A mechanical washing wastewater treatment equipment

Abstract

The present invention discloses a mechanical washing wastewater treatment device, comprising a primary aeration tank, an anaerobic tank, a secondary aeration tank, and a sedimentation tank, which are sequentially connected along the wastewater conveying direction and can respectively accommodate mechanical washing wastewater. The primary aeration tank is connected to the downstream of the mechanical washing wastewater supply source, and the downstream of the sedimentation tank is connected to a drain pipe for discharging the treated liquid from the sedimentation tank. The anaerobic tank contains activated sludge mixed with anaerobic bacteria, and the primary aeration tank and the secondary aeration tank respectively contain activated sludge mixed with aerobic bacteria. A primary aeration device is provided at the bottom of the primary aeration tank, and a secondary aeration device is provided at the bottom of the secondary aeration tank. The mechanical washing wastewater treatment device also includes a fan for supplying air to the primary aeration device and the secondary aeration device. The mechanical washing wastewater treatment device can effectively improve the purification efficiency of mechanical washing wastewater, reduce its treatment cost, and achieve a better purification effect of mechanical washing wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of supporting equipment for a mechanical washing wastewater treatment process, and in particular to mechanical washing wastewater treatment equipment. Background Art

[0002] With the continuous improvement of industrial development level, the corresponding industrial wastewater treatment technology has also improved accordingly.

[0003] Mechanical washing wastewater is a common type of industrial wastewater. For example, electroplating utilizes the electrochemical principle of electrolysis to deposit a thin layer of another metal or alloy on a metal or non-metallic substrate. This process protects the substrate from oxidation and corrosion, improves wear resistance, conductivity, reflectivity, and enhances aesthetics. It is an essential process in many industrial sectors. During the electroplating process, metal components often undergo pretreatment, cleaning, and post-treatment to ensure the quality of the coating. During the cleaning phase, various solvents, alkaline, or acidic solutions are typically used to clean and degrease the electroplated products. The harmless treatment of the wastewater generated by these cleaning and degreasing processes is challenging and complex. Furthermore, processes such as mechanical cold working and wire and cable cold drawing generate significant amounts of washing wastewater. The water quality characteristics of this wastewater can vary depending on operating conditions and process details, making its harmless treatment even more challenging.

[0004] Overall, washing wastewater is complex, containing not only a variety of difficult-to-degrade organic compounds such as LAS (linear alkylbenzene sulfonate), sodium silicate, sodium dodecylbenzene sulfonate, alkylbenzene sulfonic acid, and carboxylic acid phosphates, but also toxic substances such as nonylphenol and heavy metals, posing significant risks to the environment and human health. Furthermore, the annual increase in the production of mechanical washing wastewater has led to increasing pressure for its harmless treatment. Therefore, timely and efficient treatment of mechanical washing wastewater is a key technical challenge in this field.

[0005] At present, the treatment methods for mechanical washing wastewater generally include physical treatment methods, chemical treatment methods, and biological treatment methods. Specifically, the physical method uses physical sedimentation and filtration as the main treatment means to filter out harmful substances in the wastewater; the chemical method adds specific chemical reagents to the wastewater in order to use these chemical reagents to react with specific pollutants in the wastewater to produce harmless substances after the reaction, thereby achieving the purpose of harmless treatment of harmful pollutants in the wastewater; and the biological method uses various microorganisms to decompose pollutants such as organic or inorganic substances in the wastewater, thereby achieving the purpose of harmless treatment of the wastewater, thereby avoiding wastewater pollution to the environment.

[0006] Among the above-mentioned wastewater treatment methods, the industry currently generally adopts physical or chemical methods as the main ones, and combines biological methods in individual processes to achieve coordinated treatment of wastewater with multiple methods.

[0007] However, due to the limitations of the current physical and chemical methods' own process flow and technical level, in the wastewater treatment process mainly based on physical methods, the supporting equipment investment and corresponding maintenance costs are high, and the overall process treatment efficiency is low; while in the wastewater treatment process mainly based on chemical methods, the consumption of related chemical reagents and other chemicals is large, and chemical residues may still exist in the discharged water after treatment, which has an adverse impact on the corresponding working environment and the health of the workers.

[0008] In view of this, how to optimize the treatment effect of mechanical washing wastewater, improve its treatment efficiency and reduce its treatment cost is an important technical problem that technicians in this field currently need to solve. Summary of the Invention

[0009] The purpose of the present invention is to provide a mechanical washing wastewater treatment equipment, which can effectively improve the purification efficiency of mechanical washing wastewater, reduce its treatment cost, and make the purification effect of mechanical washing wastewater better.

[0010] To solve the above technical problems, the present invention provides a mechanical washing wastewater treatment device, comprising a primary aeration tank, an anaerobic tank, a secondary aeration tank, and a sedimentation tank, which are sequentially connected along the wastewater conveyance direction and can respectively accommodate the mechanical washing wastewater. The primary aeration tank is connected downstream of a supply source of the mechanical washing wastewater, and a drain pipe is connected downstream of the sedimentation tank for discharging treated liquid from the sedimentation tank.

