Chemical production wastewater treatment device

Abstract

The invention relates to the technical field of wastewater treatment equipment, in particular to a chemical industry production wastewater treatment device which comprises a wastewater pumping unit; comprising a stirrer and a flocculation cavity; comprising a second water inlet, an aeration cavity, an aeration module and an electrolysis module; comprising a third drainage pipe, a water inlet cavity and a resin adsorption column; comprising a transparency detection module arranged on a flocculent precipitation unit and a dissolved oxygen concentration detection module arranged on the flocculent precipitation unit, the detection units are respectively arranged on a heavy metal ion content detection module and a chromaticity detection module of the aeration electrolysis unit; and the process determination unit is used for judging whether the flocculation precipitation treatment of the wastewater meets a preset standard or not according to the transparency of the wastewater and judging whether the aeration electrolysis of the wastewater meets the preset standard or not according to the content of heavy metal ions in the wastewater. The chemical wastewater treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment equipment, and particularly relates to a chemical production wastewater treatment device. Background Art

[0002] Printing and dyeing wastewater and heavy metal wastewater in chemical wastewater are two important treatment targets, which pose significant hazards to the environment and human health;

[0003] Printing and dyeing wastewater refers to the wastewater generated during the printing and dyeing process of textiles. It contains a large amount of organic pollutants, chromaticity, and some heavy metals. If these wastewaters are directly discharged without treatment, they will cause serious pollution to the environment. The color of printing and dyeing wastewater is deep, seriously affecting the appearance of the receiving water body. The colored water body will also affect the transmission of sunlight, which is not conducive to the growth of aquatic organisms. In addition, it is difficult to remove the chromaticity of printing and dyeing wastewater by general biochemical methods;

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

[0005] Chinese Patent Application Publication No.: CN105585222A, discloses a chemical wastewater treatment device, including a pretreatment device, which is sequentially connected to a primary enhanced treatment device, a secondary enhanced treatment device, and a clean water storage tank; the pretreatment device includes a water inlet pipe and a collection tank, and a rotary grille is arranged at the water inlet of the collection tank; the primary enhanced treatment device includes a coagulation sedimentation tank, an adjustment tank, an anaerobic tank, and an aerobic tank connected in sequence, and a stirring device and an aeration device are arranged in the aerobic tank; the secondary enhanced treatment device includes a secondary sedimentation tank, a disinfection tank, and a filtration device connected in sequence, and a dosing device is arranged on the water outlet pipe of the secondary sedimentation tank, and the dosing device includes a base and a medicine storage tank, and a dosing control device is arranged on the medicine storage tank; the chemical wastewater treatment device also includes a sludge treatment device and an effluent monitoring device. It can be seen that in the above technical solution, the influence of the change in the transparency of chemical wastewater on the treatment effect of wastewater pollutants is not considered, and the subsequent wastewater treatment process cannot be changed according to the different chromaticities of the wastewater, resulting in the problem of low chemical wastewater treatment efficiency. Summary of the Invention

[0006] To this end, the present invention provides a chemical production wastewater treatment device to overcome the problem that the prior art does not consider the impact of changes in transparency in chemical wastewater on the treatment effect of wastewater pollutants and cannot change the subsequent wastewater treatment process according to the different chromaticity of the wastewater, thereby resulting in low chemical wastewater treatment efficiency.

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

[0008] A wastewater pumping unit for storing chemical wastewater to be treated;

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

[0010] an aeration electrolysis unit, which is connected to the flocculation and sedimentation unit and is used to perform aeration electrolysis on the wastewater after flocculation and sedimentation;

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

[0012] An ultrafiltration unit, which is connected to the aeration electrolysis unit and the resin adsorption unit respectively, and is used to ultrafilter the wastewater after aeration electrolysis and the wastewater after impurity adsorption;

[0013] A detection unit, comprising a transparency detection module arranged in the flocculation and sedimentation unit, a dissolved oxygen concentration detection module arranged in the flocculation and sedimentation unit, and a heavy metal ion content detection module and a chromaticity detection module respectively arranged in the aeration and electrolysis unit;

[0014] A process determination unit is respectively connected to the flocculation sedimentation unit, the aeration electrolysis unit, the resin adsorption unit, the ultrafiltration unit and the detection unit, and is used for adjusting the amount of flocculant added in the next batch or adjusting the stirring rate of the agitator in the next batch according to the comparison results of the transparency of the wastewater with the corresponding preset transparency, and for increasing 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, or, according to the chromaticity of the wastewater, conveying the wastewater after aeration electrolysis to the ultrafiltration unit or conveying it to the resin adsorption unit and the ultrafiltration unit in sequence.

