Refrigeration oil wastewater comprehensive treatment and discharge system

Abstract

The utility model relates to a comprehensive treatment and discharge system for refrigeration oil wastewater, including a high-concentration oily wastewater regulating module, an acidification oil separation module, a comprehensive regulating module, a combined flotation treatment module, a hydrolysis acidification treatment module, an anaerobic treatment module, an aerobic treatment module, a water quality monitoring module, a dosing module, a waste oil collection module, a sludge collection module and an air blowing module. Through scientific and reasonable module design, each module cooperates with each other to achieve efficient wastewater treatment and effective resource recovery, providing strong support for environmental protection and sustainable development of the refrigeration oil production industry.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a refrigeration oil wastewater comprehensive treatment and discharge system. Background Art

[0002] Refrigeration oil plays a vital role in the refrigeration industry, especially for lubricating the moving parts inside the refrigeration compressor. With the continuous advancement of refrigeration technology and the upgrading of refrigerant products, the demand for refrigeration oil production is also growing. However, a large amount of wastewater is generated during the production process of refrigeration oil, which mainly comes from the production process and cleaning process.

[0003] Although the volume of production process wastewater is relatively small, its composition is complex and contains a variety of oil substances dissolved in water. The oil content and chemical oxygen demand (COD) in these wastewaters are very high, and sometimes the COD concentration can reach tens of thousands of milligrams per liter, which poses a serious threat to the environment. On the other hand, the volume of cleaning wastewater is large, and although its oil content and COD are relatively low, it still has significant pollution potential, and the COD concentration can reach thousands of milligrams per liter.

[0004] At present, the commonly used technologies for treating oily wastewater include oil separation, flotation, biochemical treatment and advanced oxidation. However, these methods have limitations when used alone. The oil separation method mainly uses the density difference between oil and water for separation, which is effective for removing floating oil, but is not suitable for other forms of oil substances. The flotation method achieves oil-water separation through the adhesion of tiny bubbles, and is more suitable for treating suspended oil or emulsified oil. The biochemical treatment method relies on the degradation of microorganisms, so it is only effective for biodegradable dissolved oil. Although the advanced oxidation method has deep treatment capabilities when treating high-concentration oily wastewater, the economic cost is high and it is not suitable for large-scale application.

[0005] In summary, due to the complexity of refrigeration oil production wastewater and the limitations of the single application of existing treatment technologies, it is crucial to develop a system that can comprehensively treat this type of wastewater. Such a system needs to be able to efficiently remove various oil substances in the wastewater and reduce the COD concentration to achieve environmentally friendly discharge of wastewater. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present application aims to provide an improved refrigeration oil wastewater comprehensive treatment and discharge system, which can treat oily wastewater in a highly efficient manner, reduce the concentration of pollutants, so as to achieve environmentally friendly discharge of part of the wastewater, while realizing the reuse of part of the wastewater and promoting clean production of enterprises.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] The present application provides a comprehensive treatment and discharge system for refrigeration oil wastewater, comprising:

[0009] A high-concentration oily wastewater regulating module, which is connected to a high-concentration oily wastewater production workshop and is used to collect high-concentration oily wastewater discharged from the high-concentration oily wastewater production workshop and regulate the water quality and quantity of the high-concentration oily wastewater;

[0010] an acid precipitation oil separation module, wherein the water inlet of the acid precipitation oil separation module is connected to the water outlet of the high-concentration oily wastewater regulating module, and is used to collect the high-concentration oily wastewater discharged from the high-concentration oily wastewater regulating module, and to precipitate and remove dissolved oil in the high-concentration oily wastewater;

[0011] A comprehensive regulating module, wherein the water inlet of the comprehensive regulating module is connected to the water outlet of the acid separation and oil separation module, and is used to collect the oily wastewater discharged from the acid separation and oil separation module, and regulate the water quality and quantity of the oily wastewater;

[0012] A combined air flotation treatment module, the water inlet of the combined air flotation treatment module is connected to the water outlet of the comprehensive regulation module, and is used to collect the oily wastewater discharged from the comprehensive regulation module, and to precipitate and remove the suspended oil and emulsified oil in the oily wastewater;