[0011] The anaerobic tank contains activated sludge mixed with anaerobic bacteria, and the primary aeration tank and the secondary aeration tank contain activated sludge mixed with aerobic bacteria respectively;

[0012] A primary aeration device is provided at the bottom of the primary aeration tank, a secondary aeration device is provided at the bottom of the secondary aeration tank, and the mechanical washing wastewater treatment equipment further comprises fans for supplying air to the primary aeration device and the secondary aeration device respectively.

[0013] Preferably, a regulating tank is connected between the primary aeration tank and the mechanical washing wastewater supply source along the wastewater transportation direction, and the regulating tank and the primary aeration tank are connected through a guide pipe, the inlet end of the guide pipe is connected to the bottom of the regulating tank, and the outlet end of the guide pipe is connected to the middle of the primary aeration tank.

[0014] Preferably, a stirrer is provided in the regulating tank.

[0015] Preferably, it further comprises a water tank with an opening at the top, wherein the primary aeration tank, the anaerobic tank and the secondary aeration tank are all located in the inner cavity of the water tank;

[0016] A primary flow guide component and a secondary flow guide component are symmetrically arranged in the horizontal direction and are gap-fitted in the inner cavity of the water tank, and the secondary flow guide component is located between the primary flow guide component and the sedimentation tank;

[0017] The first-level guide assembly includes an inclined first-level upper guide plate and a vertically arranged first-level lower guide plate, the bottom end of the first-level lower guide plate is gap-fitted with the bottom wall of the inner cavity of the water tank, the bottom end of the first-level upper guide plate is connected to the top end of the first-level lower guide plate, and the top end of the upper guide plate and the sedimentation tank are respectively located on both sides of the first-level lower guide plate in the horizontal direction;

[0018] The secondary guide assembly includes an inclined secondary upper guide plate and a vertically arranged secondary lower guide plate, the bottom end of the secondary lower guide plate is gap-fitted with the bottom wall of the inner cavity of the water tank, the bottom end of the secondary upper guide plate is connected to the top end of the secondary lower guide plate, and the top end of the upper guide plate is horizontally located between the secondary lower guide plate and the sedimentation tank;

[0019] The first-level aeration tank is formed between the first-level guide assembly and the inner wall of the water tank, the second-level aeration tank is formed between the second-level guide assembly and the inner wall of the water tank, and the anaerobic tank is formed between the first-level upper guide plate and the second-level upper guide plate.

[0020] Preferably, the first-level lower guide plate and the second-level lower guide plate are fitted with a gap in the horizontal direction to form a guide channel between the first-level lower guide plate and the second-level lower guide plate that communicates between the anaerobic tank and the second-level aeration tank.

[0021] Preferably, the sedimentation tank is also located in the inner cavity of the water tank, an isolation plate is provided on the bottom wall of the water tank protruding in the vertical direction, the secondary aeration tank is located between the isolation plate and the secondary flow guide assembly, the sedimentation tank is formed between the isolation plate and the inner wall of the water tank, and the sedimentation tank and the secondary aeration tank are respectively located on both sides of the isolation plate in the horizontal direction;

[0022] The top of the isolation plate is provided with an overflow port for liquid to flow from the secondary aeration tank to the sedimentation tank.

[0023] Preferably, the top of the secondary upper guide plate is provided with a baffle extending in the vertical direction, and the baffle and the overflow port are arranged in a horizontal direction and are clearance-fitted.

[0024] Preferably, a drainage port connecting the sedimentation tank and the drainage pipe is provided on the side wall of the water tank, and the drainage port is higher than the overflow port.

[0025] Preferably, a sludge return pipe is connected between the sedimentation tank and the primary aeration tank, and a sludge return pump is connected to the sludge return pipe. The inlet end of the sludge return pipe is connected to the bottom of the sedimentation tank, and the outlet end of the sludge return pipe is connected to the middle of the primary aeration tank.

[0026] Preferably, the primary aeration device and the secondary aeration device are connected in parallel, and the air inlet end of the primary aeration device and the air inlet end of the secondary aeration device are respectively connected to a flow meter in a one-to-one correspondence.

