CN112520894A - Method and device for treating mixed wastewater containing cyanogen, nickel and total phosphorus - Google Patents
Method and device for treating mixed wastewater containing cyanogen, nickel and total phosphorus 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
- C02F9/00—Multistage 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
- C02F1/52—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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- 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
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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Abstract
The invention discloses a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus, which comprises the following steps: collecting wastewater containing cyanogen, nickel and total phosphorus into a mixed wastewater adjusting tank, then sending the wastewater into a first-stage reaction tank, adding an oxidant on line, sending the mixed wastewater after reaction into a second-stage reaction tank, adding NaOH, adjusting the pH value of the wastewater under stirring, then adding PAC and PAM for mixing, sending the mixed wastewater after reaction into a sedimentation tank, sending one part of the separated mixed wastewater to be reused, sending the other part of the separated mixed wastewater into a comprehensive adjusting tank, combining and then discharging. The method plays an important role in improving the standard-reaching reliability, reducing the treatment cost and reducing the pollution to the water body.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method and a device for treating mixed wastewater containing cyanogen, nickel and total phosphorus.
Background
The sewage treatment industry in China has been rapidly developed for forty years, but the advantages of the sewage treatment industry are still lagged behind the needs of urban development. On one hand, the water is seriously deficient, and on the other hand, a large amount of sewage is discharged and flows into polluted water bodies of rivers, lakes and seas. With the development of economy, the sewage treatment technology in China develops own technology while absorbing and digesting foreign technologies. The bubbling method introduced from abroad, the A2/O method, the oxidation ditch method, the AB method, the ABC and S B R methods, the biomembrane method, the high-pressure membrane method and the like appeared in recent years, but the technologies have the problems of higher construction cost and operation cost, waiting for improvement of treatment efficiency and the like to different degrees. The sewage equipment in China has the defects of low efficiency, high energy consumption, high maintenance rate, low automation degree and the like. At present, the existing sewage treatment equipment in China has the running conditions of 1/3 normal running, 1/3 abnormal running and 1/3 stopped state, and the whole treatment process technology is still to be improved.
Regarding the treatment process of wastewater containing cyanogen or nickel and total phosphorus, the prior method usually adopts a method for respectively treating, and the treatment method can also remove heavy metals and ensure that the wastewater can reach the discharge standard; but the process is relatively complex, the occupied area is large, the operation is troublesome, the construction cost is high, particularly in the actual operation, the nickel plating and gold plating (generating cyanide) processes are adjacent processes, and in the actual application, the water containing cyanide contains nickel, and the water containing nickel contains cyanide; after the independent test treatment, the cyanide in the cyanide-containing water reaches the standard, but the nickel possibly exceeds the standard, and the further treatment by adding the medicament is needed in order to reach the standard; after the single test treatment, the nickel in the nickel-containing water reaches the standard, but cyanide exceeds the standard, and similarly, the chemical agent is required to be added for further treatment in order to reach the standard. Meanwhile, the nickel-containing wastewater also contains a considerable amount of total phosphorus, wherein metaphosphate and nickel can form a stable complex, so that nickel and phosphorus are treated together, and the possibility of exceeding standards is caused by respective treatment, and the treatment is carried out by adding a medicament for reaching the standards. For the treatment method, the treatment effects are all uneven, the treatment effects are mutually influenced, the standard reaching is unstable, the problems are not completely solved, the standard reaching of the wastewater treatment is influenced, and the problem of the wastewater treatment is solved. Most importantly, the problems associated with the separate treatment of the wastewater can result in high wastewater treatment costs that are unacceptable to the industry. In order to solve the problem of stable standard reaching of wastewater containing cyanogen, nickel and total phosphorus, research on a novel process technology for stable standard reaching of the mixed wastewater is urgently needed. The method for treating the mixed wastewater is still a blank.
