Smoke washing wastewater recycling treatment system

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a smoke washing wastewater recycling treatment system. The smoke washing wastewater reuse treatment system comprises a heat exchanger, a regulating tank, a 1 # reaction tank, a 2 # reaction tank, a sedimentation tank, a softening circulating tank, a softening membrane device, a softening water production tank, an ultrahigh pressure reverse osmosis device and a reuse water tank which are connected in sequence, and adopts a new process system of pretreatment, softening, softening membrane, ultrahigh pressure RO and evaporative crystallization. Wherein the softening membrane device can effectively remove most pollutants, so that the treated water quality reaches the factory return water standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a cigarette washing wastewater recycling treatment system. Background Art

[0002] The composition of the tobacco washing wastewater generated by waste incineration power plants and other industries during the flue gas purification (humidity desulfurization) of incinerators is relatively complex. It contains a large number of toxic and harmful substances to the environment, such as chloride ions, sulfate ions, and heavy metals. Direct discharge will cause serious harm to the surrounding environment. In order to alleviate the problems of water shortage and aggravated water pollution, waste incineration plants basically require water treatment and reuse of tobacco washing wastewater.

[0003] However, the existing process generally uses simple precipitation flocculation and filtration methods for treatment. Some pollutants in the tobacco washing wastewater (such as chloride, sulfate, ammonia nitrogen, heavy metals, etc.) cannot be removed or are not removed completely, and the quality of the reused water is poor. Once it is reused many times, the load on the subsequent reuse system will increase. Therefore, it is necessary to design a new treatment process to make the wastewater quality meet the reuse standards of the plant and fully recycle the wastewater resources. Utility Model Content

[0004] The utility model aims to provide a recycling treatment system for cigarette washing wastewater, so as to solve the technical problem of incomplete removal of pollutants in the existing cigarette washing wastewater treatment process.

[0005] The present application provides a tobacco washing wastewater recycling treatment system, comprising:

[0006] The heat exchanger, regulating tank, 1# reaction tank, 2# reaction tank, sedimentation tank, softening circulation tank, softening membrane device, softening water production tank, ultra-high pressure reverse osmosis device, and reuse water tank are connected in sequence;

[0007] A circulation pipeline is formed between the softening circulation tank and the softening membrane device through a circulation pump, and the wastewater in the softening circulation tank is sent to the softening membrane device through the circulation pump for membrane separation;

[0008] A backwash / flushing pipeline is formed between the softening water production pool and the softening membrane device through a backwash / flushing pump, and the produced water in the softening water production pool is returned to the softening membrane device through the backwash / flushing pump for the membrane cleaning stage.

[0009] In one embodiment of the present application, the concentrated water from the softening membrane device is discharged into a sedimentation tank.

[0010] In one embodiment of the present application, a pipeline between the softening membrane device and the softening water production pool is connected to a hydrochloric acid dosing device for adjusting the pH value.

[0011] In one embodiment of the present application, the 1# reaction tank is connected to the first dosing device;

[0012] The 2# reaction tank is connected to the second dosing device.

[0013] In one embodiment of the present application, the tobacco washing wastewater reuse treatment system further comprises: a sludge dewatering machine and a sludge transport device;

[0014] The sludge dewatering machine is used to receive the sediment in the sedimentation tank, and discharge the dry sludge into the sludge transport device and the filtrate into the regulating tank respectively.

[0015] In one embodiment of the present application, the tobacco washing wastewater reuse treatment system further comprises: an evaporator and a solid salt collection device;

[0016] The evaporator is used to receive concentrated water discharged from the ultra-high pressure reverse osmosis device, and to discharge evaporated cooling water into a reuse water pool and solid miscellaneous salts into a solid miscellaneous salt collection device.

