Machining wastewater treatment equipment and treatment method

Abstract

The machining wastewater treatment equipment is connected with a wastewater input pipeline and comprises a three-phase separation device, an evaporation device, a filtering device and a concentrated solution collection device which are sequentially connected, the wastewater input pipeline is connected with the three-phase separation device, and the three-phase separation device is used for carrying out oil-water separation on wastewater; the evaporation device comprises a low-temperature evaporator and a cleaning barrel; the filtering device comprises a ceramic membrane filter and a molecular sieve COD (Chemical Oxygen Demand) filter; the ceramic membrane filter is used for removing water-soluble floating oil in distilled water; the molecular sieve COD filter is used for filtering the filtered wastewater, and clear water is discharged up to the standard or collected for reuse. The invention develops a brand-new treatment method for machining wastewater, and a brand-new machining wastewater treatment process is formed by combining three-phase separation, evaporation, ceramic membrane filtration, molecular sieve filtration and an anti-pollution membrane; the method is a full-physical process, does not need to add any medicament, and is more environment-friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a mechanical processing wastewater treatment device and a treatment method. Background Art

[0002] Wastewater treatment is a complex process that aims to remove pollutants from wastewater through physical, chemical and biological methods in order to purify water quality, reduce pollution and make full use of water resources. Wastewater treatment methods mainly include physical treatment, chemical treatment and biological treatment. The composition of industrial wastewater is complex and may contain various types of chemicals and heavy metal substances, such as surfactants, alkalis, alkaline additives, emulsifiers, ether compounds, etc. These pollutants are difficult to be simply separated and removed, and more complex treatment technologies are required. In addition, there are many types of harmful substances in industrial wastewater, with high content and great difficulty in treatment. Traditional physical, chemical and biological treatment methods often fail to meet national emission standards and may even cause secondary pollution. In addition, the waste treated by existing treatment methods has a low reuse rate and cannot be reused. In the existing industrial wastewater treatment process, a variety of reagents need to be added, which has high labor requirements, high personnel intensity and relatively high treatment costs.

[0003] Therefore, a mechanical processing wastewater treatment equipment and method are designed to treat the mechanical processing wastewater through a combination of three-phase separation, low-temperature evaporation, ceramic membrane filtration, and molecular sieve COD filtration. The entire treatment process can remove heavy metals, salts and most organic matter without adding any chemical agents, and can improve the treatment effect while improving the treatment efficiency, which is obviously of practical significance. Summary of the invention

[0004] The purpose of the present invention is to provide a mechanical processing wastewater treatment device and a treatment method, which combines three-phase separation, low-temperature evaporation, ceramic membrane filtration, and molecular sieve COD filtration to perform automated filtration and improve filtration accuracy and filtration efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a mechanical processing wastewater treatment device, connected to the wastewater input pipeline, including a three-phase separation device, an evaporation device, a filtering device and a concentrated liquid collecting device connected in sequence;

[0006] The wastewater input pipeline is connected to a three-phase separation device, and the three-phase separation device separates the wastewater into oil and water, and the separated floating oil enters the concentrated liquid collection device, and the clear liquid enters the evaporation device;

[0007] The evaporation device is used to evaporate the clear liquid from the three-phase separation device, and the evaporation device includes a low-temperature evaporator and a cleaning bucket; the cleaning bucket is used to provide cleaning liquid to the low-temperature evaporator, and the low-temperature evaporator evaporates the waste water at a low temperature to produce distilled water and evaporation concentrate, the evaporation concentrate enters the concentrate collection device, and the distilled water passes into the filtering device;

[0008] The filtering device comprises a ceramic membrane filter and a molecular sieve COD filter, wherein the water inlet of the ceramic membrane filter is connected to the low-temperature evaporator, and the water outlet of the ceramic membrane filter is connected to the molecular sieve COD filter; the ceramic membrane filter is used to remove water-soluble floating oil in distilled water; the molecular sieve COD filter is used to filter the wastewater filtered by the ceramic membrane filter, and generate clean water and filtered concentrated liquid after filtration, and the filtered concentrated liquid enters the concentrated liquid collection device, and the clean water meets the standards for discharge or is collected for reuse.

[0009] Preferably, a wastewater collecting tank is arranged between the wastewater input pipeline and the three-phase separation device, and the wastewater collecting tank includes a first collecting barrel, a water inlet pump and a first control unit; a first low liquid point, a first middle liquid point and a first high liquid point are arranged in the first collecting barrel.

[0010] Preferably, when the wastewater in the first collection barrel is at the first middle liquid point, the first control unit controls the three-phase separation device to start; when the wastewater in the first collection barrel is at the first low liquid point, the first control unit controls the three-phase separation device to stop running; when the wastewater in the first collection barrel is at the first high liquid point, the first control unit controls the wastewater input pipeline to stop transporting wastewater into the first collection barrel.

[0011] Preferably, a first overflow port is provided above the first high liquid point. When the wastewater in the first collecting barrel reaches the first overflow port, the wastewater flows out of the first collecting barrel from the first overflow port, so as to control the amount of wastewater in the first collecting barrel.

[0012] Preferably, a first drain low valve is provided at the bottom end of one side of the first collecting barrel to drain the waste water in the first collecting barrel.

[0013] Preferably, the water inlet pump comprises a main water inlet pump and a backup water inlet pump.

[0014] Preferably, the three-phase separation device is provided with a pre-filter and an evaporator raw water barrel. The pre-filter is located between the wastewater input pipeline and the three-phase separation device, and the pre-filter is used to pre-treat the wastewater; the evaporator raw water barrel is located between the three-phase separation device and the evaporation device, and the clear liquid in the three-phase separation device flows into the evaporation device through the evaporator raw water barrel; the water-soluble floating oil removed by the ceramic membrane filter flows back to the evaporator raw water barrel.

[0015] Preferably, a second control unit is provided on the evaporator raw water barrel; a second low liquid point, a second middle liquid point and a second high liquid point are provided in the evaporator raw water barrel; when the wastewater in the evaporator raw water barrel is at the second middle liquid point, the second control unit controls the low-temperature evaporator to start liquid intake; when the wastewater in the evaporator raw water barrel is at the second low liquid point, the second control unit controls the low-temperature evaporator to stop liquid intake; when the wastewater in the evaporator raw water barrel is at the second high liquid point, the second control unit controls the three-phase separation device to stop transporting wastewater into the evaporator raw water barrel.