Disclosure of Invention
The technology of the invention provides a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to the defects of the original traditional separate treatment process, which does not need separate treatment, adds a proper amount of alkali to adjust the pH value, and mixes cyanogen, nickel and total phosphorus together for treatment, thereby thoroughly changing the original treatment process. The process adopts the on-line addition of a novel oxidant-hydroxyl free radical, breaks the complexation of heavy metal ions through the strong oxidability of the hydroxyl free radical, and then reaches the discharge standard through coagulating sedimentation.
The invention relates to a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus, which comprises the following steps:
(A) respectively collecting wastewater containing cyanogen, nickel and total phosphorus into a mixed wastewater adjusting tank, and carrying out centralized mixing to obtain mixed wastewater;
(B) sending the mixed wastewater into a primary reaction tank, adding an oxidant (adding at a constant speed by adopting a hydroxyl radical generator) on line, and carrying out oxidation reaction under stirring to break the complexation of heavy metal ions; the strong oxidizing property of hydroxyl free radicals is utilized to break the complex bonds of all the components, so that free substances are formed in the mixed wastewater;
(C) sending the mixed wastewater after reaction in the first-stage reaction tank into a second-stage reaction tank, adding NaOH, adjusting the pH value of the wastewater under stirring, and adding PAC and PAM for mixing to promote coagulation of reaction products;
(D) sending the mixed wastewater after the reaction in the secondary reaction tank into a sedimentation tank to ensure that the liquid-solid mixture is completely settledPrecipitating, separating, and removing CN-、Ni2+And total phosphorus;
(E) and (3) sending one part of the mixed wastewater separated from the sedimentation tank for reuse, sending the other part of the mixed wastewater into a comprehensive regulating tank, merging the mixed wastewater, and discharging the mixed wastewater after all the mixed wastewater reaches the national discharge standard.
The treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus, disclosed by the invention, comprises the step (B), wherein the oxidant is a hydroxyl radical, the adding amount of the hydroxyl radical is 10-25 g/t of wastewater, and the mixing and stirring time after the hydroxyl radical is added is 30-40 minutes.
The treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus, provided by the invention, comprises the step (C) of controlling the pH value to be more than or equal to 12.
The invention relates to a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus, wherein the concentration of PAC in the step (C) is 5%, and the addition amount of PAC is 20-50 g/t of wastewater.
The treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus, disclosed by the invention, is characterized in that the concentration of PAM is 5%, and the addition amount of PAM is 0.5-2.0 g/t of wastewater.
The treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus, provided by the invention, is characterized in that the mixing and stirring time in the step (C) is 15 minutes.
The device adopted by the method for treating the mixed wastewater containing cyanogen, nickel and total phosphorus comprises a mixed wastewater regulating tank, a primary reaction tank, a secondary reaction tank, a sedimentation tank and a comprehensive regulating tank which are sequentially connected, wherein the sedimentation tank is also connected with a recycling tank, the primary reaction tank is connected with a hydroxyl radical generator, and the secondary reaction tank is connected with a NaOH container, a PAC container and a PAM container.
The device comprises a primary reaction tank, a secondary reaction tank, a waste water mixing tank and an oxidant feeding port, wherein the primary reaction tank is provided with the inlet for mixing waste water and the oxidant feeding port; the secondary reaction tank is provided with a mixed wastewater inlet, a NaOH feeding port, a PAC feeding port and a PAM feeding port; an inlet for mixed wastewater is arranged on the sedimentation tank; the comprehensive adjusting tank is provided with an inlet for mixed wastewater and a wastewater discharge port, and the recycling tank is provided with an inlet for mixed wastewater.
In the device, stirrers are arranged in the primary reaction tank and the secondary reaction tank.
