Chemical production wastewater treatment device

Abstract

The application relates to the technical field of wastewater treatment equipment, in particular to a chemical production wastewater treatment device which comprises a wastewater pumping unit, a flocculation and precipitation unit comprising a stirrer and a flocculation cavity, an aeration and electrolysis unit comprising a second water inlet, an aeration cavity, an aeration module and an electrolysis module, a resin adsorption unit comprising a third drain pipe, a water inlet cavity and a resin adsorption column, a transparency detection module arranged in the flocculation and precipitation unit, a dissolved oxygen concentration detection module arranged in the flocculation and precipitation unit, a heavy metal ion content detection module and a chroma detection module arranged in the aeration and electrolysis unit respectively, and a process determination unit used for judging whether flocculation and precipitation treatment of wastewater meets preset standards according to the transparency of the wastewater and used for judging whether aeration and electrolysis of the wastewater meets preset standards according to the heavy metal ion content in the wastewater, so that the chemical wastewater treatment efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and more particularly to a chemical production wastewater treatment device. Background Technology

[0002] Dyeing and printing wastewater and heavy metal wastewater are two important types of chemical wastewater that are subject to treatment, as they pose significant hazards to the environment and human health.

[0003] Textile dyeing and printing wastewater refers to the wastewater generated during the textile dyeing and printing process. It contains a large amount of organic pollutants, color, and some heavy metals. If this wastewater is discharged directly without treatment, it will cause serious environmental pollution. The deep color of the dyeing and printing wastewater severely affects the appearance of the receiving water body. Colored water also affects the transmission of sunlight, which is detrimental to the growth of aquatic organisms. In addition, it is difficult to remove the color of dyeing and printing wastewater using general biological methods.

[0004] Heavy metal wastewater refers to wastewater containing heavy metal ions, which pose significant hazards to the environment and human health. Common heavy metals include mercury, lead, cadmium, chromium, and arsenic, which are highly biotoxic, as well as heavy metals with some toxicity such as zinc, copper, cobalt, nickel, tin, and vanadium. If heavy metal wastewater is discharged directly without treatment, it will cause serious pollution to water bodies, soil, and ecosystems. Heavy metal ions are difficult to degrade in water and accumulate in organisms through the food chain, ultimately harming human health.

[0005] Chinese Patent Application Publication No. CN105585222A discloses a chemical wastewater treatment device, including a pretreatment unit connected in sequence to a primary enhanced treatment unit, a secondary enhanced treatment unit, and a clear water storage tank. The pretreatment unit includes an inlet pipe and a collection tank, with a rotating screen installed at the inlet of the collection tank. The primary enhanced treatment unit includes a coagulation sedimentation tank, an equalization tank, an anaerobic tank, and an aerobic tank connected in sequence, with a stirring device and an aeration device installed in the aerobic tank. The secondary enhanced treatment unit includes a secondary sedimentation tank, a disinfection tank, and a filtration device connected in sequence, with a dosing device installed on the effluent pipe of the secondary sedimentation tank. The dosing device includes a base and a storage tank, with a dosing control device installed on the storage tank. The chemical wastewater treatment device also includes a sludge treatment unit and an effluent monitoring device. It can be seen that the above technical solution does not consider the impact of changes in the transparency of the chemical wastewater on the treatment effect of wastewater pollutants, nor can it adjust the subsequent wastewater treatment process according to different wastewater colors, resulting in low chemical wastewater treatment efficiency. Summary of the Invention

[0006] Therefore, the present invention provides a chemical production wastewater treatment device to overcome the problems of low chemical wastewater treatment efficiency caused by the prior art not considering the impact of changes in transparency in chemical wastewater on the treatment effect of wastewater pollutants and not being able to change the subsequent wastewater treatment process according to different wastewater colors.

[0007] To achieve the above objectives, the present invention provides a chemical production wastewater treatment device, comprising:

[0008] Wastewater pumping unit, which is used to store chemical wastewater to be treated;

[0009] A flocculation and sedimentation unit, which is connected to the wastewater pumping unit, is used to flocculate and precipitate chemical wastewater.

[0010] An aeration electrolysis unit, which is connected to the flocculation sedimentation unit, is used to aerate and electrolyze the wastewater after flocculation sedimentation.

