Coal chemical wastewater treatment device

Abstract

The invention discloses a coal chemical industry wastewater treatment device, and relates to the technical field of industrial wastewater treatment equipment, the coal chemical industry wastewater treatment device comprises a box body and a pH adjusting assembly, a first partition plate is arranged in the box body, and the first partition plate divides the interior of the box body into a first reaction zone and a second reaction zone. The pH adjusting assembly comprises a lifting box, a pH detection part and an acid-base injection pipe, the lifting box is provided with a liquid storage tank, the lifting box is slidably connected with the first partition plate and can take liquid from the first reaction area through the liquid storage tank during sliding, and the pH detection part can detect the pH value of liquid in the lifting box when the lifting box gets close; the acid-alkali injection pipe is arranged on the box body and can inject acid liquor or alkali liquor into the lifting box according to the pH value detected by the pH detection part. The pH detection piece of the coal chemical industry wastewater treatment device can accurately detect the pH value of liquid in the liquid storage tank of the lifting box in real time, so that acid liquor or alkali liquor is accurately injected into the lifting box through the acid-alkali injection pipe according to an actual detection result to carry out pH regulation, and pH regulation and control are accurate and high in efficiency.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment equipment technology, specifically to a coal chemical wastewater treatment device. Background Technology

[0002] Coal chemical wastewater is a typical high-difficulty organic wastewater discharged during coal-to-methanol, coal-to-olefins, coking, and coal-to-natural gas production processes. Its water quality is characterized by "three highs and one difficulty": high pollutant concentrations, with COD generally ranging from 1000-5000 mg / L, and some coking wastewater reaching CODs exceeding 8000 mg / L; ammonia nitrogen concentrations typically 100-500 mg / L, accompanied by high concentrations of inorganic pollutants such as sulfides and cyanides; a high proportion of recalcitrant components, containing large amounts of structurally stable organic pollutants such as phenols, polycyclic aromatic hydrocarbons, heterocyclic compounds, and long-chain alkanes; strong biotoxicity, with phenol concentrations typically 500-2000 mg / L and cyanide concentrations 1-10 mg / L, exhibiting strong inhibitory effects on microorganisms; and extremely poor biodegradability, with BOD5 / COD ratios generally below 0.3. In the pretreatment process of coal chemical wastewater, precise pH control is one of the key factors ensuring the efficient operation of subsequent treatment processes.

[0003] However, existing technologies for pH control still have shortcomings. For example, pH control often uses simple acid-base neutralization methods, which usually involves adjusting the pH of all water bodies as a whole. Since acid-base regulators are difficult to make uniform contact with the entire water body in a short time after being added, the pH adjustment accuracy is inaccurate, affecting the overall wastewater treatment efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a coal chemical wastewater treatment device. This device solves the technical problem that existing technologies often use simple acid-base neutralization methods for pH control, which typically involves overall pH control of all water bodies. However, because acid-base regulators are difficult to uniformly contact the entire water body in a short time after being added, the pH adjustment accuracy is inaccurate, affecting the overall wastewater treatment efficiency.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a coal chemical wastewater treatment device, comprising: The housing includes a first partition that divides the interior of the housing into a first reaction zone and a second reaction zone; The pH adjustment component includes a lifting tank, a pH sensor, and an acid / base injection pipe. The lifting tank has a liquid storage tank. The lifting tank is slidably connected to the first partition and can draw liquid from the first reaction zone through the liquid storage tank when sliding. The pH sensor can detect the pH value of the liquid inside the lifting tank when it is close to it. The acid / base injection pipe is located in the tank and can inject acid or alkali solution into the lifting tank according to the pH value detected by the pH sensor.

[0006] In some embodiments, the acid-base injection tube includes a first tube and a second tube, one end of the first tube and the second tube are respectively connected to an acid source and an alkali source, and the other end of the first tube and the second tube is located directly above the lifting box.