[0027] Compared with the above background technology, the mechanical washing wastewater treatment equipment provided by the present invention, during its operation, transports the mechanical washing wastewater that needs to be purified to the mechanical washing wastewater treatment equipment, and passes the wastewater into the primary aeration tank, and uses aerobic bacteria and other microorganisms in the activated sludge in the primary aeration tank to oxidize and degrade the small molecular organic pollutants in the wastewater, and combines with the activated sludge to adsorb some pollutants, thereby preliminarily reducing the organic matter concentration in the wastewater and reducing the pollutant purification load of the downstream subsequent process. The wastewater that has completed the preliminary treatment in the primary aeration tank is passed into the anaerobic tank so as to contact with the activated sludge mixed with anaerobic bacteria in the anaerobic tank, thereby utilizing the extracellular enzymes secreted by the anaerobic bacteria to hydrolyze the large molecular organic matter in the wastewater into small molecular organic matter, and the denitrifying bacteria and polyphosphate bacteria mixed in the activated sludge can play a role in the anaerobic tank, converting the nitrogen and phosphorus in the wastewater into gas or precipitate, thereby achieving nitrogen and phosphorus removal treatment of the wastewater. The wastewater treated in the anaerobic tank is then passed into the downstream secondary aeration tank, where aerobic bacteria mixed in the activated sludge can be used to further degrade and remove pollutants such as residual organic matter and trace amounts of heavy metal ions. The pH value of the wastewater can also be adjusted in the secondary aeration tank to meet discharge standards and avoid adverse effects on the surrounding environment. The wastewater treated in the secondary aeration tank is passed into a sedimentation tank for stagnant conditions to achieve mud-water separation. The liquid, free of activated sludge, can then be discharged from the sedimentation tank through a drain pipe to meet the treatment needs of other downstream processes. The mechanical washing wastewater treatment equipment utilizes a primary aeration tank, an anaerobic tank, and a secondary aeration tank that are sequentially arranged and connected along the liquid flow direction to achieve aerobic-anaerobic-aerobic alternating treatment of the mechanical washing wastewater, greatly optimizing the operating efficiency and treatment effect of purifying the mechanical washing wastewater using biological methods, avoiding the problem of incomplete purification of the mechanical washing wastewater by single anaerobic biodegradation treatment or aerobic biodegradation treatment, and simultaneously reducing the operating intensity and treatment load of a single biological treatment process. The equipment implements a process flow of first converting large-molecule organic pollutants in the wastewater into small-molecule organic pollutants and then subjecting the small-molecule organic pollutants to efficient degradation treatment, greatly reducing the difficulty of wastewater purification treatment and improving wastewater treatment efficiency. Furthermore, the entire wastewater treatment process is achieved entirely by microbial degradation treatment, without the need for a large number of filtration equipment in physical methods, thereby effectively reducing wastewater treatment costs. Furthermore, the treatment process does not require the use of various chemical reagents in chemical methods, effectively avoiding chemical residues in the liquid ultimately discharged after treatment, thereby achieving efficient, thorough, and low-cost harmless treatment of the mechanical washing wastewater.

[0028] In another preferred embodiment of the present invention, a regulating tank is connected between the primary aeration tank and the mechanical washing wastewater supply source along the wastewater transport direction. The regulating tank and the primary aeration tank are connected by a flow guide pipe, the inlet of which is connected to the bottom of the regulating tank, and the outlet of which is connected to the middle of the primary aeration tank. Wastewater from the mechanical washing wastewater supply source is allowed to settle in the regulating tank for initial accumulation and rectification, thereby preventing water flow impact on downstream aeration tanks and anaerobic tanks. This also ensures more balanced wastewater quality, improving the stability and efficiency of biochemical treatment of the wastewater by microorganisms in the downstream aeration tanks and anaerobic tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a structural perspective view of a mechanical washing wastewater treatment device provided in a specific embodiment of the present invention.

[0031] in:

[0032] 10-water tank; 101-first-level upper guide plate; 102-first-level lower guide plate; 103-second-level upper guide plate; 104-second-level lower guide plate; 105-diversion channel; 106-isolation plate; 107-overflow port; 108-baffle;

[0033] 11-first-stage aeration tank; 111-first-stage aeration device;

[0034] 12-Anaerobic tank;

[0035] 13-secondary aeration tank; 131-secondary aeration device;

[0036] 14-Sedimentation tank; 141-Drain pipe; 142-Drain port;

[0037] 15-fan; 151-flow meter;

[0038] 16- regulating tank; 161- diversion pipe; 162- mixer; 163- diversion check valve; 164- diversion pump;

[0039] 17-sludge return pipe; 171-sludge return pump;

[0040] 18-water reservoir; 181-liquid inlet pipe; 182-liquid inlet pump. DETAILED DESCRIPTION

[0041] The core of the present invention is to provide a mechanical washing wastewater treatment equipment, which can effectively improve the purification efficiency of mechanical washing wastewater, reduce its treatment cost, and make the purification effect of mechanical washing wastewater better.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] It should be noted in advance that, in the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] In addition, in the present invention, unless otherwise clearly stipulated and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them.

[0045] In addition, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is horizontally higher than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is horizontally lower than the second feature. The terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0046] Please refer to Figure 1 .

[0047] In a specific embodiment, the mechanical washing wastewater treatment equipment provided by the present invention includes a primary aeration tank 11, an anaerobic tank 12, a secondary aeration tank 13, and a sedimentation tank 14, which are sequentially connected along the wastewater conveying direction and can respectively accommodate the mechanical washing wastewater. The primary aeration tank 11 is connected to the downstream of the mechanical washing wastewater supply source, and the downstream of the sedimentation tank 14 is connected to a drain pipe 141 for discharging the treated liquid from the sedimentation tank 14.

[0048] The anaerobic tank 12 contains activated sludge mixed with anaerobic bacteria, and the primary aeration tank 11 and the secondary aeration tank 13 contain activated sludge mixed with aerobic bacteria respectively.

[0049] A primary aeration device 111 is provided at the bottom of the primary aeration tank 11 , a secondary aeration device 131 is provided at the bottom of the secondary aeration tank 13 , and the mechanical washing wastewater treatment equipment further includes a fan 15 for supplying air to the primary aeration device 111 and the secondary aeration device 131 respectively.

