Emergency biochemical treatment system for printing and dyeing wastewater

Abstract

The utility model discloses an emergency biochemical treatment system for printing and dyeing wastewater. The emergency biochemical treatment system comprises an anoxic tank, an aerobic tank, an MBR (Membrane Bioreactor) membrane tank, a clean water tank and an air blower which are all integrally arranged in a main tank body, a pretreated water inlet is formed in the front end of the anoxic tank, a water outlet is formed in the rear end of the anoxic tank, and the water outlet is sequentially connected with the aerobic tank and the MBR membrane tank; the aerobic tank is connected back to the anoxic tank through a first return pipe; the MBR membrane tank is connected back to the aerobic tank through a second return pipe; a centrifugal submersible aerator is arranged in the aerobic tank; aerobic aeration equipment is arranged at the bottom in the aerobic tank; biochemical aeration equipment is arranged at the bottom in the MBR membrane tank; two air supply ports of the air blower are respectively connected with the aerobic aeration equipment and the biochemical aeration equipment; a water outlet at the rear end of the MBR membrane tank is connected with the clean water tank, and the MBR membrane tank is provided with a sludge discharge port; and the clean water tanks are respectively provided with treated water outlets. According to the system, the treatment stability is improved, and the influence of acute change of inlet water quality on outlet water can be better dealt with.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to an emergency biochemical treatment system for printing and dyeing wastewater. Background Art

[0002] Printing and dyeing wastewater has the characteristics of complex organic components, high concentration, many difficult-to-degrade substances, high chroma, high toxicity, and large changes in water quality. It is difficult to degrade wastewater. In recent years, with the development of the dye industry and the advancement of post-finishing technology, new auxiliaries, dyes, finishing agents and other difficult-to-biodegrade organic substances have been used in large quantities in the printing and dyeing industry, resulting in an increase in the content of printing and dyeing wastewater and a decrease in the content of printing and dyeing wastewater, which has brought greater difficulty to the treatment of printing and dyeing wastewater.

[0003] At present, the main methods for treating printing and dyeing wastewater include physical method, chemical method, biological method and so on.

[0004] Physical methods mainly include adsorption and membrane separation. Among the physical methods, adsorption decolorization is the most widely used. By using porous solid media, dye molecules are adsorbed on its surface to achieve a good decolorization effect. Adsorbents include activated carbon, ion exchange fibers, and natural waste. This method is very suitable for the deep treatment of low-concentration printing and dyeing wastewater. It has the advantages and characteristics of low investment cost, simple operation method, and low cost. It is more suitable for the treatment of wastewater from small and medium-sized printing and dyeing enterprises. The traditional adsorbent is mainly activated carbon. Activated carbon has good adsorption properties for water-soluble dyes such as cationic dyes and reactive dyes. However, it cannot eliminate edema colloidal hydrophobic dyes. In addition, the regeneration cost is high, which hinders the application and development of activated carbon.

[0005] The chemical methods mainly include chemical coagulation, photocatalysis, ozone oxidation, Fenton reagent, nano zero-valent iron, and electrochemical oxidation. Chemical coagulation was once known as one of the most economically effective and effective decolorization treatment technologies. It mainly utilizes the dissociation of coagulants and the combined action of hydrolysis products to destabilize and condense colloidal pollutants and fine suspended matter in water into separable and flocculent bodies, which are then coagulated as a whole. Generally, the water temperature of printing and dyeing wastewater is relatively high, which can accelerate the hydrolysis process of inorganic salt coagulants to achieve an ideal coagulation effect. The main advantages of coagulation technology are simple operation methods and requirements, low investment costs, and the selection of suitable flocculants according to different water qualities, so that the treatment effect and cost can be controlled within a certain range and level. However, the disadvantage is that for some wastewater, the dosage may need to be increased or expensive flocculants may need to be purchased, thereby increasing the operating cost. In addition, the scope of application is narrow. If soluble colored pollutants are encountered, the decolorization effect is poor, and a large amount of chemical sludge is generated. In terms of sludge treatment, the operation difficulty and operating cost are directly increased, and a larger area is required, which can easily cause secondary pollution.