[0007] In some embodiments, the pH adjustment assembly further includes a main controller, the acid source and the alkali source have a first pump body and a second pump body, the pH sensor, the first pump body and the second pump body are all connected to the main controller, the main controller is used to automatically control the first pump body and the second pump body according to the pH value fed back by the pH sensor, so that the acid source injects acid into the storage tank or the alkali source injects alkali into the storage tank.

[0008] In some embodiments, the coal chemical wastewater treatment device further includes a support mesh frame and iron-carbon composite particles disposed in the first reaction zone. The support mesh frame is connected to the inner wall of the box and has a plurality of mesh holes arranged in an array, and the iron-carbon composite particles are filled with the plurality of mesh holes.

[0009] In some embodiments, the coal chemical wastewater treatment device further includes a first circulating pump and a first return pipe. The two ends of the first return pipe are connected to the tank and located on the upper and lower sides of the support frame. The first circulating pump is located on the first return pipe and is used to drive the liquid at the top of the support frame to return to the bottom through the first return pipe.

[0010] In some embodiments, the housing is provided with a second partition, which is located in the second reaction zone and divides the second reaction zone into a first chamber and a second chamber. One end of the first partition and the second partition are respectively connected to the bottom and top of the housing, and the other end is not connected to the housing, so that the first reaction zone, the first chamber and the second chamber are connected in sequence and form an arc-shaped flow channel.

[0011] In some embodiments, the housing has an inlet and an outlet, the outlet being located at the top of the housing and communicating with the second chamber, and the inlet being located at the bottom of the housing and communicating with the first reaction zone.

[0012] In some embodiments, the coal chemical wastewater treatment device further includes a second circulation pump and a second return pipe, one end of the second return pipe being connected to the inlet and the other end being connected to the second chamber, and the second circulation pump being disposed in the second return pipe.

[0013] In some embodiments, the coal chemical wastewater treatment device further includes an aeration disc disposed at the bottom of the second chamber.

[0014] In some embodiments, the housing is further provided with a hydrogen peroxide dosing port and a ferric sulfate replenishment port that communicate with the second cavity.

[0015] Compared with the prior art, the coal chemical wastewater treatment device provided by the present invention can gradually sample the wastewater in the first reaction zone by sliding the lifting box up and down. After the lifting box completes the sampling, the wastewater in the lifting box can be separated from the large amount of wastewater in the first reaction zone. The pH detection device can accurately detect the pH value of the liquid in the liquid storage tank of the lifting box in real time. Based on the actual detection results, the corresponding amount of acid or alkali solution is accurately injected into the lifting box through the acid-alkali injection pipe for pH adjustment. Since the amount of wastewater picked up by the lifting box is not large, the acid and alkali solutions injected into the lifting box through the acid-alkali injection pipe can react with the wastewater in the lifting box quickly and evenly. The pH adjustment is fast and accurate, so that the pH of the wastewater can reach the range required by the subsequent treatment process more accurately and quickly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the coal chemical wastewater treatment device provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] To address the technical problems of existing technologies that often employ simple acid-base neutralization for pH control, which fails to stratify water bodies and typically involves overall pH control of all water bodies, resulting in large amounts of pH control agents and inaccurate pH adjustment, thus affecting overall treatment efficiency, this invention provides a coal chemical wastewater treatment device that enables local sampling of water bodies. By measuring the pH value, it can respond more quickly to pH changes, adjust the acid and alkali injection amounts in a timely manner, and improve the efficiency of pH control.

[0019] It should be noted that the coal chemical wastewater treatment device described in this invention is used for, but not limited to, treating coal chemical wastewater. For ease of explanation, this invention will only use the application of the coal chemical wastewater treatment device in treating coal chemical wastewater as an example. The principle of the coal chemical wastewater treatment device applied to other types of equipment is essentially the same as that applied to treating coal chemical wastewater, and will not be described in detail here.