[0050] It is not difficult to understand that during the operation of the equipment, the fan 15 continuously supplies air or oxygen to each aeration device, so as to continuously supply dissolved oxygen to the first aeration tank 11 and the second aeration tank 13 through the first aeration device 111 and the second aeration device 131, respectively, thereby providing sufficient oxygen for the aerobic bacteria in each aeration tank to maintain the survival of aerobic bacteria and ensure the degradation and purification effect of aerobic bacteria on organic pollutants and residual trace heavy metals in electroplating wastewater. In fact, each aeration device and its corresponding adaptation structure with each aeration tank are relatively mature technical means in the industry. Its specific application method and layout conditions in this solution can be flexibly selected and adjusted according to actual working conditions and existing technical conditions in the industry. In principle, as long as it can meet the application requirements of the mechanical washing wastewater treatment equipment, it can be used.

[0051] During the specific operation process, the mechanical washing wastewater that needs to be purified is transported to the mechanical washing wastewater treatment equipment, and the wastewater is passed into the primary aeration tank 11. The aerobic bacteria and other microorganisms in the activated sludge in the primary aeration tank 11 are used to oxidize and degrade the small molecular organic pollutants in the wastewater, and some pollutants are adsorbed in combination with the activated sludge, so as to preliminarily reduce the concentration of organic matter in the wastewater and reduce the pollutant purification treatment load of the downstream subsequent processes.

[0052] The wastewater that has completed preliminary treatment in the primary aeration tank 11 is passed into the anaerobic tank 12 so as to come into contact with the activated sludge mixed with anaerobic bacteria in the anaerobic tank 12, thereby utilizing the extracellular enzymes secreted by the anaerobic bacteria to hydrolyze the macromolecular organic matter in the wastewater into small molecular organic matter. In addition, the denitrifying bacteria and polyphosphate bacteria mixed in the activated sludge can function in the anaerobic tank 12, converting nitrogen and phosphorus in the wastewater into gas or precipitate, thereby achieving nitrogen and phosphorus removal treatment of the wastewater.

[0053] The wastewater treated in the anaerobic tank 12 is continuously passed into the downstream secondary aeration tank 13 so that the aerobic bacteria mixed in the activated sludge in the secondary aeration tank 13 can be used to further degrade and remove pollutants such as residual organic matter and trace heavy metal ions in the wastewater. At the same time, the pH value of the wastewater can also be adjusted in the secondary aeration tank 13 so as to adjust the pH value of the wastewater to a state that meets the discharge standards to avoid adverse effects on the surrounding environment.

[0054] The wastewater treated in the secondary aeration tank 13 is passed into the sedimentation tank 14 for standing to achieve mud-water separation. After that, the liquid without activated sludge after mud-water separation can be discharged from the sedimentation tank 14 through the drainage pipe 141 to meet the treatment needs of other downstream process flows.

[0055] The mechanical washing wastewater treatment equipment utilizes a primary aeration tank 11, an anaerobic tank 12, and a secondary aeration tank 13 that are sequentially arranged and connected along the liquid flow direction to achieve aerobic-anaerobic-aerobic alternating treatment of the mechanical washing wastewater, thereby significantly optimizing the operating efficiency and treatment effect of purifying the mechanical washing wastewater using biological methods, avoiding the problem of incomplete purification of the mechanical washing wastewater by single anaerobic biodegradation treatment or aerobic biodegradation treatment, and simultaneously reducing the operating intensity and treatment load of a single biological treatment process. The equipment implements a process flow in which large-molecule organic pollutants in the wastewater are first converted into small-molecule organic pollutants and then subjected to efficient degradation treatment of the small-molecule organic pollutants, thereby significantly reducing the difficulty of wastewater purification treatment and improving wastewater treatment efficiency. Furthermore, the entire wastewater treatment process is achieved entirely by microbial degradation treatment, without the need for a large number of filtration equipment in physical methods, thereby effectively reducing wastewater treatment costs. Furthermore, the treatment process does not require the participation of various chemical reagents in chemical methods, effectively avoiding chemical residues in the liquid ultimately discharged after treatment, thereby achieving efficient, thorough, and low-cost harmless treatment of the mechanical washing wastewater.

[0056] Furthermore, a regulating tank 16 is connected between the primary aeration tank 11 and the mechanical washing wastewater supply source along the wastewater transport direction. A flow guide pipe 161 connects regulating tank 16 and primary aeration tank 11. The inlet of flow guide pipe 161 is connected to the bottom of regulating tank 16, and the outlet of flow guide pipe 161 is connected to the middle of primary aeration tank 11. Wastewater from the mechanical washing wastewater supply source is allowed to settle in regulating tank 16 for initial accumulation and rectification, preventing water flow impact on the downstream aeration tanks and anaerobic tanks 12. This also ensures more balanced wastewater quality, improving the stability and efficiency of the biochemical treatment of wastewater by microorganisms in the downstream aeration tanks and anaerobic tanks 12.

[0057] On this basis, a stirrer 162 is provided in the regulating tank 16. During operation, the stirrer 162 can be used to fully stir the water in the regulating tank 16, thereby uniformly mixing the water and further dispersing the suspended solids in the water. This allows for more complete and thorough microbial degradation, thereby improving the purification efficiency of the mechanical washing wastewater treatment equipment for the mechanical washing wastewater. Furthermore, the smooth operation of the stirrer 162 can effectively prevent solid matter deposition and scaling in the regulating tank 16, thereby ensuring efficient wastewater diversion from the regulating tank 16 to downstream workstations and ensuring smooth process flow.

