Wastewater treatment equipment

Abstract

The utility model provides wastewater treatment equipment, relates to the technical field of wastewater treatment, and aims to solve the problems that the COD (Chemical Oxygen Demand) value in industrial wastewater is difficult to effectively reduce and the like in related technologies. The wastewater treatment equipment comprises a water collecting tank and a pretreatment device, the pretreatment device comprises a flocculation precipitation device, an air flotation machine, a precipitation tank, a dehydrator and a first collection tank; the air flotation machine is provided with an inlet end and a first treatment liquid outlet, and the inlet end is communicated with the output end of the water collecting tank; the flocculent precipitation device is provided with a wastewater inlet, a flocculant inlet, a precipitate outlet and a second treatment liquid outlet, the wastewater inlet is communicated with the first treatment liquid outlet, and the second treatment liquid outlet is located above the precipitate outlet; the precipitate outlet is communicated with the precipitation tank, the precipitation tank is provided with a clarified liquid outlet and a precipitated slag outlet, and the precipitated slag outlet is communicated with an inlet of the dehydrator; the second treatment liquid outlet and the clarified liquid outlet are both communicated with the first collecting tank.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to wastewater treatment equipment. Background Art

[0002] At present, industrial wastewater is usually treated in the following ways: multiple-effect evaporation crystallization, biological method, SBR process, MBR electrolysis process, ion exchange method, membrane separation process, etc. The COD (Chemical Oxygen Demand) in industrial wastewater is relatively large. COD is the amount of oxidant consumed when a certain strong oxidant is used to treat a water sample under certain conditions. It reflects the degree of material pollution in the water. The larger the chemical oxygen demand, the more serious the organic pollution in the water. However, the COD value of industrial wastewater in related technologies is still relatively large after treatment, and it is difficult to meet the relevant national emission standards. Utility Model Content

[0003] The utility model aims to provide a wastewater treatment device for improving the problem that the COD value in industrial wastewater is difficult to effectively reduce in the related art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A wastewater treatment device is provided, comprising a water collection tank and a pretreatment device. The pretreatment device comprises: a flocculation sedimentation device, an air flotation machine, a sedimentation tank, a dehydrator and a first collecting tank; the air flotation machine has an inlet end and a first treatment liquid outlet, and the inlet end is connected to the output end of the water collection tank; the flocculation sedimentation device has a wastewater inlet, a flocculant inlet, a sediment outlet and a second treatment liquid outlet, the wastewater inlet is connected to the first treatment liquid outlet, and the second treatment liquid outlet is located above the sediment outlet; the sediment outlet is connected to the sedimentation tank, and the sedimentation tank is provided with a clarified liquid outlet and a sediment residue outlet, and the sediment residue outlet is connected to the inlet of the dehydrator; the second treatment liquid outlet and the clarified liquid outlet are both connected to the first collecting tank.

[0006] In some embodiments, the wastewater treatment equipment also includes a primary separation device and an evaporation concentration device, the primary separation device includes a filter element, the output end of the first collecting tank is connected to the input end of the primary separation device, the output end of the primary separation device is connected to the evaporation concentration device, and the filter element is located between the input end and the output end of the primary separation device.

[0007] In some embodiments, the filter element comprises a ceramic membrane.

[0008] In some embodiments, the wastewater treatment equipment also includes a nanofiltration membrane device located between the primary separation device and the evaporation concentration device, the output end of the primary separation device is connected to the input end of the nanofiltration membrane device, the output end of the nanofiltration membrane device is connected to the evaporation concentration device, and the nanofiltration membrane device includes a nanofiltration membrane located between the input end and the output end of the nanofiltration membrane device.

[0009] In some embodiments, the nanofiltration membrane comprises a surface separation layer comprising a polyelectrolyte.

[0010] In some embodiments, the wastewater treatment equipment also includes a RO reverse osmosis membrane device and a collection tank, the input end of the RO reverse osmosis membrane device is connected to the output end of the nanofiltration membrane device, the output end of the RO reverse osmosis membrane device is connected to the collection tank, and the RO reverse osmosis membrane device includes a RO reverse osmosis membrane located between the input end and the output end of the RO reverse osmosis membrane device.