[0016] A second overflow port is provided above the second high liquid point. When the waste water in the evaporator raw water barrel reaches the second overflow port, the waste water flows out of the evaporator raw water barrel from the second overflow port to control the amount of waste water in the evaporator raw water barrel.

[0017] Preferably, a second drain low valve is provided at the bottom end of one side of the evaporator raw water barrel to drain the waste water in the evaporator raw water barrel.

[0018] Preferably, the three-phase separation device comprises a sedimentation tank, a solid-liquid separation tank, an oil-liquid separation tank and a liquid collection tank connected in sequence;

[0019] The sedimentation tank is used to precipitate large particles of impurities in the wastewater;

[0020] The solid-liquid separation tank is provided with an inclined sedimentation element and an adsorption element, wherein the inclined sedimentation element blocks small particle impurities suspended in the wastewater, and the adsorption element adsorbs impurities in the wastewater;

[0021] The oil-liquid separation tank is used to control the wastewater flow rate to be no more than 0.5 m / h, so as to separate the floating oil and cutting fluid in the wastewater into layers, and automatically accumulate and discharge the floating oil;

[0022] The liquid collecting tank is used to collect impurities filtered out in the sedimentation tank and the solid-liquid separation tank, and floating oil separated in the oil-liquid separation tank.

[0023] Preferably, the liquid collecting tank is connected to a concentrated liquid collecting device, and the impurities and floating oil collected in the liquid collecting tank are to be subsequently processed or discharged into the concentrated liquid collecting device.

[0024] Preferably, the low-temperature evaporator comprises an evaporator, a compressor, a refrigerant, an expansion valve, a water storage tank and a sensor; the inlet of the evaporator receives the clear liquid produced by the three-phase separation device, the steam outlet of the evaporator is connected to the water storage tank, and a heat exchanger is provided between the steam outlet and the water storage tank; the water storage tank is connected to a ceramic membrane filter, and the liquid outlet of the evaporator is connected to a concentrated liquid collecting device; the compressor is used to compress the refrigerant to generate heat to evaporate the water quickly; the expansion valve is used to absorb heat for the conversion of the refrigerant from liquid to gas, so that the steam is quickly condensed and liquefied; the refrigerant releases heat in the evaporator to heat the wastewater; the refrigerant absorbs heat in the heat exchanger to condense the wastewater vapor; the sensor is used to detect bubbles in the evaporation process.

[0025] Preferably, the evaporation tank is in vacuum, and the evaporation temperature of the low-temperature evaporator is 35-40°C.

[0026] In the above, the evaporation and concentration process of the clear liquid in the low-temperature evaporator is as follows: the evaporator is automatically filled with water after being evaporating to a vacuum, and the compressor generates heat to heat the wastewater in the evaporator. Under the vacuum state, the wastewater temperature rises to 36-38°C, the wastewater begins to evaporate, and the preheating is completed; the evaporation temperature is set, the compressor compresses the refrigerant to the evaporation temperature, and while the water evaporates rapidly, the refrigerant absorbs heat after being vaporized through the expansion valve to refrigerate, and the steam rises and enters the water storage tank after being cooled and liquefied. The refrigerant absorbs heat and is compressed and heated by the compressor to reheat the wastewater. If the sensor detects that bubbles are rising during the evaporation process, the cleaning bucket provides cleaning liquid to the low-temperature evaporator. When the evaporation and concentration are completed, the water storage tank discharges distilled water to the ceramic membrane filter, and the evaporator discharges the concentrated liquid to the concentrated liquid collection device.

[0027] Preferably, the cleaning liquid arranged in the cleaning barrel includes a defoaming agent, and after the sensor detects that bubbles are rising during the evaporation process, the cleaning barrel provides the defoaming agent to the low-temperature evaporator for defoaming.

[0028] Preferably, the ceramic membrane filter comprises a circulating water tank, a circulating water pump, and a ceramic membrane assembly; the inlet of the circulating water tank is connected to the low-temperature evaporator, the outlet of the circulating water tank is connected to the inlet of the circulating water pump, and the outlet of the circulating water pump is connected to the ceramic membrane assembly.

[0029] In the above, the operation process of the ceramic membrane filter is as follows: the distilled water produced by the low-temperature evaporator flows to the circulating water tank, the outlet of the circulating water tank is connected to the circulating water pump, the outlet of the circulating water pump is connected to the ceramic membrane assembly, the water-soluble floating oil produced by the ceramic membrane assembly flows back to the circulating water tank, and the filtered wastewater produced by the ceramic membrane assembly flows to the molecular sieve COD filter. The circulating water tank is regularly emptied into the evaporator raw water bucket by setting the operating time.

[0030] Preferably, the ceramic membrane flux is 100LMH, the operating membrane surface flow rate is 4m / s, and the membrane cleaning flow rate is 2m / s.

[0031] Preferably, a molecular sieve liquid inlet barrel is arranged between the molecular sieve COD filter and the ceramic membrane filter, and a third control unit is arranged at the molecular sieve liquid inlet barrel; a third low liquid point, a third middle liquid point and a third high liquid point are arranged in the molecular sieve liquid inlet barrel.

[0032] Preferably, when the wastewater in the molecular sieve inlet barrel is at the third middle liquid point, the third control unit controls the molecular sieve COD filter to start; when the wastewater in the molecular sieve inlet barrel is at the third low liquid point, the third control unit controls the molecular sieve COD filter to stop inletting; when the wastewater in the molecular sieve inlet barrel is at the third high liquid point, the third control unit controls the ceramic membrane filter to stop transporting wastewater into the molecular sieve inlet barrel.

[0033] Preferably, a third overflow port is provided above the third high liquid point. When the wastewater in the molecular sieve inlet barrel reaches the third overflow port, the wastewater flows out of the molecular sieve inlet barrel from the third overflow port to control the amount of wastewater in the raw water barrel of the evaporator.

[0034] Preferably, a third drain low valve is provided at the bottom end of one side of the molecular sieve liquid inlet barrel to drain the waste water in the molecular sieve liquid inlet barrel.