[0020] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a coal chemical wastewater treatment device in one embodiment of the present invention. The coal chemical wastewater treatment device includes a box 1 and a pH adjustment component 2 disposed in the box 1. A first partition 11 is provided inside the box 1, which divides the inside of the box 1 into a first reaction zone 12 and a second reaction zone 13.

[0021] The pH adjustment assembly 2 includes a lifting box 21, a pH sensor 22, and an acid-base injection pipe 23. The lifting box 21 has a liquid storage tank 211. The lifting box 21 is slidably connected to the first partition 11 in the vertical direction and can take liquid from the first reaction zone 12 through the liquid storage tank 211 when sliding. The pH sensor 22 can detect the pH value of the liquid inside the lifting box 21 when it is close to it. The acid-base injection pipe 23 is located in the box body 1 and can inject acid or alkali into the lifting box 21 according to the pH value detected by the pH sensor 22.

[0022] In this embodiment, the interior of the tank 1 is used for the inflow of wastewater to be treated, which is then purified through micro-expansion fluidization, pH adjustment, and airlift fluidization. An inlet 14 is located at the bottom left side of the tank 1, through which the wastewater enters the first reaction zone 12. After micro-expansion fluidization treatment in the first reaction zone 12, the pH value of the treated wastewater is adjusted by the pH adjustment component 2. The lifting tank 21 contains a storage tank 211 for storing wastewater. The lifting tank 21 is slidably engaged with the first partition 11. The lifting and lowering of the lifting tank 21 is powered by a corresponding drive component. The structure of the drive component is not limited; for example, it can be an existing structure consisting of a reel, steel rope, and motor. The steel rope is connected to the top of the lifting tank 21 and wound around the reel. The motor is connected to the reel and can drive the reel to rotate, thereby raising and lowering the lifting tank 21 by rotating the reel to wind up and unwind the steel rope.

[0023] The top of the lifting tank 21 is open and has a liquid inlet 212. The liquid inlet 212 is connected to the liquid storage tank 211. It can be understood that the top of the liquid storage tank 211 is the liquid inlet 212. When the lifting tank 21 slides, it takes liquid from the first reaction zone 12 through the liquid storage tank 211. After the lifting tank 21 finishes taking water, it rises and separates from the remaining sewage in the first reaction zone. The sewage in the lifting tank 21 is isolated from the sewage in the first reaction zone. When an acid-base neutralizing agent is added to the lifting tank 21, it will not be affected by the remaining sewage in the first reaction zone. The acid-base neutralizing agent will only react with the sewage in the lifting tank 21. Since the amount of sewage in the lifting tank 21 is not large, the acid-base neutralizing agent can quickly and evenly contact the sewage in the lifting tank 21, and adjust the pH of the sewage accurately and quickly.

[0024] The pH sensor 22 can be inserted into the lifting tank 21 when it rises to a certain height, contacting the wastewater in the storage tank 211 inside the lifting tank 21 to detect the pH value of the wastewater. The acid / alkali injection pipe 23 is located in the tank 1 and can inject acid or alkali solution into the lifting tank 21 according to the pH value detected by the pH sensor 22. Simultaneously, the pH sensor 22 monitors the pH value of the wastewater in real time. When the wastewater in the storage tank 211 is adjusted to a preset pH range, the wastewater is then discharged into the second reaction zone 13 for gas fluidization treatment. This cycle continues until the lifting tank 21 has removed all the wastewater from the first reaction zone 12. In one embodiment, a 10% sulfuric acid solution is added using the acid / alkali injection pipe 23 to precisely adjust the wastewater pH to 2.5-3.5 before discharging it into the second reaction zone.

