15% of FeSO4·7H2O: 12%, polymeric ferric sulfate: 30%, polyaluminum chloride: 12% of SnCl4：6％，CuSO4·5H2O：5％，Co(NO3)2·6H2O: 7%, polyacrylamide: 5% of CaCl2: 3% and kaolin: 5 percent.
5. The cyanogen removing agent as claimed in claim 1, wherein the mesh number of the activated carbon is 200 meshes or more and 300 meshes or less, the iodine adsorption value of the activated carbon is 800mg/g or more, the water content is 10% or less, and the ash content is 7% or less.
6. The cyanogen removing agent according to claim 1, wherein the mesh number of the polymeric ferric sulfate is 80-100 meshes, and the mass percentage of the ferric sulfate in the polymeric ferric sulfate is 20-22%.
7. The cyanogen removing agent according to claim 1, wherein the mesh number of the polyaluminium chloride is 50-80 meshes, and Al in the polyaluminium chloride2O3The mass percentage of the component (B) is 27-28%.
8. The method for preparing the cyanogen removing agent according to any one of claims 1 to 7, wherein activated carbon and FeSO are added4·7H2O, polyferric sulfate, polyaluminium chloride and SnCl4、CuSO4·5H2O、Co(NO3)2·6H2And mixing the O and the polyacrylamide, and stirring until the O and the polyacrylamide are uniformly mixed to prepare the cyanogen removing agent.
9. The method as claimed in claim 8, wherein the stirring speed is 2000-3000r/min for 10-15 min.
10. The use of a cyanogen-removing agent according to any of claims 1 to 7 wherein the cyanogen-removing agent is used for the treatment of a coking wastewater; the method specifically comprises the following steps: mixing a cyanogen removing agent and water according to the mass ratio of 1 (3-4) to prepare a cyanogen removing agent aqueous solution, adding the cyanogen removing agent aqueous solution into biochemical raw water subjected to biochemical treatment at the temperature of 20-35 ℃, stirring for 5-20min, standing and settling for 5-20min to obtain a supernatant; wherein the cyanogen removing agent is added at a concentration of 125-500 ppm.
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| CN112093878A (en) * | 2020-08-25 | 2020-12-18 | 湖北海汇化工科技有限公司 | Cyanogen removing agent and preparation method thereof |
| CN113087037A (en) * | 2021-04-06 | 2021-07-09 | 神美科技有限公司 | Cyanogen removing agent and preparation method thereof |
| CN113772779A (en) * | 2021-09-18 | 2021-12-10 | 鞍钢栗田(鞍山)水处理有限公司 | Medicament for realizing reduction of low-concentration cyanide-containing coking wastewater sludge and preparation method thereof |
| CN113788568A (en) * | 2021-10-14 | 2021-12-14 | 上海宝汇环境科技有限公司 | Coking wastewater advanced treatment and coupling fluoride ion removal process |
| CN115057507A (en) * | 2021-08-18 | 2022-09-16 | 翰蓝环保科技(上海)有限公司 | Wastewater purification treatment agent and preparation method thereof |
| CN115180736A (en) * | 2022-06-30 | 2022-10-14 | 上海宝汇环境科技有限公司 | Coking wastewater decyanation agent and coking wastewater treatment method |
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