[0015] Furthermore, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard according to the transparency of the wastewater detected by the transparency detection module after the agitator of the flocculation and sedimentation unit completes stirring being less than a second preset transparency.

[0016] Further, under the condition that the transparency is less than the first preset transparency, the process determination unit increases the dosage of the flocculant for the next batch according to the difference between the first preset transparency and the transparency, or under the condition that the transparency is greater than or equal to the first preset transparency and less than the second preset transparency, increases the stirring rate of the stirrer of the flocculation precipitation unit for the next batch according to the difference between the second preset transparency and the transparency.

[0017] Further, the process determination unit has several rate adjustment methods for increasing the stirring rate of the stirrer of the flocculation precipitation unit for the next batch, and each rate adjustment method has a different increase amplitude for the stirring rate.

[0018] Further, under preset conditions, the process determination unit has several rate correction methods for correcting the stirring rate of the stirrer of the flocculation precipitation unit for the next batch, and each rate correction method has a different correction amplitude for the stirring rate of the stirrer of the flocculation precipitation unit for the next batch;

[0019] The preset condition is that the dissolved oxygen concentration in the flocculation cavity of the flocculation precipitation unit is greater than or equal to the preset dissolved oxygen concentration after the increase adjustment of the stirring rate of the stirrer is completed.

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

[0021] Further, 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, the process determination unit re-determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity 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 duration. And 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] Further, the process determination unit has several aeration rate adjustment methods for increasing the aeration rate, and each aeration rate adjustment method has a different increase amplitude for the aeration rate.

[0023] Further, the increase amplitude of the electrolysis duration is positively correlated with the second heavy metal ion difference, where the second heavy metal ion difference is the difference between the heavy metal ion content and the second preset heavy metal ion content.

[0024] Further, the process determination unit secondarily determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity of the wastewater, where

[0025] If the chromaticity is less than the preset chromaticity, the process determination unit secondarily determines that the aeration electrolysis of the wastewater meets the preset standard and conveys the wastewater after aeration electrolysis to the ultrafiltration unit;

[0026] If the chromaticity is greater than or equal to the preset chromaticity, the process determination unit secondarily determines that the aeration electrolysis of the wastewater does not meet the preset standard and conveys the wastewater after aeration electrolysis to the resin adsorption unit and the ultrafiltration unit in sequence.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows. By adding a flocculant and stirring, suspended solids, organic substances, etc. in the wastewater form flocs and precipitate; the effect of flocculation precipitation treatment is verified through the transparency of the wastewater; the wastewater is subjected to aeration and electrolysis treatment to remove heavy metal ions in the wastewater; by verifying the content of heavy metal ions in the wastewater, it is determined whether the aeration electrolysis treatment of the wastewater meets the preset standard and corresponding adjustments are made according to the determination result; the wastewater treatment process is adjusted in real time through chromaticity, and organic substances, heavy metal ions and other trace impurities in the wastewater are efficiently adsorbed, thereby improving the treatment efficiency of chemical industrial wastewater.

[0028] Further, the present invention is provided with a flocculation precipitation unit and an aeration electrolysis unit. The flocculation precipitation unit is mainly responsible for removing suspended solids, colloids and some dissolved organic substances in the wastewater, and the aeration electrolysis unit is mainly responsible for removing heavy metal ions and other harmful substances in the wastewater; first, the flocculation precipitation unit removes impurities such as suspended solids and colloids in the wastewater to provide relatively clear wastewater for subsequent treatment; then, the aeration electrolysis unit further removes heavy metal ions and other harmful substances in the wastewater, thereby effectively purifying the wastewater.

[0029] Further, the present invention is provided with a resin adsorption unit for further removing dissolved organic substances and heavy metal ions in the wastewater, thereby realizing the deep purification of the wastewater.

[0030] Further, the present invention is provided with an ultrafiltration unit. After ultrafiltration treatment, the purification quality of the wastewater is improved, thereby reducing environmental pollution.