[0058] Generally, the stirring agitator 162 can be a conventional paddle agitator 162 or a propeller agitator 162, and the stirring end of the agitator 162 should extend from the top of the regulating tank 16 into the regulating tank 16 to avoid adversely affecting the sealing structure of the side structure of the regulating tank 16. Of course, in actual applications, other types of agitators 162, such as a turbine agitator 162 or a ribbon agitator 162, can also be used. In principle, any type of agitator 162 that can meet the practical application requirements of the mechanical washing wastewater treatment equipment can be used.

[0059] Furthermore, the mechanical washing wastewater treatment equipment also includes a water tank 10 with an opening at the top, with a primary aeration tank 11, an anaerobic tank 12, and a secondary aeration tank 13 all located within the inner cavity of the water tank 10. A primary and a secondary flow guide assembly are symmetrically arranged horizontally within the inner cavity of the water tank 10 with a clearance fit, and the secondary flow guide assembly is located between the primary flow guide assembly and the sedimentation tank 14.

[0060] Specifically, the first-level guide assembly includes an inclined first-level upper guide plate 101 and a vertically arranged first-level lower guide plate 102. The bottom end of the first-level lower guide plate 102 is in clearance with the bottom wall of the inner cavity of the water tank 10. The bottom end of the first-level upper guide plate 101 is connected to the top of the first-level lower guide plate 102, and the top of the upper guide plate and the sedimentation tank 14 are located on both sides of the first-level lower guide plate 102 in the horizontal direction; and the second-level guide assembly includes an inclined second-level upper guide plate 103 and a vertically arranged second-level lower guide plate 104. The bottom end of the second-level lower guide plate 104 is in clearance with the bottom wall of the inner cavity of the water tank 10. The bottom end of the second-level upper guide plate 103 is connected to the top of the second-level lower guide plate 104, and the top of the upper guide plate is located between the second-level lower guide plate 104 and the sedimentation tank 14 in the horizontal direction.

[0061] On this basis, a primary aeration tank 11 is formed between the primary guide assembly and the inner wall of the water tank 10, a secondary aeration tank 13 is formed between the secondary guide assembly and the inner wall of the water tank 10, and an anaerobic tank 12 is formed between the primary upper guide plate 101 and the secondary upper guide plate 103.

[0062] Such a layout makes the first-level guide component and the second-level guide component arranged symmetrically in the horizontal direction based on their respective bending structures, thereby forming a "Y"-shaped layout, such as Figure 1 As shown, the primary and secondary flow guide assemblies cooperate to form a primary aeration tank 11 located on the left side of the water tank 10, an anaerobic tank 12 located in the middle and upper portion of the water tank 10, and a secondary aeration tank 13 located on the right side of the water tank 10. Thus, the turbulent flow driving force generated by the aeration output by the primary aeration device 111 located at the bottom of the primary aeration tank 11 can be utilized to drive the wastewater and activated sludge in the primary aeration tank 11 to form a circulating liquid flow, thereby driving the liquid in the primary aeration tank 11 to gradually diffuse outward from the center of the primary aeration tank 11 and gradually rise with the bubbles. The liquid flow accompanied by the bubbles flows along the primary upper flow guide plate 101 toward the outer wall of one side of the primary aeration tank 11 to the top of the primary aeration tank 11. At this point, a portion of the wastewater is blocked by the outer wall of the primary upper flow guide plate 101 and moves downward, ultimately forming a counterclockwise circulating flow within the primary aeration tank 11. The other part of the wastewater flows into the anaerobic tank 12 through the top edge of the first-level upper guide plate 101, and continues to circulate in the anaerobic tank 12 together with the activated sludge until the wastewater in the anaerobic tank 12 completes contact and degradation treatment with various anaerobic bacteria and continues to flow into the secondary aeration tank 13. The wastewater flowing into the secondary aeration tank 13 gradually rises along with the bubbles under the influence of the aeration generated by the secondary aeration device 131, and gradually flows upward along the secondary upper guide plate 103 toward the outer wall of one side of the secondary aeration tank 13 to the top of the secondary upper guide plate 103. During this process, part of the wastewater flows into the sedimentation tank 14 under the influence of the liquid flow, and the other part of the wastewater is blocked by the inclined outer wall of the secondary upper guide plate 103 and moves downward, eventually forming a clockwise circulating liquid flow in the secondary aeration tank 13, so as to provide liquid flow thrust for the wastewater subsequently introduced into the secondary aeration tank 13, thereby optimizing the mixing effect of the wastewater and activated sludge in the secondary aeration tank 13, and correspondingly improving the wastewater degradation treatment effect in the secondary aeration tank 13 and the liquid flow conduction efficiency between the secondary aeration tank 13 and the sedimentation tank 14.

