Synchronous wastewater treatment system based on chlorobenzonitrile synthesis process

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process, which comprises a treatment box internally provided with a plurality of partition plates, the partition plates divide the box body into multiple stages of reaction branch cavities connected in series, and the branch cavities are sequentially communicated through water delivery ports to form step-by-step oxidation channels. Each branch cavity is integrated with an electrolytic cyanide breaking and pH regulation and control module, each electrolytic module is formed by carrying a double-side electrolyzer on a support frame fixed on the cavity wall, and an anode region directly receives inlet water and synchronously electrolyzes and oxidizes cyanide radicals; an aeration pipeline is wound on the support frame, a middle support column is arranged at the front end of the support frame to carry the photocatalytic oxidation system, and the pH adjusting system realizes closed-loop regulation and control through an alkalization feeder and an auxiliary support frame and is aligned with the electrolysis system, so that an oxidation-mineralization-neutralization integrated treatment system is formed, and deep purification of wastewater and resource recovery are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and specifically to a synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process. Background Art

[0002] As a key intermediate in the synthesis of pesticides, pharmaceuticals, and dyes, the industrial production of chlorobenzonitrile mainly relies on the chlorination / cyanation reaction of benzoic acid or cyanobenzene compounds. However, the wastewater generated by this process contains high concentrations of cyanide, chlorinated aromatic hydrocarbons, and inorganic salts, and has the characteristics of strong toxicity, poor biodegradability, and complex composition.

[0003] For the wastewater treatment of the chlorobenzonitrile synthesis process, multi-stage purification technologies such as oxidative decomposition, activated carbon adsorption, and membrane separation are generally used. However, there are also certain technical bottlenecks. During the oxidation process, the degradation of cyanide is incomplete, and oxidants need to be repeatedly added, resulting in low utilization rate of oxidants and long hydraulic retention time, making it difficult to match the wastewater discharge characteristics of the continuous production of chlorobenzonitrile. Summary of the Invention

[0004] The purpose of the present invention is to provide a synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process, including a treatment tank. Inside the tank of the treatment tank, a number of partition plates are provided. The partition plates divide the inner cavity of the treatment tank into several reaction branch cavities. Water inlets are provided on the partition plates, and adjacent reaction branch cavities are sequentially connected through the water inlets. The reaction branch cavity at the input end is externally connected to an input pipe group, and the reaction branch cavity at the output end is externally connected to an output pipe group; an electrolytic cyanide-breaking system and a pH adjustment system are provided in each reaction branch cavity. The electrolytic cyanide-breaking system includes a support frame and an oxidation support frame. The support frame is fixedly installed on the cavity wall of the corresponding reaction branch cavity through a fixed substrate. On both sides of the inner frame of the support frame, electrolyzers are provided. The electrolyzers on both sides form an electrolytic area and are located at the output port position of the input pipe group; an aeration pipeline is wound around the frame of the support frame, and a middle support column is supported at the front end of the support frame. The oxidation support frame is arranged on the middle support column, and a photocatalytic oxidation system is provided on the oxidation support frame. The pipe body of the aeration pipeline is connected to the photocatalytic oxidation system; the pH adjustment system is arranged opposite to the electrolytic cyanide-breaking system. The pH adjustment system includes an alkalization feeder and an auxiliary support frame. The output end of the alkalization feeder is arranged inside the frame of the auxiliary support frame, and the auxiliary support frame is located in the reaction area of the photocatalytic oxidation system.

[0006] As a further solution of the present invention: The electrolyzer includes an electrolysis machine box and an electrolysis support. The electrolysis machine box is fixed on the frame of the support frame through a fixing seat. The electrolysis support is fixed along the inner edge of the frame of the support frame. The power supply wire of the electrolysis machine box passes through the inside of the frame of the support frame and is electrically connected to the electrolysis support. A number of electrolysis electrodes are provided on the electrolysis support, and electrode wires are installed on the electrolysis electrodes. The electrode wires are located at the output ports of the input pipe group.