[0013] A hydrolysis and acidification treatment module, the water inlet of the hydrolysis and acidification treatment module is connected to the water outlet of the combined air flotation treatment module, and is used to collect the oily wastewater discharged from the combined air flotation treatment module and improve the biodegradability of the oily wastewater;

[0014] An anaerobic treatment module, wherein the water inlet of the anaerobic treatment module is connected to the water outlet of the hydrolysis and acidification treatment module, and is used to collect biodegradable oily wastewater discharged from the hydrolysis and acidification treatment module, and perform anaerobic treatment to remove pollutants;

[0015] an aerobic treatment module, wherein the water inlet of the aerobic treatment module is connected to the water outlet of the anaerobic treatment module, and is used to collect wastewater discharged from the anaerobic treatment module and perform aerobic treatment to remove pollutants;

[0016] A water quality monitoring module, wherein the water inlet of the water quality monitoring module is connected to the water outlet of the aerobic treatment module, and is used to collect wastewater discharged from the aerobic treatment module and monitor it for subsequent treatment;

[0017] A dosing module, the dosing module is connected to the acid precipitation oil separation module and the combined flotation treatment module respectively, so as to add drugs to the acid precipitation oil separation module and the combined flotation treatment module;

[0018] A waste oil collection module, the water inlet of which is connected to the acid separation oil separation module, and is used to collect floating oil discharged from the acid separation oil separation module;

[0019] A sludge collection module, wherein the water inlet of the sludge collection module is respectively connected to the combined flotation treatment module, the anaerobic treatment module, and the aerobic treatment module, and is used to collect the sludge discharged by the combined flotation treatment module, the anaerobic treatment module, and the aerobic treatment module;

[0020] A blast module, wherein the blast module is respectively connected to the high-concentration oily wastewater regulating module, the comprehensive regulating module, the hydrolysis acidification treatment module and the aerobic treatment module, so as to blow air into the high-concentration oily wastewater regulating module, the comprehensive regulating module, the hydrolysis acidification treatment module and the aerobic treatment module.

[0021] As a further improvement of the present application, the acid separation oil separation module includes a dissolved oil precipitation unit and an oil scraping treatment unit. The dissolved oil precipitation unit is connected to the sulfuric acid storage tank in the dosing module to fully mix the sulfuric acid with the high-concentration oily wastewater. A first scraper is provided above the oil scraping treatment unit to scrape off the precipitated floating oil.

[0022] As a further improvement of the present application, the dissolved oil precipitation unit and the oil scraping treatment unit are connected at the bottom, and the high-concentration oily wastewater flows from the dissolved oil precipitation unit into the oil scraping treatment unit in sequence by overflow.

[0023] As a further improvement of the present application, a sloped partition guide plate is provided in the oil scraping treatment unit and adjacent to the position where the dissolved oil precipitation unit is connected to the bottom of the oil scraping treatment unit.

[0024] As a further improvement of the present application, the combined flotation treatment module includes a dosing unit and a scum treatment unit, the dosing unit is connected to the bottom of the scum treatment unit, the oily wastewater enters the scum treatment unit from the dosing unit by overflow, and a second scraper is provided on the top of the scum treatment unit for scraping off the generated scum.

[0025] As a further improvement of the present application, the hydrolysis and acidification treatment module includes a suspended suspended bed unit for accommodating hydrolysis and acidification bacteria and a pulse water distributor unit arranged above the suspended bed.

[0026] As a further improvement of the present application, the anaerobic treatment module includes an anaerobic mixing unit, an anaerobic reaction unit and a first sedimentation unit. The anaerobic mixing unit is connected to the outlet of the hydrolysis and acidification treatment module, and is used to receive the oily wastewater discharged from the hydrolysis and acidification treatment module and adjust the water quality and quantity. The anaerobic reaction unit is used to receive the wastewater discharged from the anaerobic mixing unit and perform anaerobic bacteria treatment to remove pollutants. The first sedimentation unit is used to receive the wastewater discharged from the anaerobic reaction unit and perform sedimentation treatment. The first sedimentation unit is also connected to the sludge collection module and the anaerobic mixing unit, so as to discharge sludge into the sludge collection module and supplement part of the anaerobic sludge into the anaerobic mixing unit.