[0017] The beneficial effects of the utility model are:

[0018] The tobacco washing wastewater reuse treatment system of the present application includes a heat exchanger, a regulating tank, a 1# reaction tank, a 2# reaction tank, a sedimentation tank, a softening circulation tank, a softening membrane device, a softening water production tank, an ultra-high pressure reverse osmosis device, and a reuse water tank connected in sequence, and adopts a new process system of "pretreatment + softening + softening membrane + ultra-high pressure RO + evaporation crystallization", in which the softening membrane device can effectively remove most of the pollutants, so that the treated water quality meets the return water standard of the plant.

[0019] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model 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, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of a tobacco washing wastewater recycling treatment system according to a preferred embodiment of the utility model.

[0023] In the figure:

[0024] Heat exchanger 1, regulating tank 2, 1# reaction tank 3, first dosing device 31, 2# reaction tank 4, second dosing device 41, sedimentation tank 5, sludge dewatering machine 51, sludge transport device 52, softening circulation tank 6, softening membrane device 7, softening water production tank 8, ultra-high pressure reverse osmosis device 9, evaporator 91, solid miscellaneous salt collection device 92, reuse water tank 10. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Professional terms and explanations:

[0027] Flue gas washing wastewater: Acidic wastewater generated during the flue gas purification (humidity desulfurization) of incinerators in industries such as waste incineration power plants.

[0028] The present application provides a system for recycling and treating wastewater from tobacco washing, which is described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0029] See also Figure 1 In one embodiment of the present application, a tobacco washing wastewater reuse treatment system includes: a heat exchanger 1, a regulating tank 2, a 1# reaction tank 3, a 2# reaction tank 4, a sedimentation tank 5, a softening circulation tank 6, a softening membrane device 7, a softening water production tank 8, an ultra-high pressure reverse osmosis device 9, and a reuse water tank 10 connected in sequence; wherein a circulation pipeline is formed between the softening circulation tank 6 and the softening membrane device 7 through a circulation pump, and the wastewater in the softening circulation tank 6 is sent to the softening membrane device 7 through the circulation pump for membrane separation stage; a backwash / flushing pipeline is formed between the softening water production tank 8 and the softening membrane device 7 through a backwash / flushing pump, and the water produced in the softening water production tank 8 is returned to the softening membrane device 7 through the backwash / flushing pump for membrane cleaning stage.

[0030] In this embodiment, optionally, the concentrated water from the softening membrane device 7 is discharged into the sedimentation tank 5 .

[0031] In this embodiment, optionally, a hydrochloric acid dosing device is connected to the pipeline between the softening membrane device 7 and the softening water production pool 8 to adjust the pH value.

[0032] Optionally, the 1# reaction tank 3 is connected to a first dosing device 31 ; and the 2# reaction tank 4 is connected to a second dosing device 41 .

[0033] In some embodiments, the type and amount of the chemicals added in the first chemical dosing device 31 and the second chemical dosing device 41 can be selected according to the amount of pollution that needs to be removed in the wastewater.

[0034] In this embodiment, optionally, the tobacco washing wastewater reuse treatment system also includes: a sludge dewatering machine 51 and a sludge transport device 52; the sludge dewatering machine 51 is used to receive the sediment in the sedimentation tank 5, and discharge the dry sludge into the sludge transport device 52 and the filtrate into the regulating tank 2 respectively.

[0035] In this embodiment, the tobacco washing wastewater reuse treatment system optionally further includes: an evaporator 91 and a solid salt collection device 92; the evaporator 91 is used to receive concentrated water discharged from the ultra-high pressure reverse osmosis device 9, and discharge the evaporated cooling water into the reuse water pool 10 and the solid salt into the solid salt collection device 92. In an optional specific application scenario, the workflow of the tobacco washing wastewater reuse treatment system is as follows:

[0036] a: The tobacco washing wastewater is collected and enters the tobacco washing wastewater treatment pipeline, where it is cooled by circulating cooling water in the heat exchanger 1 and sent to the regulating tank 2;