[0035] Preferably, the molecular sieve COD filter includes a regeneration device and several molecular sieve filter tanks for filtering wastewater, and the several molecular sieve filter tanks operate alternately between main filtering operation, auxiliary filtering operation and in-situ regeneration operation. Molecular sieve filter material is arranged in the molecular sieve filter tank, and the regeneration device is used to clean and regenerate the molecular sieve filter material.

[0036] Preferably, the regeneration device comprises a steam generator, and the steam generator introduces steam into the filter tank to regenerate and clean the inside of the filter tank, and the cleaning water generated during the regeneration and cleaning process flows into the concentrate collecting device.

[0037] Preferably, the number of the filter tanks is at least 3, wherein the molecular sieve filter tank for filtering the wastewater includes a main filter tank for performing main filtering operations, an auxiliary filter tank for performing auxiliary filtering operations, and a regeneration filter tank for performing in-situ regeneration operations; the molecular sieve filter tank is controlled to perform main filtering operations, auxiliary filtering operations, and in-situ regeneration operations alternately.

[0038] Preferably, when the timing or quantitative standard is reached, the control device switches the main filter tank to perform in-situ regeneration operation, switches the auxiliary filter tank to the main filter tank for main filtering operation, and switches the filter tank performing in-situ regeneration operation to the auxiliary filter tank for auxiliary filtering operation.

[0039] Preferably, the molecular sieve filter material comprises an organic polymer copolymer mainly composed of a polymer organic material, wherein the polymer organic material comprises styrene and divinylbenzene, and the specific surface area of ​​the molecular sieve filter material is 450 to 600 m 2 / g.

[0040] Preferably, the water inlet pressure of the molecular sieve filter tank is 5 bar, and the water inlet flow rate is 4 BV / h.

[0041] Preferably, it also includes an anti-pollution membrane filtration system, which is arranged at the outlet of the molecular sieve COD filter. The anti-pollution membrane filtration system and the molecular sieve COD filter are circulated and connected through a pipeline to circulate and concentrate the anti-pollution membrane concentrated liquid produced by the anti-pollution membrane filtration system. The anti-pollution membrane filtration system includes a security filter and an anti-pollution membrane.

[0042] Preferably, the anti-pollution membrane comprises fully aromatic high-crosslinked polyamide, and the flux of the anti-pollution membrane is 18LMH.

[0043] Preferably, the security filter is arranged at the inlet of the anti-pollution membrane to protect the anti-pollution membrane.

[0044] Preferably, the anti-fouling membrane system has a built-in concentrated water circulation pipeline, and the purpose of flushing the anti-fouling membrane with a large flow rate and reducing the risk of clogging of the membrane system is achieved by controlling the internal circulation ratio of concentrated water.

[0045] Preferably, the internal circulation ratio of the concentrated water in the concentrated water circulation pipeline is 60% to 80%.

[0046] Preferably, a second collecting barrel is provided between the anti-pollution membrane filtration system and the molecular sieve COD filter, and a fourth control unit is provided at the second collecting barrel; a fourth low liquid point, a fourth middle liquid point and a fourth high liquid point are provided in the second collecting barrel.

[0047] Preferably, when the wastewater in the second collection barrel is at the fourth middle liquid point, the fourth control unit controls the anti-pollution membrane filtration system to start; when the wastewater in the second collection barrel is at the fourth low liquid point, the fourth control unit controls the anti-pollution membrane filtration system to stop running; when the wastewater in the second collection barrel is at the fourth high liquid point, the fourth control unit controls the molecular sieve COD filter to stop running.

[0048] Preferably, a fourth overflow port is provided above the fourth intermediate liquid point, and when the wastewater in the second collecting barrel reaches the fourth overflow port, clean water flows out of the second collecting barrel from the fourth overflow port, so as to control the amount of wastewater in the second collecting barrel.

[0049] Preferably, a fourth drain low valve is provided at the bottom end of one side of the second collecting barrel to drain the waste water in the second collecting barrel.

[0050] Preferably, the water outlet of the anti-pollution membrane filtration system is also provided with a water production barrel, which is used to collect the clean water after filtration. The water production barrel is provided with a fifth high liquid point. When the clean water in the water production barrel is at the fifth high liquid point, the anti-pollution membrane filtration system is controlled to stop running.

[0051] The present application also claims a method for treating mechanical processing wastewater, which uses the mechanical processing wastewater treatment equipment described above, and comprises the following steps:

[0052] S1. Wastewater enters the three-phase separation device through the wastewater input pipeline, and produces clear liquid and floating oil after being treated by the three-phase separation device. The clear liquid is transported to the evaporation device, and the floating oil flows into the concentrated liquid collection device;

[0053] S2. The low-temperature evaporator in the evaporation device evaporates the clear liquid from the three-phase separation device to produce distilled water and evaporation concentrate after evaporation. The evaporation concentrate enters the concentrate collection device, and the distilled water passes into the ceramic membrane filter;

[0054] S3, the ceramic membrane filter removes the water-soluble floating oil in the distilled water, and the water-soluble floating oil flows back to the evaporation device; the wastewater filtered by the ceramic membrane filter flows to the molecular sieve COD filter;

[0055] S4, molecular sieve COD filter is used to filter the wastewater filtered by the ceramic membrane filter, generating clean water and filtered concentrate after filtration, and the filtered concentrate enters the concentrated liquid collection device; the obtained clean water is discharged in compliance with the standards or collected for reuse.

[0056] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0057] 1. The present invention has opened up a new treatment method for machining wastewater that breaks the traditional process. The existing machining wastewater treatment technology is mainly based on the process of combining coagulation sedimentation with biochemical treatment. The present invention combines three-phase separation, evaporation, ceramic membrane filtration, molecular sieve filtration, and anti-pollution membrane into a new machining wastewater treatment process; the present invention is a full physical process, which does not require the addition of any reagents, and is a truly environmentally friendly treatment method;

[0058] 2. The present invention circulates and concentrates the anti-pollution membrane concentrated liquid produced by the anti-pollution membrane filtration system by connecting the anti-pollution membrane filtration system to the molecular sieve COD filter through a pipeline, thereby further improving the adsorption efficiency and desorption efficiency of the molecular sieve COD filter without changing the parameters of the molecular sieve COD filter.

[0059] 3. The process is simple, fully automated, and user-friendly. Compared with existing biochemical processes, it greatly reduces the investment in labor costs. It can achieve standardized production and modular introduction, reduce production costs and user investment, and does not require duplicate construction. It can be relocated at any time with the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, some of the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 A process flow chart of an embodiment.

