CN112777812A - Nitrile-containing wastewater pretreatment device and pretreatment process - Google Patents
Nitrile-containing wastewater pretreatment device and pretreatment process Download PDFInfo
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- CN112777812A CN112777812A CN202011497944.6A CN202011497944A CN112777812A CN 112777812 A CN112777812 A CN 112777812A CN 202011497944 A CN202011497944 A CN 202011497944A CN 112777812 A CN112777812 A CN 112777812A
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- containing wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 68
- 150000002825 nitriles Chemical class 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000004062 sedimentation Methods 0.000 claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000005345 coagulation Methods 0.000 claims abstract description 10
- 230000015271 coagulation Effects 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 229910002804 graphite Inorganic materials 0.000 claims description 24
- 239000010439 graphite Substances 0.000 claims description 24
- 229910001220 stainless steel Inorganic materials 0.000 claims description 24
- 239000010935 stainless steel Substances 0.000 claims description 24
- 239000003054 catalyst Substances 0.000 claims description 22
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 15
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 15
- 238000005868 electrolysis reaction Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005189 flocculation Methods 0.000 claims description 5
- 230000016615 flocculation Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 6
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Images
Classifications
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- 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
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)
- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a pretreatment device and a pretreatment process for nitrile-containing wastewater, wherein the device comprises a regulating tank, at least one electrolytic tank, a sedimentation tank and an intermediate water tank; the regulating tank, the electrolytic tank, the sedimentation tank and the middle water tank are connected in sequence; a liquid level meter, a pH meter and a pH adjusting device are arranged in the adjusting tank; the regulating tank is connected with the bottom of the electrolytic tank through a lift pump; the upper part of the electrolytic cell is connected with the sedimentation tank, and a slice pH adjusting device and a dosing coagulation device are arranged between the electrolytic cell and the sedimentation tank; the upper part of the sedimentation tank is connected with the middle water tank, and the middle water tank is provided with a liquid level meter and a lifting pump. The nitrile-containing wastewater pretreatment device is efficient and stable, and the treatment cost is greatly reduced by the nitrile-containing wastewater pretreatment process.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a pretreatment device and a pretreatment process for nitrile-containing wastewater.
Background
The nitrile-containing wastewater treatment is a difficult point and a key point for treating and controlling pollution in the petrochemical industry, pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like in the wastewater have high concentration and are mostly oligomers, the biodegradability of the wastewater is poor, and in addition, the existence of cyanide in the wastewater is also an important factor influencing the biochemical treatment effect of the wastewater. Therefore, the effective pretreatment process of the nitrile-containing wastewater is an important factor for ensuring the wastewater treatment to reach the standard.
The conventional cyanogen breaking adopts a sodium hypochlorite oxidation method, hypochlorite is added under an alkaline condition, active chlorine in the hypochlorite is utilized to oxidize the cyanide into cyanate, then the hypochlorite is added under a near-neutral condition, and the cyanate is further oxidized into nitrogen and carbonic acid.
There is a need for a low-cost, efficient and stable pretreatment device and pretreatment process for nitrile-containing wastewater to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a nitrile-containing wastewater pretreatment device and a pretreatment process.
The invention solves the technical problems by the following technical scheme:
the invention provides a nitrile-containing wastewater pretreatment device, which comprises a regulating tank, at least one electrolytic tank, a sedimentation tank and an intermediate water tank, wherein the regulating tank is connected with the at least one electrolytic tank; the regulating tank, the electrolytic tank, the sedimentation tank and the middle water tank are connected in sequence; a liquid level meter, a pH meter and a pH adjusting device are arranged in the adjusting tank; the regulating tank is connected with the bottom of the electrolytic tank through a lifting pump; the electrolytic cell comprises a working area and a water inlet area, the water inlet area is positioned below the electrolytic cell, the water inlet area is separated from the working area through a pore plate, the working area is provided with a graphite anode plate and a stainless steel cathode plate, the graphite anode plate and the stainless steel cathode plate form electrodes, the distance between the graphite anode plate and the stainless steel cathode plate is 60-90 cm, a catalyst is arranged between the graphite anode plate and the stainless steel cathode plate, circulating pumps are connected above and below the electrolytic cell, and the electrolytic cell is connected with a sodium hypochlorite doser; the upper part of the electrolytic cell is connected with the sedimentation tank, and a slice pH adjusting device and a dosing coagulation device are arranged between the electrolytic cell and the sedimentation tank; the top of sedimentation tank with middle pond links to each other, middle pond is provided with level gauge and elevator pump.
In the invention, the regulating tank is used for realizing the pH regulation of the nitrile-containing wastewater before the nitrile-containing wastewater enters the electrolytic tank;
preferably, the pH adjusting device comprises an alkali adding device and a pH adjusting stirring device.