[0007] As a further solution of the present invention: The main body of the oxidation support frame is the support frame main body. There are two support frame main bodies and they are installed on the upper and lower sides of the middle support bar. Reinforcing support feet are also provided at the corners of the support frame main body, and the reinforcing support feet are further supported and connected to the support frame; The aeration pipeline is wound and installed along the rear edge of the reinforcing support feet; As a further solution of the present invention: Two groups of photocatalytic oxidation systems are provided. Each group of photocatalytic oxidation systems is installed in a matching manner with the support frame main body. Each group of photocatalytic oxidation systems includes an oxygen supply branch pipe, an exhaust cylinder and a lighting bar. As a further solution of the present invention: The oxygen supply branch pipe is fixed inside the frame of the corresponding support frame main body. The pipe body of the oxygen supply branch pipe is communicated with the aeration pipeline. The exhaust cylinder is fixed at the output terminal of the oxygen supply branch pipe. A number of exhaust holes are arranged on the outer wall of the exhaust cylinder. As a further solution of the present invention: The lighting bar is fixed to the outer wall of the pipe body of the corresponding exhaust hole through a fixing bolt. Lighting rib strips are provided at the edges of the lighting bar frame body, and a number of spotlights are provided on the lighting rib strips; As a further solution of the present invention: A heating plate is further provided inside the lighting bar frame body, and a number of electric heaters are provided on the heating plate.

[0008] As a further solution of the present invention: The alkalization feeder includes a support sleeve, an auxiliary material adder mounted on the support sleeve, and an acid-base adjustment pipe mounted at the output end of the auxiliary material adder. A flow controller is installed between the output end of the auxiliary material adder and the acid-base adjustment pipe. The auxiliary support frame is installed at the terminal of the acid-base adjustment pipe. As a further solution of the present invention: The main body of the auxiliary support frame is the auxiliary material diffusion outer support frame. A diffuser is provided inside the frame of the auxiliary material diffusion outer support frame. A diffusion panel is provided on the diffuser. The pipe body of the acid-base adjustment pipe is connected to the diffuser; As a further solution of the present invention: An inner support bar is provided inside the inner frame of the auxiliary material diffusion outer support frame, and a pH detector is provided on the inner support bar.

[0009] Compared with the prior art, the beneficial effects of the present invention are: First, the multi-stage collaborative oxidation mechanism improves the treatment efficiency This system adopts a series-connected multi-reaction chamber structure. The wastewater flows through multiple treatment units in sequence, forming a gradually strengthened oxidation environment. The highly toxic cyanide radical is rapidly oxidized to less toxic CNO by the electrolyzer. - ; Meanwhile, the O 2 injected by the aeration pipeline reacts with the H 2 O 2 generated by electrolysis to form a Fenton system, accelerating the decomposition of organic matter and further mineralizing CNO - into CO 2 and N 2 . The multi-stage series connection enables the unreacted oxidant to be superimposed with the subsequent fresh electrolysis products, with a cyanide removal rate ≥ 99.5% and the total cyanide concentration in the effluent stably below 0.5 mg / L.

[0010] II. Synchronous pH Regulation to Achieve Closed-loop Optimization The pH adjustment system adds NaOH solution in real time through an alkalization feeder to neutralize the H + generated by electrolysis, maintaining the pH in the reaction zone at 8.5 - 9.5. The pH detector and the PLC control system form a closed loop, dynamically adjusting the dosage of the chemical agent with a control accuracy of ±0.1, avoiding equipment corrosion or reaction inhibition caused by local over-acidity or over-alkalinity.

[0011] III. Resource Recycling and Low-carbon Design The H 2 by-produced during the electrolysis process is recycled and reused for the reduction reaction in the synthesis process of chlorobenzonitrile after purification, realizing the resource utilization of by-products; the aeration system is directly connected to the process tail gas, reducing carbon emissions by 22%.

[0012] This system realizes the efficient, low-consumption and safe treatment of chlorobenzonitrile wastewater through the triple synergistic effects of electrolytic oxidation - photocatalysis - pH regulation, with multi-stage oxidation, intelligent regulation and resource recycling as the core. The system breaks through the technical bottleneck of the deep treatment of highly toxic cyanide, reduces the treatment cost by 30% and the carbon emission intensity by 25%, combining technical advancement and economic feasibility.

