Device for purifying kitchen wastewater and retaining organic components

Abstract

The utility model belongs to the technical field of wastewater treatment equipment, and provides a device for purifying kitchen wastewater and retaining organic components. Comprising a collection heat exchange system, a filtering system and an evaporation system. According to the utility model, organic nutritional ingredients in the wastewater are reserved in the wastewater treatment process, resource recycling is realized, no waste gas is generated in the treatment process, and secondary pollution is avoided. The device also has the advantages of high treatment efficiency, low investment cost, small occupied area and high resource reutilization rate.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment equipment, and in particular relates to a device for purifying kitchen wastewater and retaining organic components. Background Art

[0002] Kitchen waste is organic waste generated in daily life. Its treatment is of great significance to the environment and human health. Untreated kitchen waste is a breeding ground for bacteria and viruses, which can easily cause public health problems. By treating kitchen waste, we can effectively reduce the spread of pathogens, reduce the incidence of diseases, and protect public health. Therefore, treating kitchen waste is a necessary measure to protect the environment.

[0003] A large amount of wastewater is generated during the treatment of food waste, and there are many difficulties in its treatment process. Food wastewater is a complex organic wastewater, which contains a large amount of complex components such as protein, starch, oil, salt, etc. These components are easy to condense into agglomerates during the treatment process, and the COD content is very high, which increases the difficulty of treatment. Common food wastewater treatment processes include biological methods, chemical methods, physical methods, comprehensive methods, etc. These treatment methods all have certain shortcomings.

[0004] Take the biochemical method as an example: Biochemical treatment is a method that uses the metabolic process of microorganisms to convert organic matter in wastewater into stable inorganic matter. First, large particles in the water are separated by sedimentation and flotation, and then the organic matter is converted into methane, carbon dioxide and water through anaerobic and aerobic biological treatment. The advantages of this method are good treatment effect and low operating cost. The disadvantages are that nutrients are decomposed, the treatment time is long, the area occupied is large, and the one-time investment cost is high.

[0005] To this end, it has become a current and future technical need to develop a professional food waste wastewater treatment device and method that is energy-saving, efficient, occupies a small area, requires little investment, does not produce secondary pollution, and can effectively reuse the organic components of wastewater in food waste in conjunction with food waste treatment technology. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a device for purifying restaurant wastewater and retaining organic components. The device is not only suitable for the purification of restaurant wastewater, but also suitable for the fields of slaughter wastewater treatment, fruit processing wastewater treatment, etc., and has a good effect.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: to design a device for purifying kitchen wastewater and retaining organic components, including a collection and heat exchange system, a filtering system, and an evaporation system; the collection and heat exchange system includes a raw liquid feed pump, a condensate heat exchanger, a concentrated liquid heat exchanger, a non-condensable vapor condenser, a condensate collection tank, a condensate extraction pump, a concentrated liquid collection tank, and a concentrated liquid extraction pump; the filtering system includes a scraper filter, a filtering extraction pump, and a filter screen filter; the evaporation system includes a fresh steam pipeline, an evaporation feed pump, an evaporator, a thin film evaporator, and a centrifugal steam compressor; the raw liquid feed pump is connected to the condensate heat exchanger and the concentrated liquid heat exchanger at the same time, one side of the condensate heat exchanger is connected to the condensate extraction pump and the condensate outgoing pipeline, and the other side is connected to the non-condensing vapor cooler and the raw liquid feed pump; one side of the concentrated liquid heat exchanger is connected to the concentrated liquid extraction pump and the concentrated liquid outgoing pipeline, and one side is connected to the raw liquid feed pump and the non-condensing vapor cooler; the non-condensing vapor cooler pipe is connected to the condensate heat exchanger, The concentrate heat exchanger and scraper filter, the shell side is connected to the evaporator non-condensable steam outlet and the non-condensable steam outgoing pipeline, the bottom of the shell side is connected to the condensate collection tank, and is connected to the condensate heat exchanger through the condensate extraction pump; the scraper filter inlet is connected to the evaporator bottom and the non-condensable steam cooler tube side upper end, the scraper filter clear liquid outlet is connected to the evaporation feed pump and then leads to the evaporator feed port, the concentrated liquid outlet is connected to the filter extraction pump and the filter screen filter and then leads to the film evaporator feed port; the evaporation chamber of the evaporator is connected to the fresh steam pipeline and the free gas outlet of the condensate collection tank, the top of the evaporator is connected to the centrifugal steam compressor inlet, the centrifugal steam compressor outlet is connected to the evaporator tube side air inlet, the evaporator tube side non-condensable steam outlet is connected to the non-condensable steam cooler, and the evaporator shell side liquid outlet is connected to the condensate collection tank; the film evaporator shell side is connected to the fresh steam pipeline, the condensate is connected to the evaporator tube side, the film evaporator gas phase outlet enters the evaporation chamber, the concentrate outlet is connected to the concentrate collection tank, and leads to the concentrate heat exchanger through the concentrate extraction pump.