In the invention, the electrolytic cell is one of the main components of the pretreatment device for the nitrile-containing wastewater, and the majority of the nitrile-containing wastewater is treated by electrolysis;
preferably, the number of the electrolytic cells is 2, and 2 electrolytic cells are connected in series;
preferably, the water inlet area is provided with a water distribution pipe, so that the waste water is conveniently and uniformly distributed at the bottom of the electrolytic cell.
In the invention, the sedimentation tank is used for realizing sludge-water separation, and the structure of the sedimentation tank is conventional in the field.
In the invention, the intermediate water tank is used for containing the pretreated wastewater and is connected with a subsequent treatment device, and the structure of the intermediate water tank is conventional in the field.
In the invention, the graphite anode plate and the stainless steel cathode plate form electrodes, and are matched with a catalyst for degrading cyanide;
preferably, the distance between the graphite anode plate and the stainless steel cathode plate is 80 cm.
In the invention, the catalyst is used for degrading harmful substances in the wastewater;
preferably, the filling rate of the catalyst between the graphite anode plate and the stainless steel cathode plate is 50%;
preferably, the catalyst is a carbon-based catalyst with rare metals attached.
In the present invention, the level meter, the lift pump, the circulation pump and the pH meter are all conventional in the art.
In the invention, the dosing coagulation device is used for dosing drugs to realize flocculation reaction.
In the invention, the sodium hypochlorite doser is used for adding sodium hypochlorite.
The invention also provides a nitrile-containing wastewater pretreatment process which is carried out by adopting the nitrile-containing wastewater pretreatment device and comprises the following steps:
s1, after the wastewater enters the regulating tank, feeding back according to a pH meter signal, preliminarily regulating the pH of the wastewater to 8-10 by using the pH regulating device, feeding back by using the lift pump according to a liquid level meter signal, starting the lift pump at a high liquid level, and stopping the lift pump at a low liquid level;
s2, after the lift pump is started, the power supply of the electrolytic cell is started, the wastewater enters the electrolytic cell for electrolysis, and the circulating pump is started when the power supply is started to uniformly mix the wastewater and the catalyst, so that the wastewater is fully contacted with the catalyst; electrolyzing waste water in an electrolytic cell, adding sodium hypochlorite into a sodium hypochlorite doser, wherein the pulse direct current voltage between a graphite cathode plate and a stainless steel anode plate is 30-40V, and the current density is 35-55 mA/cm2The electrolysis time is 15-30 min;
s3, adjusting the effluent of the electrolytic cell to 8-8.5 by a pH adjusting device, adding PAC and PAM into a dosing coagulation device for flocculation reaction, and then feeding the effluent into a sedimentation tank for mud-water separation;
and S4, feeding the separated supernatant into an intermediate water tank, and pumping the wastewater to other treatment processes by a lifting pump.
In the present invention, preferably, in S1, after the initial adjustment, the pH of the system is 8.5 to 9.5.
In the present invention, preferably, in S2, the pulse DC voltage between the graphite cathode plate and the stainless steel anode plate is 35V, and the current density is 45mA/cm2The electrolysis time was 25min.
The invention has the advantages and beneficial effects that: the nitrile-containing wastewater pretreatment device is efficient and stable, and the treatment cost is greatly reduced by the nitrile-containing wastewater pretreatment process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a nitrile-containing wastewater pretreatment device according to an embodiment of the present invention.
Description of reference numerals:
1. a regulating tank;
2. a pH meter;
3. a liquid level meter;
4. a pH adjusting device;
5. a lift pump;
6. an electrolytic cell;
7. a stainless steel cathode plate;
8. a graphite anode plate;
9. a sodium hypochlorite doser;
10. a catalyst;
11. a circulation pump;
12. a dosing coagulation device;
13. a sedimentation tank;
14. and a middle water tank.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in fig. 1, the present embodiment provides a pretreatment device for nitrile-containing wastewater, comprising a regulating reservoir 1, an electrolytic cell 6, a sedimentation tank 13 and an intermediate water reservoir 14; the regulating tank 1, the electrolytic tank 6, the sedimentation tank 13 and the middle water tank 14 are connected in sequence; a liquid level meter 3, a pH meter 2 and a pH adjusting device 4 are arranged in the adjusting tank 1; the bottom parts of the regulating tank 1 and the electrolytic tank 6 are connected through a lift pump 5; the electrolytic cell 6 comprises a working area and a water inlet area, the water inlet area is positioned below the electrolytic cell 6, the water inlet area and the working area are separated by a pore plate, the working area is provided with a graphite anode plate 8 and a stainless steel cathode plate 7, the graphite anode plate 8 and the stainless steel cathode plate 7 form electrodes, the distance between the graphite anode plate 8 and the stainless steel cathode plate 7 is 80cm, a catalyst 10 is arranged between the graphite anode plate 8 and the stainless steel cathode plate 7, circulating pumps 11 are connected above and below the electrolytic cell 6, and the electrolytic cell 6 is connected with a sodium hypochlorite doser 9; the upper part of the electrolytic cell 6 is connected with a sedimentation tank 13, and a slice pH adjusting device 4 and a dosing coagulation device 12 are arranged between the electrolytic cell 6 and the sedimentation tank 13; the upper part of the sedimentation tank 13 is connected with an intermediate water tank 14, and the intermediate water tank 14 is provided with a liquid level meter 3 and a lifting pump 5.