[0031] Further, the present invention determines whether the flocculation precipitation treatment of the wastewater meets the preset standard according to the transparency of the wastewater. The transparency of the wastewater reflects the content of impurities such as suspended solids, colloids and dissolved organic substances in the wastewater, monitors the treatment of chemical industrial wastewater in real time and makes intelligent adjustments, thereby improving the automation level of wastewater treatment.

[0032] Further, the present invention determines whether the aeration electrolysis of the wastewater meets the preset standard according to the heavy metal ion content in the wastewater, making the evaluation more accurate, thereby increasing the reliability of the evaluation.

[0033] Further, the present invention secondarily determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity of the wastewater, and selects to perform ultrafiltration on the wastewater or perform resin adsorption on the wastewater and then perform ultrafiltration according to the determination result, flexibly selecting the wastewater treatment process, thereby improving the wastewater treatment efficiency. Description of the Drawings

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

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

[0036] Figure 3 It is a flowchart for determining whether the flocculation precipitation treatment of the wastewater meets the preset standard according to the embodiment of the present invention;

[0037] Figure 4 It is a flowchart for determining whether the aeration electrolysis of the wastewater meets the preset standard according to the embodiment of the present invention;

[0038] In the figure, 1. Wastewater pumping unit; 11. Storage chamber; 12. First drain pipe; 13. First water pump; 2. Flocculation precipitation unit; 21. Second drain pipe; 22. Flocculation chamber; 23. Stirrer; 241. Electric valve; 242. Connecting pipe; 243. Storage box; 25. Second water pump; 3. Aeration electrolysis unit; 31. Aeration chamber; 321. Gas supply device; 322. Aeration pipe; 323. Aerator; 331. Anode plate; 332. Cathode plate; 333. DC power supply; 4. Resin adsorption unit; 41. Third drain pipe; 42. Inlet chamber; 43. Resin adsorption column; 44. Third water pump; 5. Ultrafiltration unit; 51. Fourth drain pipe; 57. Fifth drain pipe; 53. Ultrafilter 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 Embodiments

[0039] In order to make the objectives and advantages of the present invention more clear, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0041] It should be noted that the data in this embodiment are comprehensively analyzed and evaluated from the historical detection data and corresponding historical detection results of the present invention in the three months before this detection. Those skilled in the art can understand that the method for determining a single above-mentioned parameter in the present invention can be to select the value with the highest proportion according to the data distribution as the preset standard parameter, use weighted summation to take the obtained value as the preset standard parameter, substitute each historical data into a specific formula and take the value obtained by using this formula as the preset standard parameter, or other selection methods, as long as it satisfies that the method of the present invention can clearly define different specific situations in the single-item determination process through the obtained value.

[0042] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 as shown, which are respectively Figure 1 a cross-sectional view of the chemical production wastewater treatment device according to the embodiment of the present invention; a schematic diagram of the module connection of the chemical production wastewater treatment device according to the embodiment of the present invention; a flowchart for determining whether the flocculation and precipitation treatment of wastewater meets the preset standard according to the embodiment of the present invention; a flowchart for determining whether the aeration electrolysis of wastewater meets the preset standard according to the embodiment of the present invention.

[0043] The embodiment of the present invention provides a chemical production wastewater treatment device, including:

[0044] A wastewater pumping unit 1, which is used to store the chemical wastewater to be treated, including a storage cavity 11, a first drain pipe 12 and a first water pump 13; wherein, one end of the first drain pipe 12 communicates with the storage cavity 11, and the first water pump 13 is arranged at the end of the first drain pipe 12 far from the storage cavity 11; the storage cavity 11 is used to store the chemical wastewater to be treated;

[0045] A flocculation and precipitation unit 2, which is connected to the wastewater pumping unit 1 and is used to perform flocculation and precipitation on the chemical wastewater, including a second drain pipe 21, a flocculation cavity 22, a stirrer 23, a flocculant dosing module and a second water pump 25; wherein, the end of the first drain pipe 12 provided with the first water pump 13 communicates with the first water inlet of the flocculation cavity 22, a stirrer 23 is arranged at the bottom of the flocculation cavity 22, the flocculant dosing module is arranged at the top of the flocculation cavity 22, one end of the second drain pipe 21 communicates with the sewage outlet of the flocculation cavity 22, and the second water pump 25 is arranged at the end of the second drain pipe 21 far from the flocculation cavity 22;

