CN113003892A - Coking wastewater treatment system and treatment process - Google Patents
Coking wastewater treatment system and treatment process Download PDFInfo
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- CN113003892A CN113003892A CN202110320276.8A CN202110320276A CN113003892A CN 113003892 A CN113003892 A CN 113003892A CN 202110320276 A CN202110320276 A CN 202110320276A CN 113003892 A CN113003892 A CN 113003892A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46145—Fluid flow
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention discloses a coking wastewater treatment system and a treatment process; the coking wastewater treatment system comprises a biochemical treatment device and an electrocatalytic oxidation device; the water outlet end of the biochemical treatment device is connected with the water inlet end of the electrocatalytic oxidation device; the biochemical treatment device is used for biochemical reaction of the coking wastewater, and the electrocatalytic oxidation device is used for electrocatalytic oxidation reaction of the coking wastewater; the coking wastewater treatment process at least comprises a biochemical treatment step and an electrocatalytic oxidation step. The scheme can solve the problems of low overall removal rate aiming at high-concentration COD and secondary products generated in the treatment process in the existing coking wastewater treatment process, and achieves the purposes of reducing energy consumption and running cost.
Description
Technical Field
The invention relates to the technical field of coking wastewater treatment, in particular to a coking wastewater treatment system and a coking wastewater treatment process.
Background
Coking wastewater is typical high-concentration refractory organic wastewater generated in the processes of high-temperature dry distillation, coal gas purification and chemical product refining of coal, mainly comprises residual ammonia water, crude benzene separation water, chemical product refining separation water, crude benzene final cooling wastewater, ammonia washing water, steam condensate water for ammonia distillation and the like, and pollutants of the coking wastewater mainly comprise inorganic substances in the form of ammonia salt, organic substances mainly comprising phenolic compounds, heterocyclic compounds, polycyclic organic substances and the like.
The existing coking wastewater advanced treatment technology mainly comprises a biochemical method and a physicochemical method, wherein the biochemical method mainly comprises two types, namely an aeration biological filter (BAF) and a Membrane Bioreactor (MBR), the physicochemical method mainly comprises coagulation, adsorption, membrane separation, microwave treatment, micro-electrolysis, electric flocculation and advanced oxidation technologies, and the advanced oxidation technologies comprise Fenton oxidation, electrocatalytic oxidation, photocatalytic oxidation, ultrasonic treatment and ozone oxidation; although the current coking wastewater treatment technologies are more, the current coking wastewater treatment technologies can not meet increasingly strict treatment index requirements only by independent operation of a single technology, so that a plurality of combined processes are derived in the current industry.
However, the traditional combined process of 'advanced oxidation + biochemistry' is low in overall removal rate of high-concentration COD (the overall removal rate of COD is lower than 80%), and the main reason is that the salt content in the wastewater treated by the traditional advanced oxidation technology is still high, the wastewater has a strong inhibition effect on the activity of microorganism bacteria in a subsequent biochemical reaction section, and the low biodegradability causes the hydraulic retention time of the biochemical section to be tens of hours or even hundreds of hours, so that the occupied area is large; meanwhile, the traditional advanced oxidation technology has high treatment energy consumption, and the treatment process is often accompanied by the generation of toxic and harmful secondary products, for example, the combined technology of the Fenton technology and other technologies has the defects of more types of added medicaments, large labor capacity, generation of a large amount of iron mud and the like; the MBR + ozone catalytic oxidation combined process has the advantages of high investment, high power consumption and selectivity of single ozone oxidation to pollutants.
Disclosure of Invention
The invention discloses a coking wastewater treatment system and a treatment process, which aim to solve the problems of low overall removal rate of high-concentration COD and generation of secondary products in the treatment process in the conventional coking wastewater treatment process and achieve the aims of reducing energy consumption and operation cost.
In order to solve the problems, the invention adopts the following technical scheme:
in a first aspect, the invention provides a coking wastewater treatment system, which comprises a biochemical treatment device and an electrocatalytic oxidation device; the water outlet end of the biochemical treatment device is connected with the water inlet end of the electrocatalytic oxidation device; the biochemical treatment device is used for biochemical reaction of the coking wastewater, and the electrocatalytic oxidation device is used for electrocatalytic oxidation reaction of the coking wastewater.