[0011] A resin adsorption unit, which is connected to the aeration electrolysis unit, is used to adsorb impurities in the wastewater after aeration electrolysis.

[0012] An ultrafiltration unit is connected to the aeration electrolysis unit and the resin adsorption unit respectively, and is used to perform ultrafiltration on the wastewater after aeration electrolysis and the wastewater after impurity adsorption.

[0013] The detection unit includes a transparency detection module installed in the flocculation and sedimentation unit, a dissolved oxygen concentration detection module installed in the flocculation and sedimentation unit, and a heavy metal ion content detection module and a colorimetry detection module installed in the aeration and electrolysis unit, respectively.

[0014] The process determination unit, which is connected to the flocculation and sedimentation unit, the aeration and electrolysis unit, the resin adsorption unit, the ultrafiltration unit, and the detection unit, is used to adjust the dosage of flocculant for the next batch or the stirring rate of the agitator for the next batch based on the comparison results of the transparency of the wastewater with the corresponding preset transparency. It is also used to increase the electrolysis time based on the comparison results of the heavy metal ion content in the wastewater with the corresponding preset heavy metal ion content, or to transport the wastewater after aeration and electrolysis to the ultrafiltration unit or sequentially to the resin adsorption unit and the ultrafiltration unit based on the color of the wastewater.

[0015] Furthermore, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard if the transparency of the wastewater detected by the transparency detection module is less than the second preset transparency after the agitator of the flocculation and sedimentation unit has finished stirring.

[0016] Furthermore, the process determining unit increases the amount of flocculant added in the next batch based on the difference between the first preset transparency and the transparency when the transparency is less than the first preset transparency, or increases the stirring speed of the agitator in the next batch of flocculation and sedimentation unit based on the difference between the second preset transparency and the transparency when the transparency is greater than or equal to the first preset transparency and less than the second preset transparency.

[0017] Furthermore, the process determination unit has several rate adjustment methods for increasing the stirring rate of the agitator in the next batch of flocculation and sedimentation units, and each rate adjustment method increases the stirring rate by a different amount.

[0018] Furthermore, the process determination unit has several rate correction methods for correcting the stirring rate of the agitator of the next batch of flocculation and sedimentation units under preset conditions, and each rate correction method has a different correction range for the stirring rate of the agitator of the next batch of flocculation and sedimentation units.

[0019] The preset condition is that after the stirring speed of the stirrer is increased and adjusted, the dissolved oxygen concentration in the flocculation chamber of the flocculation sedimentation unit is greater than or equal to the preset dissolved oxygen concentration.

[0020] Furthermore, the process determination unit determines that the wastewater's aeration electrolysis does not meet the preset standard based on the heavy metal ion content detected by the heavy metal ion content detection module after the aeration electrolysis unit completes the aeration electrolysis, and the heavy metal ion content is greater than or equal to the first preset heavy metal ion content.

[0021] Furthermore, the process determination unit, under the condition that the heavy metal ion content is greater than or equal to the first preset heavy metal ion content and less than the second preset heavy metal ion content, determines for the second time whether the aeration electrolysis of the wastewater meets the preset standard based on the color of the wastewater. Under the condition that the heavy metal ion content is greater than or equal to the second preset heavy metal ion content and less than the third preset heavy metal ion content, the process determination unit increases the electrolysis time. Under the condition that the heavy metal ion content is greater than or equal to the third preset heavy metal ion content, the process determination unit increases the aeration rate.

[0022] Furthermore, the process determination unit has several aeration rate adjustment methods for increasing the aeration rate, and each aeration rate adjustment method increases the aeration rate by a different amount.

[0023] Furthermore, the increase in the electrolysis time is positively correlated with the difference in the second heavy metal ion content, wherein the difference in the second heavy metal ion content is the difference between the heavy metal ion content and the second preset heavy metal ion content.

[0024] Furthermore, the process determination unit makes a secondary determination based on the color of the wastewater to determine whether the aeration and electrolysis of the wastewater meets the preset standard, wherein,

[0025] If the color intensity is less than the preset color intensity, the process determination unit will make a second determination that the aeration electrolysis of the wastewater meets the preset standard, and then transport the wastewater after aeration electrolysis to the ultrafiltration unit.

