Tobacco factory tobacco wastewater treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a tobacco factory tobacco wastewater treatment system. The treatment system comprises a grating device, a coagulation air flotation device, a denitrification-nitrification device, an MBR device and a nanofiltration device which are communicated in sequence, the coagulation air flotation device is provided with an alkali liquor adding assembly, a coagulant adding assembly and a flocculant adding assembly; the denitrification-nitrification device comprises a denitrification tank, a nitrification tank and filler; the filler is mounted in the denitrification tank and the nitrification tank in a suspension manner; a produced water outlet of the MBR device is communicated with a water inlet of the nanofiltration device; and a concentrated solution outlet of the nanofiltration device is communicated with a water inlet of the coagulation air flotation device. The treatment system provided by the utility model is stable in long-term operation, can realize full-amount treatment of the tobacco wastewater and reach the standard of effluent, and meanwhile, the whole treatment system is simple in device, efficient in treatment and low in cost, and has good economic applicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a tobacco wastewater treatment system for a cigarette factory. BACKGROUND

[0002] The comprehensive wastewater of a cigarette factory mainly comprises two parts of production wastewater and domestic sewage. The production wastewater contains tar substances, a small amount of colloid, lignin, suspended solids, essence, nicotine and other substances, wherein, most of the essence, adhesives and tar substances are difficult to degrade. The production wastewater usually accounts for more than 60% of the comprehensive wastewater of the cigarette factory, and the domestic wastewater is mainly oil-containing sewage from the staff canteen. Therefore, the wastewater of the cigarette factory has the characteristics of high pollutant concentration, complex composition, large fluctuation of water quantity and quality, poor biodegradability and the like, and it is difficult to treat.

[0003] With the development of economy, the requirement for energy saving and emission reduction has been gradually improved in recent years. If there is no special reuse requirement, the general standard for environmental assessment and approval of water reuse projects in the domestic tobacco industry is "Urban Reuse of Municipal Sewage Water Quality for Urban Miscellaneous Water" (GB / T18920-2020) and "Urban Reuse of Municipal Sewage Water Quality for Industrial Water" (GB / T19923-2005).

[0004] For the wastewater treatment of the cigarette factory with high water quality requirements, the most common method is to use the double membrane method. For example, the Chinese patent document with the announcement number CN217025676U discloses a sewage treatment system provided with an ultrafiltration reverse osmosis system, which comprises a preliminary treatment system, a biochemical treatment system and a deep treatment system. The biochemical treatment system can ensure that the water quality meets the "Urban Reuse of Municipal Sewage Water Quality for Urban Miscellaneous Water", and the deep treatment system can ensure that the water quality meets the "Drinking Water Standard" through the process of "bag filter + ultrafiltration device + reverse osmosis device". A small amount of concentrated liquid produced by reverse osmosis meets the "Urban Reuse of Municipal Sewage Water Quality for Urban Miscellaneous Water", and the water is reused. However, since the reverse osmosis has poor tolerance to organic pollution, further treatment is needed to reduce the organic matter before the sewage enters the reverse osmosis system, which increases the process chain and also increases the operating cost. Moreover, under the requirement of high water production, a higher driving pressure of reverse osmosis is needed, so the overall hardware pressure grade and the installed power of the water pump are higher, which increases the investment cost and also increases the operating cost. Therefore, for projects that only have further requirements for COD and ammonia nitrogen in the effluent but have no special requirements for salt, the use of the double membrane method will directly lead to a substantial increase in the investment cost and operating cost of the sewage treatment system, and it is difficult to meet the requirements of effluent standard and economic applicability at the same time. UTILITY MODEL CONTENTS

