A process for treating waste water from a flaw detection

Abstract

The present application relates to wastewater treatment technical field, especially, it is a kind of flaw detection wastewater treatment process, comprising: the process is based on flaw detection wastewater integrated treatment equipment is realized, the integrated treatment equipment includes the communication of mixed tank, dosing system, sedimentation tank, reaction tank, filter tank, sludge treatment equipment in proper order.By "pretreatment-sedimentation-oxidation-filtration-sludge treatment" whole process collaborative design, can efficiently remove the fluorescence material in flaw detection wastewater, refractory organic matter, solid impurities and a small amount of heavy metal ions, wherein COD removal rate is ≥94%, fluorescence material removal rate is ≥98%, effluent pH value is stable at 6.5-7.5, fully comply with national flaw detection wastewater discharge and reuse standard, effectively solve the problem of poor treatment effect of prior art, effluent is difficult to reach standard.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment process for flaw detection. Background Technology

[0002] Penetrant testing is widely used in industries such as aviation, aerospace, and special equipment, primarily for non-destructive testing of precision parts. This process generates a large amount of wastewater. This wastewater contains various components such as kerosene, fluorescent dyes, fluorescent whitening agents, and surfactants. It is a yellow-green emulsion with an oil film floating on the surface. It is characterized by high COD (up to 5000-6000 mg / L), high oil content, high organic matter concentration, strong biotoxicity, poor biodegradability, high salinity, and difficulty in demulsification. Furthermore, the fluorescent whitening agents and other components it contains pose a potential carcinogenic risk, posing a significant threat to the environment and human health.

[0003] Currently, existing technologies for treating flaw detection wastewater mainly include physical adsorption, chemical oxidation, biological treatment, and combined processes. However, they generally have many shortcomings: physical adsorption can only adsorb some fluorescent substances, resulting in limited treatment effects. Furthermore, the adsorbent is easily saturated and requires frequent replacement, leading to high treatment costs. Single chemical oxidation methods consume large amounts of oxidant, have harsh reaction conditions, are prone to secondary pollution, and are difficult to completely degrade recalcitrant fluorescent substances. Biological treatment methods have high requirements for wastewater quality, and fluorescent substances and residual agents can inhibit microbial activity, resulting in low treatment efficiency, difficulty in meeting effluent standards, and an inability to achieve efficient removal of fluorescent substances and recalcitrant organic matter while simultaneously treating sludge harmlessly. Therefore, in order to address the shortcomings of existing technologies, we need to develop an integrated process that is simple in procedure, has stable treatment effect, controllable cost, and can achieve both the standard discharge of flaw detection wastewater and the harmless treatment of sludge, in order to solve the above-mentioned technical problems. Summary of the Invention

[0004] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and other accompanying drawings.

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a wastewater treatment process for flaw detection to solve the existing problems.

[0006] To achieve the above objectives, the technical solution of the present invention is: a wastewater treatment process for flaw detection, comprising: the process being implemented based on an integrated wastewater treatment device for flaw detection, the integrated treatment device comprising, in sequence, a mixing tank, a dosing system, a sedimentation tank, a reaction tank, a filter tank, and a sludge treatment device, the process comprising: S1. Wastewater collection and pretreatment: The flaw detection wastewater is introduced into the mixing tank. The stirring component of the mixing tank is started to stir at a uniform speed to make the wastewater evenly mixed. The wastewater level is monitored. The mixing tank is equipped with a pH monitoring device to adjust the pH value of the wastewater to 6.5-7.5 in real time. The stirring speed is 60-80 r / min and the stirring time is 10-15 min. S2. Sedimentation Treatment: Coagulant and flocculant are quantitatively added to the tank through the dosing system. The mixture is then pumped into the mixing tank by the metering pump of the dosing system and stirred. After stirring, the mixed water is transported to the sedimentation tank through the inlet pipe of the sedimentation tank. The coagulant used is polyaluminum chloride (PAC), with a dosage of 80-120 mg / L. The flocculant used is polyacrylamide (PAM), with a dosage of 5-10 mg / L. The staged stirring mode is as follows: first stir at 120-150 r / min for 3-5 min, and then stir at 40-60 r / min for 10-15 min. S3. Sedimentation and Sludge Treatment: After the wastewater enters the sedimentation tank, solid-liquid separation is performed. The supernatant is then transferred to the reaction tank. The bottom of the sedimentation tank is funnel-shaped, and the sludge is transferred to the sludge pretreatment tank through the bottom sludge discharge pipe. Sludge conditioner is added for pretreatment. The sludge is then collected as hazardous waste, and the filtrate is returned to the mixing tank for secondary treatment. The sludge conditioner added to the sludge treatment equipment is a compound conditioner of polyferric sulfate and diatomaceous earth with a mass ratio of 3:1 and a dosage of 5-8% of the dry weight of the sludge. S4. Oxidation Treatment: Add an oxidizing agent to the supernatant and stir to allow the agent to fully react with the wastewater, achieving the oxidative decomposition of recalcitrant organic matter. The content of fluorescent substances is then monitored in real time using an online fluorescence intensity monitor. The oxidizing agent selected is one of Fenton's reagent, an ozone-hydrogen peroxide synergistic agent, or a photocatalytic oxidizing agent. If Fenton's reagent is selected, Fe... 2+ The dosage is 50-80 mg / L, the H2O2 dosage is 200-300 mg / L, the stirring speed is 80-100 r / min, the stirring time is 40-50 min, the water temperature in the reaction vessel is controlled at 25-35℃, the pH value is controlled at 2.5-3.5, the monitoring wavelength of the online fluorescence intensity monitor is 365-420 nm, the detection accuracy is ≤0.01 mg / L, and the detection response time is ≤10 s; S5. Filtration Treatment: The wastewater after oxidation treatment enters the filter tank for adsorption of organic matter and filtration of impurities. The filter tank is filtered by activated carbon and quartz sand. The wastewater first passes through the second filter screen at the top and bottom of the filter tank for two-stage interception to remove large particles of impurities. Then it enters the permeable pipe and permeates evenly through the through holes on the surface of the permeable pipe, making full contact with the activated carbon and quartz sand filled in the pipe. The activated carbon adsorbs residual organic matter and the quartz sand filters fine suspended impurities to achieve deep purification. The pore size of the second filter screen, the pore size of the permeable pipe, and the particle size of the activated carbon and quartz sand are matched to ensure smooth filtration and stable effect. S6. Effluent Testing and Discharge / Reuse: Before discharge, test the effluent indicators. If they meet the standards, discharge or disinfect and reuse or introduce them into the storage tank for repeated use. If they do not meet the standards, return them to the mixing tank for reprocessing.