The invention relates to a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus, which is different from the prior art in that:
the invention relates to a method for treating mixed wastewater containing cyanogen, nickel and total phosphorus, which is carried out by adopting a mixed wastewater treatment device thereof, wherein the treatment method comprises CN-、Ni2+The treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus breaks through the original separate treatment method, adopts the online addition of hydroxyl free radicals in the mixed wastewater, breaks through the complexation of heavy metal ions through the strong oxidizing property of the hydroxyl free radicals, and then carries out coagulating sedimentation separation to realize the standard discharge of the total phosphorus, thereby being a new process technology for wastewater treatment.
The invention adopts a new method for treating the mixed wastewater containing cyanogen, nickel and total phosphorus, not only can treat various wastewater together, but also can stably discharge the wastewater up to the standard, and compared with the original method for respectively treating, the method has good results on the problems of treatment process, construction investment, treatment effect and treatment cost, and particularly greatly reduces the wastewater treatment cost; under the condition of the same wastewater treatment capacity, 3 kinds of wastewater are respectively treated, the cost required by standard discharge is different from 40-50 yuan/t of wastewater, after improvement, mixed wastewater treatment is carried out, the cost required by standard discharge is only about 5 yuan/t of wastewater, the cost is reduced remarkably, and the high praise and acceptance of customers are obtained. The adoption of the wastewater treatment process technology breaks through the original traditional treatment method, and the mixed wastewater treatment is a bolded attempt without precedent, thereby achieving the purpose of simultaneously removing cyanogen, nickel and total phosphorus, obviously improving the treatment effect, and obtaining ideal effects by various technical indexes, so to say, the method has been put forward in the industry. Particularly, the original national standard aiming at the nickel emission standard is 0.1mg/L, and all the current treatment technical methods cannot meet the index, so the emission standard is relaxed to 0.5 mg/L. However, the new process technology of the invention can reach the original national emission standard. The invention can achieve better treatment effect, and most importantly, the novel oxidant is adopted, so that a very key effect is played for the treatment of mixed wastewater, a novel process for treating various types of wastewater after being mixed can be realized, the treatment standard of heavy metal can be ensured, a difficult problem of wastewater treatment of related enterprises is solved, a novel process technology is provided for the wastewater treatment industry, and irreplaceable important effect can be played in the industry.
The method plays an important role in improving the standard-reaching reliability, reducing the treatment cost and reducing the pollution to water bodies in the wastewater treatment in the industry, and also has positive promotion effects on solving the difficult problems in the whole water treatment field, particularly the industrial wastewater treatment, reducing the investment, saving the energy, reducing the consumption and the like, and reaches the advanced level of the domestic and foreign wastewater treatment process technology.
The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to the present invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an adopted device of the treatment method of the mixed wastewater containing cyanogen, nickel and total phosphorus.
Detailed Description
Example 1
As shown in figure 1, the device for treating the mixed wastewater containing cyanogen, nickel and total phosphorus comprises a mixed wastewater adjusting tank 1, a primary reaction tank 2, a secondary reaction tank 3, a sedimentation tank 4 and a comprehensive adjusting tank 5 which are sequentially connected, wherein the sedimentation tank is also connected with a recycling tank 6, the primary reaction tank 2 is connected with a hydroxyl radical generator 7, and the secondary reaction tank 3 is connected with a NaOH container 8, a PAC container 9 and a PAM container 10.
A mixed wastewater inlet and an oxidant feeding port are arranged on the primary reaction tank 2; an inlet for mixed wastewater, a NaOH adding port, a PAC adding port and a PAM adding port are arranged on the secondary reaction tank 3; an inlet for mixed wastewater is arranged on the sedimentation tank 4; the comprehensive adjusting tank 5 is provided with a mixed wastewater inlet and a wastewater discharge outlet, and the recycling tank 6 is provided with a mixed wastewater inlet; stirrers 11 are arranged in the first-stage reaction tank 2 and the second-stage reaction tank 3.