[0011] In some embodiments, the RO reverse osmosis membrane has a microporous structure, and the pore size of the micropores is greater than or equal to 0.5 nm and less than or equal to 10 nm.

[0012] In some embodiments, the wastewater treatment equipment also includes an ozone oxidation device located between the RO reverse osmosis membrane device and the collection tank, the output end of the RO reverse osmosis membrane device is connected to the input end of the ozone oxidation device, the output end of the ozone oxidation device is connected to the collection tank, and ozone is introduced into the ozone oxidation device.

[0013] In some embodiments, the ozone oxidation device includes an ozone nozzle, and the ozone is sprayed through the ozone nozzle.

[0014] In some embodiments, the wastewater treatment equipment also includes a filter membrane device located between the ozone oxidation device and the collection tank, the output end of the ozone oxidation device is connected to the input end of the filter membrane device, the output end of the filter membrane device is connected to the collection tank, and the filter membrane device includes a filter membrane located between the input end and the output end of the filter membrane device.

[0015] Beneficial effects:

[0016] For the above-mentioned wastewater treatment equipment, the wastewater is first treated by an air flotation machine during the pretreatment process. The air flotation machine can promote the adhesion of fine bubbles to the tiny oil droplets to be removed. Since the density of the adhesive body is lower than that of water, it floats to the water surface, so that the oil particles in the water are separated and removed, thereby effectively reducing the COD in the wastewater. After that, the flocculation and sedimentation device is used for treatment. The flocculant can eventually neutralize the colloidal substances in the wastewater to form fluff sedimentation; flocculation and coagulation sedimentation can not only remove 10-3 ~10 -6 It can not only remove the fine suspended particles, but also the chromaticity, oil, microorganisms, nutrients such as nitrogen and phosphorus, heavy metals and organic matter. Afterwards, the second treated liquid treated by the flocculation sedimentation device is input into the sedimentation tank for further precipitation, so that the final precipitated material can be transported to the dehydrator for dehydration treatment, so as to ensure that the content of the sediment for dehydration treatment is large, and avoid the presence of some wastewater therein, resulting in a large amount of water removed by the dehydrator, and this part of water contains harmful substances and affects the discharge. Therefore, the wastewater treatment equipment in the present disclosure can be treated in different ways for many times, which can greatly reduce the COD in the wastewater, thereby effectively avoiding the occurrence of more precipitation due to the large COD in the subsequent process, which affects the subsequent steps, and can also ensure that the wastewater finally discharged meets the relevant national standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a wastewater treatment device provided in some embodiments of the present disclosure;

[0019] Figure 2 for Figure 1 Schematic diagram of some structures;

[0020] Figure 3 for Figure 1 Another part of the structural diagram;

[0021] Figure 4 for Figure 1 A schematic diagram of another part of the structure;

[0022] Reference numerals:

[0023] 10. Water collecting tank; 20. Pretreatment device; 21. Flocculation sedimentation device; 22. Flotation machine; 23. Sedimentation tank; 24. Dehydrator; 25. First collecting tank; 26. Flocculant reservoir; 30. Primary separation device; 40. Nanofiltration membrane device; 41. Transition tank; 42. Second collecting tank; 50. Evaporation concentration device; 60. RO reverse osmosis membrane device; 70. Ozone oxidation device; 80. Filter membrane device; 90. Collection tank; 100. Wastewater treatment equipment. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure claimed for protection, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "some embodiments", "some examples" or "exemplary" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the utility model. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0028] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0029] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. The term "A and / or B" includes the following combinations: only A, only B, or A and B. In the description of the present disclosure, C and D rotate relative to each other, which can mean that C is stationary while D rotates, or C rotates while D is stationary.

[0030] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. In addition, "fixed" can be a direct connection fixation, or an indirect fixation through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0031] Some embodiments of the present disclosure provide a wastewater treatment device, such as Figure 1 and Figure 2 As shown, the wastewater treatment equipment 100 includes: a water collection tank 10 and a pretreatment device 20 . The water collection tank 10 is used to collect wastewater. The output end of the water collection tank 10 is connected to the pretreatment device 20 to output the wastewater collected therein to the pretreatment device 20 .