[0007] In some embodiments, in step S2, the dosing system controls the pre-added tap water or treated water to be introduced into the dosing tank of the dosing system via a control cabinet, and then the medicine is poured into the medicine tank for stirring, and then quantitatively delivered by a metering pump connected to the mixing tank.

[0008] In some embodiments, in step S3, a circular pipe is installed in the middle of the top of the sedimentation tank, and water is discharged through the inlet of the inlet pipe into the circular pipe. A supernatant carrying area is set around the inside of the top of the sedimentation tank, and then a water pipe is connected to the reaction tank in the carrying area. Then, a first filter screen that can cover the top of the sedimentation tank is installed on the outer wall of the circular pipe for blocking. After continuous water discharge, sedimentation occurs, and the solid impurities that are precipitated will settle at the bottom of the sedimentation tank, while the supernatant will overflow into the carrying area along the edge of the carrying area. Impurities that cannot be precipitated will be blocked by the filter screen. Then, a water pump connected by a water pipe will introduce the supernatant into the reaction tank for reaction. When the sediment reaches the set discharge threshold, the sediment is discharged into the sludge treatment equipment for treatment through the bottom drain pipe.

[0009] In some embodiments, in step S1, the drive motor at the top of the mixing tank drives the stirring frame, support rod and stirring rod to operate synchronously. The stirring holes on the stirring rod and the support rod are used to perform multi-dimensional dispersion and stirring of the flaw detection wastewater, so that the wastewater is fully homogeneously mixed in the tank, effectively breaking the water stratification phenomenon, ensuring that the wastewater concentration and pH value are uniform, and improving the stability and treatment effect of the subsequent coagulation reaction.

[0010] In some embodiments, in step S4, a temperature-controlled medium is introduced through a circulating pipe surrounding the outer wall of the reaction tank. The medium flows in from the inlet end of the pipe and flows out from the outlet end, forming a circulating temperature-controlled loop. This stabilizes the water temperature inside the reaction tank at 25-35°C, and, in conjunction with pH adjustment within the tank, ensures that the oxidizing agent is always under optimal reaction conditions, guaranteeing the efficient decomposition of recalcitrant organic matter and fluorescent substances.

[0011] In some embodiments, in step S5, the filtration section is auxiliaryly heated by the heating pipe in the hollow area of ​​the side wall of the filter tank, which increases the permeation rate of wastewater in the filter medium, reduces the adsorption and agglomeration of impurities on the surface of the filter media, avoids clogging of the filter channel, and, in conjunction with the backwashing process, maintains the long-term stable operation of the filter unit and extends the service life of the filter medium.

[0012] By adopting the above technical solution, the beneficial effects of the present invention are: 1. This process, through a synergistic design of the entire process of "pretreatment-sedimentation-oxidation-filtration-sludge treatment", can efficiently remove fluorescent substances, recalcitrant organic matter, solid impurities and trace heavy metal ions from flaw detection wastewater. The COD removal rate is ≥94%, the fluorescent substance removal rate is ≥98%, and the effluent pH value is stable between 6.5 and 7.5, which fully complies with the national standards for flaw detection wastewater discharge and reuse. It effectively solves the problems of poor treatment effect and difficulty in meeting the standards of existing technologies.

[0013] 2. The process is based on integrated equipment, with each processing unit connected in sequence. The structure is compact and occupies a small area, making it suitable for the site requirements of small and medium-sized enterprises. The equipment is uniformly controlled by the control cabinet, and the processes of dosing, stirring, temperature control, and backwashing can be semi-automated. The operation process is simple and does not require professional technicians to be on duty, which reduces labor costs and operational difficulty.

[0014] 3. The selected coagulants, flocculants, and oxidants are all conventional industrial agents, which are easy to purchase and inexpensive. The dosage is precisely controlled by a metering pump to avoid waste. The backwashing mode of the filter tank can utilize the treated water that meets the standards, realizing water resource recycling and reducing water consumption. After the sludge is treated with a compound conditioning agent, the moisture content is reduced to 60-70%, meeting the hazardous waste collection standards and avoiding secondary pollution of the sludge. At the same time, the filtrate is returned for secondary treatment, improving the wastewater treatment recovery rate and further reducing treatment costs.