[0006] Biological methods are widely used in the treatment of printing and dyeing wastewater. The biological method is that microbial enzymes degrade dye molecules to destroy the unsaturated bonds and chromogenic groups of the dye, decompose macromolecular dye organic matter into small molecules or primary substances, and thus achieve the purpose of treating printing and dyeing wastewater. Biological methods are divided into aerobic methods, anaerobic methods, and aerobic-anaerobic combined treatment methods according to the different requirements for oxygen demand in the microbial respiration process. The biological method is simple to operate, the microorganisms are easy to culture, easy to survive, reproduce quickly, and the treatment cost is low. With the increase in the number of dyes, the biological method has gradually failed to meet the requirements, so it has certain limitations.

[0007] Chinese patent application 202222771881.X discloses a printing and dyeing wastewater reuse treatment system, which consists of a water inlet system, an anaerobic system, an anoxic system, an aerobic system, an MBR system, an electron radiation system, an MCR system, and an RO system connected in sequence. However, it is equipped with an anaerobic system, and the aerobic system has a low processing capacity, which makes the system's emergency processing capacity poor.

[0008] Chinese patent application 202211489752.X discloses a printing and dyeing wastewater treatment and reuse system, which consists of a mechanical grille, a water collection tank, an air flotation device, a hydrolysis acidification tank, an anoxic tank, an aerobic tank, an MBR membrane tank, an MBR water production tank, a quartz sand filter, and a reverse osmosis system. Due to the pretreatment section, the water inlet of the equipment needs to be hydrolyzed and acidified, and cannot be directly connected to the water outlet after air flotation; and the biochemical treatment level is low, and the system's emergency treatment capacity is poor.

[0009] In view of this, the present utility model is proposed. Utility Model Content

[0010] The purpose of the utility model is to provide an emergency biochemical treatment system for printing and dyeing wastewater, which can improve the stability of biochemical treatment, better cope with the impact of acute changes in influent water quality on effluent, and thus solve the above-mentioned technical problems existing in the prior art.

[0011] The purpose of this utility model is achieved through the following technical solutions:

[0012] An emergency biochemical treatment system for printing and dyeing wastewater, comprising:

[0013] The main tank body, anoxic tank, aerobic tank, MBR membrane tank, clean water tank, activated carbon dosing device, submersible aerator and blower; among them,

[0014] The anoxic tank, aerobic tank, MBR membrane tank, clean water tank and blower are all integrated in the main tank body;

[0015] The anoxic tank is provided with a pre-treated water inlet at the front end and a water outlet at the rear end, and the water outlet is connected to the aerobic tank and the MBR membrane tank in sequence;

[0016] The aerobic tank is connected back to the anoxic tank via a first reflux pipe;

[0017] The MBR membrane tank is connected back to the aerobic tank through a second reflux pipe;

[0018] A submersible aerator is arranged in the aerobic pool;

[0019] Aerobic aeration equipment is arranged at the bottom of the aerobic pool;

[0020] The activated carbon dosing device is connected to the aerobic tank;

[0021] A biochemical aeration device is arranged at the bottom of the MBR membrane pool;

[0022] The two air supply ports of the blower are respectively connected to the aerobic aeration equipment and the biochemical aeration equipment;

[0023] The rear end water outlet of the MBR membrane pool is connected to the clean water pool, and the MBR membrane pool is provided with a mud discharge outlet;

[0024] The clean water tanks are respectively provided with treated water outlets.

[0025] Compared with the prior art, the printing and dyeing wastewater emergency biochemical treatment system provided by the utility model has the following beneficial effects:

[0026] By adopting the anoxic tank, aerobic tank and MBR membrane tank connected in sequence to form anoxic-aerobic-MBR process, combined with the PACT activated carbon technology formed by the activated carbon dosing device connected to the aerobic tank, the biochemical treatment capacity of the system is improved, and the dosage of activated carbon can be adjusted to have different effects on the biochemical system, thereby improving the emergency treatment capacity of the biochemical system. This system improves the stability of biochemical treatment and can better cope with the impact of acute changes in influent water quality on effluent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of an emergency biochemical treatment system for printing and dyeing wastewater provided in an embodiment of the utility model.

[0029] Figure 2 A schematic diagram of the specific structure of the printing and dyeing wastewater emergency biochemical treatment system provided in an embodiment of the utility model.

[0030] Figure 3This is a diagram of COD removal effect over reaction time when different activated carbon dosages are added in the printing and dyeing wastewater emergency biochemical treatment system provided by the embodiment of the utility model.