[0032] The pretreatment device 20 includes: a flocculation sedimentation device 21 , an air flotation machine 22 , a sedimentation tank 23 , a dehydrator 24 and a first collecting tank 25 .

[0033] The air flotation machine 22 has an inlet and a first treatment liquid outlet, and the inlet is connected to the output of the water collection tank 10 .

[0034] With such arrangement, the wastewater in the water collection tank 10 can be transported to the air flotation machine 22 for treatment. Specifically, the air flotation machine 22 can generate a large number of microbubbles in the water by injecting high-pressure air to form a three-phase mixture of water, air and the removed substance. Under the combined action of various forces such as interfacial tension, bubble rising buoyancy and hydrostatic pressure, the microbubbles are promoted to adhere to the removed micro-oil droplets, and the microbubbles float to the water surface because the density of the adhesive body is less than that of water, thereby separating the oil particles in the water.

[0035] After being treated by the air flotation machine 22, the oily substances (including the above-mentioned oil particles) floating on the water surface can be removed by a scraper, and then it can be outsourced for treatment. The part of the air flotation machine 22 other than the above-mentioned oily substances is the first treatment liquid. Since the first treatment liquid removes a large amount of oily substances in the wastewater, it is beneficial to adjust the pH value of the wastewater and also to perform flocculation and sedimentation treatment on it. The above-mentioned first treatment liquid can be output through the first treatment liquid outlet for subsequent treatment steps.

[0036] The flocculation sedimentation device 21 has a wastewater inlet, a flocculant inlet, a sediment outlet, and a second treated liquid outlet.

[0037] The wastewater inlet is connected to the first treated liquid outlet of the flotation machine 22 , so that the first treated liquid can be input into the flocculation sedimentation device 21 ; in addition, the flocculant stored in the flocculant reservoir 26 can be input into the flocculation sedimentation device 21 through the flocculant inlet.

[0038] For example, the flocculant can be a flocculant. The flocculant is an electrolyte that can form micelles in the wastewater. The micelles neutralize the colloidal substances in the wastewater to form flocculent sedimentation. -3 ~10 -6 In this way, the first treatment liquid can be further treated by the action of the flocculant to remove the chromaticity, oil, microorganisms, nutrients such as nitrogen and phosphorus, heavy metals and organic matter in the first treatment liquid.

[0039] In some examples, before adding the flocculant, an acidity regulator or alkalinity regulator may be added to the flocculation sedimentation device 21 to adjust the pH value of the first treatment liquid to ensure that the flocculant can play a good role. The acidity regulator and alkalinity regulator may be flexibly selected and configured according to actual needs in combination with existing acidity regulators and alkalinity regulators.

[0040] The second treatment liquid outlet is located above the sediment outlet, so that the second treatment liquid and the sediment in the flocculation sedimentation device 21 can be output separately.

[0041] The sediment outlet is communicated with the sedimentation tank 23, and the sedimentation tank 23 is provided with a clarified liquid outlet and a sediment residue outlet. The sediment residue outlet can be located below the clarified liquid outlet, so as to facilitate the separate output of the sediment residue and the clarified liquid.

[0042] The outlet of the precipitated slag is communicated with the inlet of the dehydrator 24, and the precipitated slag is dehydrated by the dehydrator 24, and the cake-shaped waste slag blocks are removed and processed centrally.

[0043] The second treated liquid outlet and the clarified liquid outlet of the sedimentation tank 23 are both connected to the first collecting tank 25. The second treated liquid and the clarified liquid are collected by the first collecting tank, and then the wastewater treated by the pretreatment device can be further refined, thereby effectively improving the wastewater treatment efficiency and avoiding more precipitation in the subsequent process and affecting the efficiency of the refined treatment process.