[0013] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0014] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with this application and used together with the specification to explain the principles of this application. At the same time, these drawings and the text description are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

[0015] Figure 1Schematic diagram of the overall structure of the synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process provided by the embodiments of the present invention.

[0016] Figure 2 Schematic diagram of the structure of the electrolytic cyanide-breaking system provided by the embodiments of the present invention.

[0017] Figure 3 For the present invention Figure 2 Schematic diagram of the structure of area A in the present invention.

[0018] Figure 4 Schematic diagram of the structure of the photocatalytic oxidation system provided by the embodiments of the present invention.

[0019] Figure 5 Schematic diagram of the structure of the pH adjustment system in the present invention.

[0020] In the figure: 1. Treatment tank; 11. Partition board; 12. Reaction branch cavity; 13. Input pipe group; 14. Output pipe group; 2. Electrolytic cyanide-breaking system; 21. Support frame; 22. Aeration pipeline; 23. Photocatalytic oxidation system; 24. Middle support column; 25. Electrolyzer; 26. Fixed substrate; 27. Oxidation support frame; 231. Oxygen supply branch pipe; 232. Exhaust cylinder; 233. Exhaust hole; 234. Lighting column; 235. Fixed bolt; 236. Lighting rib; 237. Spotlight; 238. Heating plate; 239. Electric heater; 251. Electrolysis machine box; 252. Fixed seat; 253. Electrode wire; 254. Electrolysis support; 255. Electrolysis electrode; 271. Strengthening support foot; 272. Support frame main body; 3. pH adjustment system; 31. Alkalization feeder; 32. Auxiliary support frame; 311. Support sleeve; 312. Auxiliary material adder; 313. Acid-base adjustment pipe; 314. Flow controller; 315. Diffuser; 316. Diffusion panel; 321. Auxiliary material diffusion outer support frame; 322. Inner support column; 323. pH detector. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0022] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] The following describes the specific implementation of the present invention in detail in conjunction with specific embodiments.

[0024] Example 1, please refer toFigure 1 and Figure 2 Figure 1 , a synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process is provided, including a treatment tank 1. A plurality of partition plates 11 are arranged in the tank body of the treatment tank 1. The partition plates 11 divide the inner cavity of the treatment tank 1 into a plurality of reaction branch cavities 12. Water inlets are arranged on the partition plates 11. Adjacent reaction branch cavities 12 are sequentially communicated through the water inlets. The reaction branch cavity 12 at the input end is externally connected with an input pipe group 13, and the reaction branch cavity 12 at the output end is externally connected with an output pipe group 14.

[0025] An electrolytic cyanide-breaking system 2 and a pH adjustment system 3 are arranged in each reaction branch cavity 12. The electrolytic cyanide-breaking system 2 includes a support frame 21 and an oxidation support frame 27. The support frame 21 is fixedly installed on the cavity wall of the corresponding reaction branch cavity 12 through a fixed substrate 26. Electrolyzers 25 are arranged on both sides of the inner frame of the support frame 21. The electrolyzers 25 on both sides form an electrolytic area and are located at the output port position of the input pipe group 13.

[0026] An aeration pipeline 22 is wound around the frame body of the support frame 21. A middle support column 24 is supported at the front end of the support frame 21. The oxidation support frame 27 is erected on the middle support column 24. A photocatalytic oxidation system 23 is arranged on the oxidation support frame 27. The pipe body of the aeration pipeline 22 is connected with the photocatalytic oxidation system 23; the pH adjustment system 3 is arranged opposite to the electrolytic cyanide-breaking system 2; the pH adjustment system 3 includes an alkalization feeder 31 and an auxiliary support frame 32. The output end of the alkalization feeder 31 is arranged inside the frame body of the auxiliary support frame 32 and the auxiliary support frame 32 is located in the reaction area of the photocatalytic oxidation system 23.

[0027] In this embodiment, the treatment tank 1 is a cuboid closed container, and its interior is evenly divided into 3-5 independent reaction branch cavities 12 by vertically arranged partition plates 11. Water inlets are opened at the bottom of the partition plates, so that a series connection channel is formed between the branch cavities. The first-end branch cavity is connected with the wastewater discharge port of the chlorobenzonitrile synthesis process through the input pipe group 13, and the last-end branch cavity is connected with a neutralization tank or a reuse system through the output pipe group 14.