[0005] The utility model aims at the fact that the existing tobacco wastewater treatment system is difficult to meet the requirements of effluent standard and economic applicability at the same time, and provides a tobacco wastewater treatment system for a cigarette factory.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The processing system includes grid device, coagulation air floatation device, denitrification-nitrification device, MBR device and nanofiltration device which are communicated in sequence, the coagulation air floatation device is equipped with lye adding assembly, coagulant adding assembly and flocculating agent adding assembly, the denitrification-nitrification device includes denitrification tank, nitrification tank and filler, the filler is installed in the denitrification tank and nitrification tank in the way of suspension, the water inlet of the denitrification tank is communicated with the water outlet of the coagulation air floatation device, the water outlet of the denitrification tank is communicated with the water inlet of the nitrification tank, the water outlet of the nitrification tank is communicated with the water inlet of the MBR device, the water production outlet of the MBR device is communicated with the water inlet of the nanofiltration device, and the concentrated liquid outlet of the nanofiltration device is communicated with the water inlet of the coagulation air floatation device.

[0008] In some specific embodiments, the grid device includes a primary grid and a secondary grid, the bar spacing of the primary grid is 30-50mm, and the bar spacing of the secondary grid is 5-10mm.

[0009] In some specific embodiments, an adjusting tank is arranged on the pipeline communicated between the grid device and the coagulation air floatation device, the water inlet of the adjusting tank is communicated with the concentrated liquid outlet of the nanofiltration device, and the adjusting tank is equipped with aerator I.

[0010] In some specific embodiments, the coagulation air floatation device is equipped with a PLC interlock for adjusting the dosing amount of lye, coagulant and flocculating agent.

[0011] In some specific embodiments, the volume filling rate of the filler in the denitrification tank and the nitrification tank is independently 30-50%, the water outlet of the nitrification tank is equipped with a screen for preventing the detached biofilm from entering the MBR device, and the nitrification tank is equipped with aerator II.

[0012] In some specific embodiments, the water outlet of the nitrification tank is communicated with the water inlet of the denitrification tank, and the denitrification-nitrification device is equipped with sludge concentration on-line monitor, dissolved oxygen monitor and pH meter.

[0013] In some specific embodiments, the MBR device includes membrane tank, membrane assembly in the membrane tank and water production tank, the membrane assembly is flat plate ultrafiltration membrane assembly, and the membrane flux of the membrane assembly is 15-20LMH.

[0014] In some specific embodiments, the nanofiltration device comprises a nanofiltration membrane assembly, the operating flux of the nanofiltration membrane assembly is 16-18 LMH, the operating pressure is 10-18 bar, and the aperture of the nanofiltration membrane is 1-2 nm.

[0015] In some specific embodiments, the nanofiltration membrane device is provided with a liquid level interlocking automatic shutdown assembly.

[0016] In some specific embodiments, the treatment system further comprises a sludge treatment device, the sludge treatment device comprises a sludge pool and a sludge dewatering machine; the sludge pool is used for storing sludge from the coagulation air flotation device, the denitrification-nitrification device.

[0017] Beneficial effects: in the treatment system provided by the utility model, the tobacco wastewater of the cigarette factory enters the coagulation air flotation device, under the joint action of lye, coagulant and flocculant, most of the suspended solids, oil and hardness can be removed, which can not only ensure the stable circulation of the nanofiltration concentrated solution in the treatment system, but also is beneficial to the stable operation of the nanofiltration device; the effluent of the coagulation air flotation device enters the denitrification-nitrification device, since the suspension type filler is filled in the denitrification pool and the nitrification pool, on the one hand, it is beneficial to improving the treatment capacity and the anti-impact load of the denitrification-nitrification device, and on the other hand, it is beneficial to reducing the sludge entering the MBR device and prolonging the cleaning cycle of the MBR device; the effluent of the denitrification-nitrification device is treated through the MBR device and the nanofiltration device, the nanofiltration effluent can be discharged up to the standard, and the concentrated solution generated by the nanofiltration can be returned to the coagulation air flotation device for continuous treatment, and there is no concentrated solution discharge. In summary, the treatment system provided by the utility model is stable in long-term operation, has no concentrated solution discharge, can realize the full treatment of the tobacco wastewater and the effluent up to the standard, at the same time, the whole treatment system device is simple, the treatment is efficient, the cost is reduced, and the treatment system has good economic applicability. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0019] Figure 1 It is the structure schematic diagram of the cigarette factory tobacco wastewater treatment system of an embodiment of the utility model. DETAILED DESCRIPTION

[0020] Although the present application can readily be practised in various embodiments, only some specific embodiments thereof are shown in the drawings and will be described in detail in the present specification, while it is to be understood that the present specification is to be regarded as being a demonstrative illustration of the principles of the present application and is not intended to limit the present application to what is stated herein.