[0015] 4. The oxidizing agents can be flexibly selected according to the wastewater quality and treatment requirements, such as Fenton reagent, ozone-hydrogen peroxide synergistic agent or photocatalytic oxidizing agent, to adapt to the treatment of flaw detection wastewater of different concentrations and compositions; the treatment scale can be adjusted according to actual needs, which can meet the treatment needs of small and medium-sized enterprises, as well as the wastewater treatment of large production lines, and has a wide range of application prospects.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0017] Undoubtedly, such and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiments, which are illustrated in various accompanying drawings and figures.

[0018] To make the above and other objects, features and advantages of the present invention more apparent and understandable, one or more preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0020] In the accompanying drawings, the same parts use the same reference numerals, and the drawings are schematic and not necessarily drawn to actual scale.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on such drawings without creative effort.

[0022] Figure 1 These are schematic diagrams of the process equipment according to some embodiments of the present invention; Figure 2 This is a schematic diagram of the structure of a mixing tank according to some embodiments of the present invention; Figure 3 This is a schematic diagram of the sedimentation tank structure according to some embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of the stirring rack according to some embodiments of the present invention; Figure 5 This is a schematic diagram of the drug delivery system according to some embodiments of the present invention; Figure 6 The diagram shows the structure of the reaction vessel according to some embodiments of the present invention; Figure 7 This is a schematic diagram of the internal structure of the filter tank according to some embodiments of the present invention; Figure 8 This is a structural schematic diagram of the process flow diagram for some embodiments of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Mixing tank; 11. Stirring component; 111. Drive motor; 112. Stirring frame; 113. Support rod; 114. Stirring rod; 115. Stirring hole; 116. Support rod; 2. Dosing system; 21. Control cabinet; 22. Chemical tank; 23. Metering pump; 3. Sedimentation tank; 31. Circular pipe; 32. Bearing area; 33. First filter screen; 4. Reaction tank; 41. Pipeline; 42. Outlet end; 43. Inlet end; 5. Filter tank; 51. Second filter screen; 52. Water permeable pipe; 53. Through hole; 54. Mounting groove; 55. Water passage hole; 56. Hollow area; 57. Heating pipe; 6. Sludge treatment equipment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies are not connected through a transitional structure, but rather formed as a whole through a connecting structure. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] Reference Figure 1-8 This invention provides a wastewater treatment process for flaw detection, comprising: the process is implemented based on an integrated wastewater treatment device for flaw detection, the integrated treatment device comprising, in sequence, a mixing tank 1, a dosing system 2, a sedimentation tank 3, a reaction tank 4, a filter tank 5, and a sludge treatment device 6, the process comprising: This process is based on a series of interconnected components: mixing tank 1, dosing system 2, sedimentation tank 3, reaction tank 4, filtration tank, and sludge treatment equipment 6. The specific process steps are as follows: S1. Wastewater Collection and Pretreatment: The flaw detection wastewater is introduced into the mixing tank 1. The stirring component 11 of the mixing tank 1 is started to stir at a constant speed. The stirring component 11 is powered by the drive motor 111 at the top of the mixing tank 1, which drives the stirring frame 112 to rotate synchronously. The support rod 113 at the bottom of the stirring frame 112 transmits the power to multiple stirring rods 114, causing the stirring rods 114 to make circular motion in the wastewater. The multiple stirring holes 115 provided on the stirring rods 114 can effectively reduce the water flow resistance during stirring and reduce energy consumption. At the same time, the stirring holes 115 The support rod 116 can further disperse the water flow, break up the water stratification, ensure uniform mixing of wastewater, and avoid local uneven concentration affecting the subsequent treatment effect. The pH monitoring device installed in the mixing tank 1 can capture the changes in the pH value of the wastewater in real time and adjust it to the appropriate range of 6.5-7.5 in a timely manner, laying the foundation for subsequent coagulation and oxidation reactions. The stirring speed is controlled at 60-80 r / min, and the stirring time lasts for 10-15 minutes. This can not only work with the stirring component 11 to achieve full mixing of wastewater, but also avoid energy waste caused by excessive stirring.

[0030] S2. Sedimentation treatment: A quantitative amount of coagulant and flocculant is added to the chemical tank 22 via the dosing system 2, which is centrally controlled by the control cabinet 21. First, tap water or treated water is added to the chemical tank 22, then the chemical is poured in and stirred to dissolve, preventing clumping and ensuring effective dissolution. Subsequently, the dissolved chemical is quantitatively transferred to the mixing tank 1 via the metering pump 23 for further stirring. A staged stirring mode is used: first, high-speed stirring at 120-150 r / min for 3-5 minutes to rapidly diffuse the chemical throughout the wastewater; then, low-speed stirring at 40-60 r / min for 10-15 minutes to promote the aggregation of small flocs into larger flocs, preparing for subsequent solid-liquid separation. Polyaluminum chloride (PAC) is selected as the coagulant. The dosage is controlled at 80-120 mg / L. It can ionize in water to generate cations, neutralize the negative charge of colloidal particles in wastewater, and destabilize the colloidal particles. The flocculant is polyacrylamide (PAM), and the dosage is controlled at 5-10 mg / L. Its molecular chain can adsorb the destabilized colloidal particles, and aggregate the small flocs into large-volume, high-density flocs. The staged stirring mode can take into account both the agent diffusion efficiency and the floc formation effect. High-speed stirring ensures uniform distribution of the agent, while low-speed stirring avoids breaking large flocs. The metering pump 23 precisely controls the agent dosage to avoid waste caused by excessive addition and reduced treatment effect caused by insufficient addition. After stirring, the mixed wastewater is transported to the sedimentation tank 3 through the inlet pipe of the sedimentation tank 3.