Optionally, the coking wastewater treatment system further comprises a magnetic coagulation sedimentation device, the water inlet end of the magnetic coagulation sedimentation device is connected with the water outlet end of the biochemical treatment device, and the water outlet end of the magnetic coagulation sedimentation device is connected with the water inlet end of the electrocatalytic oxidation device.
Optionally, a precise filtering device is further arranged between the magnetic coagulation sedimentation device and the electrocatalytic oxidation device, and the water outlet end of the magnetic coagulation sedimentation device is connected with the water inlet end of the electrocatalytic oxidation device through the precise filtering device.
Optionally, the electrocatalytic oxidation device is connected with a tail gas treatment device, and the tail gas treatment device is used for collecting and treating tail gas generated in the wastewater treatment process of the electrocatalytic oxidation device.
Optionally, the electrocatalytic oxidation device comprises a water inlet main pipe, a water outlet main pipe and at least two electrolysis baths; the at least two electrolysis baths are arranged between the water inlet main pipe and the water outlet main pipe in parallel, the water inlet main pipe is connected with the water outlet main pipe through the electrolysis baths, and the water inlet main pipe is connected with the water outlet end of the magnetic coagulation sedimentation treatment device.
Optionally, the electrolytic cell is extended along the transverse direction, and the anode connection terminal and the cathode connection terminal of the electrolytic cell are respectively arranged at two opposite ends of the electrolytic cell in the transverse direction.
Optionally, the electrolytic cells are arranged in an array in rows and columns respectively; the water inlet end of each electrolytic cell is respectively connected with the water inlet main pipe, and the water outlet end of each electrolytic cell is respectively connected with the water outlet main pipe.
Optionally, the water inlet main pipe is provided with water inlet branch pipes corresponding to the columns or rows of the electrolytic cell array arrangement, and the water outlet main pipe is provided with water outlet branch pipes corresponding to the columns or rows of the electrolytic cell array arrangement; each water inlet branch pipe is respectively connected with the water inlet ends of the electrolytic cells in the corresponding row or column, and each water outlet branch pipe is respectively connected with the water outlet ends of the electrolytic cells in the corresponding row or column.
Optionally, the electrolytic cell comprises a first sealing head, a second sealing head and a cylinder body with a hollow tubular structure; the first seal head and the second seal head are respectively arranged at two end ports of the cylinder body, and a sealed cavity is formed inside the cylinder body; the first seal head is provided with the anode wiring terminal, the second seal head is provided with the cathode wiring terminal, an anode electrode plate and a cathode electrolytic plate which are respectively connected with the anode wiring terminal and the cathode wiring terminal are arranged in the sealed cavity, and the side wall of the barrel is provided with a water inlet end and a water outlet end which are communicated with the sealed cavity.
In a second aspect, based on the above coking wastewater treatment system, the invention further provides a coking wastewater treatment process, which at least comprises the following steps:
biochemical treatment: conveying the coking wastewater to be treated to a biochemical treatment device for biochemical reaction treatment;
electrocatalytic oxidation step: and conveying the coking wastewater after the biochemical reaction treatment to an electrocatalytic oxidation device for electrocatalytic oxidation reaction treatment.
The technical scheme adopted by the invention can achieve the following beneficial effects:
according to the coking wastewater treatment system and the treatment process disclosed by the invention, the coking wastewater is pretreated by the biochemical treatment device, so that the COD (chemical oxygen demand) in the coking wastewater can be effectively reduced; then, the coking wastewater pretreated by the biochemical treatment device is conveyed to an electrocatalytic oxidation device for electrocatalytic oxidation reaction, so that the organic matters in the coking wastewater undergo oxidation-reduction reaction to remove the content of COD again; moreover, ions generated by ionization of salt contained in the coking wastewater can be utilized in the electrocatalytic oxidation process, so that the conductivity of the wastewater is ensured, the electrocatalytic oxidation treatment effect can be improved, and the energy consumption in the electrocatalytic oxidation treatment process is reduced; meanwhile, no additional medicament is required to be added in the whole treatment process, and no toxic and harmful secondary product is generated, so that secondary pollution to the environment can be prevented; therefore, compared with the traditional coking wastewater treatment process and the advanced oxidation combined process, the method has higher pollutant removal rate, can achieve the aims of reducing energy consumption and operation cost, and has the advantages of salt resistance and no secondary product.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a coking wastewater treatment system disclosed in example 1 of the present invention;
FIG. 2 is a schematic view showing the structure of an electrocatalytic oxidation apparatus disclosed in example 2 of the present invention;
FIG. 3 is a side view of the assembly of the first head with the corresponding flange portion of the electrolytic cell disclosed in example 2 of the present invention;
description of reference numerals:
100-electrolytic tank, 110-cylinder, 111-flange part, 112-water inlet control valve, 113-water outlet control valve, 120-first seal head, 121-anode connecting terminal, 130-fastener,
200-water inlet main pipe, 210-water inlet branch pipe, 300-water outlet main pipe, 310-water outlet branch pipe, 320-bypass pipe, 321-bypass control valve, 400-electric control cabinet, 410-anode copper bar and 420-cathode copper bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions disclosed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an embodiment of the present invention discloses a coking wastewater treatment system, which includes a biochemical treatment device, a magnetic coagulation sedimentation treatment device, and an electrocatalytic oxidation device; the water outlet end of the biochemical treatment device is connected with the water inlet end of the magnetic coagulation sedimentation treatment device, and the water outlet end of the magnetic coagulation sedimentation treatment device is connected with the water inlet end of the electrocatalytic oxidation device.