[0028] Each reaction branch cavity 12 is provided with an "H"-shaped support frame 21, and an anode (made of RuO 2 -TiO 2 coated titanium plate) and a cathode (made of stainless steel plate) are embedded in the two side frames to form electrolyzers 25. The distance between the electrode plates is 10-15 cm, and the electrolytic area covers the area below the input pipe orifice. And a photocatalytic module is also arranged. The photocatalytic oxidation system 23 is installed on the middle support column 24 at the front section of the support frame, forming a synergistic oxidation area with the electrolytic area.

[0029] The support frame body winds around the microporous aeration pipeline 22, and compressed air is introduced through the bottom of the support cavity. The end of the pipeline is connected to the photocatalytic area to form a gas-liquid mixed oxidation environment. At the same time, a pH adjustment system 3 is also provided. The alkalization feeder 31 transports the alkaline solution (using NaOH solution) to the auxiliary support frame 32, and the dosing amount of the alkaline solution is adjusted in real time to maintain the pH in the reaction area at 8.5 - 9.5.

[0030] During the treatment process, each reaction support cavity 12 is connected in series in turn, thus forming a multi-stage electrolytic oxidation process. The wastewater enters the first-end support cavity through the input pipe group 13 and first contacts the strong oxidants such as ClO - , O 3 generated by the electrolyzer 25. The cyanide radical (CN - ) is oxidized to CNO - . At the same time, the O 2 injected by the aeration pipeline 22 reacts with the H 2 O 2 electrolyzed to form a Fenton system, which further decomposes organic matter.

[0031] The electrolyzed cyanide enters the photocatalytic oxidation system 23 with the water flow. Under the excitation of ultraviolet light, ·OH radicals are generated, and CNO - is mineralized into CO 2 and N 2 . This process reacts with the H + electrolyzed, and the pH adjustment system 3 is required to neutralize the acidic environment. When the wastewater flows through each support cavity in turn, the unreacted oxidants in the previous stage and the fresh electrolytic products in the subsequent stage form a superposition effect, gradually improving the treatment efficiency. A redundant electrolysis module is set in the end support cavity to ensure that the total cyanide concentration in the effluent < 0.5 mg / L.

[0032] The electrolytic oxidation and pH adjustment are completed synchronously in a single support cavity. Compared with the traditional batch treatment, the reaction time is shortened by 40%. The series-connected support cavity structure enables the wastewater to undergo 3 - 5 stages of treatment, and the cyanide removal rate ≥ 99.5%.

[0033] The H 2 electrolyzed can be used for the reduction reaction in the synthesis process of chlorobenzonitrile after purification, realizing the resource utilization of by-products. The aeration system uses the tail gas of the synthesis process, reducing carbon emissions by 22%. The overall space is designed in an intensive manner and is suitable for the compact layout of the chlorobenzonitrile production line. This system solves the problem of deep treatment of highly toxic cyanide in chlorobenzonitrile wastewater through the synergistic effect of electrolytic oxidation - photocatalysis - pH regulation, and has both technical and economic advantages.

[0034] Example 2, please refer to Figure 2 and Figure 3 . Based on the content described in the above example, for the specific implementation structure of the electrolyzer 25, the design of this example is as follows: The electrolyzer 25 includes an electrolysis machine box 251 and an electrolysis support 254. The electrolysis machine box 251 is fixed to the frame of the support frame 21 through a fixing seat 252. The electrolysis support 254 is fixed to the inner edge of the frame of the support frame 21. The power supply line of the electrolysis machine box 251 passes through the inside of the frame of the support frame 21 and is electrically connected to the electrolysis support 254. A plurality of electrolysis electrodes 255 are provided on the electrolysis support 254, and electrode wires 253 are installed on the electrolysis electrodes 255; the electrode wires 253 are located at the output port position of the input pipe group 13.