[0031] S3. Sedimentation and Sludge Treatment: After wastewater enters sedimentation tank 3, it is allowed to settle for solid-liquid separation. A circular pipe 31 is installed in the middle of the top of sedimentation tank 3. Water is discharged into the circular pipe 31 through the inlet of the water pipe, allowing the wastewater to flow smoothly into sedimentation tank 3 and avoiding water flow impact that could damage the flocs. The first filter screen 33 installed on the outer wall of the circular pipe 31 can block large particles of impurities in the wastewater that cannot settle, preventing them from entering subsequent treatment stages and causing equipment blockage. The supernatant carrying area 32 set around the top of sedimentation tank 3 can collect the supernatant that has separated after settling. The supernatant overflows along the edge of the carrying area 32 and is introduced into reaction tank 4 through a water pump connected to a water pipe, realizing the orderly transportation of the supernatant. The bottom of sedimentation tank 3 is funnel-shaped, which allows the settled sludge to settle. Under the influence of gravity, the sediment settles at the bottom for centralized discharge. When the bottom sediment reaches a certain amount, it is transported to sludge treatment equipment 6 through the bottom sludge discharge pipe. Polyferric sulfate and diatomaceous earth compound conditioner (mass ratio 3:1) are added to sludge treatment equipment 6 at a dosage of 5-8% of the dry weight of the sludge. Polyferric sulfate can adsorb the water in the sludge and reduce the sludge moisture content, while diatomaceous earth can increase the looseness of the sludge and prevent sludge from clumping. The synergistic effect of the two can reduce the sludge moisture content, thereby meeting the hazardous waste collection standards. The filtrate generated during the pretreatment process contains a small amount of unsettled impurities and reagents, which is returned to mixing tank 1 for secondary treatment, which can improve the wastewater treatment recovery rate and avoid resource waste and environmental pollution.

[0032] S4. Oxidation Treatment: Add oxidizing agent to the supernatant, start the stirring device, control the stirring speed at 80-100 r / min, and the stirring time at 40-50 min to ensure the agent reacts fully with the wastewater. Oxidation destroys the molecular structure of recalcitrant organic matter and fluorescent substances, decomposing them into harmless small molecules, achieving deep removal of fluorescent substances and organic matter. The water temperature in reaction tank 4 is controlled at 25-35℃, and the pH value is adjusted to 2.5-3.5. These conditions maximize the reactivity of the oxidizing agent and accelerate the oxidation reaction rate. The fluorescent substance content is monitored in real time using an online fluorescence intensity monitor with a wavelength of 365-420 nm, a detection accuracy ≤0.01 mg / L, and a detection response time ≤10 s. The system continuously monitors changes in the content of fluorescent substances, allowing for timely adjustments to the dosage of reagents or reaction time to ensure that the degradation of fluorescent substances meets the standards. A pipe 41 surrounds the outer wall of the reaction tank 4, with an inlet 43 and an outlet 42 at each end. This pipe 41 connects to water or oil, allowing for temperature regulation within the reaction tank 4 by introducing hot or cold water or hot or cold oil. Combined with a temperature sensor on the inner wall of the tank, this ensures the water temperature remains stable within a suitable range of 25-35℃. Multiple valves installed on the pipe 41 allow for individual control of its opening and closing, facilitating equipment maintenance or adjustment of the medium flow rate, ensuring precise and efficient temperature control. The oxidizing agent can be one of Fenton's reagent, an ozone-hydrogen peroxide synergistic agent, or a photocatalytic oxidizing agent to effectively decompose recalcitrant substances.

[0033] S5. Filtration Treatment: The wastewater after oxidation treatment enters the filter tank 5. Second filter screens 51 (pore size 0.15-0.2mm) are installed at the bottom and top of the filter tank 5 to intercept large particulate impurities in the wastewater, preventing them from entering the permeable pipes 52 and causing blockage. The permeable pipes 52, horizontally installed between the second filter screens 51, are covered with multiple through holes 53 with a pore size of 0.2-0.3mm, allowing wastewater to enter the permeable pipes 52 evenly. The permeable pipes 52 are filled with activated carbon and quartz sand. The activated carbon is columnar, with particles 1.0-1.5mm in size, 2-3mm in length, and a particle strength ≥95%. It has a well-developed porous structure and can adsorb residual organic matter, fluorescent substances, and odors in the wastewater. The quartz sand particles have a diameter of 0.8-1.2mm and can filter out fine solid impurities in the water. Together with the activated carbon, they achieve dual filtration, further purifying the water quality. The side walls of the filter tank 5 are equipped with… Hollow region 56, around which a heating pipe 57 is installed, can appropriately increase the temperature inside the filter tank 5, accelerate the wastewater permeation rate, and reduce the adsorption and agglomeration of impurities on the surface of the filter media, thus helping to improve the filtration effect. The bottom of the filter tank 5 is connected to a pipe, and backwashing allows water to flow from the bottom to the top to flush the inside of the filter tank 5, removing impurities and sewage accumulated at the bottom of the filter tank 5 and preventing the filter media from clogging. The top is equipped with a threaded sealing cap, which has good sealing performance and can prevent wastewater leakage. The opposite side of the second filter screen 51 is provided with an installation groove 54 for the installation of the second filter screen 51. Then, the installation groove 54 and the water permeation pipe 52 are provided with water passage holes 55 to ensure that the water permeation pipe 52 is firmly installed, avoids displacement of the water permeation pipe 52 due to water flow impact, ensures the stability of the filtration process, and reduces the difficulty of equipment maintenance when replacing or maintaining the filter media.