[0046] An aeration electrolysis unit 3, which is connected to the flocculation precipitation unit 2 and is used for aeration electrolysis of the wastewater after flocculation precipitation, includes a second water inlet, an aeration chamber 31, an aeration module and an electrolysis module; wherein, one end of the second drain pipe 21 provided with the second water pump 25 communicates with the second water inlet of the aeration chamber 31, the aeration module includes an air supply device 321, an aeration pipe 322 and an aerator 323, and the air supply device 321 and the aerator 323 are connected through the aeration pipe 322;

[0047] A resin adsorption unit 4, which is connected to the aeration electrolysis unit 3 and is used for impurity adsorption of the wastewater after aeration electrolysis, includes a third drain pipe 41, a water inlet chamber 42 and a resin adsorption column 43; wherein, one end of the third drain pipe 41 communicates with the aeration chamber 31, a third water pump 44 is arranged at the end of the third drain pipe 41 far away from the aeration chamber 31, one end of the third drain pipe 41 provided with the third water pump 44 communicates with the water inlet chamber 42, and the resin adsorption column 43 is arranged in the water inlet chamber 42;

[0048] A ultrafiltration unit 5, which is respectively connected to the aeration electrolysis unit 3 and the resin adsorption unit 4 and is used for ultrafiltration of the wastewater after aeration electrolysis and the wastewater after impurity adsorption, includes a fourth drain pipe 51, a fifth drain pipe 57, a ultrafilter element 53, a ultrafiltration chamber 54, a sixth drain pipe 55 and a water storage chamber 56; wherein, the ultrafilter element 53 is arranged in the ultrafiltration chamber 54, one end of the fourth drain pipe 51 communicates with the aeration chamber 31, the other end of the fourth drain pipe 51 communicates with the ultrafiltration chamber 54, a fourth water pump 52 is arranged on the fourth drain pipe 51, the fifth drain pipe 57 communicates with the water inlet chamber 42, the other end of the fifth drain pipe 57 communicates with the ultrafiltration chamber 54, one end of the sixth drain pipe 55 communicates with the ultrafiltration chamber 54, the other end of the sixth drain pipe 55 communicates with the water storage chamber 56, a fifth water pump 58 is arranged on the fifth drain pipe 57, and a sixth water pump 59 is arranged on the sixth drain pipe 55;

[0049] A detection unit, which includes a transparency detection module arranged in the flocculation precipitation unit 2 and a dissolved oxygen concentration detection module arranged in the flocculation precipitation unit 2; a heavy metal ion content detection module and a chromaticity detection module respectively arranged in the aeration electrolysis unit 3;

[0050] A process determination unit, which is respectively connected to the flocculation precipitation unit 2, the aeration electrolysis unit 3, the resin adsorption unit 4, the ultrafiltration unit 5 and the detection unit, and is used for determining whether the flocculation precipitation treatment of the wastewater meets the preset standard according to the transparency of the wastewater and for determining whether the aeration electrolysis of the wastewater meets the preset standard according to 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 chromaticity detection module is a wastewater chromaticity detector; the specific structure of the process determination unit is not limited, and it and each unit therein can be composed of logic components, and the logic components include field programmable components, computers or microprocessors in the computer.

[0052] Specifically, the flocculant dosing module includes an electric valve 241, a connecting pipe 242, and a storage tank 243 for storing the flocculant. Among them, the electric valve 241 is arranged on the connecting pipe 242, and the storage tank 243 is connected to the flocculation chamber 22 through 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 arranged in the aeration chamber 31. The positive and negative poles of the DC power supply 333 are respectively connected to the anode plate 331 and the cathode plate 332, and the aeration module is arranged 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 according to the transparency of the wastewater detected by the transparency detection module after the stirrer in the flocculation and sedimentation unit finishes stirring. Among them,

[0055] If the transparency is less than the first preset transparency of 22 cm, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard, and increases the dosing amount of the flocculant for 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 29 cm, the process determination unit determines that the flocculation and sedimentation treatment of the wastewater does not meet the preset standard, and increases the stirring speed of the stirrer 23 for 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 conveys 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 input amount of the wastewater ranges from (0.5 tons, 1.5 tons). In this embodiment, the input amount of the wastewater is selected as 1 ton. However, the above values are not limited to this, and those skilled in the art can also adjust the values according to actual needs.

[0060] In this embodiment, PAC (poly aluminum chloride) is used as the flocculant.