[0062] Figure 2 The figure is a schematic diagram of the overall structure of an embodiment.

[0063] Figure 3 It is a schematic diagram of the structure of a wastewater input pipeline connection, a three-phase separation device, and an evaporation device according to an embodiment;

[0064] Figure 4 is a schematic structural diagram of a filtering device according to an embodiment;

[0065] Figure 5 The figure is a schematic diagram of the structure of an anti-pollution membrane filtration system according to an embodiment.

[0066] Among them, 1. Wastewater input pipeline; 2. Three-phase separation device; 3. Evaporation device; 4. Filter device; 5. Concentrate collection device; 6. Ceramic membrane filter; 7. Molecular sieve COD filter; 8. Wastewater collection tank; 9. Pre-filter; 10. Evaporator raw water bucket; 11. Molecular sieve liquid inlet bucket; 12. Anti-pollution membrane filtration system; 13. Second collection bucket; 14. Water production bucket; 15. Fifth high liquid point;

[0067] 31. Low temperature evaporator; 32. Cleaning barrel;

[0068] 71. Regeneration equipment; 72. Molecular sieve filter tank; 73. Main filter tank; 74. Auxiliary filter tank; 75. Regeneration filter tank;

[0069] 81. First collecting bucket; 82. Water inlet pump; 83. First low liquid point; 84. First middle liquid point; 85. First high liquid point; 86. First overflow port;

[0070] 101, second low liquid point; 102, second middle liquid point; 103, second high liquid point; 104, second overflow port; 105, second low emptying valve;

[0071] 111, third low liquid point; 112, third middle liquid point; 113, third high liquid point; 114, third overflow port; 115, third emptying low valve;

[0072] 131. The fourth low liquid point; 132. The fourth middle liquid point; 133. The fourth high liquid point; 134. The fourth overflow port; 135. The fourth drain low valve. DETAILED DESCRIPTION

[0073] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] Embodiment 1

[0075] like Figure 1-Figure 5 As shown, a mechanical processing wastewater treatment device is connected to a wastewater input pipeline 1, and includes a three-phase separation device 2, an evaporation device 3, a filtering device 4 and a concentrated liquid collecting device 5 connected in sequence;

[0076] The wastewater input pipeline 1 is connected to the three-phase separation device 2, and the three-phase separation device 2 separates the wastewater into oil and water. The separated floating oil enters the concentrated liquid collection device 5, and the clear liquid enters the evaporation device 3;

[0077] The evaporation device 3 is used to evaporate the clear liquid from the three-phase separation device 2, and the evaporation device 3 includes a low-temperature evaporator 31 and a cleaning barrel 32; the cleaning barrel 32 is used to provide cleaning liquid to the low-temperature evaporator 31, and the low-temperature evaporator 31 evaporates the waste water at a low temperature to produce distilled water and evaporation concentrate, and the evaporation concentrate enters the concentrate collection device 5, and the distilled water passes into the filtering device 4;

[0078] The filtering device 4 includes a ceramic membrane filter 6 and a molecular sieve COD filter 7, wherein the water inlet of the ceramic membrane filter 6 is connected to the low-temperature evaporator 31, and the water outlet of the ceramic membrane filter 6 is connected to the molecular sieve COD filter 7; the ceramic membrane filter 6 is used to remove water-soluble floating oil in the distilled water; the molecular sieve COD filter 7 is used to filter the wastewater filtered by the ceramic membrane filter 6, and generate clean water and filtered concentrated liquid after filtration, and the filtered concentrated liquid enters the concentrated liquid collecting device 5, and the clean water meets the standards for discharge or is collected for reuse.

[0079] Preferably, a wastewater collecting tank 8 is arranged between the wastewater input pipe 1 and the three-phase separation device 2, and the wastewater collecting tank 8 includes a first collecting barrel 81, a water inlet pump 82 and a first control unit; a first low liquid point 83, a first middle liquid point 84 and a first high liquid point 85 are arranged in the first collecting barrel 81.

[0080] Preferably, when the wastewater in the first collecting barrel 81 is at the first middle liquid point 84, the first control unit controls the three-phase separation device 2 to start; when the wastewater in the first collecting barrel 81 is at the first low liquid point 83, the first control unit controls the three-phase separation device 2 to stop running; when the wastewater in the first collecting barrel 81 is at the first high liquid point 85, the first control unit controls the wastewater input pipe 1 to stop transporting wastewater into the first collecting barrel 81.

[0081] Preferably, a first overflow port 86 is provided above the first high liquid point 85 , and when the wastewater in the first collecting barrel 81 reaches the first overflow port 86 , the wastewater flows out of the first collecting barrel 81 from the first overflow port 86 , so as to control the amount of wastewater in the first collecting barrel 81 .

[0082] Preferably, a first drain low valve is provided at the bottom end of one side of the first collecting barrel 81 to drain the waste water in the first collecting barrel 81 .

[0083] Preferably, the water inlet pump 82 includes a main water inlet pump and a backup water inlet pump.

[0084] Preferably, the three-phase separation device 2 is provided with a pre-filter 9 and an evaporator raw water barrel 10, the pre-filter 9 is located between the wastewater input pipeline 1 and the three-phase separation device 2, and the pre-filter 9 is used to pre-treat the wastewater; the evaporator raw water barrel 10 is located between the three-phase separation device 2 and the evaporation device 3, and the clear liquid in the three-phase separation device 2 flows into the evaporation device 3 through the evaporator raw water barrel 10; the water-soluble floating oil removed by the ceramic membrane filter 6 flows back to the evaporator raw water barrel 10.

[0085] Preferably, a second control unit is provided on the evaporator raw water barrel 10; a second low liquid point 101, a second middle liquid point 102 and a second high liquid point 103 are provided in the evaporator raw water barrel 10; when the wastewater in the evaporator raw water barrel 10 is located at the second middle liquid point 102, the second control unit controls the low-temperature evaporator 31 to start liquid intake; when the wastewater in the evaporator raw water barrel 10 is located at the second low liquid point 101, the second control unit controls the low-temperature evaporator 31 to stop liquid intake; when the wastewater in the evaporator raw water barrel 10 is located at the second high liquid point 103, the second control unit controls the three-phase separation device 2 to stop transporting wastewater into the evaporator raw water barrel 10.