[0021] Thus, one feature indicated in the present specification will be used to illustrate one feature of one embodiment of the present application, rather than implying that every embodiment of the present application must have the illustrated feature. In addition, it should be noted that the present specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly illustrated. Thus, unless otherwise stated, the illustrated combinations are not intended to be limiting.

[0022] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) are used to explain the structure and movement of various elements of the present application are not absolute but relative. These indications are appropriate when these elements are in the positions shown in the drawings. If the positions of these elements change, then the indications of directions also change accordingly.

[0023] The cigarette factory tobacco wastewater treatment system provided by the present application comprises a grid device, a coagulation air flotation device, a denitrification-nitrification device, an MBR device and a nanofiltration device which are sequentially communicated; the coagulation air flotation device is provided with an alkali liquor adding assembly, a coagulant adding assembly and a flocculant adding assembly; the denitrification-nitrification device comprises a denitrification tank, a nitrification tank and a filler, the filler is installed in the denitrification tank and the nitrification tank in a suspended manner, the water inlet of the denitrification tank is communicated with the water outlet of the coagulation air flotation device, the water outlet of the denitrification tank is communicated with the water inlet of the nitrification tank, and the water outlet of the nitrification tank is communicated with the water inlet of the MBR device; the water production outlet of the MBR device is communicated with the water inlet of the nanofiltration device; and the concentrated liquid outlet of the nanofiltration device is communicated with the water inlet of the coagulation air flotation device.

[0024] Further, the grid device comprises a primary grid and a secondary grid. The bar spacing of the primary grid is preferably 30-50 mm, such as 30 mm, 35 mm, 40 mm, 45 mm, 50 mm or any value therebetween. The bar spacing of the secondary grid is preferably 5-10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value therebetween. The wastewater is first treated by the primary grid, mainly for intercepting the pollutants with large particle size in the wastewater, and then treated by the secondary grid, further removing the suspended matters with small particle size in the wastewater, thereby being beneficial to guaranteeing the stable operation of the downstream wastewater treatment system.

[0025] Further, an adjusting tank is arranged on the pipeline communicated between the grid device and the coagulation air floatation device, the water inlet of the adjusting tank is communicated with the concentrated liquid outlet of the nanofiltration device, and the adjusting tank is provided with an aerator I. The wastewater and the concentrated liquid from the nanofiltration device are mixed in the adjusting tank, which plays a homogenizing role, and the aerator I arranged in the adjusting tank can preliminarily degrade part of the organic pollutants, which is beneficial to reducing the sewage treatment load of the subsequent coagulation air floatation device and improving the treatment efficiency of the whole system.

[0026] Further, the aerator I can be a disc aerator or a pipe aerator.

[0027] Further, the coagulation air floatation device is provided with a PLC interlock device for adjusting the dosing amount of the lye, the coagulant and the flocculant. Through the action of the PLC interlock device, the dosing amount of the lye can be adjusted in real time, the pH of the wastewater is adjusted to 8-9, part of the hardness and demulsification is removed, the dosing amount of the coagulant and the flocculant can be adjusted in real time according to the water inflow and the flocculation condition, part of the hardness, most of the grease and the suspended solids are removed, at this time, it is more beneficial to save the dosing amount, and the stable and efficient operation of the coagulation air floatation device is ensured, and the economic applicability is improved.

[0028] Further, the volume filling rate of the filler in the denitrification tank and the nitrification tank is independently preferably 30-50%, such as 30%, 35%, 40%, 45%, 50% or any value between them, at this time, it is more beneficial to biofilm formation, further improves the treatment capacity and impact load resistance of the denitrification-nitrification device, and reduces the sludge concentration of the wastewater entering the MBR device. The water outlet of the nitrification tank is provided with a screen mesh for preventing large pieces of biofilm from falling into the MBR device. The pore size of the screen mesh is preferably 5-15mm, such as 5mm, 8mm, 0mm, 12mm, 15mm or any value between them. The screen mesh is preferably a pull-out type screen mesh, which is convenient to disassemble. The nitrification tank is provided with an aerator II, and the aerator I can be a disc aerator or a pipe aerator.