[0034] S6. Effluent Testing and Discharge / Reuse: The filtered effluent undergoes comprehensive testing, with a focus on key indicators such as pH value, fluorescent substance content, and COD concentration to ensure compliance with national standards for wastewater discharge and reuse during flaw detection. If the test results meet the standards, the effluent can be discharged directly or disinfected to kill residual bacteria before being introduced into a storage tank for reuse, thus achieving water resource recycling. If the test results fail to meet the standards, the wastewater is returned to mixing tank 1 for full-process treatment until it meets the standards before being discharged or reused, avoiding environmental pollution caused by the discharge of substandard wastewater.

[0035] Example 1 This embodiment targets flaw detection wastewater with a COD of 850 mg / L, a fluorescent substance content of 12.3 mg / L, and a pH of 6.2, with a treatment capacity of 1 m³. 3 / h, strictly follow the above process, with specific parameters as follows: S1. Pretreatment stage: Adjust the pH value of the wastewater to 6.8, set the stirring speed to 70 r / min, and the stirring time to 12 min. The stirring component 11 drives the stirring frame 112, support rod 113, stirring rod 114 and support rod 116 through the drive motor 111. The stirring hole 115 and support rod 116 reduce the water flow resistance and achieve uniform mixing of wastewater. The pH monitoring device monitors and maintains the pH value in real time to provide suitable conditions for the subsequent coagulation reaction. S2. In the sedimentation stage, polyaluminum chloride (PAC) is selected as the coagulant at a dosage of 100 mg / L, and polyacrylamide (PAM) is selected as the flocculant at a dosage of 8 mg / L. The dosing system 2 is controlled by the control cabinet 21. First, tap water is added to the chemical tank 22, and then the chemical is poured in and stirred to dissolve. The solution is then accurately delivered to the mixing tank 1 by the metering pump 23. The system adopts a staged stirring mode of 130 r / min for 4 min and 50 r / min for 12 min. The charge neutralization effect of PAC and the flocculant aggregation effect of PAM are used to form large-volume flocs, which lays the foundation for solid-liquid separation. S3. In the sludge treatment stage, the dosage of sludge conditioner is 6% of the dry weight of sludge. With the synergistic effect of polyferric sulfate and diatomaceous earth compound conditioner, the moisture content of sludge is reduced to 65%, which meets the hazardous waste collection standard. In the sedimentation tank 3, the flow is stabilized by the circular pipe 31, the first filter screen 33 intercepts impurities, and the funnel-shaped bottom accumulates sludge. The supernatant is collected in the carrying area 32 and introduced into the reaction tank 4. The sludge is transported to the sludge treatment equipment 6 through the sludge discharge pipe, and the filtrate is returned to the mixing tank 1 for secondary treatment. S4. Oxidation treatment stage: Fenton's reagent is selected as the oxidizing agent, Fe 2+ The dosage is 65 mg / L, and the H2O2 dosage is 250 mg / L, through Fe 2+ The process catalyzes the generation of hydroxyl radicals from H2O2. Utilizing the strong oxidizing properties of these radicals, it thoroughly decomposes recalcitrant organic matter and fluorescent substances in wastewater. The stirring speed is controlled at 90 r / min, and the stirring time at 45 min. The water temperature inside reaction tank 4 is 30℃, and the pH value is 3.0, providing optimal conditions for the Fenton oxidation reaction. Pipes 41, arranged around the outer wall of reaction tank 4, are used to connect water or oil. The temperature inside the tank is regulated through medium circulation, and a temperature sensor monitors the water temperature in real time to ensure it remains stable at 30℃. An online fluorescence intensity monitors the fluorescence intensity in real time at a wavelength of 365-420 nm with an accuracy of ≤0.01 mg / L, ensuring that the degradation of fluorescent substances meets standards. S5. During the filtration stage, the heating tube 57 is turned on normally, controlling the temperature inside the filter tank 5 to 35℃, which helps to improve the filtration efficiency. The bottom of the filter tank 5 is connected to a pipe, and backwashing allows water to flow from the bottom to the top to flush the inside of the filter tank 5, which can remove the impurities and sewage accumulated at the bottom of the filter tank 5 and prevent the filter media from clogging. The top is equipped with a threaded sealing cap. The threaded connection has good sealing performance and can prevent wastewater leakage. The opposite side of the second filter screen 51 is provided with an installation groove 54 for the installation of the second filter screen 51. Then, the installation groove 54 and the water permeable pipe 52 are provided with water passage holes 55 to ensure that the water permeable pipe 52 is installed firmly and to avoid the water flow impact causing the water permeable pipe 52 to shift, ensuring the stability of the filtration process. At the same time, the filter media can be replaced or maintained, reducing the difficulty of equipment maintenance. S6. Effluent Testing and Discharge / Reuse: The filtered effluent undergoes comprehensive testing, with a focus on key indicators such as pH value, fluorescent substance content, and COD concentration to ensure compliance with national standards for wastewater discharge and reuse during flaw detection. If the test results meet the standards, the effluent can be discharged directly or disinfected to kill residual bacteria before being introduced into a storage tank for reuse, thus achieving water resource recycling. If the test results fail to meet the standards, the wastewater is returned to mixing tank 1 for full-process treatment until it meets the standards before being discharged or reused, avoiding environmental pollution caused by the discharge of substandard wastewater.