[0026] If the color intensity is greater than or equal to the preset color intensity, the process determination unit will make a secondary determination that the aeration electrolysis of the wastewater does not meet the preset standard, and will then sequentially transport the wastewater after aeration electrolysis to the resin adsorption unit and the ultrafiltration unit.

[0027] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention uses flocculant addition and stirring to cause suspended solids and organic matter in wastewater to form flocs and settle; the effectiveness of the flocculation and sedimentation treatment is verified by the transparency of the wastewater; the wastewater is aerated and electrolyzed to remove heavy metal ions; the content of heavy metal ions in the wastewater is checked to determine whether the aeration and electrolysis treatment meets preset standards, and adjustments are made accordingly based on the results; the wastewater treatment process is adjusted in real time using colorimetry, efficiently adsorbing organic matter, heavy metal ions, and other trace impurities in the wastewater, thereby improving the efficiency of chemical wastewater treatment.

[0028] Furthermore, the present invention includes a flocculation sedimentation unit and an aeration electrolysis unit. The flocculation sedimentation unit is mainly responsible for removing suspended solids, colloids, and some dissolved organic matter from the wastewater, while the aeration electrolysis unit is mainly responsible for removing heavy metal ions and other harmful substances from the wastewater. First, the flocculation sedimentation unit removes suspended solids, colloids, and other impurities from the wastewater, providing relatively clear wastewater for subsequent treatment. Then, the aeration electrolysis unit further removes heavy metal ions and other harmful substances from the wastewater, thereby effectively purifying the wastewater.

[0029] Furthermore, the present invention includes a resin adsorption unit for further removing dissolved organic matter and heavy metal ions from the wastewater, thereby achieving deep purification of the wastewater.

[0030] Furthermore, the present invention includes an ultrafiltration unit, which improves the quality of wastewater purification after ultrafiltration treatment, thereby reducing environmental pollution.

[0031] Furthermore, this invention determines whether the flocculation and sedimentation treatment of wastewater meets the preset standards based on the transparency of the wastewater. The transparency of the wastewater reflects the content of impurities such as suspended solids, colloids, and dissolved organic matter in the wastewater. The invention monitors the treatment of chemical wastewater in real time and makes intelligent adjustments, thereby improving the automation level of wastewater treatment.

[0032] Furthermore, the present invention determines whether the aeration and electrolysis of wastewater meets the preset standards based on the content of heavy metal ions in the wastewater, making the assessment more accurate and thus increasing the reliability of the assessment.

[0033] Furthermore, the present invention makes a secondary determination based on the color of the wastewater to determine whether the aeration and electrolysis of the wastewater meets the preset standard, and selects whether to perform ultrafiltration or resin adsorption followed by ultrafiltration based on the determination result, thereby flexibly selecting the wastewater treatment process and improving the wastewater treatment efficiency. Attached Figure Description

[0034] Figure 1 This is a cross-sectional view of a chemical production wastewater treatment device according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the module connection of the chemical production wastewater treatment device according to an embodiment of the present invention;

[0036] Figure 3 This is a flowchart illustrating how to determine whether the flocculation and sedimentation treatment of wastewater meets preset standards, as described in an embodiment of the present invention.

[0037] Figure 4 This is a flowchart illustrating an embodiment of the present invention for determining whether the aeration and electrolysis of wastewater meets a preset standard.

[0038] In the diagram, 1. Wastewater pumping unit; 11. Storage chamber; 12. First drain pipe; 13. First water pump; 2. Flocculation and sedimentation unit; 21. Second drain pipe; 22. Flocculation chamber; 23. Agitator; 241. Electric valve; 242. Connecting pipe; 243. Storage tank; 25. Second water pump; 3. Aeration and electrolysis unit; 31. Aeration chamber; 321. Air supply device; 322. Aeration pipe; 323. Aerator; 331. 1. Anode plate; 332. Cathode plate; 333. DC power supply; 4. Resin adsorption unit; 41. Third drain pipe; 42. Water inlet chamber; 43. Resin adsorption column; 44. Third water pump; 5. Ultrafiltration unit; 51. Fourth drain pipe; 57. Fifth drain pipe; 53. Ultrafiltration element; 54. Ultrafiltration chamber; 55. Sixth drain pipe; 56. Water storage chamber; 52. Fourth water pump; 58. Fifth water pump; 59. Sixth water pump. Detailed Implementation