[0086] A second overflow port 104 is provided above the second high liquid point 103 . When the wastewater in the evaporator raw water barrel 10 reaches the second overflow port 104 , the wastewater flows out of the evaporator raw water barrel 10 from the second overflow port 104 , so as to control the amount of wastewater in the evaporator raw water barrel 10 .

[0087] Preferably, a second low emptying valve 105 is provided at the bottom end of one side of the evaporator raw water barrel 10 to empty the waste water in the evaporator raw water barrel 10 .

[0088] Preferably, the three-phase separation device 2 comprises a sedimentation tank, a solid-liquid separation tank, an oil-liquid separation tank and a liquid collection tank connected in sequence;

[0089] The sedimentation tank is used to precipitate large particles of impurities in the wastewater;

[0090] The solid-liquid separation tank is provided with an inclined sedimentation element and an adsorption element, wherein the inclined sedimentation element blocks small particle impurities suspended in the wastewater, and the adsorption element adsorbs impurities in the wastewater;

[0091] The oil-liquid separation tank is used to control the flow rate of wastewater to separate the floating oil and cutting fluid in the wastewater, and automatically accumulate and discharge the floating oil;

[0092] The wastewater flow rate is 0.5 m / h.

[0093] The liquid collecting tank is used to collect impurities filtered out in the sedimentation tank and the solid-liquid separation tank, and floating oil separated in the oil-liquid separation tank.

[0094] Preferably, the liquid collecting tank is connected to the concentrated liquid collecting device 5 , and the impurities and floating oil collected in the liquid collecting tank are to be subsequently processed or discharged into the concentrated liquid collecting device 5 .

[0095] Preferably, the low-temperature evaporator 31 includes an evaporator, a compressor, a refrigerant, an expansion valve, a water tank and a sensor; the inlet of the evaporator receives the clear liquid produced by the three-phase separation device 2, the steam outlet of the evaporator is connected to the water tank, and a heat exchanger is provided between the steam outlet and the water tank; the water tank is connected to the ceramic membrane filter 6, and the liquid outlet of the evaporator is connected to the concentrated liquid collection device 5; the compressor is used to compress the refrigerant to generate heat to evaporate the water quickly; the expansion valve is used to absorb heat from the liquid to gaseous state of the refrigerant to quickly condense and liquefy the steam. The refrigerant generates heat in the evaporator to heat the wastewater; the refrigerant absorbs heat in the heat exchanger to condense the wastewater vapor; the sensor is used to detect bubbles in the evaporation process.

[0096] Preferably, the evaporation tank is in vacuum, and the evaporation temperature of the low-temperature evaporator 31 is 35-40°C.

[0097] In the above, the evaporation and concentration process of the clear liquid in the low-temperature evaporator 31 is as follows: the evaporation tank is automatically filled with water after being evaporating to a vacuum state, and the compressor generates heat to heat the wastewater in the evaporation tank. Under the vacuum state, the wastewater temperature rises to 36-38°C, the wastewater begins to evaporate, and the preheating is completed; the evaporation temperature is set, the compressor compresses the refrigerant to the evaporation temperature, and while the water evaporates rapidly, the refrigerant absorbs heat after being vaporized by the expansion valve to refrigerate, and the steam rises and enters the water storage tank after being cooled and liquefied. The refrigerant absorbs heat and is compressed and heated by the compressor to reheat the wastewater. If the sensor detects that bubbles are rising during the evaporation process, the cleaning barrel 32 provides cleaning liquid to the low-temperature evaporator 31. When the evaporation and concentration are completed, the water storage tank discharges distilled water to the ceramic membrane filter 6, and the evaporation tank discharges the concentrated liquid to the concentrated liquid collection device 5.

[0098] Preferably, the cleaning liquid disposed in the cleaning barrel 32 includes a defoaming agent. After the sensor detects that bubbles are rising during the evaporation process, the cleaning barrel 32 provides the defoaming agent to the low-temperature evaporator 31 for defoaming.

[0099] Preferably, the ceramic membrane filter 6 includes a circulating water tank, a circulating water pump, and a ceramic membrane assembly; the inlet of the circulating water tank is connected to the low-temperature evaporator 31, the outlet of the circulating water tank is connected to the inlet of the circulating water pump, and the outlet of the circulating water pump is connected to the ceramic membrane assembly.

[0100] In the above, the operation process of the ceramic membrane filter 6 is as follows: the distilled water produced by the low-temperature evaporator 31 flows to the circulating water tank, the outlet of the circulating water tank is connected to the circulating water pump, the outlet of the circulating water pump is connected to the ceramic membrane assembly, the water-soluble floating oil produced by the ceramic membrane assembly flows back to the circulating water tank, and the filtered wastewater produced by the ceramic membrane assembly flows to the molecular sieve COD filter 7. The circulating water tank is regularly emptied into the evaporator raw water bucket 10 by setting the operating time.

[0101] Preferably, the ceramic membrane flux is 100LMH, the operating membrane surface flow rate is 4m / s, and the membrane cleaning flow rate is 2m / s.

[0102] Preferably, a molecular sieve liquid inlet barrel 11 is arranged between the molecular sieve COD filter 7 and the ceramic membrane filter 6, and a third control unit is arranged at the molecular sieve liquid inlet barrel 11; a third low liquid point 111, a third middle liquid point 112 and a third high liquid point 113 are arranged in the molecular sieve liquid inlet barrel 11.

[0103] Preferably, when the wastewater in the molecular sieve inlet barrel 11 is located at the third middle liquid point 112, the third control unit controls the molecular sieve COD filter 7 to start; when the wastewater in the molecular sieve inlet barrel 11 is located at the third low liquid point 111, the third control unit controls the molecular sieve COD filter 7 to stop inletting liquid; when the wastewater in the molecular sieve inlet barrel 11 is located at the third high liquid point 113, the third control unit controls the ceramic membrane filter 6 to stop transporting wastewater into the molecular sieve inlet barrel 11.

[0104] Preferably, a third overflow port 114 is provided above the third high liquid point 113 , and when the wastewater in the molecular sieve inlet barrel 11 reaches the third overflow port 114 , the wastewater flows out of the molecular sieve inlet barrel 11 from the third overflow port 114 , so as to control the amount of wastewater in the evaporator raw water barrel 10 .