[0029] Further, the water outlet of the nitrification tank is communicated with the water inlet of the denitrification tank, and a reflux flow meter is arranged on the pipeline communicated between the two. The nitrification liquid in the nitrification tank is partially refluxed into the denitrification tank, which provides the nitrate electron acceptor for the denitrification process, thereby further improving the denitrification efficiency.

[0030] Further, the denitrification-nitrification device is provided with a sludge concentration on-line monitor, a dissolved oxygen monitor, and a pH meter. The sludge concentration on-line monitor is used to monitor the sludge concentration in the denitrification tank and the nitrification tank, so that the sludge concentration can be stabilized in real time by adjusting the return flow of the nitrification tank, thereby ensuring the stable operation and impact load resistance of the denitrification-nitrification device. The dissolved oxygen monitor is used to monitor the amount of dissolved oxygen in the nitrification tank, so that the appropriate amount of dissolved oxygen can be adjusted to ensure the full performance of the nitrification reaction while reducing excess energy consumption.

[0031] Further, the MBR device comprises a membrane tank, a membrane assembly located in the membrane tank, and a product water tank. The water inlet of the membrane tank is in communication with the water outlet of the denitrification-nitrification device, the product water outlet of the membrane tank is in communication with the water inlet of the product water tank, and the water outlet of the product water tank is in communication with the water inlet of the nanofiltration device. The water outlet of the denitrification-nitrification device enters the MBR device, is filtered by the membrane assembly in the membrane tank, and then the obtained product water is collected in the product water tank before entering the nanofiltration device.

[0032] Further, the membrane assembly is preferably a flat plate ultrafiltration membrane assembly. The membrane flux of the membrane assembly is preferably 15-20 LMH, such as 15 LMH, 16 LMH, 17 LMH, 18 LMH, 19 LMH, 20 LMH, or any value therebetween.

[0033] Further, the product water tank is provided with a pH regulator dosing assembly and a scale inhibitor dosing assembly to adjust the pH value of the wastewater to 5.5-6.0, which is conducive to providing the processing efficiency of the subsequent nanofiltration device.

[0034] Further, the nanofiltration device comprises a nanofiltration membrane assembly. The operating flux of the nanofiltration membrane assembly is preferably 16-18 LMH, such as 16 LMH, 17 LMH, 18 LMH, or any value therebetween, and the operating pressure is preferably 10-18 bar, such as 10 bar, 12 bar, 14 bar, 16 bar, 18 bar, or any value therebetween. The pore size of the nanofiltration membrane is preferably 1-2 nm, such as 1.0 nm, 1.2 nm, 1.5 nm, 1.8 nm, 2 nm, or any value therebetween, which can retain most of the microorganisms, and the coliform group number of the effluent can meet the effluent requirements, without the need for additional ultraviolet sterilization, chlorine sterilization, and other process sections, thereby further reducing the cost and improving the economic applicability.

[0035] Further, the nanofiltration membrane device is provided with a liquid level interlocking automatic shutdown assembly for protecting the nanofiltration membrane device and improving the automation level of the nanofiltration membrane device.

[0036] Further, the treatment system further comprises a sludge treatment device. The sludge treatment device comprises a sludge pool and a sludge dewatering machine. The sludge pool is used for storing sludge from the coagulation air flotation device, the denitrification-nitrification device. The sludge dewatering machine can be a conventional sludge dewatering machine used in wastewater treatment, which can be, but is not limited to, at least one of a plate-and-frame sludge dewatering machine, a belt sludge dewatering machine, a sludge centrifugal dewatering machine, a stacked sludge dewatering machine, and a screw press dewatering machine.

[0037] The utility model will be described in detail through specific embodiments.