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

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

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

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

[0065] If the transparency difference is less than the first preset transparency difference of 3 cm, the first rate adjustment coefficient 1.02 is used to increase the stirring rate of the stirrer 23 in the next batch;

[0066] If the transparency difference is greater than or equal to the first preset transparency difference and less than the second preset transparency difference of 5 cm, the second rate adjustment coefficient 1.04 is used to increase the stirring rate of the stirrer 23 in the next batch;

[0067] If the transparency difference is greater than or equal to the second preset transparency difference, the third rate adjustment coefficient 1.06 is used to increase the stirring rate of the stirrer 23 in the next batch;

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

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

[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 0.99 to correct the stirring rate of the stirrer 23 in the next batch to the corresponding value;

[0071] If the difference in dissolved oxygen concentration 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 in the next batch to the corresponding value;

[0072] If the difference in dissolved oxygen concentration is greater than or equal to the second preset dissolved oxygen concentration difference, the process determination unit uses the 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 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 after the stirring rate of the stirrer 23 has completed the increase adjustment.

[0074] In this embodiment, when the dissolved oxygen concentration is too high, that is, when 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 cause Fe2 + to be oxidized to Fe3 + , interfering with the flocculation effect, and it is necessary to reduce the stirring rate to reduce aeration.

[0075] Specifically, the process determination unit determines whether the aeration electrolysis of the wastewater meets the preset standard according to the heavy metal ion content in the wastewater detected by the heavy metal ion content detection module after the aeration electrolysis unit has completed aeration electrolysis. Among them,

[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 conveys 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 re-determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity 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 duration 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 performs aeration electrolysis treatment on the wastewater after flocculation and sedimentation at a preset aeration rate of 1.0 m 3 / (m 3 ·min), a preset aeration volume of 30 m 3 / h, and a preset electrolysis duration of 60 min.

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

[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), with 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 the increase of the aeration rate. Among them,

[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 uses the first aeration rate coefficient 1.01 to increase the aeration rate to the corresponding value;

[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, the process determination unit uses the second aeration rate coefficient 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 the third aeration rate coefficient 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 amplitude of the electrolysis duration is positively correlated with the second heavy metal ion difference. Among them, the positive correlation is, for example, linear positive correlation or non-linear positive correlation. The linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the second heavy metal ion difference, the greater the increase amplitude of the electrolysis duration; the second heavy metal ion difference is the difference between the heavy metal ion content and the second preset heavy metal ion content.

[0089] Specifically, the process determination unit secondarily determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity of the wastewater. Among them,

[0090] If the chromaticity is less than the preset chromaticity of 13 degrees, the process determination unit re-determines that the aeration electrolysis of the wastewater meets the preset standard, and conveys the wastewater after aeration electrolysis to the ultrafiltration unit 5;

[0091] If the chromaticity is greater than or equal to the preset chromaticity, the process determination unit re-determines that the aeration electrolysis of the wastewater does not meet the preset standard, and conveys the wastewater after aeration electrolysis to the resin adsorption unit 4 and the ultrafiltration unit 5 in sequence.

[0092] In this embodiment, the preset chromaticity value is 13 degrees, referring to the requirement in the "Urban Water Supply Quality Standard" (CJ-T 206-2005) that the chromaticity is less than or equal to 15 degrees.

[0093] In this embodiment, abnormal chromaticity, that is, the chromaticity is greater than or equal to 13 degrees, indicates that there are unoxidized chromogenic organic substances such as dyes and phenols in the wastewater, which need to be intercepted by resin adsorption.

[0094] Specifically, according to the comparison between the chromaticity and the preset chromaticity, the intelligent switching of the wastewater treatment path is realized, avoiding unnecessary resin adsorption for wastewater with low chromaticity, that is, the chromaticity is less than the preset chromaticity of 13 degrees, and shortening the overall treatment cycle;

[0095] The resin adsorption unit can intercept macromolecular pigments and pollutants, reduce the risk of blocking the ultrafiltration membrane, and reduce the frequency of cleaning or replacing the membrane module.

[0096] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 protection scope of the present invention.