[0039] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0040] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that the data in this embodiment are all derived from a comprehensive analysis and evaluation of historical test data and corresponding historical test results from the three months prior to this test. Those skilled in the art will understand that the method described in this invention can determine the above-mentioned parameters in the following ways: selecting the value with the highest proportion based on the data distribution as the preset standard parameter; using weighted summation to obtain the value as the preset standard parameter; substituting each historical data point into a specific formula and using the value obtained by that formula as the preset standard parameter; or other selection methods, as long as the method described in this invention can clearly define different specific situations in the single-item judgment process through the obtained values.

[0042] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively Figure 1 A cross-sectional view of a chemical production wastewater treatment device according to an embodiment of the present invention; a schematic diagram of the module connection of the chemical production wastewater treatment device according to an embodiment of the present invention; a flowchart for determining whether the flocculation and sedimentation treatment of wastewater meets the preset standards according to an embodiment of the present invention; a flowchart for determining whether the aeration and electrolysis of wastewater meets the preset standards according to an embodiment of the present invention.

[0043] This invention provides a chemical production wastewater treatment device, comprising:

[0044] Wastewater pumping unit 1, used to store chemical wastewater to be treated, includes a storage chamber 11, a first drain pipe 12, and a first water pump 13; wherein, one end of the first drain pipe 12 is connected to the storage chamber 11, and the first water pump 13 is provided at the end of the first drain pipe 12 away from the storage chamber 11; the storage chamber 11 is used to store chemical wastewater to be treated.

[0045] Flocculation and sedimentation unit 2, which is connected to the wastewater pumping unit 1, is used to flocculate and precipitate chemical wastewater. It includes a second drain pipe 21, a flocculation chamber 22, a stirrer 23, a flocculant dosing module, and a second water pump 25. The first drain pipe 12 is connected to the first inlet of the flocculation chamber 22 at one end of the first water pump 13. The stirrer 23 is located at the bottom of the flocculation chamber 22. The flocculant dosing module is located at the top of the flocculation chamber 22. The second drain pipe 21 is connected to the sewage outlet of the flocculation chamber 22 at one end. The second water pump 25 is located at the end of the second drain pipe 21 away from the flocculation chamber 22.

[0046] The aeration electrolysis unit 3, which is connected to the flocculation sedimentation unit 2, is used to aerate and electrolyze the wastewater after flocculation and sedimentation. It includes a second inlet, an aeration chamber 31, an aeration module, and an electrolysis module. The second drain pipe 21 is provided with one end of the second water pump 25 connected to the second inlet of the aeration chamber 31. The aeration module includes an air supply device 321, an aeration pipe 322, and an aerator 323. The air supply device 321 and the aerator 323 are connected through the aeration pipe 322.

[0047] The resin adsorption unit 4, connected to the aeration electrolysis unit 3, is used to adsorb impurities from the wastewater after aeration electrolysis. It includes a third drain pipe 41, an inlet chamber 42, and a resin adsorption column 43. One end of the third drain pipe 41 is connected to the aeration chamber 31, and a third water pump 44 is installed at the end of the third drain pipe 41 away from the aeration chamber 31. The end of the third drain pipe 41 with the third water pump 44 is connected to the inlet chamber 42, and the resin adsorption column 43 is installed inside the inlet chamber 42.

[0048] An ultrafiltration unit 5, connected to both the aeration electrolysis unit 3 and the resin adsorption unit 4, is used to ultrafilter the wastewater after aeration electrolysis and the wastewater after impurity adsorption. It includes a fourth drain pipe 51, a fifth drain pipe 57, an ultrafiltration element 53, an ultrafiltration chamber 54, a sixth drain pipe 55, and a water storage chamber 56. The ultrafiltration element 53 is disposed within the ultrafiltration chamber 54. One end of the fourth drain pipe 51 communicates with the aeration chamber 31, and the other end of the fourth drain pipe 51 communicates with the aeration chamber 4. The ultrafiltration chamber 54 is connected to the fourth drain pipe 51, which is equipped with a fourth water pump 52. The fifth drain pipe 57 is connected to the water inlet chamber 42, and the other end of the fifth drain pipe 57 is connected to the ultrafiltration chamber 54. One end of the sixth drain pipe 55 is connected to the ultrafiltration chamber 54, and the other end of the sixth drain pipe 55 is connected to the water storage chamber 56. The fifth drain pipe 57 is equipped with a fifth water pump 58, and the sixth drain pipe 55 is equipped with a sixth water pump 59.