[0036] Example 2 This embodiment targets flaw detection wastewater with a COD of 920 mg / L, a fluorescent substance content of 14.7 mg / L, and a pH of 6.0, with a treatment capacity of 1 m³. 3 / h, with the following specific parameters: S1. Pretreatment stage: Adjust the pH value of the wastewater to 7.2, set the stirring speed to 75 r / min, and the stirring time to 14 min. The stirring component 11 drives the stirring frame 112, support rod 113 and stirring rod 114 to rotate through the drive motor 111. The water flow is dispersed by the stirring hole 115 and the support rod 116 to achieve uniform mixing of wastewater. The pH monitoring device adjusts the pH value in real time to ensure the pretreatment effect. S2, Sedimentation stage: The dosage of coagulant PAC is 110 mg / L, and the dosage of flocculant PAM is 9 mg / L. The staged stirring mode is 140 r / min for 3.5 min and 55 r / min for 13 min. The dosing system 2 controls the dissolution and delivery of the reagents through the control cabinet 21. The metering pump 23 ensures the accuracy of the reagent dosage. With the synergistic effect of PAC and PAM, the impurities are flocculated, which facilitates subsequent sedimentation and separation. S3. In the sludge treatment stage, the dosage of sludge conditioner is 7% of the dry weight of sludge. With the help of the dehydration and loosening effect of the compound conditioner, the moisture content of sludge is reduced to 63%. In the sedimentation tank 3, the flow is stabilized by the circular pipe 31, the first filter screen 33 intercepts impurities, and the sludge is collected at the bottom of the funnel. This allows the supernatant to be smoothly introduced into the reaction tank 4, the sludge is centrally treated, and the filtrate is recycled and reused, thereby improving the wastewater treatment recovery rate. S4. In the oxidation treatment stage, an ozone-hydrogen peroxide synergistic agent is selected, with an ozone dosage of 80 mg / L and an H2O2 dosage of 220 mg / L. The ozone and H2O2 synergistically generate a large number of hydroxyl radicals, enhancing the oxidation effect and decomposing recalcitrant substances more efficiently than a single oxidizing agent. The stirring speed is controlled at 95 r / min, and the stirring time is 48 min. The water temperature in reaction tank 4 is 32℃ and the pH value is 2.8. The pipe 41 surrounding the outer wall of reaction tank 4 is connected to water or oil. The temperature inside the tank is regulated by the circulation of the medium. The water temperature is monitored in real time by a temperature sensor to ensure that the temperature is stable at 32℃. The fluorescence intensity online monitor captures the content of fluorescent substances in real time to ensure that the oxidation meets the standards. The valve on pipe 41 controls the opening and closing of the medium and the flow rate to ensure that the temperature regulation is carried out in an orderly manner. S5. In the filtration stage, the heating tube 57 controls the temperature inside the filter tank 5 to 38℃, thereby increasing the filtration speed. The bottom of the filter tank 5 is connected to a pipe, and backwashing allows water to flow from the bottom to the top to flush the inside of the filter tank 5, removing impurities and wastewater accumulated at the bottom of the filter tank 5 and preventing the filter media from clogging. The top is equipped with a threaded sealing cap, which has good sealing performance and can prevent wastewater leakage. The opposite side of the second filter screen 51 is provided with an installation groove 54 for the installation of the second filter screen 51. Then, the installation groove 54 and the water permeable pipe 52 are provided with water passage holes 55 to ensure that the water permeable pipe 52 is installed firmly and to prevent the water flow impact from causing the water permeable pipe 52 to shift, ensuring the stability of the filtration process. At the same time, the filter media can be replaced or maintained, reducing the difficulty of equipment maintenance. S6. Effluent Testing and Discharge / Reuse: The filtered effluent undergoes comprehensive testing, with a focus on key indicators such as pH value, fluorescent substance content, and COD concentration to ensure compliance with national standards for wastewater discharge and reuse during flaw detection. If the test results meet the standards, the effluent can be discharged directly or disinfected to kill residual bacteria before being introduced into a storage tank for reuse, thus achieving water resource recycling. If the test results fail to meet the standards, the wastewater is returned to mixing tank 1 for full-process treatment until it meets the standards before being discharged or reused, avoiding environmental pollution caused by the discharge of substandard wastewater.