[0038] Embodiment 1

[0039] This embodiment is used to illustrate a tobacco wastewater treatment system in a cigarette factory, referring to Figure 1 The treatment system comprises a grid device 1, a regulating pool 2, a coagulation air flotation device 3, a denitrification-nitrification device 4, an MBR device 5, a nanofiltration device 6, and a sludge treatment device 7.

[0040] The grid device 1 comprises a primary grid (with a grid bar spacing of 40 mm) and a secondary grid (with a grid bar spacing of 5 mm). The wastewater is sequentially treated by the primary grid and the secondary grid to intercept pollutants with large particle sizes and suspended solids with small particle sizes in the wastewater, thereby ensuring stable operation of the downstream wastewater treatment system. The water outlet of the grid device 1 is in communication with the water inlet of the regulating pool 2.

[0041] The regulating pool 2 is provided with a tubular aerator. In the regulating pool, the wastewater is mixed with concentrated liquid from the nanofiltration device 6 to play a homogenizing role and can preliminarily degrade part of the organic pollutants, thereby reducing the wastewater treatment load of the subsequent coagulation air flotation device. The water outlet of the regulating pool 2 is in communication with the water inlet of the coagulation air flotation device 3.

[0042] The coagulation air flotation device 3 is provided with an alkali adding assembly, a coagulant adding assembly, a flocculant adding assembly, and a PLC interlocking device. Under the combined action of alkali, coagulant, and flocculant, most of the suspended solids, oil, and hardness in the wastewater can be removed. At the same time, the dosing amount of alkali, coagulant, and flocculant can be adjusted in real time through the PLC interlocking device to ensure stable and efficient operation of the coagulation air flotation device 3. The water outlet of the coagulation air flotation device 3 is in communication with the water inlet of the denitrification-nitrification device 4.

[0043] The denitrification-nitrification device 4 comprises a denitrification tank, a nitrification tank, a hanging filler installed in the denitrification tank and the nitrification tank (the volume filling rate is 40% respectively), a sludge concentration on-line monitor, a dissolved oxygen monitor, a pH meter, the water inlet of the denitrification tank is communicated with the water outlet of the coagulation air flotation device 3, the water outlet of the denitrification tank is communicated with the water inlet of the nitrification tank, the water outlet of the nitrification tank is communicated with the water inlet of the denitrification tank and the water inlet of the MBR device, and a reflux flow meter is arranged on the pipeline communicated with the water outlet of the nitrification tank and the water inlet of the denitrification tank, and the water outlet of the nitrification tank is provided with a pull type screen with a pore size of 10 mm.

[0044] The MBR device 5 comprises a membrane tank, a flat plate ultrafiltration membrane assembly arranged in the membrane tank, and a water production tank, and the membrane flux is 15 LMH. The water inlet of the membrane tank is communicated with the water outlet of the denitrification-nitrification device, the water outlet of the membrane tank is communicated with the water inlet of the water production tank, and the water outlet of the water production tank is communicated with the water inlet of the nanofiltration device 6.

[0045] The nanofiltration device 6 comprises a nanofiltration membrane assembly and a liquid level interlocking automatic shutdown assembly, the operation flux of the nanofiltration membrane assembly is 17 LMH, the operation pressure is 14 bar, and the pore size of the nanofiltration membrane is 1.0 nm. The concentrated liquid outlet of the nanofiltration device 6 is communicated with the water inlet of the adjusting tank 2. The water production tank is provided with a pH regulator dosing assembly and a scale inhibitor dosing assembly.

[0046] The sludge treatment device 7 comprises a sludge tank 71 and a plate-and-frame sludge dewatering machine 72. The water inlet of the sludge tank 71 is communicated with the sludge discharge port of the coagulation air flotation device 3, the sludge discharge port of the denitrification-nitrification device 4, and the sludge discharge port of the MBR device, for storing the sludge from the coagulation air flotation device, the denitrification-nitrification device and the MBR device. The water outlet of the sludge tank 71 is communicated with the inlet of the plate-and-frame sludge dewatering machine 72, and the sludge is dewatered and discharged outside.