Wherein, the coking wastewater is pretreated by a biochemical treatment device, so that the COD in the coking wastewater can be effectively reduced; then, the coking wastewater pretreated by the biochemical treatment device is conveyed to an electrocatalytic oxidation device for electrocatalytic oxidation reaction, so that the organic matters in the coking wastewater undergo oxidation-reduction reaction to remove the content of COD again; moreover, ions generated by ionization of salt contained in the coking wastewater can be utilized in the electrocatalytic oxidation process, so that the conductivity of the wastewater is ensured, the electrocatalytic oxidation treatment effect can be improved, and the reduction of the energy consumption in the electrocatalytic oxidation treatment process is facilitated.
Meanwhile, no additional medicament is required to be added in the whole treatment process, and no toxic and harmful secondary product is generated, so that secondary pollution to the environment can be prevented; and moreover, the inhibition effect of stronger activity of the microorganism bacteria in the subsequent biochemical reaction section due to high salt content in the wastewater treated by the traditional advanced oxidation technology is avoided, so that the microorganism bacteria in the biochemical treatment stage in the embodiment keep good activity, the treatment effect of the biochemical treatment stage is ensured, the problem of longer hydraulic retention time of the biochemical section due to longer activity is avoided, and the occupied area is further reduced.
Therefore, compared with the traditional coking wastewater treatment process and the advanced oxidation combined process, the method has the advantages of higher pollutant removal rate, capability of achieving the purposes of reducing energy consumption and operation cost, salt tolerance, no secondary product and small occupied area.
Therefore, compared with the traditional advanced oxidation combination process, the method has higher pollutant removal rate, so that the COD removal rate can be improved to more than 80%, the ammonia nitrogen removal rate can reach 99%, and the total nitrogen removal rate can reach more than 50%.
Preferably, as shown in fig. 1, the coking wastewater treatment system disclosed by the present invention may further include a magnetic coagulation sedimentation device, and a water inlet end of the magnetic coagulation sedimentation device is connected to a water outlet end of the biochemical treatment device, and a water outlet end of the magnetic coagulation sedimentation device is connected to a water inlet end of the electrocatalytic oxidation device; thereby through the magnetism kind that magnetic coagulation sedimentation device added, be favorable to the organic granule of non-dissolving state and colloid cluster in the coking waste water to make precipitation efficiency improve, the content of COD, total cyanide, total suspended solid is reduced in the progress, and compare traditional coagulating sedimentation technology have area littleer, the treatment effeciency is higher, the advantage of equipment investment more province.
And simultaneously, the magnetism coagulating sedimentation device with still be provided with the secondary filter device between the electrocatalytic oxidation device, just the play water end warp of magnetism coagulating sedimentation device the secondary filter device with the end connection of intaking of electrocatalytic oxidation device, promptly the play water end of magnetism coagulating sedimentation processing apparatus with the end connection of intaking of secondary filter device, the play water end of secondary filter device with the end connection of intaking of electrocatalytic oxidation device to can filter the slight suspended impurity granule that gets rid of in the coking wastewater through the secondary filter device, with the requirement of intaking of guaranteeing follow-up electrocatalytic unit.