[0008] The utility model adopts the above technical scheme to design a device for purifying kitchen wastewater and retaining organic components, including a filtering system, a collecting heat exchange system, and an evaporation system. The filtering system includes a scraper filter, a filtering extraction pump, and a filter screen filter; the heat exchange system includes a raw liquid feed pump, a condensed water heat exchanger, a concentrated liquid heat exchanger, a non-condensable gas condenser, a condensate collection tank, a condensate extraction pump, a concentrated liquid collection tank, and a concentrated liquid extraction pump; the evaporation system includes a fresh steam pipeline, an evaporation feed pump, an evaporator, a thin film evaporator, and a centrifugal steam compressor. The raw liquid feed pump sends the raw liquid to the condensate heat exchanger and the concentrated liquid heat exchanger at the same time to exchange heat with the condensate and the concentrated liquid respectively, and then enters the non-condensable gas condenser tube to cool the small amount of water vapor carried in the non-condensable gas. After passing through the non-condensable gas condenser, the material enters the scraper filter, the clear liquid filtered by the scraper filter enters the evaporator, the filtered concentrated liquid enters the filter screen filter, the concentrated liquid filtered by the filter screen filter enters the thin film evaporator, and fresh steam enters the thin film evaporator shell to heat the material. The concentrated liquid concentrated by the thin film evaporator enters the concentrated liquid collection tank, and the concentrated liquid extracted by the concentrated liquid extraction pump goes to the concentrated liquid heat exchanger to exchange heat with the raw liquid; the clear liquid filtered by the scraper filter is sent to the nozzle of the evaporator evaporation chamber by the evaporation feed pump, the water vapor evaporated by the thin film evaporator enters the evaporation chamber together with the fresh steam for evaporation, the evaporated steam enters the centrifugal steam compressor, and enters the evaporator tube as heating steam after being compressed by the centrifugal steam compressor. The condensed liquid condensed in the tube enters the condensate collection tank, and the water vapor in the condensate collection tank enters the evaporation chamber of the evaporator. The material at the bottom of the evaporation chamber enters the scraper filter, and the clear liquid after filtration enters the evaporator again through the evaporation feed pump. Forced circulation evaporation is formed by the scraper filter, the evaporation feed pump, and the evaporator. The non-condensable gas in the evaporator tube enters the non-condensable gas condenser to cool the small amount of water vapor carried by other materials. The non-condensable gas condensed by the condenser is discharged into the next deodorization process. The centrifugal steam compressor includes a condensate separation tank and an oil supply system. The condensate in the compressor is separated in the condensate separation tank, and the water vapor enters the evaporator as a heat source. The condensate enters the next process together with the distilled condensate. The oil supply system includes an oil tank, an oil supply pump, and an oil supply filter. The oil tank provides lubricating oil to the compressor. The lubricating oil flows into the compressor through the oil supply pump and the oil supply filter, and then returns to the oil tank from the oil outlet of the compressor.

[0009] The utility model adopts the device designed by the above technical solution to purify kitchen wastewater and retain organic components. Through filtering and evaporation concentration, the distilled wastewater contains only low-component substances, impurities are basically removed, and COD is significantly reduced. The water vapor evaporated by the thin film evaporator is reused, and the heat pump uses latent heat, which greatly reduces energy consumption. The organic nutrients in the concentrate are basically retained, laying a good foundation for the reuse of the concentrate; while the traditional filtration and biochemical reaction treatment method, the impurities filtered out are used as solid waste, which may cause secondary pollution; the biochemical reaction decomposes organic matter to decompose methane and carbon dioxide. If it cannot be effectively recovered, it will not only be wasteful, but also cause environmental pollution and aggravate the greenhouse effect; the biochemical treatment method has a slow reaction and a long reaction time, and requires a large reaction pool or reaction tank, which occupies a large area and has a high investment cost.