[0105] Preferably, a third drain low valve 115 is provided at the bottom end of one side of the molecular sieve liquid inlet barrel 11 to drain the waste water in the molecular sieve liquid inlet barrel 11 .

[0106] Preferably, the molecular sieve COD filter 7 includes a regeneration device 71 and several molecular sieve filter tanks 72 for filtering wastewater, and the several molecular sieve filter tanks 72 operate alternately between main filtering operation, auxiliary filtering operation and in-situ regeneration operation. The molecular sieve filter tanks 72 are provided with molecular sieve filter material, and the regeneration device 71 is used to clean and regenerate the molecular sieve filter material.

[0107] Preferably, the regeneration device 71 includes a steam generator, which introduces steam into the filter tank to regenerate and clean the inside of the filter tank, and the cleaning water generated during the regeneration and cleaning process flows into the concentrated water collection device.

[0108] Preferably, the number of the filter tanks is 3, wherein the molecular sieve filter tank 72 for filtering wastewater includes a main filter tank 73 for performing main filtering operations, an auxiliary filter tank 74 for performing auxiliary filtering operations, and a regeneration filter tank 75 for performing in-situ regeneration operations; the molecular sieve filter tank 72 is controlled to perform main filtering operations, auxiliary filtering operations, and in-situ regeneration operations alternately.

[0109] Preferably, when the timing or quantitative standard is reached, the control device switches the main filter tank 73 to perform in-situ regeneration operation, switches the auxiliary filter tank 74 to the main filter tank 73 for main filtering operation, and switches the filter tank performing in-situ regeneration operation to the auxiliary filter tank 74 for auxiliary filtering operation.

[0110] Preferably, the molecular sieve filter material comprises an organic polymer copolymer mainly composed of a polymer organic material, wherein the polymer organic material comprises styrene and divinylbenzene, and the specific surface area of ​​the molecular sieve filter material is 450 to 600 m 2 / g.

[0111] Preferably, the water inlet pressure of the molecular sieve filter tank 72 is 5 bar, and the water inlet flow rate is 4 BV / h.

[0112] Preferably, it also includes an anti-pollution membrane filtration system 12, which is arranged at the outlet of the molecular sieve COD filter 7. The anti-pollution membrane filtration system 12 and the molecular sieve COD filter 7 are circulated and connected through a pipeline to circulate and concentrate the anti-pollution membrane concentrated liquid produced by the anti-pollution membrane filtration system. The anti-pollution membrane filtration system 12 includes a security filter and an anti-pollution membrane.

[0113] Preferably, the material of the anti-pollution membrane includes fully aromatic high-crosslinked polyamide, and the flux of the anti-pollution membrane is 18LMH.

[0114] Preferably, the security filter is arranged at the inlet of the anti-pollution membrane to protect the anti-pollution membrane.

[0115] Preferably, the anti-fouling membrane system has a built-in concentrated water circulation pipeline, and the purpose of flushing the anti-fouling membrane with a large flow rate and reducing the risk of clogging of the membrane system is achieved by controlling the internal circulation ratio of concentrated water.

[0116] Preferably, the internal circulation ratio of the concentrated water in the concentrated water circulation pipeline is 60%.

[0117] Preferably, a second collecting barrel 13 is provided between the anti-pollution membrane filtration system 12 and the molecular sieve COD filter 7, and a fourth control unit is provided at the second collecting barrel 13; a fourth low liquid point 131, a fourth middle liquid point 132 and a fourth high liquid point 133 are provided in the second collecting barrel 13.

[0118] Preferably, when the wastewater in the second collection barrel 13 is at the fourth middle liquid point 132, the fourth control unit controls the anti-pollution membrane filtration system 12 to start; when the wastewater in the second collection barrel 13 is at the fourth low liquid point 131, the fourth control unit controls the anti-pollution membrane filtration system 12 to stop running; when the wastewater in the second collection barrel 13 is at the fourth high liquid point 133, the fourth control unit controls the molecular sieve COD filter 7 to stop running.

[0119] Preferably, a fourth overflow port 134 is provided above the fourth intermediate liquid point 132 , and when the wastewater in the second collecting barrel 13 reaches the fourth overflow port 134 , clean water flows out of the second collecting barrel 13 from the fourth overflow port 134 , so as to control the amount of wastewater in the second collecting barrel 13 .

[0120] Preferably, a fourth drain low valve 135 is provided at the bottom end of one side of the second collecting barrel 13 to drain the waste water in the second collecting barrel 13 .

[0121] Preferably, the water outlet of the anti-pollution membrane filtration system 12 is also provided with a water production barrel 14, and the water production barrel 14 is used to collect the clean water after filtration. The water production barrel 14 is provided with a fifth high liquid point 15. When the clean water in the water production barrel 14 is at the fifth high liquid point 15, the anti-pollution membrane filtration system 12 is controlled to stop running.

[0122] Embodiment 2

[0123] This embodiment is implemented on the basis of the above-mentioned embodiment 1, and the similarities with the above-mentioned embodiment are not repeated here.

[0124] This embodiment relates to a method for treating mechanical processing wastewater, using the mechanical processing wastewater treatment equipment described above, and comprising the following steps:

[0125] S1. Wastewater enters the three-phase separation device through the wastewater input pipeline, and produces clear liquid and floating oil after being treated by the three-phase separation device. The clear liquid is transported to the evaporation device, and the floating oil flows into the concentrated liquid collection device;

[0126] S2. The low-temperature evaporator in the evaporation device evaporates the clear liquid from the three-phase separation device to produce distilled water and evaporation concentrate after evaporation. The evaporation concentrate enters the concentrate collection device, and the distilled water passes into the ceramic membrane filter;

[0127] S3, the ceramic membrane filter removes the water-soluble floating oil in the distilled water, and the water-soluble floating oil flows back to the evaporation device; the wastewater filtered by the ceramic membrane filter flows to the molecular sieve COD filter;

[0128] S4, molecular sieve COD filter is used to filter the wastewater filtered by the ceramic membrane filter, generating clean water and filtered concentrate after filtration, and the filtered concentrate enters the concentrated liquid collection device; the obtained clean water is discharged in compliance with the standards or collected for reuse.