Meanwhile, a primary treatment device can be arranged at the front end of the biochemical treatment device to remove impurities such as stones, gravels, fats, grease and the like contained in the coking wastewater through mechanical treatment (such as grating, sedimentation or air flotation); then, the coking wastewater treated by the primary treatment equipment is conveyed to a biochemical treatment device for biochemical treatment, namely the biochemical treatment is used as secondary treatment.
In-process that coking wastewater carries to the electrocatalytic oxidation device and carries out the electrocatalytic oxidation reaction owing to can produce tail gas, so in order to avoid the environmental pollution that the direct emission of tail gas caused, can with the exhaust end and the tail gas processing apparatus of electrocatalytic oxidation device are connected, thereby pass through tail gas processing apparatus can collect the processing produced tail gas in the electrocatalytic oxidation device working process, and then reach the purpose of environmental protection.
It should be noted that, the precise filtering apparatus belongs to the existing filtering device, which is also called as a safety filter, and the filtering element made of PP melt-blown, wire-fired, folded, titanium filter element, activated carbon filter element, etc. is arranged in the casing, and different filtering elements are selected according to different filtering media and design processes to meet the requirement of effluent quality, and the structure of the precise filtering apparatus is not described in detail in this embodiment.
Example 2
Based on the coking wastewater treatment system in the example 1; correspondingly, the embodiment of the invention discloses a coking wastewater treatment process; wherein, taking the coking wastewater of a certain steel plant as an example, the COD concentration is about 3000mg/L, and the ammonia nitrogen concentration of the distilled ammonia effluent is about 200 mg/L; the specific treatment steps are as follows:
firstly, conveying the coking wastewater to a biochemical treatment device for biochemical reaction to remove COD, so that the concentration of the COD in the coking wastewater to be treated is reduced to about 500 mg/L; then, the coking wastewater after biochemical treatment is conveyed to a magnetic coagulation sedimentation device, and the contents of COD, total cyanide and total suspended matters are further reduced by the magnetic coagulation sedimentation device; then, introducing the treated coking wastewater to be treated into a precise filtering unit, and filtering fine suspended impurity particles to ensure the water inlet requirement of a subsequent electro-catalytic unit; finally, the filtered coking wastewater to be treated enters an electrocatalytic oxidation device for catalytic oxidation reaction, and the COD content can be reduced to be within 80mg/L in the process, so that the effluent is discharged after reaching the standard; meanwhile, tail gas generated in the electrocatalysis process is introduced into a tail gas treatment device for collection and treatment so as to ensure that no harmful gas is discharged.
Compared with the traditional coking wastewater treatment process and the advanced oxidation combined process, the coking wastewater treatment system and the treatment process disclosed by the embodiment of the invention have higher pollutant removal rate, can improve the COD removal rate to more than 80%, can improve the ammonia nitrogen removal rate to 99%, and can improve the total nitrogen removal rate to more than 50%.
Example 3
Referring to fig. 2 and 3, an embodiment of the invention discloses an electrocatalytic oxidation apparatus, which is suitable for the coking wastewater treatment system and the coking wastewater treatment process in the above embodiment of the invention.
The electrocatalytic oxidation device disclosed by the invention comprises at least two electrolytic tanks 100 which are arranged between a water inlet main pipe 200 and a water outlet main pipe 300 in parallel, wherein the water inlet main pipe 200 is connected with the water outlet main pipe 300 through the electrolytic tanks 100, namely, the water inlet end of each electrolytic tank 100 is respectively connected with the water inlet main pipe 200, and the water outlet end of each electrolytic tank 100 is respectively connected with the water outlet main pipe 300; meanwhile, the water inlet main pipe 200 is used for connecting the water outlet end of the magnetic coagulation sedimentation device, so that the coking wastewater treated by the magnetic coagulation sedimentation device can be shunted to each electrolytic tank 100 through the water inlet main pipe 200; the main effluent pipe 300 can be used for collecting and discharging effluent after being treated by each electrolytic cell 100.
The existing electrocatalytic oxidation equipment is mostly a square electrolytic cell, so that the problems of difficult installation, difficult maintenance and repair caused by high concentration and large volume and weight exist, and the problem of high operation and maintenance risks also exist due to high integrated power of a single matched power supply equipment.
The electrocatalytic oxidation device disclosed by the embodiment of the invention can lead the wastewater to be treated to be shunted to each electrolytic cell 100 through the water inlet main pipe 200 by the at least two electrolytic cells 100 which are arranged in parallel between the water inlet main pipe 200 and the water outlet main pipe 300, and carry out electrocatalytic oxidation reaction in each electrolytic cell 100 to remove COD, thereby effectively improving the removal effect of the COD in the wastewater compared with the structure of the prior square electrolytic cell 100 for centralized treatment of the wastewater.