[0027] As a further improvement of the present application, the aerobic treatment module includes an aerobic reaction unit and a second sedimentation unit. The aerobic reaction unit receives the wastewater discharged from the anaerobic treatment module and performs aerobic treatment to remove pollutants. The second sedimentation unit is used to receive the wastewater discharged from the aerobic reaction unit and perform sedimentation treatment. The second sedimentation unit is also connected to a sludge collection module to discharge residual sludge to the sludge collection module and supplement part of the aerobic sludge to the front end of the aerobic reaction unit.

[0028] As a further improvement of the present application, it also includes a deep processing module, the water inlet of the deep processing module is connected to the water outlet of the water quality monitoring module, the deep processing module includes an ozone catalytic oxidation treatment unit, an aerated biological filter treatment unit, a clean water storage unit, and an ozone generating unit, the water outlet of the ozone catalytic oxidation treatment unit is connected to the water inlet of the aerated biological filter treatment unit, the water outlet of the aerated biological filter treatment unit is connected to the water inlet of the clean water storage unit, the ozone catalytic oxidation treatment unit and the aerated biological filter treatment unit are used to further reduce the difficult-to-degrade organic matter in the wastewater discharged from the water quality monitoring module, the water outlet of the clean water storage unit is connected to the production workshop for conveying treated clean water to the production workshop, and the ozone generating unit is connected to the ozone catalytic oxidation treatment unit for conveying ozone to the ozone catalytic oxidation treatment unit.

[0029] As a further improvement of the present application, it also includes a filter press module, which is connected to the sludge collection module and is used for filter pressing the sludge discharged from the sludge collection module.

[0030] The beneficial effect of the present application is that the comprehensive treatment and discharge system for refrigeration oil wastewater of the present application successfully solves a number of technical problems in the treatment of refrigeration oil wastewater by integrating a variety of advanced technologies for coordinated treatment, and shows significant beneficial effects:

[0031] 1) Technical synergy to deal with complex water quality: The water quality of refrigeration oil wastewater is complex and changeable, and traditional single treatment technology is often difficult to deal with. This application integrates multiple technologies to form a synergistic treatment effect, effectively dealing with complex water quality issues. This synergistic treatment method not only improves treatment efficiency, but also ensures the stability and reliability of the treatment effect.

[0032] 2) Pretreatment system to reduce COD and recycle waste oil: This application specifically sets up an acid precipitation and oil removal pretreatment system for production process wastewater (i.e., high-concentration oily wastewater). This system can not only effectively reduce the COD of wastewater to an appropriate range, but more importantly, it can also achieve the recycling and reuse of waste oil. This not only reduces the environmental burden, but also brings additional economic benefits to the enterprise, achieving a win-win situation for environmental protection and economy.

[0033] 3) Full biochemical process, energy saving and environmental protection: The main process section of this application adopts the full biochemical process. This choice avoids the use of a large amount of chemical agents, thereby significantly reducing the risk of secondary pollution. The full biochemical process mainly consumes electricity, which not only achieves efficient treatment of wastewater, but also greatly reduces the treatment cost of refrigeration oil wastewater while ensuring compliance with emission standards, saving considerable operating costs for the company.

[0034] 4) Deep treatment to promote water resource recycling: This system is also equipped with a deep treatment unit. This design enables some wastewater to meet the standards for workshop reuse after deep treatment. This not only promotes clean production within the enterprise, but also effectively saves precious water resources, which is in line with the current concept of sustainable development.

[0035] In summary, the comprehensive treatment and discharge system for refrigeration oil wastewater of the present application achieves a perfect combination of high efficiency, economy and environmental protection in wastewater treatment through the comprehensive application of technical collaboration, pretreatment system, full biochemical process and deep treatment unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a comprehensive treatment and discharge system for refrigeration oil wastewater according to an embodiment of the present application;

[0037] Figure 2 This is a partial structural schematic diagram of a comprehensive treatment and discharge system for refrigeration oil wastewater according to an embodiment of the present application.