[0031] In the figure: 1-pretreatment water inlet; 2-anoxic tank; 3-aerobic tank; 301-aerobic zone 1; 302-aerobic zone 2; 4-MBR membrane tank; 5-equipment room; 6-clear water tank; 7-treated water outlet; 8-MBR membrane washing agent box; 9-blower; 10-submersible aerator; 11-flow pusher; 12-water pump 1; 13-water pump 2; 14-water pump 3; 15-aeration membrane box; 16-first group of valves; 17-second group of valves; 1 8-first aeration equipment; 19-second aeration equipment; 20-activated carbon dosing device; 21-water passage one; 22-water passage two; 23-pump outlet main pipe; 24-water inlet pipe from aerobic tank to membrane tank; 25-water inlet pipe from membrane tank to clean water tank; 26-first return pipe; 27-second return pipe; 28-aerobic tank aeration main air inlet pipe; 29-first aeration pipe; 30-second aeration pipe; 31-membrane tank air inlet pipe; 32-drug washing pipe; 33-mud discharge port. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, which does not constitute a limitation of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0033] First, the terms that may be used in this article are explained as follows:

[0034] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0035] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0036] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0037] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0038] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0039] The emergency biochemical treatment system for printing and dyeing wastewater provided by the utility model is described in detail below. The contents not described in detail in the embodiments of the utility model belong to the prior art known to professional and technical personnel in the field. If no specific conditions are specified in the embodiments of the utility model, the conventional conditions in the field or the conditions recommended by the manufacturer are followed. If the manufacturer of the reagents or instruments used in the embodiments of the utility model is not specified, they are all conventional products that can be purchased commercially.

[0040] like Figure 1 , Figure 2 As shown, the utility model embodiment provides an emergency biochemical treatment system for printing and dyeing wastewater, comprising:

[0041] The main tank body, anoxic tank, aerobic tank, MBR membrane tank, clean water tank, activated carbon dosing device, centrifugal submerged aerator and blower; among them,

[0042] The anoxic tank, aerobic tank, MBR membrane tank, clean water tank, activated carbon dosing device and blower are all integrated in the main tank body;

[0043] The anoxic tank is provided with a pre-treated water inlet at the front end and a water outlet at the rear end, and the water outlet is connected to the aerobic tank and the MBR membrane tank in sequence;

[0044] The aerobic tank is connected back to the anoxic tank via a first reflux pipe;

[0045] The MBR membrane tank is connected back to the aerobic tank through a second reflux pipe;

[0046] A submersible aerator is arranged in the aerobic pool;

[0047] Aerobic aeration equipment is arranged at the bottom of the aerobic pool;

[0048] The activated carbon dosing device is connected to the aerobic tank;

[0049] A biochemical aeration device is arranged at the bottom of the MBR membrane pool;

[0050] The two air supply ports of the blower are respectively connected to the aerobic aeration equipment and the biochemical aeration equipment;

[0051] The rear end water outlet of the MBR membrane pool is connected to the clean water pool, and the MBR membrane pool is provided with a mud discharge outlet;

[0052] The clean water tanks are respectively provided with treated water outlets.

[0053] Preferably, in the above system, the anoxic pool is arranged at the front end of the main pool body, and a flow pusher is provided in the anoxic pool;

[0054] The rear end of the anoxic pool is separated from the aerobic pool by a first partition, and a water hole 1 connected to the aerobic pool is provided on the first partition;

[0055] The flow promoter and the water passage hole are arranged staggered.

[0056] Preferably, in the above system, the aerobic pool is arranged in the middle part of the main pool body, and the aerobic pool is composed of an aerobic zone 1 and an aerobic zone 2 arranged in sequence from front to back, the front end of the aerobic zone 1 is connected to the anoxic pool, and the rear end of the aerobic zone 1 is separated from the aerobic zone 2 by a second partition, and a water hole 2 connected to the aerobic zone 2 is arranged on the second partition;

[0057] The aerobic aeration equipment is composed of a first aeration equipment laid at the bottom of the aerobic zone 1 and a second aeration equipment laid at the bottom of the aerobic zone 2, wherein the first aeration equipment is connected to the blower via a second set of valves and the aerobic tank aeration main air inlet pipe;

[0058] The submersible aerator is composed of a first submersible aerator and a second submersible aerator. The first submersible aerator is arranged in the aerobic zone 1, and the second submersible aerator is arranged in the aerobic zone 2.