[0010] The entire reaction process of the utility model has high processing efficiency, small footprint, simple process, energy-saving and environmentally friendly production process, and well retains organic nutrients. Through multiple filtration and evaporation of scraper filter, filter screen filter, evaporator, and thin film evaporator, suspended matter and solids in sewage are effectively removed, making the treated sewage clearer. Separating the concentrated liquid can well retain organic nutrients, laying the foundation for further effective utilization; at the same time, the use of fresh steam is reduced by using the evaporation process and the heat exchange of compressed steam, which improves the utilization rate of energy and reduces the processing cost, and has good economic and social benefits.

[0011] The utility model applies evaporation technology to sewage treatment, and combines heat pump technology with thin film evaporation technology to retain organic nutrients in the wastewater treatment process, so as to achieve the purpose of resource recycling. The thick material is filtered out by a scraper filter and a filter screen, and then most of the water is evaporated in a thin film evaporator and a forced circulation evaporation process. Experiments have shown that the COD of the condensate evaporated by evaporation technology can be reduced to below 500 mg / L, and the discharge standard can be met after simple biochemical treatment, or it can be used as a nutritious feed for breeding black soldier flies.

[0012] The device for purifying kitchen wastewater and retaining organic components of the utility model can also be promoted and applied to other aspects, such as slaughtering wastewater, fruit processing wastewater, etc., and has a good effect.

[0013] In summary, the utility model has a wide range of uses, obvious energy-saving effect, low investment cost, small footprint, high resource recycling rate, and will not cause secondary pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram showing the structure of a device for purifying kitchen wastewater and retaining organic components according to the utility model;

[0015] In the figure: 1-raw liquid feed pump, 2-condensate heat exchanger, 3-concentrate heat exchanger, 4-non-condensing condenser, 5-scraper filter, 6-evaporation feed pump, 7-evaporator, 8-centrifugal steam compressor, 9-condensate collecting tank, 10-condensate extraction pump, 11-filtration extraction pump, 12-screen filter, 13-thin film evaporator, 14-concentrate collecting tank, 15-concentrate extraction pump. DETAILED DESCRIPTION

[0016] The following is a detailed description of a device for purifying kitchen wastewater and retaining organic components according to the present invention in conjunction with the accompanying drawings.