[0063] Accordingly, the primary lower guide plate 102 and the secondary lower guide plate 104 are fitted horizontally with a gap, forming a diversion channel 105 between the primary lower guide plate 102 and the secondary lower guide plate 104, connecting the anaerobic tank 12 and the secondary aeration tank 13. In actual use, the primary aeration device 111 and the secondary aeration device 131 are respectively arranged on either side of the bottom outlet of the diversion channel 105. Generally, the primary aeration device 111 is arranged at the bottom of the primary aeration tank 11, near the bottom outlet of the diversion channel 105, and the secondary aeration device 131 is arranged at the bottom of the secondary aeration tank 13, near the bottom outlet of the diversion channel 105. Such an arrangement allows the wastewater flowing into the anaerobic tank 12 through the top edge of the first-level upper guide plate 101 to complete contact and degradation treatment with the anaerobic bacteria in the activated sludge in the anaerobic tank 12, and then enter the diversion channel 105 through the top inlet of the diversion channel 105, and be discharged from the bottom outlet of the diversion channel 105 and flow into the secondary aeration tank 13, thereby forming a smooth and efficient liquid flow between the first-level aeration tank 11, the anaerobic tank 12 and the secondary aeration tank 13, fully ensuring the contact effect and degradation treatment effect between the wastewater and the microorganisms in each aeration tank and the anaerobic tank 12, and making the circulation and transfer of wastewater between each workstation smoother and more efficient, thereby improving the purification treatment efficiency of the mechanical washing wastewater treatment equipment for mechanical washing wastewater.

[0064] Specifically, the sedimentation tank 14 is also located within the inner cavity of the water tank 10. A partition plate 106 protrudes vertically from the bottom wall of the water tank 10. The secondary aeration tank 13 is located between the partition plate 106 and the secondary diversion assembly. The partition plate 106 forms the sedimentation tank 14 between the inner wall of the water tank 10, and the sedimentation tank 14 and the secondary aeration tank 13 are horizontally located on either side of the partition plate 106. An overflow port 107 is provided at the top of the partition plate 106 for allowing liquid to flow from the secondary aeration tank 13 to the sedimentation tank 14. The placement of the overflow port 107 at the top of the partition plate 106 allows wastewater, driven by the circulating liquid flow within the secondary aeration tank 13, to gradually rise to the top of the secondary aeration tank 13 and flow smoothly and steadily into the sedimentation tank 14, ensuring continuous and smooth treatment and drainage of the wastewater, more complete contact between the wastewater and microorganisms, and more thorough degradation and purification of pollutants in the wastewater.

[0065] In addition, the regulating tank 16 can also be arranged in the water tank 10. Thus, the regulating tank 16 and the sedimentation tank 14 are both arranged in the water tank 10, which helps to further improve the component structure integration of the mechanical washing wastewater treatment equipment, making the overall structure of the equipment more regular and compact, and facilitating flexible arrangement and adjustment of the actual working environment.

[0066] More specifically, the top of the secondary upper guide plate 103 is provided with a baffle 108 extending in the vertical direction. The baffle 108 is arranged horizontally in alignment with the overflow port 107 and has a clearance fit. When the liquid flow in the secondary aeration tank 13 moves to the top of the secondary aeration tank 13, it can be fully blocked by the baffle 108, thereby preventing the liquid from flowing back from the top of the secondary aeration tank 13 into the anaerobic tank 12, thereby preventing the wastewater between the anaerobic tank 12 and the secondary aeration tank 13 from contaminating and interfering with each other, and preventing the wastewater that has completed biodegradation treatment by various anaerobic and aerobic bacteria in the secondary aeration tank 13 from flowing back into the anaerobic tank 12. The wastewater is repeatedly treated, thereby reducing the wastewater treatment pressure and work intensity at each workstation of the mechanical washing wastewater treatment equipment, making the operating cost of the mechanical washing wastewater treatment equipment lower and the operation process smoother and more efficient.

[0067] In addition, a drain port 142 is provided on the side wall of the water tank 10, connecting the sedimentation tank 14 with the drain pipe 141, and the drain port 142 is higher than the overflow port 107. After the mud and water are separated in the sedimentation tank 14, the relatively clear wastewater naturally flows into the drain port 142 through the drain port 142 for discharge from the equipment. Placing the drain port 142 at a height higher than the overflow port 107 effectively prevents the wastewater that enters the sedimentation tank 14 via the overflow port 107 from being directly discharged into the drain pipe 141 through the drain port 142, thereby preventing the activated sludge from being discharged along with the wastewater, thereby preventing the activated sludge from adversely affecting the process flow downstream of the mechanical washing wastewater treatment equipment and preventing the microorganisms mixed in the activated sludge from being wasted, thereby further reducing the operating costs of the mechanical washing wastewater treatment equipment.

[0068] On the other hand, a sludge return pipe 17 is connected between the sedimentation tank 14 and the primary aeration tank 11. A sludge return pump 171 is connected to the sludge return pipe 17. The inlet end of the sludge return pipe 17 is connected to the bottom of the sedimentation tank 14, and the outlet end of the sludge return pipe 17 is connected to the middle of the primary aeration tank 11. During operation of the equipment, after the wastewater carrying activated sludge completes mud-water separation in the sedimentation tank 14, the activated sludge is precipitated and accumulated at the bottom of the sedimentation tank 14. The activated sludge settled at the bottom of the sedimentation tank 14 can be pumped by the sludge return pump 171 into the sludge return pipe 17 through its inlet end and returned to the primary aeration tank 11 through the sludge return pipe 17 under the pumping action of the sludge return pump 171. This allows the activated sludge in the primary aeration tank 11 to re-participate in the subsequent wastewater treatment cycle, thereby avoiding waste of activated sludge and further reducing the operating cost of the mechanical washing wastewater treatment equipment.