Meanwhile, the electrolytic cells 100 arranged in parallel form a unitized structure, so that the number of the cells can be increased or decreased according to different water quality and water quantity requirements, not only can the complex pipeline design be avoided, but also each unitized single device has the advantages of small volume and light weight, and the purposes of convenient installation, maintenance and repair and reduction of operation and maintenance risks are achieved.
Specifically, as shown in fig. 2, the number of the electrolytic cells 100 may be 9, and the cells are arranged in an array of "3X 3 (i.e., 3 rows and 3 columns)" in an arrangement of rows and columns; meanwhile, the water inlet end of each electrolytic cell 100 is respectively connected with the water inlet main pipe 200, and the water outlet end of each electrolytic cell 100 is respectively connected with the water outlet main pipe 300, so that the distribution rule of the electrolytic cells 100 is ensured by the array arrangement mode of each electrolytic cell 100, the installation, the overhaul and the maintenance of each electrolytic cell 100 are facilitated, the arrangement space can be effectively utilized, and the utilization rate of the arrangement space is improved.
Accordingly, the water inlet main pipe 200 may be provided with the water inlet branch pipes 210 corresponding to the number of columns or rows of the array arrangement of the electrolytic cells 100, and the water outlet main pipe 300 is provided with the water outlet branch pipes 310 corresponding to the number of columns or rows of the array arrangement of the electrolytic cells 100; each water inlet branch pipe 210 is respectively connected with the water inlet end of each electrolytic cell 100 in the corresponding row or column, and each water outlet branch pipe 310 is respectively connected with the water outlet end of each electrolytic cell 100 in the corresponding row or column; therefore, compared with the mode that the water inlet end of each electrolytic cell 100 is directly connected with the water inlet main pipe 200 and the water outlet end of each electrolytic cell is directly connected with the water outlet main pipe 300, the pipe can be effectively saved, the complexity of pipeline design can be reduced, the arrangement and design of the pipeline are simple and clear, and the installation, the overhaul and the maintenance of workers are more convenient.
In order to control the water flow on/off and the flow rate of the water inlet end and the water outlet end of the electrolytic cell 100 respectively, as shown in fig. 2, a water inlet control valve 112 is usually arranged at the water inlet end of the electrolytic cell 100, and a water outlet control valve 113 is arranged at the water outlet end of the electrolytic cell 100, so that the flow rate and the on/off control of the water inlet end of the electrolytic cell 100 are realized through the water inlet control valve 112, and the flow rate and the on/off control of the water outlet end of the electrolytic cell 100 are realized through the water outlet control valve 113; in addition, when one of the electrolysis baths 100 is overhauled and maintained, the water inlet control valve 112 and the water outlet control valve 113 corresponding to the electrolysis bath 100 can be closed, so that the overhauling and maintaining operations of the electrolysis bath 100 are facilitated, and the normal operation of other electrolysis baths 100 can be ensured, so that the problem that the whole electrocatalytic oxidation device stops operating due to the overhauling and maintenance of the individual electrolysis baths 100 is avoided.
Preferably, as shown in fig. 2, each water outlet branch pipe 310 is provided with a corresponding bypass pipe 320, one end of each bypass pipe 320 is connected with the corresponding water outlet branch pipe 310, the other end of each bypass pipe 320 is connected with the main water outlet pipe 300, and each bypass pipe 320 is provided with a bypass control valve 321; accordingly, a corresponding control valve is provided at each of the outlet branch pipes 310, and the control valves are respectively located at one ends of the corresponding outlet branch pipes 310 connected to the outlet main pipe 300, so that, during a rinsing cleaning operation, the outlet branch pipes 310 can be closed by the control valves, the inlet branch pipes 210 can be closed by the inlet control valves 112, and the cleaning solution can be delivered to the corresponding electrolytic bath 100 through the respective bypass pipes 320 via the outlet main pipe 300 for rinsing cleaning.