[0038] In the figure: 1. High-concentration oily wastewater regulation module; 2. Acidification and oil separation module; 21. Dissolved oil precipitation unit; 22. Oil scraping treatment unit; 3. Comprehensive regulation module; 4. Combined flotation treatment module; 41. Dosing unit; 42. Scum treatment unit; 5. Hydrolysis and acidification treatment module; 51. Suspended bed unit; 52. Pulse water distributor unit; 6. Anaerobic treatment module; 61. Anaerobic preparation unit; 62. Anaerobic reaction unit; 63. First sedimentation unit; 7. Aerobic treatment module; 71. Aerobic reaction unit; 72. Second sedimentation unit; 8. Water quality monitoring module; 9. Dosing module; 10. Waste oil collection module; 11. Sludge collection module; 12. Deep treatment module; 121. Ozone catalytic oxidation treatment unit; 122. Aerated biological filter treatment unit; 123. Clean water storage unit; 124. Ozone generation unit; 13. Filter press module; 14. Blowing module. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in combination with the specific embodiments and drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments, and are not used to limit the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0040] The present application provides a comprehensive treatment and discharge system for refrigeration oil wastewater, such as Figure 1 As shown, it includes a high-concentration oily wastewater regulating module 1, an acidification oil separation module 2, a comprehensive regulating module 3, a combined flotation treatment module, a hydrolysis acidification treatment module 5, an anaerobic treatment module 6, an aerobic treatment module 7, a water quality monitoring module 8, a dosing module 9, a waste oil collection module 10, a sludge collection module 11 and a blast module 14, wherein:

[0041] The high-concentration oily wastewater regulating module 1 is directly connected to the high-concentration oily wastewater production workshop, and is used to collect and regulate the high-concentration oily wastewater discharged from the high-concentration oily wastewater production workshop, and ensure the stability and efficiency of the subsequent treatment process by regulating the water quality and quantity of the high-concentration oily wastewater.

[0042] The water inlet of the acid separation oil separation module 2 is connected to the water outlet of the high-concentration oily wastewater regulating module 1, and is used to collect the high-concentration oily wastewater discharged from the high-concentration oily wastewater regulating module 1. The acid separation oil separation module 2 includes a dissolved oil precipitation unit 21 and an oil scraping treatment unit 22. The dissolved oil precipitation unit 21 is connected to the sulfuric acid storage tank in the dosing module 9, and is used to fully mix sulfuric acid with the high-concentration oily wastewater so that the floating oil in the wastewater can be precipitated. A first scraper is provided above the oil scraping treatment unit 22 to scrape off the precipitated floating oil, and the floating oil is discharged into the waste oil collection module 10. The dissolved oil precipitation unit 21 and the oil scraping treatment unit 22 cooperate with each other, and the floating oil is effectively scraped off by the first scraper to achieve oil-water separation. This design not only improves the oil-water separation efficiency, but also facilitates the recycling of floating oil.

[0043] Preferably, the dissolved oil separation unit 21 is connected to the oil scraping treatment unit 22 at the bottom, and the high-concentration oily wastewater flows from the dissolved oil separation unit 21 into the oil scraping treatment unit 22 in sequence by overflow. Furthermore, a slope partition guide plate is provided in the oil scraping treatment unit 22 and adjacent to the position where the dissolved oil separation unit 21 is connected to the bottom of the oil scraping treatment unit 22.

[0044] The integrated regulating module 3 has a water inlet connected to the water outlet of the acid separation oil separation module 2, and is used to collect the oily wastewater discharged from the acid separation oil separation module 2 and regulate the water quality and water quantity of the oily wastewater. This module further regulates the water quality and water quantity of the wastewater treated by the acid separation oil separation module 2 to ensure the best effect of subsequent flotation treatment.