[0047] A certain cigarette factory in Liaoning produces 1200 t / d of tobacco production wastewater and domestic sewage, the water quality and the effluent standard are shown in Table 1, the original treatment system is “pretreatment + first-order AO + air flotation + disinfection”, the effluent index meets the Liaoning Province municipal pipe network access standard (reuse water standard), and the treatment scale is 50 t / h. When the standard is upgraded from the Liaoning Province municipal pipe network access standard to the newly added enterprise internal control standard, and the limitation requirements of CODcr and NH3-N are increased, it is difficult for the original treatment system to stably meet the standard.

[0048] The treatment system provided in the embodiment is used for treatment, the treatment scale is 175 t / h, the treatment time is 8 h, the sodium hydroxide solution is added in the coagulation air flotation device 3, the PAC is used as the coagulant, the PAM is used as the flocculant, the pH is adjusted to 8-9, the sodium hydroxide solution is added in the water production tank as the pH regulator (the pH is adjusted to 7.5), the water produced by the nanofiltration device 6 can meet the internal control standard, the upgrading reconstruction is completed, there is no concentrated liquid discharge, the operation energy consumption is low, and the treatment system has economic applicability.

[0049] Table 1

[0050]

[0051] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model.

Claims

1. A cigarette factory tobacco wastewater treatment system, characterized in that, The treatment system comprises a grid device, a coagulation air floatation device, a denitrification-nitrification device, an MBR device and a nanofiltration device which are sequentially connected; the coagulation air floatation device is provided with an alkali adding assembly, a coagulant adding assembly and a flocculant adding assembly; the denitrification-nitrification device comprises a denitrification tank, a nitrification tank and a filler which is installed in the denitrification tank and the nitrification tank in a suspended manner; the water inlet of the denitrification tank is connected with the water outlet of the coagulation air floatation device; the water outlet of the denitrification tank is connected with the water inlet of the nitrification tank; the water outlet of the nitrification tank is connected with the water inlet of the MBR device; the water outlet of the MBR device is connected with the water inlet of the nanofiltration device; and the concentrated liquid outlet of the nanofiltration device is connected with the water inlet of the coagulation air floatation device.

2. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The grid device comprises a primary grid and a secondary grid; the bar spacing of the primary grid is 30-50 mm; and the bar spacing of the secondary grid is 5-10 mm.

3. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, An adjusting tank is arranged on the pipeline connecting the grid device and the coagulation air floatation device; the water inlet of the adjusting tank is connected with the concentrated liquid outlet of the nanofiltration device; and the adjusting tank is provided with an aerator I.

4. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The coagulation air floatation device is provided with a PLC interlocking device for adjusting the dosing amount of alkali, coagulant and flocculant.

5. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The volume filling rate of the filler in the denitrification tank and the nitrification tank is independently 30-50%; the water outlet of the nitrification tank is provided with a screen for preventing the detached biofilm from entering the MBR device; and the nitrification tank is provided with an aerator II.

6. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The water outlet of the nitrification tank is connected with the water inlet of the denitrification tank. The denitrification-nitrification device is provided with a sludge concentration on-line monitor, a dissolved oxygen monitor and a pH meter.

7. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The MBR device comprises a membrane tank, a membrane assembly in the membrane tank and a water production tank; the membrane assembly is a flat plate ultrafiltration membrane assembly; and the membrane flux of the membrane assembly is 15-20 LMH.

8. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The nanofiltration device comprises a nanofiltration membrane assembly; the operation flux of the nanofiltration membrane assembly is 16-18 LMH; the operation pressure is 10-18 bar; and the pore size of the nanofiltration membrane is 1-2 nm.

9. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The nanofiltration membrane device is provided with a liquid level interlocking automatic shutdown assembly.

10. The cigarette-manufacturing tobacco wastewater treatment system of claim 1, wherein, The treatment system further comprises a sludge treatment device which comprises a sludge tank and a sludge dewatering machine; and the sludge tank is used for storing the sludge from the coagulation air floatation device and the denitrification-nitrification device.

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