[0049] The detection unit includes a transparency detection module and a dissolved oxygen concentration detection module installed in the flocculation and sedimentation unit 2; and a heavy metal ion content detection module and a colorimetry detection module installed in the aeration and electrolysis unit 3, respectively.

[0050] The process determination unit is connected to the flocculation and sedimentation unit 2, the aeration and electrolysis unit 3, the resin adsorption unit 4, the ultrafiltration unit 5, and the detection unit, respectively. It is used to determine whether the flocculation and sedimentation treatment of the wastewater meets the preset standards based on the transparency of the wastewater and to determine whether the aeration and electrolysis of the wastewater meets the preset standards based on the heavy metal ion content in the wastewater.

[0051] In this embodiment, the transparency detection module is a transparency meter; the dissolved oxygen concentration detection module is a dissolved oxygen meter; the heavy metal ion content detection module is a heavy metal detector; the colorimetry detection module is a wastewater colorimetry detector; the specific structure of the process determination unit is not limited, and the unit itself and its components can be composed of logic components, including field-programmable components, computers, or microprocessors in computers.

[0052] Specifically, the flocculant dispensing module includes an electric valve 241, a connecting pipe 242, and a storage box 243 for storing flocculant. The electric valve 241 is mounted on the connecting pipe 242, and the storage box 243 is connected to the flocculation chamber 22 via the connecting pipe 242.

[0053] Specifically, the electrolysis module includes an anode plate 331, a cathode plate 332, and a DC power supply 333. The anode plate 331 and the cathode plate 332 are disposed inside the aeration chamber 31. The positive and negative terminals of the DC power supply 333 are connected to the anode plate 331 and the cathode plate 332, respectively. The aeration module is disposed between the inner wall of the aeration chamber 31 and the anode plate 331.

[0054] Specifically, the process determination unit determines whether the flocculation and sedimentation treatment of the wastewater meets the preset standard based on the transparency of the wastewater detected by the transparency detection module after the agitator in the flocculation and sedimentation unit has finished stirring.

[0055] If the transparency is less than the first preset transparency of 22cm, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard, and increases the amount of flocculant added in the next batch according to the difference between the first preset transparency and the transparency.

[0056] If the transparency is greater than or equal to the first preset transparency and less than the second preset transparency of 29cm, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard, and increases the stirring rate of the agitator 23 in the next batch according to the difference between the second preset transparency and the transparency.

[0057] If the transparency is greater than or equal to the second preset transparency, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater meets the preset standard, and transports the filtered and sedimented wastewater to the aeration and electrolysis unit 3.

[0058] In this embodiment, the flocculation and sedimentation unit 2 receives 1 ton of wastewater with a preset input amount and performs flocculation and sedimentation treatment on the wastewater at a preset rotation speed of 150 rpm, a preset flocculant dosing rate of 10 kg / h, and a preset flocculant dosing amount of 25 mg / L.

[0059] Specifically, the range of wastewater input is (0.5 tons, 1.5 tons). In this embodiment, the wastewater input is selected as 1 ton, but the above value is not limited to this. Those skilled in the art can also adjust the value according to actual needs.

[0060] In this embodiment, PAC (polyaluminum chloride) is used as a flocculant.

[0061] In this embodiment, the transparency of the wastewater is obtained through a transparency detection module.

[0062] Specifically, transparency directly reflects the removal effect of suspended solids in water after flocculation. The higher the transparency, the larger the flocs formed by flocculation and the more thorough the sedimentation.

[0063] Specifically, the first preset transparency value ranges from (20cm to 25cm), and the second preset transparency value ranges from (26cm to 30cm). In this embodiment, the first preset transparency value is 22cm, and the second preset transparency value is 29cm.