[0044] For the above-mentioned wastewater treatment equipment, the wastewater is first treated by an air flotation machine during the pretreatment process. The air flotation machine can promote the adhesion of fine bubbles to the tiny oil droplets to be removed. Since the density of the adhesive body is lower than that of water, it floats to the water surface, so that the oil particles in the water are separated and removed, thereby effectively reducing the COD in the wastewater. After that, the flocculation and sedimentation device is used for treatment. The flocculant can eventually neutralize the colloidal substances in the wastewater to form fluff sedimentation; flocculation and coagulation sedimentation can not only remove 10 -3 ~10 -6 It can not only remove the fine suspended particles, but also the chromaticity, oil, microorganisms, nutrients such as nitrogen and phosphorus, heavy metals and organic matter. Afterwards, the second treated liquid treated by the flocculation sedimentation device is input into the sedimentation tank for further precipitation, so that the final precipitated material can be transported to the dehydrator for dehydration treatment, so as to ensure that the content of the sediment for dehydration treatment is large, and avoid the presence of some wastewater therein, resulting in a large amount of water removed by the dehydrator, and this part of water contains harmful substances and affects the discharge. Therefore, the wastewater treatment equipment in the present disclosure can be treated in different ways for many times, which can greatly reduce the COD in the wastewater, thereby effectively avoiding the occurrence of more precipitation due to the large COD in the subsequent process, which affects the subsequent steps, and can also ensure that the wastewater finally discharged meets the relevant national standards.

[0045] In some examples, a grille may be provided between the output end of the sump 10 and the inlet end of the flotation machine 22 to perform preliminary filtration, so that large particles of waste residue in the wastewater can be filtered to prevent the waste residue from affecting the working efficiency of the flotation machine 22. Exemplarily, a plurality of openings are provided on the grille, and the diameter of each opening may be 0.5 cm, so that the large particles of waste residue can be effectively filtered.

[0046] In some embodiments, Figure 3 As shown, the wastewater treatment equipment 100 also includes a primary separation device 30 and an evaporation concentration device 50. The primary separation device 30 includes a filter element. The output end of the first collecting tank 25 is connected to the input end of the primary separation device 30. The output end of the primary separation device 30 is connected to the evaporation concentration device 50. The filter element is located between the input end and the output end of the primary separation device.

[0047] With such arrangement, the primary separation device 30 can be used to perform primary filtration on the wastewater from the first collecting tank 25. Under a certain driving pressure, the primary separation device 30 can utilize filtering elements to further filter waste corrosion liquid, waste washing liquid, waste tank liquid, tank residue and waste liquid generated by acid (alkali) washing, oil removal, rust prevention, washing, phosphating, polishing and chemical polishing processes on the surfaces of metals and plastics, thereby effectively reducing the COD and oily substances in the above-mentioned wastewater, thereby achieving a good wastewater treatment effect on the one hand, and facilitating the subsequent treatment steps.

[0048] Exemplarily, the filter element may include a ceramic membrane. For example, the ceramic membrane may be a highly corrosion-resistant alumina inorganic ceramic membrane. This ensures corrosion resistance and thus ensures reliable operation of the membrane system over a long life.

[0049] Exemplarily, the filter element may adopt a large-channel filter membrane element, which can reduce the probability of the channel being blocked when the filtered stock solution is highly concentrated, and increase the stability of the equipment operation.

[0050] In some examples, ceramic membranes can be arranged in parallel and in the same plane. This can reduce the pressure loss between components, making the pressure distribution of membrane elements more uniform, reducing the pressure required by the circulation pump, and reducing the energy consumption of the system. On the other hand, the daily operation and maintenance of the equipment are simpler, more convenient, safer and more durable. Through the separation of high-multiple concentration of ceramic membranes, the water production can be controlled to be more than 85%, and the concentrated liquid can be reduced to less than 15%.

[0051] The evaporation concentration device 50 can set a temperature to evaporate the water molecules in the wastewater. Specifically, the evaporation concentration device 50 can vaporize and evaporate the wastewater materials in the waste liquid according to the different boiling points based on the principle of water vaporization and evaporation under vacuum, and decompose and fractionate the residual grease, heavy metals, and high molecular waste.