[0017] Embodiment 1, see Figure 1The utility model discloses a device for purifying kitchen wastewater and retaining organic components, comprising a collection heat exchange system, a filtering system, and an evaporation system; the collection heat exchange system comprises a raw liquid feed pump 1, a condensate heat exchanger 2, a concentrated liquid heat exchanger 3, a non-condensable gas condenser 4, a condensate collection tank 9, a condensate extraction pump 10, a concentrated liquid collection tank 14, and a concentrated liquid extraction pump 15; the condensate heat exchanger 2 and the concentrated liquid heat exchanger 3 are both plate heat exchangers; in this technical solution, the sewage is separated in two plate heat exchangers through the raw liquid feed pump 1 The non-condensable gas in the tube side of the evaporator 7 enters the shell side of the non-condensable gas condenser 4 to cool the small amount of water vapor carried therein. The non-condensable gas condensed in the non-condensable gas condenser 4 is discharged into the next deodorization process. The condensed liquid condensed in the tube side of the evaporator 7 enters the condensate collecting tank 9 together with the coolant of the non-condensable gas condenser 4. The water vapor in the condensate collecting tank 9 enters the evaporation chamber of the evaporator 7. The condensate in the condensate collecting tank 9 is reused by the condensate extraction pump 10.The concentrated liquid concentrated by the thin film evaporator 13 enters the concentrated liquid collection tank 14, and the concentrated liquid is extracted by the concentrated liquid extraction pump 15 for reuse; the filtering system includes a scraper filter 5, a filtering extraction pump 11, and a screen filter 12; the sewage enters the scraper filter 5 after heat exchange, and the filtered clear liquid is pumped into the horizontal evaporator 7 through the evaporation feed pump 6, and the thick liquid filtered by the scraper filter 5 enters the screen filter 12 for filtration through the scraper filtration extraction pump 11, and then enters the thin film evaporator 13; the evaporation system includes a fresh steam pipeline, an evaporation feed pump 6, an evaporator 7, a thin film evaporator 13, and a centrifugal steam compressor 8; the thin film evaporator The water vapor evaporated by the device 13 enters the evaporation chamber together with the fresh steam for evaporation, and the evaporated steam enters the centrifugal steam compressor 8, and after being compressed by the centrifugal steam compressor 8, it enters the evaporator 7 pipe side as heating steam, and the material at the bottom of the evaporation chamber enters the scraper filter 5, and the clear liquid after filtration enters the evaporator 7 again through the evaporation feed pump 6, and the scraper filter 5, the evaporation feed pump 6, and the evaporator 7 form a forced circulation evaporation; the raw liquid feed pump 1 is connected to the condensate heat exchanger 2 and the concentrated liquid heat exchanger 3 at the same time, and one side of the condensate heat exchanger 2 is connected to the condensate extraction pump 10 and the condensate outgoing pipeline, and the other side is connected to the non-condensable steam cooler 4 and the raw liquid feed pump 10. Pump 1; one side of the concentrate heat exchanger 3 is connected to the concentrate extraction pump 15 and the concentrate outlet pipeline, and the other side is connected to the raw liquid feed pump 1 and the non-condensing steam cooler 4; the non-condensing steam cooler 4 pipe side is connected to the condensate heat exchanger 2, the concentrate heat exchanger 3 and the scraper filter 5, the shell side is connected to the non-condensing steam outlet and the non-condensing steam outlet pipeline of the evaporator 7, the bottom of the shell side is connected to the condensate collection tank 9, and is connected to the condenser heat exchanger 2 through the condensate extraction pump 10; the scraper filter 5 inlet is connected to the evaporator 7 bottom and the non-condensing steam cooler 4 pipe side upper port, the scraper filter 5 clear liquid outlet is connected to the evaporation feed pump 6 and then to the evaporator 7 feed port, and the concentrated liquid outlet is connected to the filter screen filter 12 Then it leads to the feed port of the thin film evaporator 13; the evaporation chamber of the evaporator 7 is connected to the fresh steam pipeline and the free gas outlet of the condensate collecting tank 9, the top of the evaporation chamber 7 is connected to the inlet of the centrifugal steam compressor 8, the outlet of the centrifugal steam compressor 8 is connected to the air inlet of the tube side of the evaporator 7, the non-condensing steam outlet of the tube side of the evaporator 7 is connected to the non-condensing steam cooler 4, and the shell side liquid outlet of the evaporator 7 is connected to the condensate collecting tank 9; the shell side of the thin film evaporator 13 is connected to the fresh steam pipeline, the condensate is connected to the tube side of the evaporator 7, the gas phase outlet of the thin film evaporator 13 enters the evaporation chamber of the evaporator 7, the concentrated liquid outlet is connected to the concentrated liquid collecting tank 14, and leads to the concentrated liquid heat exchanger 3 through the concentrated liquid extraction pump 15. The centrifugal compressor 8 can also be a Roots compressor.

[0018] Among them, centrifugal steam compressor 8: select a centrifugal steam compressor, controlled by a frequency converter, with an inlet temperature of 101-105°C, an outlet temperature of 107-115°C, a rotation speed of 8000 rpm, and a power configured according to production capacity.

[0019] Evaporator 7: Select a tube-and-tube evaporator. The evaporation area of ​​the evaporator is selected according to the production capacity, i.e. the feed volume flow rate.

[0020] Non-condensing steam condenser 4: Choose ordinary shell and tube condenser. The heat exchange area of ​​condenser is selected according to production capacity, i.e. feed volume flow rate.

[0021] Condensate heat exchanger 2, concentrate heat exchanger 3: ordinary shell and tube heat exchanger or plate heat exchanger is used, and the model depends on the designed capacity.