[0025] An agitator 19 is rotatably mounted inside the tank 1. The agitator 19 is connected to a drive motor 20 located on the top of the tank 1, and the agitator 19 can rotate under the drive of the drive motor 20. When the lifting tank 21 rises to a certain height, the agitator 19 can come into contact with the sewage in the lifting tank 21 to agitate the sewage. Especially when acid or alkali is injected into the lifting tank 21, the agitation by the agitator 19 can make the sewage in the lifting tank 21 come into contact with the acid or alkali more evenly and quickly and react, and the pH value of the sewage monitored by the pH detection device 22 is more accurate.

[0026] The bottom of the lifting tank 21 has a guide ramp 213, and the lowest point of the guide ramp 213 has a liquid outlet 214, so that the wastewater in the storage tank 211 can flow to the liquid outlet 214 and be fully discharged from the liquid outlet 214. After the wastewater in the storage tank 211 has been pH adjusted, the liquid outlet 214 can be opened. The first partition 11 has an outlet hole near the top. When the lifting tank 21 rises to the outlet hole position, the liquid outlet 214 is opened to discharge the wastewater into the second reaction zone 13. This allows the liquid in the storage tank 211 to flow into the second reaction zone 13 through the liquid outlet 214. The liquid outlet 214 and the liquid inlet 212 are both controlled to open or close by corresponding solenoid valves, which can be remotely controlled.

[0027] In one embodiment, please refer to Figure 1 The acid-base injection pipe 23 includes a first pipe body 231 and a second pipe body 232. One end of the first pipe body 231 and the second pipe body 232 are respectively connected to an acid source and an alkali source, and the other end of the first pipe body 231 and the second pipe body 232 is located directly above the lifting box 21. In this embodiment, the top of the lifting box 21 has multiple through holes, which are correspondingly arranged with the first pipe body 231 and the second pipe body 232. When the lifting box 21 slides upward, the first pipe body 231 and the second pipe body 232 can be inserted into the lifting box 21. When it is necessary to adjust the pH value, the acid source and the alkali source can be driven to inject acid or alkali into the lifting box 21 through the first pipe body 231 and the second pipe body 232, respectively. The acid can be, for example, sulfuric acid, and the alkali can be, for example, sodium hydroxide or potassium hydroxide.

[0028] In one embodiment, please refer to Figure 1The pH adjustment component also includes a main controller (not shown in the figure). The acid source and alkali source each have a first pump and a second pump (not shown in the figure). The pH sensor 22, the first pump, and the second pump are all connected to the main controller. The main controller automatically controls the first and second pumps based on the pH value fed back by the pH sensor 22, so that the acid source injects acid into the storage tank 211 or the alkali source injects alkali into the storage tank 211. In this embodiment, the main controller can be an STC89C52 microcontroller, which has advantages such as stable performance, low power consumption, and large storage capacity. It internally includes 8KB of ROM memory, 256KB of RAM, two timers, thirty-two programmable I / O lines, and eight interrupt sources, making it suitable for control systems with certain data processing requirements and a large number of I / O ports. The main controller can accurately control the operation of the first and second pumps based on the real-time pH value fed back by the pH sensor, thereby achieving precise control of the injection volume of acid and alkali. This automated control method ensures that the pH value of the liquid in the storage tank 211 is always maintained within the set range, avoiding errors and lags that may occur with manual operation, and improving the accuracy and stability of pH control. The automated control of the main controller reduces manual intervention in the pH adjustment process. Operators no longer need to frequently adjust the acid and alkali injection volumes; they only need to set the pH control parameters, and the main controller can automatically complete the subsequent adjustment work, reducing operational difficulty and labor intensity, while also minimizing operational errors caused by human factors.