[0052] The operation process of the evaporation concentration device 50 is safe and reliable. By utilizing a vacuum device, heating, evaporation, vacuum and concentration are completed at one time. The process is single and waste heat can be recovered and reused, which can greatly save energy consumption and reduce equipment operation costs.

[0053] In some embodiments, Figure 3 As shown, the wastewater treatment equipment 100 also includes a nanofiltration membrane device 40 located between the primary separation device 30 and the evaporation concentration device 50, the output end of the primary separation device 30 is connected to the input end of the nanofiltration membrane device 40, the output end of the nanofiltration membrane device 40 is connected to the evaporation concentration device 50, and the nanofiltration membrane device includes a nanofiltration membrane located between the input end and the output end of the nanofiltration membrane device.

[0054] The nanofiltration membrane has a uniformly distributed microporous structure, which can be used to effectively filter wastewater.

[0055] Exemplarily, the pore size of the microporous structure is about 1 nm.

[0056] In some examples, the nanofiltration membrane has a surface separation layer, and the surface separation layer is composed of polyelectrolytes, so it has a certain retention rate for inorganic salts and can retain ions with a valence of more than two and other particles. The nanofiltration membrane only passes water molecules and some monovalent ions (such as sodium, potassium, chloride ions, etc.).

[0057] By using nanofiltration membrane, wastewater can be concentrated and purified at room temperature. There is no phase change, no chemical reaction, no introduction of other impurities and no decomposition and denaturation of the product. The product quality is good, the process yield is high, and the loss is small. The energy consumption is low, the operation is simple, the stability is good, and the maintenance is convenient.

[0058] In some examples, the wastewater treatment equipment 100 further includes a transition tank 41 , which can perform transition collection on the waste residue after filtration by the nanofiltration membrane device 40 , and then transport the waste residue to the evaporation concentration device 50 .

[0059] In some examples, the wastewater treatment equipment 100 also includes a second collection tank 42, which is connected to the output end of the nanofiltration membrane device 40, so that the wastewater filtered by the nanofiltration membrane device 40 can be collected; the second collection tank 42 can also collect the water evaporated by the evaporation concentration device 50, and then further process this part of the liquid.

[0060] In some embodiments, Figure 4 As shown, the wastewater treatment equipment 100 also includes a RO reverse osmosis membrane device 60 and a collecting tank 90. ​​The input end of the RO reverse osmosis membrane device 60 is connected to the output end of the nanofiltration membrane device 40, and the output end of the RO reverse osmosis membrane device 60 is connected to the collecting tank 90. ​​The RO reverse osmosis membrane device 60 includes a RO reverse osmosis membrane located between the input end and the output end of the RO reverse osmosis membrane device 60.

[0061] RO reverse osmosis membrane device uses pressure difference as driving force to separate solvent from solution. When pressure is applied to the liquid on one side of the reverse osmosis membrane, when the pressure exceeds the osmotic pressure of the reverse osmosis membrane, the solvent will reversely penetrate in the direction of natural penetration, so that the permeated solvent and permeate can be obtained on the low-pressure side of the reverse osmosis membrane, and a concentrated solution, i.e., concentrated liquid, can be obtained on the high-pressure side.

[0062] Through the RO reverse osmosis membrane, it can effectively intercept all dissolved salts and organic matter with a molecular weight greater than 100, while allowing water molecules to pass through. Therefore, the RO reverse osmosis membrane can greatly remove the sodium salts and high and low molecular ions, which are mainly conductive substances in the raw liquid, and effectively reduce the COD content in the raw liquid.

[0063] In some examples, the RO reverse osmosis membrane has a microporous structure, and the pore size of the micropores is greater than or equal to 0.5 nm and less than or equal to 10 nm.

[0064] RO reverse osmosis membrane has high desalination rate at high flow rate, high mechanical strength and service life, and can function at low operating pressure. In addition, the raw materials for making RO reverse osmosis membrane are widely available, and the processing is simple and low-cost.

[0065] In some examples, when the wastewater treatment equipment 100 includes the second collection tank 42 , the input end of the RO reverse osmosis membrane device 60 is connected to the second collection tank 42 , so that the wastewater filtered by the nanofiltration membrane device 40 and the water evaporated by the evaporation concentration device 50 can be further processed.