Example 2
A treatment method of mixed wastewater containing cyanogen, nickel and total phosphorus adopts the device of embodiment 1 to treat, and specifically comprises the following steps:
(A) respectively collecting wastewater containing cyanogen, nickel and total phosphorus into a mixed wastewater adjusting tank 1, and carrying out centralized mixing to obtain mixed wastewater;
(B) sending the mixed wastewater into a primary reaction tank 2, adding an oxidant on line by adopting a hydroxyl radical generator 7, and carrying out oxidation reaction under stirring to break the complexation of heavy metal ions; the oxidant is hydroxyl free radical, the adding amount of the hydroxyl free radical is 10 g/t of wastewater, and the mixing and stirring time after the hydroxyl free radical is added is 30 minutes.
(C) Sending the mixed wastewater after reaction in the first-stage reaction tank 2 into a second-stage reaction tank 3, adding NaOH, adjusting the pH value of the wastewater to be more than or equal to 12 under stirring, and adding PAC and PAM for mixing to promote coagulation of reaction products; PAC concentration of 5%, addition of 20g/t wastewater, PAM concentration of 5%, addition of 0.5g/t wastewater, and mixing and stirring time of 15 minutes.
(D) Sending the mixed wastewater after the reaction in the second-stage reaction tank 3 into a sedimentation tank 4 to ensure that the liquid-solid mixture realizes complete sedimentation and separation and CN is removed-、Ni2+And total phosphorus;
(E) and (3) sending one part of the mixed wastewater separated from the sedimentation tank 4 to reuse, sending the other part of the mixed wastewater to the comprehensive regulating tank 5, merging, and discharging after all the mixed wastewater reaches the national discharge standard.
Example 3
The difference from example 2 is: in the step (B), the adding amount of the hydroxyl free radicals is 15g/t of wastewater, and the mixing and stirring time after the hydroxyl free radicals are added is 32 minutes; in the step (C), the addition amount of PAC is 30g/t of wastewater, and the addition amount of PAM is 1.0g/t of wastewater. The rest is the same as in example 2.
Example 4
The difference from example 2 is: in the step (B), the adding amount of the hydroxyl free radicals is 20g/t of wastewater, and the mixing and stirring time after the hydroxyl free radicals are added is 35 minutes; in the step (C), the addition amount of PAC is 40g/t of wastewater, and the addition amount of PAM is 1.5g/t of wastewater. The rest is the same as in example 2.
Example 5
The difference from example 2 is: in the step (B), the adding amount of the hydroxyl free radicals is 25g/t of wastewater, and the mixing and stirring time after the hydroxyl free radicals are added is 37 minutes; in the step (C), the addition amount of PAC is 40g/t of wastewater, and the addition amount of PAM is 1.7g/t of wastewater. The rest is the same as in example 2.
Example 6
The difference from example 2 is: in the step (B), the adding amount of the hydroxyl free radicals is 25g/t of wastewater, and the mixing and stirring time after the hydroxyl free radicals are added is 40 minutes; in the step (C), the addition amount of PAC is 50g/t of wastewater, and the addition amount of PAM is 2.0g/t of wastewater. The rest is the same as in example 2.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A treatment method of mixed wastewater containing cyanogen, nickel and total phosphorus is characterized in that: the method comprises the following steps:
(A) respectively collecting wastewater containing cyanogen, nickel and total phosphorus into a mixed wastewater adjusting tank, and carrying out centralized mixing to obtain mixed wastewater;
(B) sending the mixed wastewater into a primary reaction tank, adding an oxidant on line, and carrying out oxidation reaction under stirring to break the complexation of heavy metal ions;
(C) sending the mixed wastewater after reaction in the first-stage reaction tank into a second-stage reaction tank, adding NaOH, adjusting the pH value of the wastewater under stirring, and adding PAC and PAM for mixing to promote coagulation of reaction products;
(D) sending the mixed wastewater after the reaction in the secondary reaction tank into a sedimentation tank, so that the liquid-solid mixture is completely precipitated and separated, and removing CN-、Ni2+And total phosphorus;
(E) and (3) sending one part of the mixed wastewater separated from the sedimentation tank for reuse, sending the other part of the mixed wastewater into a comprehensive regulating tank, merging the mixed wastewater, and discharging the mixed wastewater after all the mixed wastewater reaches the national discharge standard.