[0037] Example 3 This embodiment targets flaw detection wastewater with a COD of 780 mg / L, a fluorescent substance content of 10.5 mg / L, and a pH of 6.5, with a treatment capacity of 1 m³. 3 / h, with the following specific parameters: S1. Pretreatment stage: Adjust the pH value of the wastewater to 6.5, set the stirring speed to 65 r / min, and the stirring time to 11 min. The stirring component 11 drives the stirring frame 112, support rod 113 and stirring rod 114 to rotate through the drive motor 111. The stirring hole 115 and support rod 116 disperse the water flow and transmit power to ensure uniform mixing of the wastewater. The pH monitoring device maintains the pH value stable to provide suitable conditions for subsequent treatment stages. S2, Sedimentation stage: PAC coagulant dosage is 90 mg / L, PAM flocculant dosage is 6 mg / L, staged stirring mode is 125 r / min for 4.5 min and 45 r / min for 11 min. The dosing system 2 is controlled by control cabinet 21. After the agent is dissolved, it is quantitatively delivered by metering pump 23. With the synergistic effect of PAC and PAM, stable flocs are formed to achieve solid-liquid separation. S3, Sludge treatment stage: Sludge conditioner dosage is 5.5% of sludge dry weight. With the dewatering effect of compound conditioner, the sludge moisture content is reduced to 68%. Sedimentation tank 3 uses circular pipe 31 to stabilize the flow, first filter screen 33 to intercept impurities, and funnel-shaped bottom to collect sludge, so that the supernatant is introduced into reaction tank 4 for centralized sludge treatment. The filtrate is returned to mixing tank 1 to improve wastewater treatment efficiency. S4. In the oxidation treatment stage, a TiO2-based photocatalytic oxidant is selected at a dosage of 70 mg / L. Under suitable conditions, the photocatalytic agent generates hydroxyl radicals to achieve the oxidative decomposition of recalcitrant organic matter and fluorescent substances without secondary pollution. The stirring speed is controlled at 85 r / min and the stirring time is 42 min. The water temperature in the reaction tank 4 is 28℃ and the pH value is 3.2. The pipe 41 surrounding the outer wall of the reaction tank 4 is connected to water or oil. The temperature inside the tank is precisely controlled by the medium circulation. The water temperature is monitored in real time by a temperature sensor to ensure that the temperature is stable at 28℃. The fluorescence intensity online monitor monitors the content of fluorescent substances in real time to ensure that the degradation meets the standards. The valve on the pipe 41 controls the medium flow to ensure stable temperature control. S5. In the filtration stage, the heating tube 57 controls the temperature inside the filter tank 5 to 32℃. The bottom of the filter tank 5 is connected to a pipe. Backwashing allows water to flow from the bottom to the top to flush the inside of the filter tank 5, removing impurities and wastewater accumulated at the bottom of the filter tank 5 and preventing the filter media from clogging. The top is equipped with a threaded sealing cap. The threaded connection has good sealing performance and can prevent wastewater leakage. The opposite side of the second filter screen 51 is provided with an installation groove 54 for the installation of the second filter screen 51. Then, the installation groove 54 and the water permeable pipe 52 are provided with water passage holes 55 to ensure that the water permeable pipe 52 is installed firmly and to avoid the water flow impact causing the water permeable pipe 52 to shift, ensuring the stability of the filtration process. At the same time, the filter media can be replaced or maintained, reducing the difficulty of equipment maintenance. S6. Effluent Testing and Discharge / Reuse: The filtered effluent undergoes comprehensive testing, with a focus on key indicators such as pH value, fluorescent substance content, and COD concentration to ensure compliance with national standards for wastewater discharge and reuse during flaw detection. If the test results meet the standards, the effluent can be discharged directly or disinfected to kill residual bacteria before being introduced into a storage tank for reuse, thus achieving water resource recycling. If the test results fail to meet the standards, the wastewater is returned to mixing tank 1 for full-process treatment until it meets the standards before being discharged or reused, avoiding environmental pollution caused by the discharge of substandard wastewater.

[0038] Experimental data Experimental test report on wastewater treatment process for flaw detection Testing Item: Performance Verification of Integrated Wastewater Treatment Process for Flaw Detection Processing capacity: 1 m³ / h Testing basis: GB / T Standard Methods for Water Quality Testing I. Raw water quality

[0039] II. Dosage of the drug

[0040] III. Standard Experimental Effluent Data

[0041] IV. Removal Rate Standard Calculation Table

[0042] V. Comparison Table of This Process vs. Conventional Process Standards

[0043] VI. Determination of Effluent Compliance (National Standard)

[0044] VII. Experimental Conclusions The results of the three parallel experiments show that the integrated wastewater treatment process of "pretreatment - coagulation sedimentation - deep oxidation - filtration - sludge treatment" has a high efficiency in removing COD, fluorescent substances, suspended solids, petroleum hydrocarbons, and color. The average removal rate of COD is 95.08%, and the average removal rate of fluorescent substances is 99.25%. All effluent indicators are better than the national wastewater discharge standards for flaw detection and significantly better than conventional coagulation sedimentation processes. Furthermore, the sludge moisture content is reduced to 60%~70% after conditioning, meeting the requirements for hazardous waste collection. The filtrate return does not cause secondary pollution. The overall process is stable, reliable, highly automated, and highly applicable, enabling flaw detection wastewater to meet discharge standards and be reused as a resource.

[0045] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0046] The term "embodiment" in this specification refers to a specific feature or characteristic described in connection with an embodiment that is included in at least one embodiment of the invention. Therefore, phrases or "embodiments" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0047] Furthermore, the described features or characteristics can be incorporated into one or more embodiments in any other suitable manner. In the above description, specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented without the aforementioned specific details or may be implemented using other methods, components, materials, etc.

Claims

1. A wastewater treatment process for flaw detection, characterized in that, include: The process is based on an integrated wastewater treatment equipment for flaw detection, which includes a mixing tank (1), a dosing system (2), a sedimentation tank (3), a reaction tank (4), a filter tank (5), and a sludge treatment device (6) connected in sequence. The process includes: S1. Wastewater collection and pretreatment: The flaw detection wastewater is introduced into the mixing tank (1). The stirring component (11) of the mixing tank (1) is started to stir at a constant speed to make the wastewater evenly mixed. The wastewater level is monitored. The mixing tank (1) is equipped with a pH monitoring device to adjust the pH value of the wastewater to 6.5-7.5 in real time. The stirring speed is 60-80 r / min and the stirring time is 10-15 min. S2, Sedimentation treatment: Coagulant and flocculant are quantitatively added to the tank through the dosing system (2), and transported to the mixing tank (1) through the metering pump (23) of the dosing system (2) for further stirring. After stirring, the mixed water is transported to the sedimentation tank (3) through the inlet pipe of the sedimentation tank (3). The coagulant is polyaluminum chloride (PAC) with a dosage of 80-120 mg / L, and the flocculant is polyacrylamide (PAM) with a dosage of 5-10 mg / L. The staged stirring mode is: first stir at 120-150 r / min for 3-5 min, and then stir at 40-60 r / min for 10-15 min. S3. Sedimentation and sludge treatment: After the wastewater enters the sedimentation tank (3), solid-liquid separation is carried out. Then the supernatant is transported to the reaction tank (4). The bottom of the sedimentation tank (3) is funnel-shaped. The sludge is transported to the sludge pretreatment tank through the bottom sludge discharge pipe. Sludge conditioner is added for pretreatment. Then the sludge is collected as hazardous waste. The filtrate is returned to the mixing tank (1) for secondary treatment. The sludge conditioner added to the sludge treatment equipment (6) is a compound conditioner of polyferric sulfate and diatomaceous earth with a mass ratio of 3:

1. The amount added is 5-8% of the dry weight of the sludge. S4. Oxidation Treatment: Add an oxidizing agent to the supernatant and stir to allow the agent to fully react with the wastewater, achieving the oxidative decomposition of recalcitrant organic matter. The content of fluorescent substances is then monitored in real time using an online fluorescence intensity monitor. The oxidizing agent selected is one of Fenton's reagent, an ozone-hydrogen peroxide synergistic agent, or a photocatalytic oxidizing agent. If Fenton's reagent is selected, Fe... 2+ The dosage is 50-80 mg / L, the H2O2 dosage is 200-300 mg / L, the stirring speed is 80-100 r / min, the stirring time is 40-50 min, the water temperature in the reaction tank (4) is controlled at 25-35℃, the pH value is controlled at 2.5-3.5, the monitoring wavelength of the fluorescence intensity online monitoring instrument is 365-420 nm, the detection accuracy is ≤0.01 mg / L, and the detection response time is ≤10 s; S5. Filtration treatment: The wastewater after oxidation treatment enters the filter tank (5) for adsorption of organic matter and filtration of impurities. The filter tank (5) is filtered by activated carbon and quartz sand. The wastewater first passes through the second filter screen at the top and bottom of the filter tank for two-stage interception to remove large particles of impurities. Then it enters the permeable pipe and permeates evenly through the through holes on the surface of the permeable pipe. It comes into full contact with the activated carbon and quartz sand filled in the pipe. The activated carbon adsorbs residual organic matter and the quartz sand filters fine suspended impurities to achieve deep purification. The pore size of the second filter screen, the pore size of the permeable pipe, and the particle size of the activated carbon and quartz sand are matched to ensure smooth filtration and stable effect. S6. Effluent testing and discharge / reuse: Before discharge, test the effluent indicators. If they meet the standards, discharge or disinfect and reuse or introduce them into the storage tank for repeated use. If they do not meet the standards, return them to the mixing tank (1) for reprocessing.

2. The wastewater treatment process for flaw detection according to claim 1, characterized in that: In step S2, the dosing system (2) controls the pre-added tap water or treated water to be introduced into the dosing tank (22) of the dosing system (2) through the control cabinet (21), and then the medicine is poured into the dosing tank (22) for stirring, and then the metering pump (23) is used to deliver the quantitative amount to the mixing tank (1) connected to it.

3. The wastewater treatment process for flaw detection according to claim 1, characterized in that: In step S3, a circular pipe (31) is installed in the middle of the top of the sedimentation tank (3). Water is discharged from the inlet of the water in the circular pipe (31). A supernatant carrying area (32) is set up around the top of the sedimentation tank (3). Then, a water pipe is connected to the reaction tank (4) in the carrying area (32). Then, a first filter screen (33) that can cover the top of the sedimentation tank (3) is installed on the outer wall of the circular pipe (31) to block it. Then, after continuous water discharge, sedimentation occurs. The solid impurities that are precipitated will settle at the bottom of the sedimentation tank (3), while the supernatant will overflow into the carrying area (32) along the edge of the carrying area (32). Impurities that cannot be precipitated will be blocked by the filter screen. Then, a water pump is connected by a water pipe to introduce the supernatant into the reaction tank (4) for reaction. Then, when the sediment reaches the set discharge threshold, the sediment is discharged into the sludge treatment equipment (6) for treatment by the bottom sewage pipe.

4. The wastewater treatment process for flaw detection according to claim 1, characterized in that: In step S1, the drive motor (111) at the top of the mixing tank (1) drives the stirring frame (112), support rod (113) and stirring rod (114) to operate synchronously. The stirring hole (115) on the stirring rod (114) and the support rod (116) are used to disperse and stir the flaw detection wastewater in multiple dimensions, so that the wastewater is fully homogeneously mixed in the tank, effectively breaking the water stratification phenomenon, ensuring that the wastewater concentration and pH value are uniform, and improving the stability and treatment effect of the subsequent coagulation reaction.

5. The wastewater treatment process for flaw detection according to claim 1, characterized in that: In step S4, a temperature-controlled medium is introduced through a circulating pipe (41) surrounding the outer wall of the reaction tank (4). The medium flows in from the inlet (43) and out from the outlet (42) of the pipe (41), forming a circulating temperature-controlled loop. This stabilizes the water temperature inside the reaction tank (4) at 25-35°C. Combined with pH adjustment inside the tank, the oxidant is always in the optimal reaction conditions, ensuring the efficient decomposition of recalcitrant organic matter and fluorescent substances.

6. The wastewater treatment process for flaw detection according to claim 1, characterized in that: In step S5, the filtration section is assisted by heating the heating tube (57) in the hollow area (56) of the side wall of the filter tank (5), which increases the permeation rate of wastewater in the filter medium, reduces the adsorption and agglomeration of impurities on the surface of the filter material, avoids clogging of the filter channel, and at the same time, in conjunction with the backwashing process, maintains the long-term stable operation of the filter unit and extends the service life of the filter medium.

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