[0064] Specifically, the process determination unit has several rate adjustment methods for increasing the stirring rate of the stirrer 23 in the next batch, wherein,

[0065] If the transparency difference is less than the first preset transparency difference of 3cm, then the stirring speed of the stirrer 23 in the next batch is increased using the first speed adjustment coefficient of 1.02.

[0066] If the transparency difference is greater than or equal to the first preset transparency difference and less than the second preset transparency difference by 5cm, then the mixing speed of the next batch of stirrer 23 is increased using the second rate adjustment coefficient of 1.04.

[0067] If the transparency difference is greater than or equal to the second preset transparency difference, the stirring rate of the next batch of stirrers 23 is increased using the third rate adjustment coefficient of 1.06.

[0068] The transparency difference is the difference between the second preset transparency and the transparency.

[0069] Specifically, the process determination unit, under preset conditions, sets several rate correction methods for correcting the stirring rate of the stirrer 23 in the next batch, wherein,

[0070] If the dissolved oxygen concentration difference is less than the first preset dissolved oxygen concentration difference of 0.4 mg / L, the process determination unit uses the first rate correction coefficient of 0.99 to correct the stirring rate of the stirrer 23 of the next batch to the corresponding value.

[0071] If the dissolved oxygen concentration difference is greater than or equal to the first preset dissolved oxygen concentration difference and less than the second preset dissolved oxygen concentration difference of 0.8 mg / L, the process determination unit uses the second rate correction coefficient of 0.97 to correct the stirring rate of the stirrer 23 of the next batch to the corresponding value.

[0072] If the dissolved oxygen concentration difference is greater than or equal to the second preset dissolved oxygen concentration difference, the process determination unit uses a third rate correction coefficient of 0.95 to correct the stirring rate of the stirrer 23 in the next batch to the corresponding value.

[0073] The preset condition is that after the stirring speed of the stirrer 23 is increased and adjusted, the dissolved oxygen concentration in the flocculation chamber 22 is greater than or equal to the preset dissolved oxygen concentration of 1.8 mg / L.

[0074] In this embodiment, if the dissolved oxygen concentration is too high, i.e., the dissolved oxygen concentration in the flocculation chamber 22 is greater than or equal to the preset dissolved oxygen concentration of 1.8 mg / L, it will lead to Fe2+ + Oxidized to Fe3 + This interferes with the flocculation effect, so the stirring rate needs to be reduced to decrease aeration.

[0075] Specifically, the process determination unit determines whether the wastewater's aeration electrolysis meets preset standards based on the heavy metal ion content detected by the heavy metal ion content detection module after the aeration electrolysis unit completes the aeration electrolysis.

[0076] If the heavy metal ion content is less than the first preset heavy metal ion content of 1.2 mg / L, the process determination unit determines that the aeration electrolysis of the wastewater meets the preset standard, and then transports the wastewater after aeration electrolysis to the ultrafiltration unit 5.

[0077] If the heavy metal ion content is greater than or equal to the first preset heavy metal ion content and less than the second preset heavy metal ion content of 1.5 mg / L, the process determination unit determines that the aeration electrolysis of the wastewater does not meet the preset standard, and makes a second determination on whether the aeration electrolysis of the wastewater meets the preset standard based on the color of the wastewater.

[0078] If the heavy metal ion content is greater than or equal to the second preset heavy metal ion content and less than the third preset heavy metal ion content of 1.9 mg / L, the process determination unit determines that the aeration electrolysis of the wastewater does not meet the preset standard, and increases the electrolysis time according to the difference between the heavy metal ion content and the second preset heavy metal ion content.

[0079] If the heavy metal ion content is greater than or equal to the third preset heavy metal ion content, the process determination unit determines that the aeration electrolysis of the wastewater does not meet the preset standard, and increases the aeration rate according to the difference between the heavy metal ion content and the third preset heavy metal ion content.

[0080] In this embodiment, the aeration electrolysis unit 3 receives the wastewater after flocculation and sedimentation, and aerates it at a preset aeration rate of 1.0 m / s. 3 / (m 3 •min), preset aeration rate 30m 3 / h, preset electrolysis time of 60min, to aerate and electrolyze the wastewater after flocculation and sedimentation.