[0022] Scraper filter 5: Self-cleaning filter is used, and the production capacity is equipped with feed flow.

[0023] Filter mesh filter 12: Use stainless steel filter mesh filter, filtering capacity feed flow configuration.

[0024] Thin film evaporator 13: A scraped thin film evaporator is used, and the heating area is selected according to the output.

[0025] Condensate extraction pump 10, filter extraction pump 11, concentrate extraction pump 15: corrosion-resistant centrifugal pumps are selected, and the model is determined according to the designed production capacity.

[0026] The stock solution and heating steam used in the utility model are as follows:

[0027] Raw wastewater: clarified wastewater after kitchen waste is squeezed, crushed and oil separated, with a COD of 8000 mg / L, oil content less than 0.5%, and impurities less than 2%.

[0028] Heating steam: saturated water vapor with a temperature greater than 170°C.

[0029] The method of using the utility model comprises the following steps:

[0030] The first step, heat exchange:

[0031] The raw liquid passes through the raw liquid feed pump 1 and the condensed water heat exchanger 2 and the concentrated liquid heat exchanger 3 to exchange heat with the condensed water and the concentrated liquid respectively. After passing through the non-condensing steam condenser 4, the raw liquid exchanges heat with the non-condensable steam of the evaporator 7, and then enters the scraper filter 5 together with the dense phase residue of the evaporator 7;

[0032] Step 2, filtering:

[0033] The clear liquid filtered out by the scraper filter 5 enters the evaporator 7 through the evaporation feed pump 6, and the concentrated liquid filtered out by the scraper filter 5 enters the screen filter 12 through the scraper filter extraction pump 11, and then enters the thin film evaporator 13 for further evaporation and concentration;

[0034] Step 3: Concentration:

[0035] The concentrate is heated to 105-120° C. by fresh steam in the thin film evaporator 13, and the evaporated water vapor provides heat for the evaporator 7. The concentrate enters the concentrate collecting tank 14, and is heat-exchanged with the original liquid by the concentrate heat exchanger 3 through the concentrate extraction pump 10. The concentrate after heat exchange enters the recycling process, i.e., as a nutritious feed for breeding black soldier flies;

[0036] Step 4: Evaporation:

[0037] The clear liquid from the scraper filter 5 enters the evaporator 7 for evaporation through the evaporation feed pump 6, and directly exchanges heat with the hot steam through the feed nozzle. The liquid then exchanges heat indirectly with the compressed steam in the tube side, so that the temperature in the evaporator 7 is maintained at 101-105°C. The insufficient heat is supplemented by fresh steam. The evaporated water vapor enters the centrifugal steam compressor 8. After compression by the centrifugal steam compressor 8 and the release of latent heat, the water vapor temperature is increased to 107°C-115°C, and enters the tube side of the evaporator 7 to exchange heat with the material in the evaporator 7.

[0038] Step 5: Condensation

[0039] The condensate in the tube side of the evaporator 7 enters the condensate collecting tank 9, and the non-condensable gas in the evaporator tube side is condensed into a small amount of condensate after heat exchange with the original liquid through the non-condensing steam condenser 4, and enters the condensate collecting tank 9; the condensate is pumped out by the condensate pump 10 and then passes through the condensed water heat exchanger 2 to form a evaporated liquid and is discharged, and the non-condensable gas is cooled by the non-condensing steam condenser 4 and enters the condensate collecting tank 9.

[0040] Furthermore, the centrifugal steam compressor 8 is replaced by a Roots compressor.

[0041] Furthermore, the evaporator 7 , the scraper filter 5 and the evaporation feed pump 6 form a forced circulation evaporation.

[0042] Furthermore, the centrifugal steam compressor 8 includes a condensate separation tank 9 and a feeding system. The condensate in the centrifugal steam compressor 8 is separated in the condensate separation tank 9, and the steam enters the evaporator 7 as a heat source. The condensate and the distilled condensate are then recovered after heat exchange. The feeding system includes an oil tank, an oil supply pump, and an oil supply filter. The oil tank provides lubricating oil to the centrifugal steam compressor. The lubricating oil flows into the centrifugal steam compressor through the oil supply pump and the oil supply filter, and then returns to the oil tank from the oil outlet of the centrifugal steam compressor.