[0097] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A chemical production wastewater treatment device, characterized in that, Comprising: A wastewater pumping unit for storing chemical wastewater to be treated; A flocculation precipitation unit connected to the wastewater pumping unit for flocculating and precipitating chemical wastewater; An aeration electrolysis unit connected to the flocculation precipitation unit for aerating and electrolyzing the wastewater after flocculation and precipitation; A resin adsorption unit connected to the aeration electrolysis unit for adsorbing impurities in the wastewater after aeration and electrolysis; An ultrafiltration unit connected to the aeration electrolysis unit and the resin adsorption unit respectively for ultrafiltering the wastewater after aeration and electrolysis and the wastewater after impurity adsorption; A detection unit including a transparency detection module disposed in the flocculation precipitation unit, a dissolved oxygen concentration detection module disposed in the flocculation precipitation unit, a heavy metal ion content detection module and a chromaticity detection module respectively disposed in the aeration electrolysis unit; A process determination unit connected to the flocculation precipitation unit, the aeration electrolysis unit, the resin adsorption unit, the ultrafiltration unit and the detection unit respectively for adjusting the flocculant dosage of the next batch or adjusting the stirring rate of the stirrer of the next batch according to the comparison result of the transparency of the wastewater with the corresponding preset transparency, and for increasing the electrolysis duration according to the comparison result of the heavy metal ion content in the wastewater with the corresponding preset heavy metal ion content, or for delivering the wastewater after aeration and electrolysis to the ultrafiltration unit or sequentially delivering it to the resin adsorption unit and the ultrafiltration unit according to the chromaticity of the wastewater.

2. The chemical production wastewater treatment device according to claim 1, characterized in that, The process determination unit determines that the flocculation and precipitation treatment of the wastewater does not meet the preset standard based on the fact that the transparency of the wastewater detected by the transparency detection module after the stirrer of the flocculation precipitation unit finishes stirring is less than the second preset transparency.

3. The chemical production wastewater treatment device according to claim 2, characterized in that, The process determination unit increases the flocculant dosage of the next batch according to the difference between the first preset transparency and the transparency under the condition that the transparency is less than the first preset transparency, or increases the stirring rate of the stirrer of the flocculation precipitation unit of the next batch according to the difference between the second preset transparency and the transparency under the condition that the transparency is greater than or equal to the first preset transparency and less than the second preset transparency.

4. The chemical production wastewater treatment device according to claim 3, characterized in that, The process determination unit has several rate adjustment methods for increasing the stirring rate of the stirrer of the flocculation precipitation unit of the next batch, and each rate adjustment method has a different increase range for the stirring rate.

5. The chemical production wastewater treatment device according to claim 4, characterized in that, The process determination unit has several rate correction methods for correcting the stirring rate of the stirrer of the flocculation precipitation unit of the next batch under preset conditions, and each rate correction method has a different correction range for the stirring rate of the stirrer of the flocculation precipitation unit of the next batch; The preset condition is that the dissolved oxygen concentration in the flocculation chamber of the flocculation precipitation unit is greater than or equal to the preset dissolved oxygen concentration after the increase adjustment of the stirring rate of the stirrer is completed.

6. The chemical production wastewater treatment device according to claim 5, characterized in that, The process determination unit determines that the aeration electrolysis of the wastewater does not meet the preset standard based on the fact that the heavy metal ion content in the wastewater detected by the heavy metal ion content detection module after the aeration electrolysis unit finishes aeration and electrolysis is greater than or equal to the first preset heavy metal ion content.

7. The chemical production wastewater treatment device according to claim 6, wherein The process determination unit re-determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity of the wastewater 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. The process determination unit increases the electrolysis duration 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. Moreover, the process determination unit 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.

8. The chemical production wastewater treatment device according to claim 7, characterized in that, The process determination unit is provided with several aeration rate adjustment methods for increasing the aeration rate, and each aeration rate adjustment method has a different increase amplitude for the aeration rate.

9. The chemical production wastewater treatment device according to claim 8, characterized in that The increase amplitude of the electrolysis duration is positively correlated with the second heavy metal ion difference, where the second heavy metal ion difference is the difference between the heavy metal ion content and the second preset heavy metal ion content.

10. The chemical production wastewater treatment device according to claim 9, characterized in that, The process determination unit re-determines whether the aeration electrolysis of the wastewater meets the preset standard according to the chromaticity of the wastewater, where if the chromaticity is less than the preset chromaticity, the process determination unit re-determines that the aeration electrolysis of the wastewater meets the preset standard and conveys the wastewater after aeration electrolysis to the ultrafiltration unit; if the chromaticity is greater than or equal to the preset chromaticity, the process determination unit re-determines that the aeration electrolysis of the wastewater does not meet the preset standard and conveys the wastewater after aeration electrolysis to the resin adsorption unit and the ultrafiltration unit in sequence.

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