[0029] In one embodiment, please refer to Figure 1 The coal chemical wastewater treatment device also includes a support mesh frame 31 and iron-carbon composite particles 32 located in the first reaction zone 12. The support mesh frame 31 is connected to the inner wall of the housing 1 and has multiple mesh holes arranged in an array. The iron-carbon composite particles are filled with multiple mesh holes. In this embodiment, the support mesh frame 31, by filling the mesh holes with iron-carbon composite particles, can significantly increase the contact area between wastewater and iron-carbon composite particles. When treating wastewater, the iron-carbon composite particles generate a large number of microbubbles through micro-electrolysis. These bubbles can effectively carry pollutants in the wastewater to the particle surface for reaction, thereby improving mass transfer efficiency and accelerating the degradation of wastewater pollutants. In this embodiment, the iron-carbon composite particles (Fe:C=1.5:1, particle size 2-4mm, density 3.5-4.0g / cm³) have a filling rate of 40%-50%. After the wastewater undergoes a preliminary reaction with the iron-carbon composite particles 32 in the first reaction zone 12, the iron-carbon micro-electrolysis generates Fe 2+ (Concentration 70-100 mg / L) This process reduces pollutants such as broken-chain heterocyclic compounds in wastewater. After passing through a lifting tank 21 to adjust the pH to 2.5-3.5, the wastewater is then discharged into the second reaction zone 13 for the Fenton reaction. This process provides the necessary ferrous ions for the Fenton reaction and reduces Fe... 2+ The addition of raw materials saved costs.

[0030] Furthermore, supported by the supporting mesh frame 31, the iron-carbon composite particles 32 can be evenly distributed within the first reaction zone 12, preventing particle accumulation and clogging, and ensuring the continuous progress of the reaction. This uniform distribution allows pollutants in the wastewater to come into more uniform contact with the iron-carbon composite particles, thereby improving the efficiency and effectiveness of the reaction.

[0031] Further, please refer to Figure 1 The coal chemical wastewater treatment device also includes a first circulating pump 41 and a first return pipe 42. The two ends of the first return pipe 42 are connected to the housing 1 and located on the upper and lower sides of the supporting mesh frame 31. The first circulating pump 41 is located on the first return pipe 42 and is used to drive the liquid at the top of the supporting mesh frame 31 back to the bottom through the first return pipe 42. In this embodiment, the arrangement of the first circulating pump 41 and the first return pipe 42 enables the liquid at the top of the supporting mesh frame 31 to return to the bottom through the first return pipe 42, forming a circulating flow. This allows pollutants in the wastewater to come into contact with the iron-carbon composite particles 32 multiple times, enhancing the mass transfer effect and improving the degradation efficiency of the pollutants.

[0032] In one embodiment, please refer to Figure 1 The tank 1 is equipped with a second partition 15, which is located in the second reaction zone 13 and divides the second reaction zone 13 into a first chamber 131 and a second chamber 132. One end of the first partition 11 and the second partition 15 are connected to the bottom and top of the tank 1, respectively, while the other end is not connected to the tank 1, so that the first reaction zone 12, the first chamber 131, and the second chamber 132 are sequentially connected and form an arc-shaped flow channel. In this embodiment, the arc-shaped flow channel can significantly extend the flow path of wastewater in the tank, thereby significantly increasing the residence time of wastewater in the tank 1, providing more reaction time for pollutants in the wastewater and improving the wastewater treatment effect. The separation of the first reaction zone 12, the first chamber 131, and the second chamber 132 allows the wastewater treatment process to be carried out in multiple stages. In the first reaction zone 12, the wastewater first comes into contact with the treatment medium such as iron-carbon composite particles 32 for preliminary degradation and treatment; then it enters the first chamber 131 and the second chamber 132 for further treatment. This phased treatment method allows for targeted treatment of different types of pollutants, improving the overall treatment effect. Furthermore, the second partition 15 optimizes the use of space within the housing 1, creating a compact, arc-shaped flow channel and increasing the space utilization rate of the housing 1. In one embodiment, please refer to... Figure 1 In addition to the aforementioned entrance 14, the box 1 also has an exit 16. The exit 16 is located at the top of the box 1 and connects to the second chamber 132, while the entrance 14 is located at the bottom of the box 1 and connects to the first reaction zone 12.