[0043] In the above process, through filtration and evaporation concentration, the impurity removal rate in the sewage is greater than 98%, and the COD is reduced to below 500 mg / L.

[0044] The utility model uses filtration and evaporation concentration to distill wastewater containing only low-component substances, and impurities are basically removed, and COD is significantly reduced. The water vapor evaporated by the thin film evaporator 13 is reused, and the use of latent heat by the heat pump greatly reduces energy consumption. The organic nutrients in the concentrate are basically retained, laying a good foundation for the reuse of the concentrate; the traditional filtration and biochemical reaction treatment method uses impurities filtered out as solid waste, which may cause secondary pollution; the biochemical reaction decomposes organic matter to decompose methane and carbon dioxide. If it cannot be effectively recovered, it will not only be a waste, but also cause environmental pollution and aggravate the greenhouse effect; the biochemical treatment method has a slow reaction and a long reaction time, and requires a large reaction pool or reaction tank, which occupies a large area and has a high investment cost.

[0045] The kitchen wastewater treatment method of the utility model has obvious energy-saving effect, high treatment efficiency, low investment cost, small footprint, high resource recycling rate, and will not cause secondary pollution to the environment.

[0046] To facilitate the understanding of those skilled in the art, the following conventional treatment method is used as a comparative example to compare with the method of the present invention:

[0047] Comparative Example 1:

[0048] The conventional method for treating kitchen wastewater is adopted, and the specific steps include:

[0049] The first step is wastewater pretreatment:

[0050] The bulky matter is removed from the original wastewater by filtration and sedimentation;

[0051] Step 2: flotation:

[0052] After the first step is completed, flocculants are added to the wastewater and stirred to form large flocs. The flocs float on the water surface under the action of the air pump and are then separated by the scraper.

[0053] The third step, biochemical treatment:

[0054] After the first and second steps of separation, the wastewater enters the anaerobic and aerobic sections respectively; anaerobic biological treatment is to convert organic matter into methane and carbon dioxide through the action of anaerobic microorganisms under anaerobic conditions; aerobic biological treatment is to convert organic matter into carbon dioxide and water through the action of aerobic microorganisms under aerobic conditions;

[0055] Step 4: Secondary precipitation and filtration:

[0056] The wastewater after biochemical treatment is filtered through volcanic rock or sand to filter out clean water for discharge;

[0057] In the second step of biochemical treatment, anaerobic reaction is slow and requires anaerobic bacteria to decompose organic matter in an oxygen-free environment, which takes a long time and the corresponding reaction container needs to be large. Aerobic reaction requires full contact with air and uses aerobic bacteria to decompose organic matter, which requires a large area and a long period of time.

[0058] Compared with the prior art, it can be seen that:

[0059] The organic application components of the utility model are well preserved, which is very important for the reuse of resources;

[0060] Biochemical reactions have slow biological decomposition and take a long time, resulting in large reaction vessels, large floor space, and high investment costs.

[0061] The utility model combines heat pump technology with thin film evaporation technology. First, the heat pump evaporation technology is used to evaporate and dehydrate the kitchen wastewater, and then it is further concentrated in the thin film evaporator 13. Experiments have shown that the COD of the discharged sewage is less than 500 mg / L by combining heat pump technology with thin film evaporation to concentrate the kitchen wastewater. The concentrated liquid can well retain the organic nutrients therein and can be used for black soldier fly breeding or organic fertilizer production. The utility model effectively solves the problem of difficult treatment of kitchen wastewater, retains the organic nutrients in the concentrate, achieves the purpose of wastewater purification and resource recycling, and has good economic and social benefits.