[0069] More specifically, the sludge return pipe 17 is equipped with a sludge check valve that only allows sludge to flow from the sedimentation tank 14 to the primary aeration tank 11. This check valve effectively prevents activated sludge in the primary aeration tank 11 from entering the sedimentation tank 14 through the sludge return pipe 17, thereby ensuring effective liquid and sludge circulation between the aeration tanks, anaerobic tank 12, and sedimentation tank 14, and ensuring smooth and efficient operation of the equipment.

[0070] Accordingly, diversion pipe 161 is equipped with a diversion check valve 163 that only allows liquid to flow from regulating tank 16 to primary aeration tank 11. A diversion pump 164 is also provided to pump liquid from regulating tank 16 to primary aeration tank 11. Diversion pump 164 ensures efficient liquid flow between regulating tank 16 and primary aeration tank 11. Furthermore, diversion check valve 163 effectively prevents wastewater from primary aeration tank 11 from flowing back into regulating tank 16 via diversion pipe 161, thereby ensuring efficient wastewater flow between regulating tank 16 and primary aeration tank 11.

[0071] In addition, a water reservoir 18 can be arranged upstream of the regulating tank 16 so that the washing wastewater after mechanical cold processing, wire and cable cold drawing processing, and electroplating washing treatment can first enter the water reservoir 18 for accumulation to alleviate the impact of the liquid flow. Afterwards, the wastewater can be pumped from the water reservoir 18 to the regulating tank 16 through the pumping action of the liquid pump 182 connected to the liquid pipe 181 connected between the water reservoir 18 and the regulating tank 16, thereby completing the smooth and efficient drainage of the wastewater.

[0072] It should be noted that the activated sludge mentioned in this plan is generally taken directly from the activated sludge used in the sewage treatment plant. The type of microorganisms mixed in the activated sludge can be appropriately adjusted according to the actual working conditions and the type of wastewater being treated. In principle, as long as it can ensure the degradation and purification effect of pollutants in the mechanical washing wastewater and meet the operation needs of the mechanical washing wastewater treatment equipment.

[0073] In addition, the primary aeration device 111 and the secondary aeration device 131 are connected in parallel, and the air inlet of the primary aeration device 111 and the air inlet of the secondary aeration device 131 are connected to a flow meter 151 in a one-to-one correspondence. The gas flow rate entering each aeration device is monitored in real time by each flow meter 151, so that the aeration generation amount at the primary aeration device 111 and the secondary aeration device 131 can be monitored at any time. When necessary, the aeration operation status of the primary aeration device 111 and the secondary aeration device 131 can be adjusted respectively to match the operating requirements of the primary aeration tank 11 and the secondary aeration tank 13, thereby meeting the actual operating needs of the mechanical washing wastewater treatment equipment.

[0074] In summary, the mechanical washing wastewater treatment equipment provided in the present invention, during its operation, transports the mechanical washing wastewater that needs to be purified to the mechanical washing wastewater treatment equipment, and passes the wastewater into the primary aeration tank, and uses aerobic bacteria and other microorganisms in the activated sludge in the primary aeration tank to oxidize and degrade small molecular organic pollutants in the wastewater, and adsorbs some pollutants in combination with the activated sludge, thereby preliminarily reducing the organic concentration in the wastewater and reducing the pollutant purification load of the downstream subsequent process. The wastewater that has completed the preliminary treatment in the primary aeration tank is passed into the anaerobic tank so as to contact with the activated sludge mixed with anaerobic bacteria in the anaerobic tank, thereby utilizing the extracellular enzymes secreted by the anaerobic bacteria to hydrolyze the large molecular organic matter in the wastewater into small molecular organic matter, and the denitrifying bacteria and polyphosphate bacteria mixed in the activated sludge can play a role in the anaerobic tank, converting nitrogen and phosphorus in the wastewater into gas or precipitate, thereby achieving nitrogen and phosphorus removal treatment of the wastewater. The wastewater treated in the anaerobic tank is then passed into the downstream secondary aeration tank, where aerobic bacteria mixed in the activated sludge can be used to further degrade and remove pollutants such as residual organic matter and trace amounts of heavy metal ions. The pH value of the wastewater can also be adjusted in the secondary aeration tank to meet discharge standards and avoid adverse effects on the surrounding environment. The wastewater treated in the secondary aeration tank is passed into a sedimentation tank for stagnant conditions to achieve mud-water separation. The liquid, free of activated sludge, can then be discharged from the sedimentation tank through a drain pipe to meet the treatment needs of other downstream processes. The mechanical washing wastewater treatment equipment utilizes a primary aeration tank, an anaerobic tank, and a secondary aeration tank that are sequentially arranged and connected along the liquid flow direction to achieve aerobic-anaerobic-aerobic alternating treatment of the mechanical washing wastewater, greatly optimizing the operating efficiency and treatment effect of purifying the mechanical washing wastewater using biological methods, avoiding the problem of incomplete purification of the mechanical washing wastewater by single anaerobic biodegradation treatment or aerobic biodegradation treatment, and simultaneously reducing the operating intensity and treatment load of a single biological treatment process. The equipment implements a process flow of first converting large-molecule organic pollutants in the wastewater into small-molecule organic pollutants and then subjecting the small-molecule organic pollutants to efficient degradation treatment, greatly reducing the difficulty of wastewater purification treatment and improving wastewater treatment efficiency. Furthermore, the entire wastewater treatment process is achieved entirely by microbial degradation treatment, without the need for a large number of filtration equipment in physical methods, thereby effectively reducing wastewater treatment costs. Furthermore, the treatment process does not require the use of various chemical reagents in chemical methods, effectively avoiding chemical residues in the liquid ultimately discharged after treatment, thereby achieving efficient, thorough, and low-cost harmless treatment of the mechanical washing wastewater.