[0033] In one embodiment, please refer to Figure 1 The coal chemical wastewater treatment device also includes a second circulation pump 51 and a second return pipe 52. One end of the second return pipe 52 is connected to the inlet 14, and the other end is connected to the second chamber 132. The second circulation pump 51 is located in the second return pipe 52. In this embodiment, the wastewater to be treated, driven by the second circulation pump 51, can enter the first reaction zone 12 from the inlet 14 at the bottom of the tank 1 through the second return pipe 52. After being treated by the first reaction zone 12, the first chamber 131, and the second chamber 132, it is discharged from the outlet 16 at the top, which increases the residence time of the wastewater in the tank 1, providing more reaction time for the pollutants in the wastewater and improving the treatment effect. After the reaction, the supernatant of the second reaction zone 13 (Fenton zone) contains a certain amount of ferric ions. The ferric ions are returned to the first reaction zone 12 through the second return pipe 52 to provide ferric ions for the oxidation reaction of the newly entered wastewater in the first reaction zone 12. The dynamic iron circulation system realizes the Fe 2+ High-efficiency recycling of Fe produced by the iron-carbon reaction 2+ To meet the reaction requirements of the second reaction zone 13 (Fenton zone), the amount of FeSO4 supplemented in the second reaction zone 13 is reduced, thus lowering reagent costs. In one embodiment, please refer to... Figure 1 The coal chemical wastewater treatment device also includes an aeration disc 6 located at the bottom of the second chamber 132. The aeration disc 6, situated at the bottom of the second chamber 132, effectively injects air into the wastewater, increasing the dissolved oxygen content. This is crucial for subsequent biological treatment processes, as microbial growth and metabolism require sufficient dissolved oxygen to maintain their activity, thereby improving the efficiency of biological treatment. Furthermore, the aeration disc 6 works in conjunction with the second circulation pump 51 (recirculation ratio 40%-60%), creating turbulence in the second chamber 132, which helps accelerate the wastewater's reaction efficiency.

[0034] In one embodiment, please refer to Figure 1 The chamber 1 is also equipped with a hydrogen peroxide inlet 17 and a ferric sulfate replenishment inlet 18, both connecting to the second chamber 132. In this embodiment, hydrogen peroxide is a strong oxidant. Adding hydrogen peroxide to the second chamber 132 through the inlet 17 further oxidizes organic pollutants in the wastewater, decomposing them into more easily degradable substances, thereby improving the biodegradability of the wastewater. The oxidizing effect of hydrogen peroxide can also remove some color and odor from the wastewater, improving its quality. Ferric sulfate is a commonly used flocculant. Adding ferric sulfate to the second chamber 132 through the replenishment inlet 18 allows it to combine with suspended solids and colloidal particles in the wastewater, forming larger flocs and accelerating the sedimentation of pollutants. The combined use of hydrogen peroxide and ferric sulfate can significantly improve wastewater treatment efficiency.

[0035] The wastewater treatment effect of this invention is further illustrated below using examples of treating coking wastewater and coal-to-methanol wastewater: (a) Treatment of coking wastewater 1. Wastewater composition: COD=4200mg / L, phenols=1500mg / L, pyridine=120mg / L, BOD5 / COD=0.21, pH=8.3, suspended solids=720mg / L.

[0036] 2. Equipment parameters ① Left and right integrated equipment: The total height of the box 1 is 15m, the diameter of the first reaction zone 12 (iron-carbon zone) is 2m, the diameter of the second reaction zone 13 (Fenton zone) is 2.2m, and the height of both is 12m; ② First reaction zone 12 (iron-carbon zone): Adjust the iron-carbon ratio to Fe:C=1.8:1 according to water quality characteristics, particle size 3mm, circulation pump reflux ratio 60%, expansion rate 7%-8%, Fe 2+ The concentration generated remained stable at 85-95 mg / L; ③ pH fine-tuning zone: The amount of sulfuric acid added is adjusted to stabilize the pH at 3.0; ④ Second reaction zone 13 (Fenton zone): internal circulation reflux ratio 50%, hydrogen peroxide dosage 5.04 g / L; ⑤ Recycling of Fe3+: Through online monitoring and linkage adjustment of the main controller and terminal equipment, the reflux ratio is stabilized at 15%-20%, Fe3+... 2+ The concentration was maintained at 70-90 mg / L.