[0037] b: The wastewater in the regulating tank 2 is sent to the 1# reaction tank 3, and liquid alkali, metal chelating agent, calcium chloride and other reagents are added into the 1# reaction tank 3 through the first dosing device 31. The above reagents react chemically with most of the heavy metal ions in the wastewater and enter the 2# reaction tank 4;

[0038] c: Liquid alkali, sodium carbonate and other reagents are added to the 2# reaction tank 4 through the second dosing device 41 for chemical reaction, and sent to the sedimentation tank 5 for sedimentation and separation. The lower sediment is transported to the sludge dewatering machine 51 for sludge drying, and the filtrate is returned to the regulating tank 2, and the dry sludge is discharged into the sludge transport device 52;

[0039] d: The wastewater from the above step is sent to the softening circulation tank 6, and then filtered by the softening membrane device 7. The membrane produced water is adjusted with hydrochloric acid to enter the softening water production tank 8, and the concentrated water is returned to the sedimentation tank 5;

[0040] e: After the wastewater in the softened water production pool 8 is sent to the high-pressure reverse osmosis device 9 for filtration, the produced water directly enters the reuse water pool 10, the concentrated water enters the evaporator 91 for evaporation and crystallization to obtain solid salt, and the evaporated cooling water enters the reuse water pool 10 for reuse.

[0041] In summary, the utility model of the cigarette washing wastewater reuse treatment system passes the pretreated cigarette washing wastewater through the softening membrane device and the ultra-high pressure reverse osmosis device in sequence, and the organic matter removal rate in the water reaches more than 98%, the total salt content removal rate reaches more than 98%, and the heavy metal ion removal rate reaches more than 97%. The treated water quality meets the reuse water standard; the equipment has the advantages of high integration, small footprint, efficient water resource utilization, and no pollution.

[0042] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0043] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A tobacco washing wastewater recycling treatment system, characterized in that: include: The heat exchanger (1), regulating tank (2), No. 1 reaction tank (3), No. 2 reaction tank (4), sedimentation tank (5), softening circulation tank (6), softening membrane device (7), softening water production tank (8), ultra-high pressure reverse osmosis device (9), and reuse water tank (10) are connected in sequence; wherein A circulation pipeline is formed between the softening circulation tank (6) and the softening membrane device (7) through a circulation pump, and the wastewater in the softening circulation tank (6) is sent to the softening membrane device (7) through the circulation pump to perform a membrane separation stage; A backwash / flushing pipeline is formed between the softened water production pool (8) and the softening membrane device (7) through a backwash / flushing pump, and the produced water in the softened water production pool (8) is returned to the softening membrane device (7) through the backwash / flushing pump to perform a membrane cleaning stage.

2. The tobacco washing wastewater recycling treatment system according to claim 1 is characterized in that: The concentrated water from the softening membrane device (7) is discharged into the sedimentation tank (5).

3. The tobacco washing wastewater recycling treatment system according to claim 2 is characterized in that: The pipeline between the softening membrane device (7) and the softening water production pool (8) is connected to a hydrochloric acid dosing device for adjusting the pH value.

4. The tobacco washing wastewater recycling treatment system according to claim 1 is characterized in that: The 1# reaction tank (3) is connected to a first dosing device (31); The 2# reaction tank (4) is connected to a second dosing device (41).

5. The tobacco washing wastewater recycling treatment system according to claim 1 is characterized in that: The tobacco washing wastewater recycling treatment system further comprises: a sludge dewatering machine (51) and a sludge transport device (52); The sludge dewatering machine (51) is used to receive the sediment from the sedimentation tank (5), and discharge the dry sludge into the sludge transport device (52) and the filtrate into the regulating tank (2).

6. The tobacco washing wastewater recycling treatment system according to claim 1 is characterized in that: The tobacco washing wastewater recycling treatment system further comprises: an evaporator (91) and a solid salt collecting device (92); The evaporator (91) is used to receive concentrated water discharged from the ultra-high pressure reverse osmosis device (9), and to discharge evaporated cooling water into a reuse water pool (10) and solid impurities into a solid impurities collection device (92).

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