[0129] Embodiment 3

[0130] This embodiment is implemented on the basis of the above-mentioned embodiment 1, and the similarities with the above-mentioned embodiment 1 are not repeated here.

[0131] In this embodiment, the relevant parameters of the molecular sieve COD filter operation include adsorption amount, adsorption rate, desorption amount, desorption time, and desorption rate. Among them:

[0132] Adsorption capacity: mainly depends on the loading capacity and adsorption time of molecular sieve in the molecular sieve COD filter. Under the same adsorption time conditions, the more loading capacity, the greater the adsorption capacity; under the same loading capacity conditions, the longer the adsorption time, the greater the adsorption capacity.

[0133] Adsorption rate: mainly depends on the pollutant concentration in the wastewater. The higher the pollutant concentration, the faster the adsorption rate.

[0134] Desorption amount: mainly depends on the adsorption amount and desorption time of the molecular sieve. Under the same desorption time conditions, the more adsorption amount, the more desorption amount; under the same adsorption amount conditions, the longer the desorption time, the more desorption amount.

[0135] Desorption rate: mainly depends on the adsorption amount of the molecular sieve. The more the adsorption amount, the faster the desorption rate.

[0136] Based on the above logic, the molecular sieve COD filter needs to balance the above parameters during operation to achieve the optimal operating conditions.

[0137] The adsorption capacity of the molecular sieve used in this embodiment is 15-20 g / L.

[0138] The adsorption rate of the molecular sieve COD filter in one filtration is between 90% and 20%, which gradually decreases with the adsorption process, and the average value within a single adsorption cycle is 80%.

[0139] The desorption rate of the molecular sieve COD filter is between 90% and 20%, which gradually decreases during the desorption process. The average value in a single desorption cycle is 80%.

[0140] This example takes the wastewater input pipeline of 1 ton per day and the pollutant concentration of 100 mg / L as an example, that is, the pollutant is 100g. The molecular sieve COD filter regeneration cycle is designed to be 1 day, that is, 100g of pollutants need to be adsorbed every day, that is, 5L of molecular sieve filter material is theoretically required. Since the engineering project also needs to consider the stability and design margin of the system, a 10L molecular sieve filter material is designed.

[0141] When the evaporated distilled water is filtered through the molecular sieve COD filter at one time:

[0142] The pollutant concentration of the influent is 100mg / L, and the pollutant concentration of the produced water is 20mg / L. At this time, the total amount of adsorbed pollutants is 20g, and the utilization rate of the molecular sieve is 80%. The equipment enters the standby state.

[0143] The evaporated distilled water passes through the molecular sieve COD filter and the anti-pollution membrane filtration system and then circulates into the molecular sieve COD filter for filtration:

[0144] The pollutant concentration of the influent in one cycle is 100 mg / L, and the pollutant concentration of the produced water is 20 mg / L. At this time, the total amount of adsorbed pollutants is 80g, and the utilization rate of the molecular sieve is 80%.

[0145] The pollutant concentration of the secondary circulation influent is 20 mg / L, the adsorption rate is reduced to 50%, and the pollutant concentration of the produced water is 10 mg / L. At this time, the total amount of adsorbed pollutants is 90g, and the utilization rate of the molecular sieve is 90%.

[0146] In this cycle, the pollutant concentration of the produced water will approach 0, the total amount of adsorbed pollutants will approach 100g, and the utilization rate of the molecular sieve will approach 100%.

[0147] Similarly, during the desorption phase:

[0148] The molecular sieve in the state of single filtration has an adsorption capacity of 80g, a desorption rate of 70%, and 56g of pollutants in the desorption liquid; the molecular sieve in the state of circulating filtration has an adsorption capacity of 100g, a desorption rate of 90%, and 90g of pollutants in the desorption liquid.

[0149] Therefore, by adding an anti-pollution membrane filtration system to return the anti-pollution membrane concentrate to the evaporation device and then enter the COD filter for circulation filtration, the adsorption efficiency and desorption efficiency of the molecular sieve can be effectively improved without changing the parameters of the molecular sieve COD filter.

[0150] Comparative Example 1

[0151] The wastewater treatment processes adopted in this comparative example are oil separation, demulsification, flotation, Fenton oxidation, anaerobic reaction, aerobic reaction, MBR membrane and reverse osmosis membrane, and the main treatment principle is the oxidation and biodegradation of organic matter.

[0152] Wastewater with a COD concentration of 40,000 mg / L was introduced into Example 1 and Comparative Example 1 for wastewater treatment. The results after treatment are shown in Table 1 below.

[0153] Table 1

[0154]

[0155] It can be clearly seen from Table 1 above that the wastewater treatment method used in Example 1 has a higher treatment efficiency than that used in Comparative Example 1, and the wastewater treatment equipment occupies a smaller area, has a better wastewater treatment effect, and significantly reduces the effluent COD concentration.

[0156] Comparative Example 2

[0157] The difference between this comparative example and Example 1 is that the evaporator used in the evaporation device in the wastewater treatment process adopted in this comparative example is replaced by MVR evaporation, and the evaporation temperature is 80-90°C.

[0158] Wastewater with a COD concentration of 40,000 mg / L was introduced into Example 1 and Comparative Example 2 for wastewater treatment. The results after treatment are shown in Table 2 below.

[0159] Table 2

[0160]

[0161] It can be clearly seen from the above table that compared with the wastewater treatment method adopted in Comparative Example 2, Example 1 has a higher evaporation treatment efficiency, requires less frequent evaporator cleaning, has a longer evaporator service life, and generates less cleaning liquid, which effectively reduces water waste and improves filtration efficiency and filtration accuracy.