[0037] 3. Treatment effect The wastewater discharged from outlet 16 of tank 1 was tested, and the following results were obtained: ① Effluent COD = 840 mg / L (removal rate 80%), phenols = 110 mg / L (92.7%), pyridine = 15 mg / L (87.5%). ② The FeSO4 supplementation amount is only 15 mg / L (traditional split equipment requires 50 mg / L to treat the same batch of wastewater), saving 70% of the reagents; ③ BOD5 / COD = 0.43, which directly meets the influent requirements of the biological system.

[0038] (II) Example 2: Treatment of coal-to-methanol wastewater 1. Wastewater composition: COD=3200mg / L, phenols=950mg / L, naphthalene=85mg / L, BOD5 / COD=0.24, pH=8.1, suspended solids=550mg / L.

[0039] 2. Key parameters: ① The reflux ratio of the first circulating pump 41 is 50%, the expansion rate is 6%-7%, and Fe 2+ The concentration produced is 90-100 mg / L; ② The hydrogen peroxide dosage in the second reaction zone 13 (Fenton zone) is 3.84 g / L, the ferric iron reflux ratio is 10%, and the Fe... 2+ The concentration remained stable at 80-95 mg / L; 3. Treatment effect The wastewater discharged from outlet 16 of tank 1 was tested, and the following results were obtained: ① Effluent COD = 960 mg / L (removal rate 70%), phenols = 66 mg / L (93.1%), naphthalene = 7.6 mg / L (91.1%). ②No FeSO4 needs to be added throughout the entire process (the traditional process requires 40 mg / L), saving 100% of the reagents; ③ BOD5 / COD = 0.41, directly enters the biochemical system.

[0040] Comparative experiment 1. Comparison of coking wastewater ① The same batch of coking wastewater was treated using a traditional split-type equipment (iron-carbon + Fenton). The results showed that the COD removal rate was 62% (80% in this invention) and the phenol removal rate was 81% (92.7% in this invention). ②The traditional split equipment occupies 2.1 times the space of the integrated equipment, and the iron sludge output is 0.95 kg / ton of water (0.42 kg / ton of water in this invention). ③The FeSO4 replenishment amount for traditional split-type equipment is 50 mg / L (15 mg / L in this invention).

[0041] 2. Comparison of wastewater from coal-to-methanol production: ① The same batch of coal-to-methanol wastewater was treated using a traditional split-type equipment (iron-carbon + Fenton). The results showed that the COD removal rate was 58% (70% in this invention), the phenol removal rate was 79% (93.1% in this invention), and the naphthalene removal rate was 65% (91.1% in this invention). ②The traditional split equipment occupies 2.0 times the space of the integrated equipment, and the iron sludge output is 0.88 kg / ton of water (0.35 kg / ton of water in this invention). ③ The traditional split-type equipment requires 40 mg / L of FeSO4 to be added (0 mg / L in this invention), and the reagent cost is 2.8 times that of this invention.

[0042] Therefore, the wastewater treatment device of the present invention not only occupies a smaller area but also has a better wastewater treatment effect.