In this example, the filling ratio of the catalyst 10 was 50%, and the catalyst was a carbon-based catalyst to which cobalt was attached.
In the embodiment, the adjusting tank 1 is used for adjusting the pH value of the nitrile-containing wastewater before the nitrile-containing wastewater enters the electrolytic tank 6; the pH adjusting device 4 comprises an alkali adding device and a pH adjusting and stirring device.
In this embodiment, the electrolytic cell 6 is one of the main components of the pretreatment apparatus for nitrile-containing wastewater in this embodiment, and treats most of the nitrile-containing wastewater by electrolysis.
In this embodiment, the sedimentation tank 13 is used for separating sludge and water.
In this embodiment, the intermediate tank 14 is used for holding the pretreated wastewater and is connected to a subsequent treatment device.
In this embodiment, the graphite anode plate 8 and the stainless steel cathode plate 7 form electrodes, and are used for degrading cyanide in cooperation with the catalyst 10.
In this embodiment, the dosing coagulation device 12 is used for dosing drugs to achieve flocculation reaction.
In this embodiment, the sodium hypochlorite feeder 9 is used for feeding sodium hypochlorite.
The embodiment also provides a nitrile-containing wastewater pretreatment process, which is implemented by adopting the nitrile-containing wastewater pretreatment device and comprises the following steps:
s1, after the wastewater enters the adjusting tank 1, feeding back according to a signal of the pH meter 2, preliminarily adjusting the pH of the wastewater to 8-10 by the pH adjusting device 4, feeding back by the lift pump 5 according to a signal of the liquid level meter 3, starting the lift pump 5 at a high liquid level, and stopping the lift pump 5 at a low liquid level;
s2, after the lift pump 5 is started, the power supply of the electrolytic cell 6 is started, the wastewater enters the electrolytic cell 6 for electrolysis, the circulating pump 11 is started when the power supply is started, the wastewater and the catalyst 10 are uniformly mixed, and the wastewater and the catalyst 10 are fully contacted; electrolyzing wastewater by an electrolytic cell 6, adding sodium hypochlorite by a sodium hypochlorite doser 9, wherein the pulse direct current voltage between a graphite cathode plate and a stainless steel anode plate is 35V, and the current density is 455mA/cm2The electrolysis time is 25 min;
s3, adjusting the effluent of the electrolytic cell 6 to 8-8.5 by the pH adjusting device 4, adding PAC (polyaluminium chloride) and PAM (polyacrylamide) into the coagulation device 12 for flocculation reaction, and then feeding the effluent into the sedimentation tank 13 for mud-water separation;
and S4, feeding the separated supernatant into an intermediate water tank 14, and pumping the wastewater to other treatment processes through a lifting pump 5.
The initial concentration of COD measured by the method of this example and the initial concentration of COD measured by the conventional alkaline chlorination method for the same water quality were measured, and the data are shown in the following Table 1:
table 1 treatment effect data of example 1 method and conventional method
The data comparison shows that the nitrile-containing wastewater pretreatment device is efficient and stable, and the nitrile-containing wastewater pretreatment process greatly reduces the treatment cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The pretreatment device for the nitrile-containing wastewater is characterized by comprising a regulating tank, at least one electrolytic tank, a sedimentation tank and an intermediate water tank; the regulating tank, the electrolytic tank, the sedimentation tank and the middle water tank are connected in sequence; a liquid level meter, a pH meter and a pH adjusting device are arranged in the adjusting tank; the regulating tank is connected with the bottom of the electrolytic tank through a lifting pump; the electrolytic cell comprises a working area and a water inlet area, the water inlet area is positioned below the electrolytic cell, the water inlet area is separated from the working area through a pore plate, the working area is provided with a graphite anode plate and a stainless steel cathode plate, the graphite anode plate and the stainless steel cathode plate form electrodes, the distance between the graphite anode plate and the stainless steel cathode plate is 60-90 cm, a catalyst is arranged between the graphite anode plate and the stainless steel cathode plate, circulating pumps are connected above and below the electrolytic cell, and the electrolytic cell is connected with a sodium hypochlorite doser; the upper part of the electrolytic cell is connected with the sedimentation tank, and a slice pH adjusting device and a dosing coagulation device are arranged between the electrolytic cell and the sedimentation tank; the top of sedimentation tank with middle pond links to each other, middle pond is provided with level gauge and elevator pump.