[0045] Combined flotation treatment module, the water inlet of the combined flotation treatment module 4 is connected to the water outlet of the comprehensive adjustment module 3, which is used to collect the oily wastewater discharged from the comprehensive adjustment module 3, and to precipitate and remove the suspended oil and emulsified oil in the oily wastewater. The combined flotation treatment module includes a dosing unit 41 and a scum treatment unit 42, the dosing unit 41 is connected to the bottom of the scum treatment unit 42, the oily wastewater enters the scum treatment unit 42 from the dosing unit 41 by overflow, and a second scraper is provided on the upper part of the scum treatment unit 42 for scraping off the generated scum. This module effectively removes the suspended oil and emulsified oil in the wastewater through the cooperation of the dosing unit and the scum treatment unit 42. The design of the second scraper makes the removal of scum more convenient and efficient.

[0046] The hydrolysis and acidification treatment module 5, whose water inlet is connected to the water outlet of the combined flotation treatment module 4, comprises a suspended bed unit 51 for accommodating hydrolysis and acidification bacteria and a pulse water distributor unit 52 arranged above the suspended bed, for collecting the oily wastewater discharged from the combined flotation treatment module 4 and improving the biodegradability of the oily wastewater. The module utilizes the hydrolysis and acidification bacteria on the suspended bed unit 51 to improve the biodegradability of the wastewater and create favorable conditions for subsequent anaerobic and aerobic treatment. The pulse water distributor unit 52 ensures the uniform distribution and efficient operation of the hydrolysis and acidification bacteria.

[0047] The anaerobic treatment module 6 has a water inlet connected to the water outlet of the hydrolysis and acidification treatment module 5, and is used to collect biodegradable oily wastewater discharged from the hydrolysis and acidification treatment module 5, and perform anaerobically treatment to remove pollutants. The anaerobic treatment module 6 includes an anaerobic preparation unit 61, an anaerobic reaction unit 62 and a first sedimentation unit 63. The anaerobic preparation unit 61 is connected to the outlet of the hydrolysis and acidification treatment module 5, and is used to receive the oily wastewater discharged from the hydrolysis and acidification treatment module 5, and to adjust the water quality and quantity. The anaerobic reaction unit 62 is used to receive the wastewater discharged from the anaerobic preparation unit 61, and to perform anaerobic bacteria treatment to remove pollutants. The first sedimentation unit 63 is used to receive the wastewater discharged from the anaerobic reaction unit 62, and to perform sedimentation treatment. The first sedimentation unit 63 is also connected to the sludge collection module 11 and the anaerobic preparation unit 61, so as to discharge sludge to the sludge collection module 11 and to supplement part of the anaerobic sludge to the anaerobic preparation unit 61. Preferably, the anaerobic reaction unit 62 is a UASB anaerobic reaction tank.

[0048] Aerobic treatment module 7, the water inlet of the aerobic treatment module 7 is connected to the water outlet of the anaerobic treatment module 6, and is used to collect wastewater discharged from the anaerobic treatment module 6, and perform aerobic treatment to remove pollutants. The aerobic treatment module 7 includes an aerobic reaction unit 71 and a second sedimentation unit 72. The aerobic reaction unit 71 receives wastewater discharged from the anaerobic treatment module 6, and performs aerobic treatment to remove pollutants. The second sedimentation unit 72 is used to further remove pollutants from the wastewater discharged from the aerobic reaction unit 71. The second sedimentation unit 72 is also connected to the sludge collection module 11 to discharge sludge to the sludge collection module 11. Preferably, the aerobic reaction unit 71 is a multi-stage contact oxidation tank.

[0049] The anaerobic treatment module 6 and the aerobic treatment module 7 further remove pollutants in the wastewater through the action of anaerobic and aerobic microorganisms respectively. Through the steps of anaerobic preparation, anaerobic reaction, precipitation and aerobic reaction, efficient purification of wastewater is achieved.

[0050] The water quality monitoring module 8 has a water inlet connected to the water outlet of the aerobic treatment module 7, and is used to collect wastewater discharged from the aerobic treatment module 7 and monitor it for subsequent treatment. This module monitors the treated wastewater in real time to ensure that the water quality meets the discharge standards and provides data support for subsequent treatment.