[0081] In this embodiment, the heavy metal ion content is the total lead ion content.

[0082] In this embodiment, the first preset heavy metal ion content is 1.2 mg / L, which meets the maximum allowable discharge concentration of total lead of 1.0 mg / L in the "Integrated Wastewater Discharge Standard" (GB 8978-1996), leaving a margin of 0.2 mg / L to cope with detection errors.

[0083] Specifically, the process determination unit has several aeration rate adjustment methods for increasing the aeration rate, wherein,

[0084] If the first heavy metal ion difference is less than the first preset heavy metal ion difference of 0.2 mg / L, the process determination unit increases the aeration rate to the corresponding value using the first aeration rate coefficient of 1.01.

[0085] If the first heavy metal ion difference is greater than or equal to the first preset heavy metal ion difference and less than the second preset heavy metal ion difference of 0.6 mg / L, then the process determination unit uses the second aeration rate coefficient of 1.03 to increase the aeration rate to the corresponding value.

[0086] If the first heavy metal ion difference is greater than or equal to the second preset heavy metal ion difference, the process determination unit uses a third aeration rate coefficient of 1.05 to increase the aeration rate to the corresponding value.

[0087] The first heavy metal ion difference is the difference between the heavy metal ion content and the third preset heavy metal ion content.

[0088] Specifically, the increase in the electrolysis time is positively correlated with the difference in the second heavy metal ion content. The positive correlation can be linear or nonlinear. The slope of the linear positive correlation is not specifically limited. It can be understood that the larger the difference in the second heavy metal ion content, the greater the increase in the electrolysis time. The difference in the second heavy metal ion content is the difference between the heavy metal ion content and the second preset heavy metal ion content.

[0089] Specifically, the process determination unit makes a secondary determination based on the color of the wastewater to determine whether the aeration and electrolysis of the wastewater meets the preset standard, wherein...

[0090] If the color intensity is less than the preset color intensity of 13 degrees, the process determination unit will make a secondary determination that the aeration electrolysis of the wastewater meets the preset standard, and then transport the wastewater after aeration electrolysis to the ultrafiltration unit 5.

[0091] If the color is greater than or equal to the preset color, the process determination unit will make a secondary determination that the aeration electrolysis of the wastewater does not meet the preset standard, and will then sequentially transport the wastewater after aeration electrolysis to the resin adsorption unit 4 and the ultrafiltration unit 5.

[0092] In this embodiment, the preset chromaticity value is 13 degrees, referring to the requirement of chromaticity less than or equal to 15 degrees in the "Urban Water Supply Quality Standard" (CJ-T206-2005).

[0093] In this embodiment, color abnormality, i.e., color degree greater than or equal to 13 degrees, indicates that there are unoxidized color-producing organic substances in the wastewater, such as dyes and phenols, which need to be intercepted by resin adsorption.

[0094] Specifically, based on the comparison between the chromaticity and the preset chromaticity, the wastewater treatment path is intelligently switched to avoid unnecessary resin adsorption for low-chromatic wastewater, i.e., chromaticity less than 13 degrees of the preset chromaticity, thus shortening the overall treatment cycle.

[0095] The resin adsorption unit can intercept large molecular pigments and contaminants, reducing the risk of ultrafiltration membrane clogging and decreasing the frequency of cleaning or replacing membrane modules.