In the electrocatalytic oxidation apparatus disclosed in the embodiment of the present invention, as shown in fig. 2, the electrolytic cell 100 may be a tubular electrolytic cell; generally, it comprises a first head 120, a second head and a cylinder 110 of hollow tubular structure; the first seal head 120 and the second seal head are respectively arranged at two end ports of the cylinder body 110, and a sealed cavity is formed inside the cylinder body 110; the first seal head 120 is provided with an anode connecting terminal 121, the second seal head is provided with a cathode connecting terminal, an anode electrode plate and a cathode electrolytic plate which are respectively connected with the anode connecting terminal 121 and the cathode connecting terminal are arranged in the sealed cavity, and the side wall of the cylinder body 110 is provided with a water inlet end and a water outlet end which are communicated with the sealed cavity.
In the wastewater treatment process, wastewater to be treated can be shunted to the water inlet end of each cylinder 110 through the water inlet main pipe 200 and enter the sealed cavity inside the cylinder 110; meanwhile, the power supply system is respectively connected with the anode connecting terminal 121 and the cathode connecting terminal, so that an anode electrode plate and a cathode electrolytic plate arranged in the sealed cavity generate an electric field, wastewater in the sealed cavity is subjected to electrocatalytic oxidation reaction under the action of the electric fields of the anode electrode plate and the cathode electrolytic plate to remove COD, and then flows out of the sealed cavity through the water outlet end arranged on the cylinder 110 to enter the water outlet main pipe.
Wherein the first end socket 120 is provided with an anode connecting terminal 121, and the second end socket is provided with a cathode connecting terminal; compared with a structure that the anode connecting terminal 121 and the cathode connecting terminal are arranged on the first sealing head 120 or the second sealing head at the same time, the connection interference between the anode connecting terminal 121 and the cathode connecting terminal can be avoided, and the maintenance of the electrolytic cell is facilitated.
The power supply system can be an electric control cabinet 400 as shown in fig. 2, an anode copper bar 410 of the electric control cabinet 400 is respectively connected with the anode wiring terminal 121 of each electrolytic cell 100, and a cathode copper bar 420 of the electric control cabinet 400 is respectively connected with the cathode wiring terminal, so that the electric control of the electrocatalytic oxidation equipment is facilitated through the electric control cabinet 400; meanwhile, the first sealing head 120 and the second sealing head can be detachably connected with the ports at the two ends of the cylinder 110, so that the electrolytic cell 100 can be conveniently disassembled and maintained.
As a specific detachable connection manner, two end ports of the cylinder 110 may be respectively set as flange portions 111, and the first sealing head 120 and the second sealing head are respectively fastened and connected to the flange portions 111 of the corresponding end ports by fasteners 130 such as bolts or screws.
Preferably, the opening of the flange portion 111 is provided as a stepped opening, and the shoulder surface of the stepped opening is provided with a mounting hole adapted to a bolt or a screw, as shown in fig. 3, so that the first sealing head 120 and the second sealing head are respectively lapped on the shoulder surface of the stepped opening of the corresponding flange portion 111 and are fastened and connected by the bolt or the screw; moreover, as shown in fig. 2, the height of the side surface of the stepped opening is greater than the height of the anode connection terminal 121 and the cathode connection terminal, so that the anode connection terminal 121 and the cathode connection terminal are prevented from being protruded out of the flange portion 111, and the anode connection terminal 121 and the cathode connection terminal are located in the groove where the shoulder surface of the stepped opening is located, thereby playing a certain protection role.
Meanwhile, as shown in fig. 2, each of the above-mentioned electrolytic cells 100 may be extended along the transverse direction, so that the anode connection terminal 121 and the cathode connection terminal of the electrolytic cell 100 are respectively disposed at two opposite ends of the electrolytic cell 100 in the transverse direction, that is, the anode connection terminal 121 and the cathode connection terminal of the electrolytic cell 100 are located at the side of the electrolytic cell 100, which is more convenient for the worker to perform the maintenance and operation on the electrolytic cell 100.
Because the electrocatalytic oxidation equipment can generate gas in the process of treating wastewater, the water outlet end of the electrolytic cell 100 is arranged at the top side of the electrolytic cell 100, that is, the water outlet end arranged on the cylinder 110 shown in fig. 2 is arranged on the side wall at the top side of the cylinder 110, so that the gas generated in the electrocatalytic oxidation process of the wastewater entering the sealed cavity can be smoothly discharged through the water outlet end at the side wall at the top side, and the normal operation of the electrolytic cell 100 is prevented from being influenced by the accumulation of the generated gas in the sealed cavity.