[0051] The dosing module 9 is respectively connected to the acid separation oil separation module 2 and the combined flotation treatment module, so as to add drugs to the acid separation oil separation module 2 and the combined flotation treatment module. The water inlet of the waste oil collection module 10 is connected to the acid separation oil separation module 2, so as to collect the floating oil discharged by the acid separation oil separation module 2. The water inlet of the sludge collection module 11 is respectively connected to the combined flotation treatment module, the anaerobic treatment module 6, and the aerobic treatment module 7, so as to collect the sludge discharged by the combined flotation treatment module, the anaerobic treatment module 6, and the aerobic treatment module 7. These auxiliary modules are respectively responsible for the addition of drugs, the recovery of floating oil, and the treatment of sludge, so as to ensure the stable operation of the whole system and the effective use of resources.

[0052] The air blowing module 14 is respectively connected to the high-concentration oily wastewater regulating module 1, the comprehensive regulating module 3, the hydrolysis acidification treatment module 5 and the aerobic treatment module 7, so as to blow air into the high-concentration oily wastewater regulating module 1, the comprehensive regulating module 3, the hydrolysis acidification treatment module 5 and the aerobic treatment module 7. It is mainly used to aerate and oxygenate the aerobic reaction unit 71 to ensure the normal respiration and reaction of microorganisms, and is also used to fully stir and mix the wastewater in the high-concentration oily wastewater regulating module 1, the comprehensive regulating module 3 and the hydrolysis acidification treatment module 5.

[0053] In an optional embodiment, the refrigeration oil wastewater comprehensive treatment and discharge system may further include a deep treatment module 12, such as Figure 2As shown, the water inlet of the deep processing module 12 is connected to the water outlet of the water quality monitoring module 8, and the deep processing module 12 includes an ozone catalytic oxidation treatment unit 121, an aerated biological filter treatment unit 122, a clean water storage unit 123, and an ozone generating unit 124. The water outlet of the ozone catalytic oxidation treatment unit 121 is connected to the water inlet of the aerated biological filter treatment unit 122, and the water outlet of the aerated biological filter treatment unit 122 is connected to the water inlet of the clean water storage unit 123. The ozone catalytic oxidation treatment unit 121 and the aerated biological filter treatment unit 122 are used to further reduce the water discharged from the water quality monitoring module 8. The outlet of the clean water storage unit 123 is connected to the production workshop to transport the treated clean water to the production workshop. The ozone generating unit 124 is connected to the ozone catalytic oxidation treatment unit 121 to transport ozone to the ozone catalytic oxidation treatment unit 121. Ozone contacts the catalyst to produce hydroxyl radicals, which further mineralize the biodegradable organic matter in the wastewater or break the macromolecular substances into small molecules. The effluent of the ozone catalytic oxidation treatment unit 121 flows into the aerated biological filter treatment unit 122 by gravity, and the small molecules are further oxidized and decomposed by microorganisms to achieve the predetermined water quality target before disinfection and reuse. The deep treatment module 12 further reduces the hard-to-degrade organic matter in the wastewater through technologies such as the ozone catalytic oxidation treatment unit 121 and the aerated biological filter treatment unit 122, ensuring deep purification of the water quality. The aerated biological filter treatment unit 122 is also connected to the blower module 14, and the blower module 14 is used for aeration and oxygenation of the aerated biological filter treatment unit 122 to ensure normal respiration and reaction of microorganisms.