2. The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to claim 1, wherein: in the step (B), the oxidant is hydroxyl free radicals, the adding amount of the hydroxyl free radicals is 10-25 g/t of wastewater, and the mixing and stirring time after the hydroxyl free radicals are added is 30-40 minutes.
3. The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to claim 2, wherein: in step (C), the pH is controlled to be 12 or more.
4. The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to claim 3, wherein: in the step (C), the concentration of PAC is 5%, and the addition amount is 20-50 g/t of wastewater.
5. The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to claim 4, wherein: the concentration of the PAM is 5%, and the addition amount of the PAM is 0.5-2.0 g/t of wastewater.
6. The method for treating mixed wastewater containing cyanogen, nickel and total phosphorus according to claim 5, wherein: the mixing and stirring time in the step (C) was 15 minutes.
7. The device adopted by the method for treating the mixed wastewater containing cyanogen, nickel and total phosphorus according to any one of claims 1 to 6 is characterized in that: including consecutive mixed waste water equalizing basin (1), one-level reaction pond (2), second grade reaction pond (3), sedimentation tank (4) and comprehensive equalizing basin (5), the sedimentation tank still links to each other with retrieval and utilization pond (6), one-level reaction pond (2) link to each other with hydroxyl radical generator (7), second grade reaction pond (3) link to each other with NaOH container (8), PAC container (9) and PAM container (10).
8. The apparatus of claim 7, wherein: an inlet for mixed wastewater and an oxidant feeding port are arranged on the primary reaction tank (2); an inlet for mixed wastewater, a NaOH adding port, a PAC adding port and a PAM adding port are arranged on the secondary reaction tank (3); an inlet for mixed wastewater is arranged on the sedimentation tank (4); an inlet and a waste water discharge port for mixing waste water are arranged on the comprehensive adjusting tank (5), and an inlet for mixing waste water is arranged on the recycling tank (6).
9. The apparatus of claim 7, wherein: stirrers (11) are arranged in the first-stage reaction tank (2) and the second-stage reaction tank (3).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107675A (en) * | 2021-11-29 | 2022-03-01 | 深圳中科欧泰华环保科技有限公司 | Novel method and device for recovering metal palladium |
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| CN105417787A (en) * | 2015-12-15 | 2016-03-23 | 深圳中科欧泰华环保科技有限公司 | Comprehensive electroplating wastewater treatment method |
| JP2016077989A (en) * | 2014-10-20 | 2016-05-16 | 東洋鋼鈑株式会社 | Method for treating solution containing nickel ions, hypophosphorous acid compound and phosphorous acid compound |
| CN206486383U (en) * | 2017-01-12 | 2017-09-12 | 深圳市世清环保科技有限公司 | Effectively reduce the processing system of chemical nickle-plating wastewater pollutant |
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- 2020-11-30 CN CN202011370750.XA patent/CN112520894A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016077989A (en) * | 2014-10-20 | 2016-05-16 | 東洋鋼鈑株式会社 | Method for treating solution containing nickel ions, hypophosphorous acid compound and phosphorous acid compound |
| CN105000711A (en) * | 2015-07-14 | 2015-10-28 | 深圳市绿沁环保科技有限公司 | Nickel-containing combined electroplating wastewater treatment device and method |
| CN105417787A (en) * | 2015-12-15 | 2016-03-23 | 深圳中科欧泰华环保科技有限公司 | Comprehensive electroplating wastewater treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114107675A (en) * | 2021-11-29 | 2022-03-01 | 深圳中科欧泰华环保科技有限公司 | Novel method and device for recovering metal palladium |
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