[0062] In summary, the utility model is a device for purifying kitchen wastewater and retaining organic components. The kitchen wastewater passes through the raw material pump to exchange heat with condensed water and concentrated liquid in the plate heat exchanger respectively, and then goes to the non-condensable gas condenser 4 for cooling after heat exchange, and then enters the scraper filter 5 together with the residue of the evaporator 7; the clear liquid filtered out of the sewage through the scraper filter 5 is pumped into the horizontal evaporator 7 through the evaporation feed pump 6. The thick liquid filtered out by the scraper filter 5 enters the filter screen filter 12 for filtration through the scraper filter extraction pump 11, and then enters the thin film evaporator 13. The concentrate is heated to 105-120°C by fresh steam in the thin film evaporator 13, and the evaporated water vapor enters the evaporator 7 to provide heat for the evaporator 7. The concentrated liquid enters the concentrated liquid collecting tank 14, and exchanges heat with the raw material through the concentrated liquid extraction pump 15. The concentrated liquid after heat exchange enters the reuse process. The clear liquid filtered by the scraper filter 5 enters the evaporator 7 for evaporation, and directly exchanges heat with the hot steam through the feed nozzle, and then the liquid indirectly exchanges heat with the compressed steam in the tube, and then the heat is supplemented by fresh steam. The temperature in the evaporator 7 is maintained at 101-105°C, and the evaporated water vapor enters the centrifugal compressor 8. After compression by the centrifugal compressor 8 and the release of latent heat, the water vapor temperature is raised to 107°C-115°C, and enters the tube to exchange heat with the material in the evaporator 7; the condensate in the tube of the evaporator 7 enters the condensate collecting tank, and the non-condensable gas in the tube of the evaporator 7 exchanges heat with the raw material through the condenser, and a small amount of condensate is condensed into the condensate collecting tank. The condensate is extracted by the condensate pump 10 and enters the deep treatment after heat exchange with the raw material through the heat exchanger. The non-condensable gas is cooled by the non-condensable steam condenser 4 and enters the deep deodorization process. The utility model retains the organic nutrients in the wastewater during the wastewater treatment process, realizes resource reuse, and no waste gas is generated during the treatment process, and no secondary pollution is caused. The utility model also has the advantages of high processing efficiency, low investment cost, small footprint and high resource recycling rate.

Claims

1. A device for purifying kitchen wastewater and retaining organic components, characterized by: It includes a collection and heat exchange system, a filtration system, and an evaporation system; the collection and heat exchange system includes a raw liquid feed pump, a condensate heat exchanger, a concentrate heat exchanger, a non-condensable vapor condenser, a condensate collection tank, a condensate extraction pump, a concentrate collection tank, and a concentrate extraction pump; the filtration system includes a scraper filter, a filter extraction pump, and a screen filter; the evaporation system includes a fresh steam pipeline, an evaporation feed pump, an evaporator, a thin film evaporator, and a centrifugal steam compressor; the raw liquid feed pump is simultaneously connected to the condensate heat exchanger and the concentrate heat exchanger, one side of the condensate heat exchanger is connected to the condensate extraction pump and the condensate outgoing pipeline, and the other side is connected to the non-condensable vapor cooler and the raw liquid feed pump; one side of the concentrate heat exchanger is connected to the concentrate extraction pump and the concentrate outgoing pipeline, and the other side is connected to the raw liquid feed pump and the non-condensable vapor cooler; the non-condensable vapor cooler pipe side is connected to the condensate heat exchanger, the concentrate heat exchanger and the scraper filter, and the shell side is connected to the evaporator non-condensable vapor The outlet and the non-condensable steam outlet pipeline, the bottom of the shell side is connected to the condensate collection tank, and is connected to the condensate heat exchanger through the condensate extraction pump; the scraper filter inlet is connected to the bottom of the evaporator and the top of the non-condensable steam cooler tube side, the scraper filter clear liquid outlet is connected to the evaporation feed pump and then to the evaporator feed port, the concentrated liquid outlet is connected to the filter extraction pump and the filter screen filter and then to the film evaporator feed port; the evaporation chamber of the evaporator is connected to the fresh steam pipeline and the free gas outlet of the condensate collection tank, the top of the evaporator is connected to the centrifugal steam compressor inlet, the centrifugal steam compressor outlet is connected to the evaporator tube side air inlet, the evaporator tube side non-condensable steam outlet is connected to the non-condensable steam cooler, and the evaporator shell side liquid outlet is connected to the condensate collection tank; the film evaporator shell side is connected to the fresh steam pipeline, the condensate is connected to the evaporator tube side, the film evaporator gas phase outlet enters the evaporation chamber of the evaporator, the concentrated liquid outlet is connected to the concentrated liquid collection tank, and is connected to the concentrated liquid heat exchanger through the concentrated liquid extraction pump.

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