In addition, the number of the electrolytic cells 100 provided in the present embodiment can be adjusted to be increased or decreased adaptively according to actual use conditions; for example, the number of the electrolytic cells 100 to be provided may be 4, arranged in an array of "2X 2"; or the number of the electrolytic cells 100 can be 15, and the electrolytic cells are arranged in an array manner of '5X 3'; the number of the electrolytic cells 100 provided is not limited in the embodiment of the present invention.
In the above embodiments of the present invention, the difference between the embodiments is mainly described, and different optimization features between the embodiments can be combined to form a better embodiment as long as they are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A coking wastewater treatment system is characterized by comprising a biochemical treatment device and an electrocatalytic oxidation device; the water outlet end of the biochemical treatment device is connected with the water inlet end of the electrocatalytic oxidation device; the biochemical treatment device is used for biochemical reaction of the coking wastewater, and the electrocatalytic oxidation device is used for electrocatalytic oxidation reaction of the coking wastewater.
2. The coking wastewater treatment system of claim 1, further comprising a magnetic coagulation sedimentation device, wherein the water inlet end of the magnetic coagulation sedimentation device is connected with the water outlet end of the biochemical treatment device, and the water outlet end of the magnetic coagulation sedimentation device is connected with the water inlet end of the electrocatalytic oxidation device.
3. The coking wastewater treatment system according to claim 2, characterized in that a precise filtering device is further arranged between the magnetic coagulation sedimentation device and the electrocatalytic oxidation device, and the water outlet end of the magnetic coagulation sedimentation device is connected with the water inlet end of the electrocatalytic oxidation device through the precise filtering device.
4. The coking wastewater treatment system of claim 3, wherein the electrocatalytic oxidation device is connected with a tail gas treatment device, and the tail gas treatment device is used for collecting and treating tail gas generated in the wastewater treatment process of the electrocatalytic oxidation device.
5. The coking wastewater treatment system of any one of claims 1 to 4, wherein the electrocatalytic oxidation device includes a water inlet header, a water outlet header, and at least two electrolysis cells; the at least two electrolysis baths are arranged between the water inlet main pipe and the water outlet main pipe in parallel, the water inlet main pipe is connected with the water outlet main pipe through the electrolysis baths, and the water inlet main pipe is connected with the water outlet end of the magnetic coagulation sedimentation treatment device.
6. The coking wastewater treatment system of claim 5, wherein the electrolytic cell is disposed to extend in the transverse direction, and the anode connection terminal and the cathode connection terminal of the electrolytic cell are respectively disposed at opposite ends of the electrolytic cell in the transverse direction.
7. The electrocatalytic oxidation apparatus as set forth in claim 5, wherein said cells are arranged in an array in rows and columns, respectively; the water inlet end of each electrolytic cell is respectively connected with the water inlet main pipe, and the water outlet end of each electrolytic cell is respectively connected with the water outlet main pipe.
8. The electrocatalytic oxidation apparatus as set forth in claim 7, wherein said water inlet main pipe is provided with water inlet branch pipes corresponding to the number of columns or rows of said electrolytic cell array arrangement, and said water outlet main pipe is provided with water outlet branch pipes corresponding to the number of columns or rows of said electrolytic cell array arrangement; each water inlet branch pipe is respectively connected with the water inlet ends of the electrolytic cells in the corresponding row or column, and each water outlet branch pipe is respectively connected with the water outlet ends of the electrolytic cells in the corresponding row or column.
9. The coking wastewater treatment system of claim 5, wherein the electrolyzer comprises a first head, a second head and a cylinder of hollow tubular structure; the first seal head and the second seal head are respectively arranged at two end ports of the cylinder body, and a sealed cavity is formed inside the cylinder body; the first seal head is provided with the anode wiring terminal, the second seal head is provided with the cathode wiring terminal, an anode electrode plate and a cathode electrolytic plate which are respectively connected with the anode wiring terminal and the cathode wiring terminal are arranged in the sealed cavity, and the side wall of the barrel is provided with a water inlet end and a water outlet end which are communicated with the sealed cavity.
10. A coking wastewater treatment process is characterized by at least comprising the following steps:
biochemical treatment: conveying the coking wastewater to be treated to a biochemical treatment device for biochemical reaction treatment;
electrocatalytic oxidation step: and conveying the coking wastewater after the biochemical reaction treatment to an electrocatalytic oxidation device for electrocatalytic oxidation reaction treatment.
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Application publication date: 20210622 |