[0162] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical processing wastewater treatment equipment, characterized in that: connected to the wastewater input pipeline, including a three-phase separation device, an evaporation device, a filtering device and a concentrated liquid collecting device connected in sequence; The wastewater input pipeline is connected to a three-phase separation device, and the three-phase separation device separates the wastewater into oil and water, and the separated floating oil enters the concentrated liquid collection device, and the clear liquid enters the evaporation device; The evaporation device is used to evaporate the clear liquid from the three-phase separation device, and the evaporation device includes a low-temperature evaporator and a cleaning bucket; the cleaning bucket is used to provide cleaning liquid to the low-temperature evaporator, and the low-temperature evaporator evaporates the waste water at a low temperature to produce distilled water and evaporation concentrate, the evaporation concentrate enters the concentrate collection device, and the distilled water passes into the filtering device; The filtering device comprises a ceramic membrane filter and a molecular sieve COD filter, wherein the water inlet of the ceramic membrane filter is connected to the low-temperature evaporator, and the water outlet of the ceramic membrane filter is connected to the molecular sieve COD filter; Ceramic membrane filters are used to remove water-soluble floating oil from distilled water; The molecular sieve COD filter is used to filter the wastewater filtered by the ceramic membrane filter, generating clean water and filtered concentrate after filtration. The filtered concentrate enters the concentrated liquid collection device, and the clean water meets the standards for discharge or collection and reuse.

2. A mechanical processing wastewater treatment equipment according to claim 1, characterized in that: A wastewater collecting tank is arranged between the wastewater input pipeline and the three-phase separation device, and the wastewater collecting tank includes a first collecting barrel, a water inlet pump and a first control unit; a first low liquid point, a first middle liquid point and a first high liquid point are arranged in the first collecting barrel.

3. The mechanical processing wastewater treatment equipment according to claim 1 is characterized in that: The three-phase separation device is provided with a pre-filter and an evaporator raw water barrel. The pre-filter is located between the wastewater input pipeline and the three-phase separation device, and the pre-filter is used to pre-treat the wastewater; the evaporator raw water barrel is located between the three-phase separation device and the evaporation device, and the clear liquid in the three-phase separation device flows into the evaporation device through the evaporator raw water barrel; the water-soluble floating oil removed by the ceramic membrane filter flows back to the evaporator raw water barrel.

4. The mechanical processing wastewater treatment equipment according to claim 1 is characterized in that: The three-phase separation device comprises a sedimentation tank, a solid-liquid separation tank, an oil-liquid separation tank and a liquid collection tank connected in sequence; The sedimentation tank is used to precipitate large particles of impurities in the wastewater; The solid-liquid separation tank is provided with an inclined sedimentation element and an adsorption element, wherein the inclined sedimentation element blocks small particle impurities suspended in the wastewater, and the adsorption element adsorbs impurities in the wastewater; The oil-liquid separation tank is used to control the wastewater flow rate to be no more than 0.5 m / h, so as to separate the floating oil and cutting fluid in the wastewater into layers, and automatically accumulate and discharge the floating oil; The liquid collecting tank is used to collect impurities filtered out in the sedimentation tank and the solid-liquid separation tank, and floating oil separated in the oil-liquid separation tank.

5. The mechanical processing wastewater treatment equipment according to claim 1 is characterized in that: The low-temperature evaporator includes an evaporator, a compressor, a refrigerant, an expansion valve, a water storage tank and a sensor; the inlet of the evaporator receives the clear liquid produced by the three-phase separation device, the steam outlet of the evaporator is connected to the water storage tank, and a heat exchanger is provided between the steam outlet and the water storage tank; the water storage tank is connected to a ceramic membrane filter, and the liquid outlet of the evaporator is connected to a concentrated liquid collecting device; the compressor is used to compress the refrigerant to generate heat to evaporate the water quickly; the expansion valve is used to absorb heat during the conversion of the refrigerant from liquid to gas, so that the steam is quickly condensed and liquefied; the refrigerant releases heat in the evaporator to heat the wastewater; the refrigerant absorbs heat in the heat exchanger to condense the wastewater vapor; the sensor is used to detect bubbles in the evaporation process.

6. The mechanical processing wastewater treatment equipment according to claim 1, characterized in that: The ceramic membrane filter comprises a circulating water tank, a circulating water pump and a ceramic membrane assembly; the inlet of the circulating water tank is connected to the low-temperature evaporator, the outlet of the circulating water tank is connected to the inlet of the circulating water pump, and the outlet of the circulating water pump is connected to the ceramic membrane assembly.

7. The mechanical processing wastewater treatment equipment according to claim 1 is characterized in that: A molecular sieve liquid inlet barrel is arranged between the molecular sieve COD filter and the ceramic membrane filter, and a third control unit is arranged at the molecular sieve liquid inlet barrel; a third low liquid point, a third middle liquid point and a third high liquid point are arranged in the molecular sieve liquid inlet barrel.

8. The mechanical processing wastewater treatment equipment according to claim 1, characterized in that: The molecular sieve COD filter includes a regeneration device and several molecular sieve filter tanks for filtering wastewater, wherein the several molecular sieve filter tanks operate alternately between main filtering operation, auxiliary filtering operation and in-situ regeneration operation, wherein the molecular sieve filter tanks are provided with molecular sieve filter material, and the regeneration device is used for cleaning and regenerating the molecular sieve filter material.

9. The mechanical processing wastewater treatment equipment according to claim 1, characterized in that: It also includes an anti-pollution membrane filtration system, which is arranged at the outlet of the molecular sieve COD filter. The anti-pollution membrane filtration system and the molecular sieve COD filter are circulated and connected through a pipeline to circulate and concentrate the anti-pollution membrane concentrated liquid produced by the anti-pollution membrane filtration system. The anti-pollution membrane filtration system includes a security filter and an anti-pollution membrane.

10. A method for treating mechanical processing wastewater, characterized in that: The mechanical processing wastewater treatment equipment according to any one of claims 1 to 9 comprises the following steps: S1. Wastewater enters the three-phase separation device through the wastewater input pipeline, and produces clear liquid and floating oil after being treated by the three-phase separation device. The clear liquid is transported to the evaporation device, and the floating oil flows into the concentrated liquid collection device; S2. The low-temperature evaporator in the evaporation device evaporates the clear liquid from the three-phase separation device to produce distilled water and evaporation concentrate after evaporation. The evaporation concentrate enters the concentrate collection device, and the distilled water passes into the ceramic membrane filter; S3, the ceramic membrane filter removes the water-soluble floating oil in the distilled water, and the water-soluble floating oil flows back to the evaporation device; the wastewater filtered by the ceramic membrane filter flows to the molecular sieve COD filter; S4, molecular sieve COD filter is used to filter the wastewater filtered by the ceramic membrane filter, generating clean water and filtered concentrate after filtration, and the filtered concentrate enters the concentrated liquid collection device; the obtained clean water is discharged in compliance with the standards or collected for reuse.

Images