[0075] The above is a detailed introduction to the mechanical washing wastewater treatment equipment provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A mechanical washing wastewater treatment equipment, characterized in that, The system comprises a primary aeration tank, an anaerobic tank, a secondary aeration tank, and a sedimentation tank, which are sequentially connected along the wastewater conveying direction and can respectively accommodate mechanical washing wastewater. The bottom of the primary aeration tank is provided with a primary aeration device, the bottom of the secondary aeration tank is provided with a secondary aeration device, and further comprises fans for supplying air to the primary aeration device and the secondary aeration device respectively. The primary aeration tank is connected to the downstream of the mechanical washing wastewater supply source, and the downstream of the sedimentation tank is connected to a drain pipe for discharging treated liquid from the sedimentation tank. The anaerobic tank contains activated sludge mixed with anaerobic bacteria, and the primary aeration tank and the secondary aeration tank contain activated sludge mixed with aerobic bacteria respectively; A regulating tank is connected between the primary aeration tank and the mechanical washing wastewater supply source along the wastewater conveying direction. The regulating tank and the primary aeration tank are connected via a flow guide pipe. The inlet end of the flow guide pipe is connected to the bottom of the regulating tank, and the outlet end of the flow guide pipe is connected to the middle of the primary aeration tank. It also includes a water tank with an opening on the top, wherein the primary aeration tank, the anaerobic tank and the secondary aeration tank are all located in the inner cavity of the water tank; A primary flow guide component and a secondary flow guide component are symmetrically arranged in the horizontal direction and are gap-fitted in the inner cavity of the water tank, and the secondary flow guide component is located between the primary flow guide component and the sedimentation tank; The first-level guide assembly includes an inclined first-level upper guide plate and a vertically arranged first-level lower guide plate, the bottom end of the first-level lower guide plate is gap-fitted with the bottom wall of the inner cavity of the water tank, the bottom end of the first-level upper guide plate is connected to the top end of the first-level lower guide plate, and the top end of the first-level upper guide plate and the sedimentation tank are respectively located on both sides of the first-level lower guide plate in the horizontal direction; The secondary guide assembly includes an inclined secondary upper guide plate and a vertically arranged secondary lower guide plate, the bottom end of the secondary lower guide plate is gap-fitted with the bottom wall of the inner cavity of the water tank, the bottom end of the secondary upper guide plate is connected to the top end of the secondary lower guide plate, and the top end of the secondary upper guide plate is horizontally located between the secondary lower guide plate and the sedimentation tank; The first-level aeration tank is formed between the first-level guide assembly and the inner wall of the water tank, the second-level aeration tank is formed between the second-level guide assembly and the inner wall of the water tank, and the anaerobic tank is formed between the first-level upper guide plate and the second-level upper guide plate.

2. The mechanical washing wastewater treatment equipment according to claim 1, characterized in that: A stirrer is provided in the regulating tank.

3. The mechanical washing wastewater treatment equipment according to claim 1, characterized in that: The first-level lower guide plate and the second-level lower guide plate are fitted with each other in a horizontal direction to form a guide channel between the first-level lower guide plate and the second-level lower guide plate, which is connected to the anaerobic tank and the second-level aeration tank.

4. The mechanical washing wastewater treatment equipment according to claim 3, characterized in that: The sedimentation tank is also located in the inner cavity of the water tank. An isolation plate is provided on the bottom wall of the water tank in a vertically protruding manner. The secondary aeration tank is located between the isolation plate and the secondary flow guide assembly. The sedimentation tank is formed between the isolation plate and the inner wall of the water tank, and the sedimentation tank and the secondary aeration tank are respectively located on both sides of the isolation plate in the horizontal direction. The top of the isolation plate is provided with an overflow port for liquid to flow from the secondary aeration tank to the sedimentation tank.

5. The mechanical washing wastewater treatment equipment according to claim 4, characterized in that: The top of the secondary upper guide plate is provided with a baffle extending in the vertical direction, and the baffle and the overflow port are arranged in a horizontal direction and are clearance-matched.

6. The mechanical washing wastewater treatment equipment according to claim 4, characterized in that: A drainage port communicating with the sedimentation tank and the drainage pipe is provided on the side wall of the water tank, and the drainage port is higher than the overflow port.

7. The mechanical washing wastewater treatment equipment according to claim 1, characterized in that: A sludge return pipe is connected between the sedimentation tank and the primary aeration tank. A sludge return pipe is connected to a sludge return pump. The inlet end of the sludge return pipe is connected to the bottom of the sedimentation tank, and the outlet end of the sludge return pipe is connected to the middle of the primary aeration tank.

8. The mechanical washing wastewater treatment equipment according to claim 1, characterized in that: The primary aeration device and the secondary aeration device are connected in parallel, and the air inlet end of the primary aeration device and the air inlet end of the secondary aeration device are connected to flow meters in a one-to-one correspondence.

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