[0054] In an optional embodiment, the refrigeration oil wastewater comprehensive treatment and discharge system may also include a filter press module 13, which is connected to the sludge collection module 11 and is used to filter the sludge discharged from the sludge collection module 11. The filter press module 13 is responsible for filter press treatment of the sludge to achieve sludge reduction and resource utilization. Preferably, the filter press module 13 is also connected to the comprehensive adjustment module 3, which is used to discharge the filtrate into the comprehensive adjustment module 3 to achieve the recycling of the filtrate. The refrigeration oil wastewater comprehensive treatment and discharge system of the present application realizes the whole process treatment from wastewater collection to final discharge through scientific and reasonable modular design. The specific implementation steps are as follows: the wastewater first enters the high-concentration oil-containing wastewater adjustment module 1 to adjust the water quality and water quantity. The regulated wastewater enters the acid separation oil separation module 2, and the pH value of the wastewater is adjusted to a strong acid by adding sulfuric acid, so that most of the soluble oil in the wastewater is precipitated, showing floating oil, and the oil scraping treatment removes the floating oil. The wastewater continues to flow through the comprehensive regulation module 3 and the combined flotation treatment module, and the suspended oil or emulsified oil in the wastewater is removed by adding sodium hydroxide, PAC and PAM to reduce the adverse effects on the subsequent biochemical system. Subsequently, the wastewater enters the hydrolysis and acidification treatment module 5, and the macromolecular substances in the wastewater are converted into small molecular substances by hydrolysis and acidification bacteria, thereby improving the biodegradability of the wastewater and deeply purifying it through biological treatment. The effluent enters the anaerobic treatment module 6 and the aerobic treatment module 7 in turn, and most of the pollutants in the wastewater are removed by anaerobic bacteria, and the remaining pollutants are further removed by aerobic microorganisms. The treated wastewater is discharged after being tested and qualified by the water quality monitoring module 8, or enters the optional deep treatment module 12 to further improve the water quality. Auxiliary modules provide necessary support in the entire treatment process, such as the dosing module 9, the waste oil collection module 10, the sludge treatment module and the blast module 14.

[0055] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0056] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A comprehensive treatment and discharge system for refrigeration oil wastewater, characterized in that: include A high-concentration oily wastewater regulating module, which is connected to a high-concentration oily wastewater production workshop and is used to collect high-concentration oily wastewater discharged from the high-concentration oily wastewater production workshop and regulate the water quality and quantity of the high-concentration oily wastewater; an acid precipitation oil separation module, wherein the water inlet of the acid precipitation oil separation module is connected to the water outlet of the high-concentration oily wastewater regulating module, and is used to collect the high-concentration oily wastewater discharged from the high-concentration oily wastewater regulating module, and to precipitate and remove dissolved oil in the high-concentration oily wastewater; A comprehensive regulating module, wherein the water inlet of the comprehensive regulating module is connected to the water outlet of the acid separation and oil separation module, and is used to collect the oily wastewater discharged from the acid separation and oil separation module, and regulate the water quality and quantity of the oily wastewater; A combined air flotation treatment module, the water inlet of the combined air flotation treatment module is connected to the water outlet of the comprehensive regulation module, and is used to collect the oily wastewater discharged from the comprehensive regulation module, and to precipitate and remove the suspended oil and emulsified oil in the oily wastewater; A hydrolysis and acidification treatment module, the water inlet of the hydrolysis and acidification treatment module is connected to the water outlet of the combined air flotation treatment module, and is used to collect the oily wastewater discharged from the combined air flotation treatment module and improve the biodegradability of the oily wastewater; An anaerobic treatment module, wherein the water inlet of the anaerobic treatment module is connected to the water outlet of the hydrolysis and acidification treatment module, and is used to collect biodegradable oily wastewater discharged from the hydrolysis and acidification treatment module, and perform anaerobic treatment to remove pollutants; an aerobic treatment module, wherein the water inlet of the aerobic treatment module is connected to the water outlet of the anaerobic treatment module, and is used to collect wastewater discharged from the anaerobic treatment module and perform aerobic treatment to remove pollutants; A water quality monitoring module, wherein the water inlet of the water quality monitoring module is connected to the water outlet of the aerobic treatment module, and is used to collect wastewater discharged from the aerobic treatment module and monitor it for subsequent treatment; A dosing module, the dosing module is connected to the acid precipitation oil separation module and the combined flotation treatment module respectively, so as to add drugs to the acid precipitation oil separation module and the combined flotation treatment module; A waste oil collection module, the water inlet of which is connected to the acid separation oil separation module, and is used to collect floating oil discharged from the acid separation oil separation module; A sludge collection module, wherein the water inlet of the sludge collection module is respectively connected to the combined flotation treatment module, the anaerobic treatment module, and the aerobic treatment module, and is used to collect the sludge discharged by the combined flotation treatment module, the anaerobic treatment module, and the aerobic treatment module; A blast module, wherein the blast module is respectively connected to the high-concentration oily wastewater regulating module, the comprehensive regulating module, the hydrolysis acidification treatment module and the aerobic treatment module, so as to blow air into the high-concentration oily wastewater regulating module, the comprehensive regulating module, the hydrolysis acidification treatment module and the aerobic treatment module.

2. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 1 is characterized in that: The acid separation oil separation module includes a dissolved oil precipitation unit and an oil scraping treatment unit. The dissolved oil precipitation unit is connected to the sulfuric acid storage tank in the dosing module to fully mix the sulfuric acid with the high-concentration oily wastewater. A first scraper is provided above the oil scraping treatment unit to scrape off the precipitated floating oil.

3. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 2 is characterized in that: The dissolved oil separation unit is connected to the oil scraping treatment unit at the bottom, and the high-concentration oily wastewater flows from the dissolved oil separation unit into the oil scraping treatment unit in sequence by overflow.

4. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 3 is characterized in that: A sloped partition guide plate is provided in the oil scraping unit and adjacent to a position where the dissolved oil separation unit is connected to the bottom of the oil scraping unit.

5. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 1 is characterized in that: The combined flotation treatment module includes a dosing unit and a scum treatment unit. The dosing unit is connected to the bottom of the scum treatment unit. The oily wastewater enters the scum treatment unit from the dosing unit by overflow. A second scraper is provided on the top of the scum treatment unit to scrape off the generated scum.

6. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 1 is characterized in that: The hydrolysis and acidification treatment module comprises a suspended suspended bed unit for accommodating hydrolysis and acidification bacteria and a pulse water distributor unit arranged above the suspended bed.

7. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 1 is characterized in that: The anaerobic treatment module includes an anaerobic mixing unit, an anaerobic reaction unit and a first sedimentation unit. The anaerobic mixing unit is connected to the outlet of the hydrolysis and acidification treatment module, and is used to receive the oily wastewater discharged from the hydrolysis and acidification treatment module and adjust the water quality and quantity. The anaerobic reaction unit is used to receive the wastewater discharged from the anaerobic mixing unit and perform anaerobic bacteria treatment to remove pollutants. The first sedimentation unit is used to receive the wastewater discharged from the anaerobic reaction unit and perform sedimentation treatment. The first sedimentation unit is also connected to the sludge collection module and the anaerobic mixing unit, so as to discharge sludge to the sludge collection module and supplement part of the anaerobic sludge to the anaerobic mixing unit.

8. The refrigeration oil wastewater comprehensive treatment and discharge system according to claim 1 is characterized in that: The aerobic treatment module includes an aerobic reaction unit and a second sedimentation unit. The aerobic reaction unit receives the wastewater discharged from the anaerobic treatment module and performs aerobic treatment to remove pollutants. The second sedimentation unit is used to receive the wastewater discharged from the aerobic reaction unit and perform sedimentation treatment. The second sedimentation unit is also connected to a sludge collection module to discharge residual sludge to the sludge collection module and supplement part of the aerobic sludge to the front end of the aerobic reaction unit.

9. The refrigeration oil wastewater comprehensive treatment and discharge system according to any one of claims 1 to 8, characterized in that: It also includes a deep processing module, the water inlet of the deep processing module is connected to the water outlet of the water quality monitoring module, the deep processing module includes an ozone catalytic oxidation treatment unit, an aerated biological filter treatment unit, a clean water storage unit, and an ozone generating unit, the water outlet of the ozone catalytic oxidation treatment unit is connected to the water inlet of the aerated biological filter treatment unit, the water outlet of the aerated biological filter treatment unit is connected to the water inlet of the clean water storage unit, the ozone catalytic oxidation treatment unit and the aerated biological filter treatment unit are used to further reduce the difficult-to-degrade organic matter in the wastewater discharged from the water quality monitoring module, the water outlet of the clean water storage unit is connected to the production workshop for conveying treated clean water to the production workshop, and the ozone generating unit is connected to the ozone catalytic oxidation treatment unit for conveying ozone to the ozone catalytic oxidation treatment unit.

10. The refrigeration oil wastewater comprehensive treatment and discharge system according to any one of claims 1 to 8, characterized in that: It also includes a filter press module, which is connected to the sludge collection module and is used for filter pressing the sludge discharged from the sludge collection module.

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