[0066] In some embodiments, Figure 4 As shown, the wastewater treatment equipment 100 also includes an ozone oxidation device 70 located between the RO reverse osmosis membrane device 60 and the collection tank 90. ​​The output end of the RO reverse osmosis membrane device 60 is connected to the input end of the ozone oxidation device 70, and the output end of the ozone oxidation device 70 is connected to the collection tank 90. ​​Ozone is introduced into the ozone oxidation device 70.

[0067] Ozone (O3) is a strong oxidant that can be directly produced from air without causing secondary pollution and is easy to operate. Ozone can strongly oxidize the primary filtered wastewater after secondary purification by physical processes to decompose the remaining macromolecules and remove the COD of low molecular wastewater, while also purifying and killing various bacteria in the wastewater.

[0068] In some examples, the ozone oxidation device 70 may include an ozone generator and an ozone oxidation tank, and the output end of the RO reverse osmosis membrane device 60 is connected to the ozone oxidation tank and the filtered liquid is input into the ozone oxidation tank. The ozone generator can continuously provide ozone to the ozone oxidation tank, so that the ozone reacts with the wastewater, thereby oxidizing and decomposing the remaining macromolecules and removing the COD of the low molecular wastewater.

[0069] In some examples, an ozone nozzle is provided on the ozone oxidation tank, and ozone is sprayed through the ozone nozzle, which is conducive to increasing the contact area between ozone and wastewater, thereby improving the reaction efficiency and reaction effect of ozone.

[0070] In some embodiments, Figure 4As shown, the wastewater treatment equipment 100 also includes a filter membrane device 80 located between the ozone oxidation device 70 and the collection tank 90, the output end of the ozone oxidation device 70 is connected to the input end of the filter membrane device 80, the output end of the filter membrane device 80 is connected to the collection tank 90, and the filter membrane device 80 includes a filter membrane located between the input end and the output end of the filter membrane device 80.

[0071] The filtration membrane device 80 can be set up using MBR technology, which is a high-efficiency sewage treatment technology that combines high-efficiency membrane separation technology with activated sludge method. It combines ultrafiltration / microfiltration with biological reaction to continuously separate products or by-products from the reaction zone, breaking the balance of the reaction, thereby greatly improving the reaction conversion rate and conversion speed, and has the advantages of low process energy consumption, high efficiency, simple design and operation, etc.

[0072] The filter membrane device 80 includes a planar filter membrane assembly, which can be placed in an aeration tank in the filter membrane device 80. The water after aerobic aeration and biological treatment is filtered through the filter membrane by a circulation pump and then pumped out.

[0073] The filter membrane device 80 using MBR technology has a compact structure and small footprint; the effluent quality of the filter membrane device 80 is high-quality and stable, and the organic matter removal efficiency is high. The wastewater treated by the filter membrane device 80 has a small amount of residual sludge, and ammonia nitrogen and difficult-to-degrade organic matter can be effectively removed.

[0074] However, in the biological reaction process of biological treatment, ineffective bacteria can grow and easily cause membrane contamination in the filter membrane device 80. Therefore, the wastewater treatment equipment 100 provided by the present disclosure is provided with an ozone oxidation device 70 before the filter membrane device 80, and sterilization is performed using ozone in the ozone oxidation device 70, thereby effectively reducing the risk of ineffective bacteria growing.

[0075] In addition, the filter membrane device 80 can also effectively ensure the normal and effective operation of the filter membrane device 80 through large-capacity and long-term aeration and biological decomposition, or through fine pressure-stabilizing membrane treatment and other measures.

[0076] For the above-mentioned wastewater treatment equipment 100, the filter membrane device 80 can filter out COD and other heavy metal particles that cannot be filtered out by the RO reverse osmosis membrane device 60, so that the final discharged water at least meets the national level 3 emission standards and can be discharged into the urban sewage discharge network.

[0077] Since the wastewater treatment equipment 100 is also provided with a collection tank 90, the collection tank 90 can be used to collect and test the wastewater treated by the wastewater treatment equipment 100. After it is detected that the treated wastewater meets the relevant national emission standards, it can be discharged into the urban sewage discharge network.