2. The pretreatment apparatus for nitrile-containing wastewater according to claim 1, wherein said pH adjusting means comprises an alkali adding means and a pH adjusting stirring means.
3. The pretreatment apparatus for nitrile-containing wastewater as set forth in claim 1, wherein the number of said electrolytic cells is 2, and 2 of said electrolytic cells are connected in series.
4. The pretreatment device for nitrile-containing wastewater as recited in claim 1, wherein said water inlet region is provided with a water distribution pipe.
5. The pretreatment device for nitrile-containing wastewater according to claim 1, wherein the distance between the graphite anode plate and the stainless steel cathode plate is 80 cm.
6. The pretreatment device for nitrile-containing wastewater as claimed in claim 1, wherein the catalyst has a filling rate of 50% between the graphite anode plate and the stainless steel cathode plate.
7. The pretreatment device for nitrile-containing wastewater as recited in claim 1, wherein said catalyst is a carbon-based catalyst to which rare metals are attached.
8. A pretreatment process of nitrile-containing wastewater, which is carried out by adopting the pretreatment device of nitrile-containing wastewater as claimed in any one of claims 1 to 7, and comprises the following steps:
s1, after the wastewater enters the regulating tank, feeding back according to a pH meter signal, preliminarily regulating the pH of the wastewater to 8-10 by using the pH regulating device, feeding back by using the lift pump according to a liquid level meter signal, starting the lift pump at a high liquid level, and stopping the lift pump at a low liquid level;
s2, after the lift pump is started, the power supply of the electrolytic cell is started, the wastewater enters the electrolytic cell for electrolysis, and the circulating pump is started when the power supply is started to uniformly mix the wastewater and the catalyst, so that the wastewater is fully contacted with the catalyst; electrolyzing waste water in an electrolytic cell, adding sodium hypochlorite into a sodium hypochlorite doser, wherein the pulse direct current voltage between a graphite cathode plate and a stainless steel anode plate is 30-40V, and the current density is 35-55 mA/cm2The electrolysis time is 15-30 min;
s3, adjusting the effluent of the electrolytic cell to 8-8.5 by a pH adjusting device, adding PAC and PAM into a dosing coagulation device for flocculation reaction, and then feeding the effluent into a sedimentation tank for mud-water separation;
and S4, feeding the separated supernatant into an intermediate water tank, and pumping the wastewater to other treatment processes by a lifting pump.
9. The pretreatment process of nitrile-containing wastewater as claimed in claim 8, wherein in S1, after the initial adjustment, the pH of the system is 8.5-9.5.
10. The pretreatment process for nitrile-containing wastewater as claimed in claim 8, wherein in S2, the pulse DC voltage between the graphite cathode plate and the stainless steel anode plate is 35V, and the current density is 45mA/cm2The electrolysis time was 25min.
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| CN202011497944.6A CN112777812A (en) | 2020-12-17 | 2020-12-17 | Nitrile-containing wastewater pretreatment device and pretreatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011497944.6A CN112777812A (en) | 2020-12-17 | 2020-12-17 | Nitrile-containing wastewater pretreatment device and pretreatment process |
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| CN112777812A true CN112777812A (en) | 2021-05-11 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202988886U (en) * | 2013-01-05 | 2013-06-12 | 浙江永峰环保工程科技有限公司 | Cyanide-containing wastewater treatment system |
| CN104129875A (en) * | 2014-08-16 | 2014-11-05 | 长春黄金研究院 | Cyanated wastewater treatment method |
| CN205603423U (en) * | 2016-05-04 | 2016-09-28 | 衢州峥嵘环保科技有限公司 | Cyanide wastewater multilevel processing device |
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- 2020-12-17 CN CN202011497944.6A patent/CN112777812A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202988886U (en) * | 2013-01-05 | 2013-06-12 | 浙江永峰环保工程科技有限公司 | Cyanide-containing wastewater treatment system |
| CN104129875A (en) * | 2014-08-16 | 2014-11-05 | 长春黄金研究院 | Cyanated wastewater treatment method |
| CN205603423U (en) * | 2016-05-04 | 2016-09-28 | 衢州峥嵘环保科技有限公司 | Cyanide wastewater multilevel processing device |
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