[0043] To better understand this invention, the following is combined with... Figure 1 The technical solution of the present invention will be described in detail below: The coal chemical wastewater treatment device provided by this invention can accurately detect the pH value of the liquid in the storage tank 211 of the lifting tank 21 in real time through the pH detection element 22. Based on the actual detection results, it can precisely inject the corresponding amount of acid or alkali solution into the lifting tank 21 through the acid-alkali injection pipe 23 to adjust the pH. This avoids the problem of inaccurate pH control caused by the lack of precise detection in traditional simple acid-alkali neutralization methods, allowing the wastewater pH to reach the range required by subsequent treatment processes more accurately. Furthermore, compared with the traditional method of overall pH control of the water body, this invention, through the sliding liquid extraction of the lifting tank 21, can perform targeted pH detection and adjustment of the local water body in the first reaction zone 12, enabling faster response to pH changes and timely adjustment of the acid-alkali injection volume, thus improving the efficiency of pH control.

[0044] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A coal chemical wastewater treatment device, characterized in that, include: The box body is provided with a first partition, which divides the interior of the box body into a first reaction zone and a second reaction zone. and The pH adjustment component includes a lifting tank, a pH sensor, and an acid / base injection pipe. The lifting tank has a liquid storage tank. The lifting tank is slidably connected to the first partition and can take liquid from the first reaction zone through the liquid storage tank when sliding. The pH sensor is configured to detect the pH value of the liquid inside the lifting tank. The acid / base injection pipe is located in the tank body and is configured to inject acid or alkali solution into the lifting tank.

2. The coal chemical wastewater treatment device according to claim 1, characterized in that, The acid-base injection pipe includes a first pipe body and a second pipe body. One end of the first pipe body and the second pipe body are respectively connected to an acid source and an alkali source, and the other end of the first pipe body and the second pipe body is located directly above the lifting box.

3. The coal chemical wastewater treatment device according to claim 2, characterized in that, The pH adjustment assembly also includes a main controller. The acid source and the alkali source each have a first pump and a second pump. The pH sensor, the first pump, and the second pump are all connected to the main controller. The main controller is used to automatically control the first pump and the second pump based on the pH value fed back by the pH sensor, so that the acid source injects acid into the storage tank or the alkali source injects alkali into the storage tank.

4. The coal chemical wastewater treatment device according to claim 1, characterized in that, The coal chemical wastewater treatment device also includes a support mesh frame and iron-carbon composite particles located in the first reaction zone. The support mesh frame is connected to the inner wall of the box and has multiple mesh holes arranged in an array. The iron-carbon composite particles are filled with multiple mesh holes.

5. The coal chemical wastewater treatment device according to claim 4, characterized in that, The coal chemical wastewater treatment device also includes a first circulation pump and a first return pipe. The two ends of the first return pipe are connected to the box body and located on the upper and lower sides of the support grid. The first circulation pump is located on the first return pipe and is used to drive the liquid at the top of the support grid to return to the bottom through the first return pipe.

6. The coal chemical wastewater treatment device according to claim 1, characterized in that, The box is equipped with a second partition, which is located in the second reaction zone and divides the second reaction zone into a first chamber and a second chamber. One end of the first partition and the second partition are respectively connected to the bottom and top of the box, and the other end is not connected to the box, so that the first reaction zone, the first chamber and the second chamber are connected in sequence to form an arc-shaped flow channel.

7. The coal chemical wastewater treatment device according to claim 6, characterized in that, The box has an inlet and an outlet. The outlet is located at the top of the box and connects to the second chamber, while the inlet is located at the bottom of the box and connects to the first reaction zone.

8. The coal chemical wastewater treatment device according to claim 7, characterized in that, The coal chemical wastewater treatment device further includes a second circulation pump and a second return pipe. One end of the second return pipe is connected to the inlet, and the other end is connected to the second chamber. The second circulation pump is located in the second return pipe.

9. The coal chemical wastewater treatment device according to claim 1, characterized in that, The coal chemical wastewater treatment device also includes an aeration disc located at the bottom of the second chamber.

10. The coal chemical wastewater treatment device according to claim 1, characterized in that, The box is also equipped with a hydrogen peroxide dosing port and a ferric sulfate replenishment port that connect to the second cavity.

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