[0035] The electrolyzer 25 is composed of an electrolysis machine box 251 and an electrolysis support 254. The electrolysis machine box 251 is a 304 stainless steel sealed box body, which is vertically installed on the outside of the frame of the support frame 21 through bilateral fixing seats 252 (with locking bolts). The machine box is internally provided with an adjustable pulse power module, and the output current range is 0 - 30A, and the voltage is 0 - 24V.

[0036] The electrolysis support 254 is fixed to the inner edge of the support frame 21 by polytetrafluoroethylene insulating rods. Slots are provided on the support, and a number of ruthenium-iridium coated titanium electrolysis electrodes 255 are embedded in each group of slots. The electrodes are electrically connected to the machine box through braided copper electrode wires 253. The electrode wires 253 cover an area 15 cm below the output port of the input pipe group 13 to form a three-dimensional electrolysis field to ensure full contact between the wastewater and the electrodes. When the wastewater impacts the electrodes, micro-turbulence is generated, enabling the CN - to fully contact with the oxidants such as ClO - and O 3 produced by electrolysis, and the initial oxidation efficiency is increased by 35%. The rectangular wave pulse output by the power supply breaks through the colloidal film in the wastewater through an instantaneous high voltage (20 - 24V), exposing the encapsulated cyanide to the oxidation environment, and the cracking efficiency is increased by 28%.

[0037] It should be further noted that the H + produced by electrolysis can be neutralized with the NaOH solution for subsequent pH adjustment to form a local pH gradient field, promoting the conversion of CNO - to CO 2 , and the subsequent treatment load of the branch cavity is reduced by 40%.

[0038] Example 3, please refer to Figure 2 and Figure 4 . Based on the content described in the above example, for the specific implementation structure of the photocatalytic oxidation system 23, the design of this example is as follows: The main body of the oxidation support frame 27 is the support frame main body 272. There are two support frame main bodies 272, which are installed on the upper and lower sides of the middle support bar 24. Reinforcing support feet 271 are also provided at the corners of the support frame main body 272, and the reinforcing support feet 271 are further supported and connected to the support frame 21; the aeration pipeline 22 is wound and installed along the trailing edge of the reinforcing support feet 271; there are two groups of photocatalytic oxidation systems 23, and each group of photocatalytic oxidation systems 23 is installed in a matching manner with the support frame main body 272. Each group of photocatalytic oxidation systems 23 includes an oxygen supply branch pipe 231, an exhaust cylinder 232, and a lighting bar 234. The oxygen supply branch pipe 231 is fixed inside the corresponding support frame main body 272, and the pipe body of the oxygen supply branch pipe 231 is communicated with the aeration pipeline 22. The exhaust cylinder 232 is fixed at the output terminal of the oxygen supply branch pipe 231. A number of exhaust holes 233 are arranged on the outer wall of the exhaust cylinder 232. In this embodiment, the support frame main body 272 is a welded frame made of 316L stainless steel, which is symmetrically installed on both sides of the middle support bar 24 in upper and lower layers to form a three-dimensional oxidation channel. Reinforcing support feet 271 (bending angle 45°) are integrated at the corners of the frame body and are rigidly connected to the support frame 21 through M8 bolts to improve the bearing strength. The aeration pipeline 22 and the oxygen supply branch pipe 231 form a uniform gas distribution network, and a nano-TiO 2 -WO 3 composite catalyst (thickness 5 μm) is formed on the surface of the exhaust cylinder 232 to form a photocatalytic reaction interface.

[0039] The lighting bar 234 is fixed to the outer wall of the pipe body of the corresponding exhaust hole 233 through a fixing bolt 235. Lighting ridges 236 are provided on the edge of the frame body of the lighting bar 234, and a number of spotlights 237 are provided on the lighting ridges 236; a heating plate 238 is also provided inside the frame body of the lighting bar 234, and a number of electric heaters 239 are provided on the heating plate 238. The lighting bar 234 is a lighting enhancement structure, The lighting bar 234 is a rectangular frame body made of aluminum alloy profiles (surface anodized), which is locked on the outer wall of the exhaust cylinder 232. The lighting ridges 236 are triangular prism bars provided on the frame body, with a silver-plated reflective layer on the surface. There are 12 groups of spotlights 237 inside. The spotlights 237 are of the UV-C LED type to form a multi-directional diffuse light field. The heating plate 238 is an integrated ceramic heating plate on the back of the frame body, with 6 groups of electric heaters 239 inside, and the surface temperature of the catalyst is maintained at 35 - 45 °C through PID temperature control.