[0078] The above-mentioned wastewater may be oil / water, hydrocarbon / water mixture or emulsion generated during hydraulic press maintenance, machining using cutting fluid or other process; it may also be waste liquid generated during metal surface treatment or heat treatment, for example, waste corrosion liquid, waste washing liquid, waste tank liquid, tank residue and wastewater treatment sludge generated during metal and plastic surface pickling (or alkali washing), degreasing, rust prevention, washing, phosphating, polishing and chemical polishing.

[0079] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A wastewater treatment equipment, characterized in that: include: Sump; as well as A pretreatment device, the pretreatment device comprising: a flocculation sedimentation device, an air flotation machine, a sedimentation tank, a dehydrator and a first collecting tank; The flotation machine has an inlet end and a first treatment liquid outlet, and the inlet end is connected to the output end of the water collecting tank; the flocculation sedimentation device has a wastewater inlet, a flocculant inlet, a sediment outlet and a second treatment liquid outlet, the wastewater inlet is connected to the first treatment liquid outlet, and the second treatment liquid outlet is located above the sediment outlet; the sediment outlet is connected to the sedimentation tank, and the sedimentation tank is provided with a clarified liquid outlet and a sediment residue outlet, and the sediment residue outlet is connected to the inlet of the dehydrator; the second treatment liquid outlet and the clarified liquid outlet are both connected to the first collecting tank.

2. The wastewater treatment equipment according to claim 1, characterized in that: It also includes a primary separation device and an evaporation concentration device, wherein the primary separation device includes a filter element, the output end of the first collecting tank is connected to the input end of the primary separation device, the output end of the primary separation device is connected to the evaporation concentration device, and the filter element is located between the input end and the output end of the primary separation device.

3. The wastewater treatment equipment according to claim 2, characterized in that: The filter element comprises a ceramic membrane.

4. The wastewater treatment equipment according to claim 2, characterized in that: It also includes a nanofiltration membrane device located between the primary separation device and the evaporation concentration device, the output end of the primary separation device is connected to the input end of the nanofiltration membrane device, the output end of the nanofiltration membrane device is connected to the evaporation concentration device, and the nanofiltration membrane device includes a nanofiltration membrane located between the input end and the output end of the nanofiltration membrane device.

5. The wastewater treatment equipment according to claim 4, characterized in that: The nanofiltration membrane comprises a surface separation layer, and the surface separation layer comprises a polyelectrolyte.

6. The wastewater treatment equipment according to any one of claims 4-5, characterized in that: It also includes a RO reverse osmosis membrane device and a collecting tank, wherein the input end of the RO reverse osmosis membrane device is connected to the output end of the nanofiltration membrane device, the output end of the RO reverse osmosis membrane device is connected to the collecting tank, and the RO reverse osmosis membrane device includes a RO reverse osmosis membrane located between the input end and the output end of the RO reverse osmosis membrane device.

7. The wastewater treatment equipment according to claim 6, characterized in that: The RO reverse osmosis membrane has a microporous structure, and the pore diameter of the micropores is greater than or equal to 0.5 nm and less than or equal to 10 nm.

8. The wastewater treatment equipment according to claim 6, characterized in that: It also includes an ozone oxidation device located between the RO reverse osmosis membrane device and the collection tank, the output end of the RO reverse osmosis membrane device is connected to the input end of the ozone oxidation device, the output end of the ozone oxidation device is connected to the collection tank, and ozone is introduced into the ozone oxidation device.

9. The wastewater treatment equipment according to claim 8, characterized in that: The ozone oxidation device comprises an ozone nozzle, and the ozone is sprayed through the ozone nozzle.

10. The wastewater treatment equipment according to claim 8, characterized in that: It also includes a filter membrane device located between the ozone oxidation device and the collection tank, the output end of the ozone oxidation device is connected to the input end of the filter membrane device, the output end of the filter membrane device is connected to the collection tank, and the filter membrane device includes a filter membrane located between the input end and the output end of the filter membrane device.

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