[0096] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A chemical production wastewater treatment device, characterized in that, include: Wastewater pumping unit, which is used to store chemical wastewater to be treated; A flocculation and sedimentation unit, which is connected to the wastewater pumping unit, is used to flocculate and precipitate chemical wastewater. An aeration electrolysis unit, which is connected to the flocculation sedimentation unit, is used to aerate and electrolyze the wastewater after flocculation sedimentation. A resin adsorption unit, which is connected to the aeration electrolysis unit, is used to adsorb impurities in the wastewater after aeration electrolysis. An ultrafiltration unit is connected to the aeration electrolysis unit and the resin adsorption unit respectively, and is used to perform ultrafiltration on the wastewater after aeration electrolysis and the wastewater after impurity adsorption. The detection unit includes a transparency detection module installed in the flocculation and sedimentation unit, a dissolved oxygen concentration detection module installed in the flocculation and sedimentation unit, and a heavy metal ion content detection module and a colorimetry detection module installed in the aeration and electrolysis unit, respectively. The process determination unit is connected to the flocculation and sedimentation unit, the aeration and electrolysis unit, the resin adsorption unit, the ultrafiltration unit, and the detection unit, respectively. It is used to adjust the dosage of flocculant in the next batch or the stirring speed of the agitator in the next batch according to the comparison results of the transparency of the wastewater with the corresponding preset transparency. It is also used to increase the electrolysis time according to the comparison results of the heavy metal ion content in the wastewater with the corresponding preset heavy metal ion content. Alternatively, it can transport the wastewater after aeration and electrolysis to the ultrafiltration unit or sequentially to the resin adsorption unit and the ultrafiltration unit according to the color of the wastewater. The process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard if the transparency of the wastewater detected by the transparency detection module is less than the second preset transparency after the agitator of the flocculation and sedimentation unit has finished stirring. The process determination unit increases the amount of flocculant added in the next batch based on the difference between the first preset transparency and the transparency when the transparency is less than the first preset transparency, or increases the stirring speed of the agitator in the next batch of flocculation and sedimentation unit based on the difference between the second preset transparency and the transparency when the transparency is greater than or equal to the first preset transparency and less than the second preset transparency. The process determination unit has several rate adjustment methods for increasing the stirring rate of the agitator in the next batch of flocculation and sedimentation unit, and each rate adjustment method increases the stirring rate by a different amount. The process determination unit has several rate correction methods set for the agitator speed of the agitator in the next batch of flocculation and sedimentation units under preset conditions, and each rate correction method has a different correction range for the agitator speed of the next batch of flocculation and sedimentation units. Excessive dissolved oxygen concentration will lead to Fe²⁺… + Oxidized to Fe³ + It interferes with the flocculation effect; The preset condition is that the dissolved oxygen concentration in the flocculation chamber of the flocculation sedimentation unit is greater than or equal to the preset dissolved oxygen concentration after the stirring speed of the stirrer is increased and adjusted. The flocculant is polyaluminum chloride.

2. The chemical production wastewater treatment device according to claim 1, characterized in that, The process determination unit determines that the wastewater's aeration electrolysis does not meet the preset standard if the heavy metal ion content detected by the heavy metal ion content detection module after the aeration electrolysis unit completes the aeration electrolysis is greater than or equal to the first preset heavy metal ion content.

3. The chemical production wastewater treatment device according to claim 2, characterized in that, The process determination unit, under the condition that the heavy metal ion content is greater than or equal to the first preset heavy metal ion content and less than the second preset heavy metal ion content, makes a secondary determination based on the color of the wastewater to determine whether the aeration electrolysis of the wastewater meets the preset standard. The process determination unit increases the electrolysis time under the condition that the heavy metal ion content is greater than or equal to the second preset heavy metal ion content and less than the third preset heavy metal ion content. The process determination unit also increases the aeration rate under the condition that the heavy metal ion content is greater than or equal to the third preset heavy metal ion content.

4. The chemical production wastewater treatment device according to claim 3, characterized in that, The process determination unit has several aeration rate adjustment methods for increasing the aeration rate, and each aeration rate adjustment method increases the aeration rate by a different amount.

5. The chemical production wastewater treatment device according to claim 4, characterized in that, The increase in the electrolysis time is positively correlated with the difference in the second heavy metal ion content, wherein the difference in the second heavy metal ion content is the difference between the heavy metal ion content and the second preset heavy metal ion content.

6. The chemical production wastewater treatment device according to claim 5, characterized in that, The process determination unit makes a secondary determination based on the color of the wastewater to determine whether the aeration and electrolysis of the wastewater meets the preset standard. If the color intensity is less than the preset color intensity, the process determination unit will make a second determination that the aeration electrolysis of the wastewater meets the preset standard, and then transport the wastewater after aeration electrolysis to the ultrafiltration unit. If the color intensity is greater than or equal to the preset color intensity, the process determination unit will make a secondary determination that the aeration electrolysis of the wastewater does not meet the preset standard, and will then sequentially transport the wastewater after aeration electrolysis to the resin adsorption unit and the ultrafiltration unit.

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