[0040] During treatment, O 2 input by the aeration pipeline 22 is transported to the exhaust cylinder 232 through the oxygen supply branch pipe 231, and a micro-nano bubble layer is formed through the exhaust holes 233. The spotlights 237 excite TiO 2 -WO 3 catalyst to generate electron-hole pairs, and the holes react with H 2 O / OH- The reaction generates ·OH free radicals, and at the same time, O 2 captures electrons to form O 2 - . The heating plate 238 maintains the working temperature of the catalyst, reduces the reaction activation energy, and increases the mineralization reaction rate of CNO - .

[0041] The pretreated wastewater by electrolysis (containing CNO - ) enters the support frame and contacts with the O 2 / O 3 mixed gas, and the following chain oxidation reaction occurs under photocatalysis: CNO - + 2·OH → CO 2 + N 2 + H 2 O O 3 + H 2 O → 2·OH + O 2 This photocatalytic oxidation system significantly improves the harmless treatment efficiency of cyanide in chlorobenzonitrile wastewater through the construction of a multiphase reaction field, the enhancement of photothermal coupling, and intelligent regulation technology. At the same time, it reduces the operating cost and provides an innovative technical path for the advanced treatment of chemical wastewater.

[0042] Example 4, please refer to Figure 1 and Figure 5 . Based on the content described in the above embodiments, for the specific implementation structure of the alkalization feeder 31, the present embodiment is designed as follows: The alkalization feeder 31 includes a support sleeve 311, an auxiliary material adder 312 mounted on the support sleeve 311, and an acid-base adjustment pipe 313 installed at the output end of the auxiliary material adder 312. A flow controller 314 is installed between the output end of the auxiliary material adder 312 and the acid-base adjustment pipe 313. The auxiliary support frame 32 is installed at the end of the acid-base adjustment pipe 313. The main body of the auxiliary support frame 32 is an auxiliary material diffusion outer support frame 321. A diffuser 315 is arranged inside the auxiliary material diffusion outer support frame 321. A diffusion panel 316 is arranged on the diffuser 315. The pipe body of the acid-base adjustment pipe 313 is connected to the diffuser 315; the diffuser 315 is used to atomize the NaOH alkaline emulsion, and through the diffusion panel 316, the medicament is fully contacted with the wastewater to form a pH gradient field, neutralize the H⁺ generated by electrolysis, and precipitate heavy metals.

[0043] An inner support bar 322 is provided inside the inner frame of the auxiliary material diffusion outer support frame 321, and a pH detector 323 is provided on the inner support bar 322. The pH detector 323 collects the pH value of the mixed solution in real time. If the detected value is lower than the set threshold, the PLC system increases the opening of the flow controller 314 through a 4-20 mA signal; if the pH value exceeds the standard, an alarm is triggered and the chemical dosing is stopped, and at the same time, the bypass valve is opened for dilution. This embodiment is linked with the electrolysis system and the photocatalysis system to form an "oxidation-neutralization-precipitation" integrated treatment process, with the COD removal rate increased by 40%, significantly improving the neutralization treatment efficiency of chlorobenzonitrile wastewater.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0045] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A synchronous wastewater treatment system based on a chlorobenzonitrile synthesis process, comprising a treatment box (1), wherein a plurality of partition plates (11) are arranged in the box body of the treatment box (1), the partition plates (11) divide the inner cavity of the treatment box (1) into a plurality of reaction branch cavities (12), the partition plates (11) are provided with water inlets, and adjacent reaction branch cavities (12) are connected in sequence through the water inlets, characterized in that: Each reaction branch chamber (12) is provided with an electrolytic cyanide destruction system (2) and a pH adjustment system (3); the electrolytic cyanide destruction system (2) comprises a support frame (21) and an oxidation support frame (27); the support frame (21) is fixedly mounted on the cavity wall of the corresponding reaction branch chamber (12) via a fixed substrate (26); electrolyzers (25) are provided on both sides of the inner frame of the support frame (21); the electrolyzers (25) on both sides form an electrolysis area and are located at the output port of the input pipe group (13); An aeration pipeline (22) is wound around the frame of the support frame (21); a middle support fence (24) is supported at the front end of the support frame (21); the oxidation support frame (27) is mounted on the middle support fence (24); a photocatalytic oxidation system (23) is arranged on the oxidation support frame (27); and a pipe body of the aeration pipeline (22) is connected to the photocatalytic oxidation system (23); The pH adjustment system (3) and the electrolytic cyanide destruction system (2) are arranged relative to each other; The pH adjustment system (3) comprises an alkalization supplier (31) and an auxiliary support frame (32); the output end of the alkalization supplier (31) is arranged in a frame body of the auxiliary support frame (32), and the auxiliary support frame (32) is located in a reaction area of ​​the photocatalytic oxidation system (23).

2. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 1, characterized in that: The electrolyzer (25) comprises an electrolysis box (251) and an electrolysis support (254); the electrolysis box (251) is fixed to the frame of the support frame (21) via a fixing seat (252); the electrolysis support (254) is fixed to the inner edge of the frame of the support frame (21); a power supply line of the electrolysis box (251) passes through the frame of the support frame (21) and is electrically connected to the electrolysis support (254); a plurality of electrolysis electrodes (255) are arranged on the electrolysis support (254); and electrode wires (253) are installed on the electrolysis electrodes (255); The electrode line (253) is located at the output port of the input pipe group (13).

3. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 1, characterized in that: The main body of the oxidation support frame (27) is a support frame main body (272), and the support frame main body (272) is provided with two upper and lower sides on which a middle support fence (24) is installed. The corners of the support frame main body (272) are also provided with reinforcing legs (271), and the reinforcing legs (271) are further supported and connected to the support frame (21). The aeration pipeline (22) is wound around and installed on the rear edge of the reinforcing legs (271).

4. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 3, characterized in that: The photocatalytic oxidation system (23) is provided in two groups, each group of the photocatalytic oxidation system (23) is matched and installed with the supporting frame body (272), and each group of the photocatalytic oxidation system (23) comprises an oxygen branch pipe (231), an exhaust pipe (232) and a light fence (234). The oxygen branch pipe (231) is fixed in the frame of the corresponding supporting frame body (272); the pipe body of the oxygen branch pipe (231) is connected to the aeration pipeline (22); the exhaust pipe (232) is fixed to the output terminal of the oxygen branch pipe (231); and a plurality of exhaust holes (233) are arranged on the outer wall of the exhaust pipe (232). The lighting bar (234) is fixed to the outer wall of the tube body of the corresponding exhaust hole (233) via a fixing bolt (235), and the edges of the frame of the lighting bar (234) are provided with lighting ribs (236), and a plurality of spotlights (237) are provided on the lighting ribs (236).

5. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 4, characterized in that: A heating plate (238) is also provided in the frame of the illumination column (234), and a plurality of electric heaters (239) are provided on the heating plate (238).

6. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 1, characterized in that: The alkalization feeder (31) comprises a support sleeve (311), an auxiliary material adder (312) mounted on the support sleeve (311), and an acid-base regulating tube (313) mounted on the output end of the auxiliary material adder (312); a flow controller (314) is mounted between the output end of the auxiliary material adder (312) and the acid-base regulating tube (313); and the auxiliary support frame (32) is mounted on the terminal end of the acid-base regulating tube (313).

7. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 6, characterized in that: The main body of the auxiliary support frame (32) is an auxiliary material diffusion outer support frame (321), a diffuser (315) is arranged inside the auxiliary material diffusion outer support frame (321), a diffusion panel (316) is arranged on the diffuser (315), and the body of the acid-base regulating tube (313) is connected to the diffuser (315).

8. The synchronous wastewater treatment system based on the chlorobenzonitrile synthesis process according to claim 7, characterized in that: An inner frame of the auxiliary material diffusion outer support frame (321) is provided with an inner support fence (322), and a pH detector (323) is provided on the inner support fence (322).

Images