[0059] Preferably, in the above system, the first aeration device is composed of a first aeration coil pipe laid at the bottom of the aerobic zone 1 and a plurality of aeration plates evenly arranged on the first aeration coil pipe;

[0060] The second aeration device is composed of a second aeration coil pipe laid on the bottom of the second aerobic zone and a plurality of aeration plates evenly arranged on the second aeration coil pipe.

[0061] Preferably, in the above system, the MBR membrane pool is arranged at the rear end of the main pool body and is separated from the rear end of the aerobic zone II of the aerobic pool by a third partition;

[0062] The aerobic zone 2 is connected to the MBR membrane pool through a water pump 1 and a water inlet pipe provided with a first set of valves.

[0063] Preferably, in the above system, the biochemical aeration equipment in the MBR membrane pool adopts an aeration membrane box, and the aeration membrane box is connected to the blower through a membrane pool air inlet pipe.

[0064] Preferably, in the above system, an equipment room is further provided at the rear end of the main tank body, the clean water tank, the MBR membrane tank reagent box and the blower are respectively provided in the equipment room, and a water pump 3 is also provided in the equipment room;

[0065] The water pump 3 is connected to the water outlet pipeline, one end of the water outlet pipeline is connected to the MBR membrane tank, the other end of the water outlet pipeline is connected to the clean water tank, and the other end of the water outlet pipeline is connected to the backwash end of the aeration membrane box in the MBR membrane tank;

[0066] The water pump is connected to the MBR membrane tank through a dosing pipeline;

[0067] A drainage outlet is arranged at the rear end of the clean water tank, and a mud discharge outlet is arranged at the bottom.

[0068] Preferably, in the above system, the first return pipe is laid in the main tank body, the first return pipe is connected to a water pump 1 arranged in the aerobic zone 2 of the aerobic tank through a first set of valves, and the rear end of the first return pipe is connected to the front end of the anoxic tank;

[0069] The second reflux pipe is laid in the main tank body, the front end of the second reflux pipe is connected to the water pump 2 arranged in the MBR membrane tank, and the rear end is connected to the aerobic zone 2.

[0070] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the printing and dyeing wastewater emergency biochemical treatment system provided by the present invention is described in detail below with reference to specific embodiments.

[0071] Example 1

[0072] like Figure 1 , Figure 2 As shown, this embodiment provides an emergency biochemical treatment system for printing and dyeing wastewater, comprising:

[0073] Anoxic tank 2, aerobic tank 3, MBR membrane tank 4, clean water tank 6, activated carbon dosing device 20, submersible aerator 10 and blower 9;

[0074] The anoxic tank 2, the aerobic tank 3, the MBR membrane tank 4 and the clean water tank 6 are all integrated in the main tank body and connected in sequence from front to back to form an integrated structural system;

[0075] The pretreatment inlet 1 at the front end of the anoxic tank 2 receives the pretreated effluent, which is generally pretreated by grid, flotation and hydrolysis acidification and other pretreatment technologies. The effluent of the MBR membrane tank can be connected to a reverse osmosis membrane or other further treatment equipment.

[0076] This system includes two-stage reflow, namely the reflow from aerobic pool 3 to anoxic pool 2, which is realized by the first reflow pipe, and the reflow ratio is between 2 and 5. When the reflow ratio is large, a large amount of nitrate nitrogen and nitrite nitrogen return to the anoxic pool. Sufficient substrate ensures that the denitrifying bacteria can fully carry out denitrification activities and consume more carbon sources. Therefore, the large-scale reflow has a positive effect on COD removal. The reflow from the MBR membrane pool to the aerobic pool is realized by the second reflow pipe, and the reflow ratio is between 4 and 9 to prevent the pollution of the inner membrane of the MBR membrane pool.

[0077] There are two aeration methods in this system. One is that the blower aerates the aerobic tank and the MBR membrane tank. The air-water ratio in the aerobic zone is above 40:1, and the air-water ratio in the membrane tank is above 20:1. This blower equipment is always on. The other is a centrifugal submersible aerator with an air-water ratio of more than 40:1. It is only arranged in the aerobic tank and turned on according to the water inlet needs and the sludge accumulation during operation.

[0078] See also Figure 2 When the printing and dyeing wastewater is treated by emergency biochemical treatment through this system, the method is as follows:

[0079] The printing and dyeing wastewater enters from the pre-treated water inlet 1, and flows through the anoxic tank 2, the aerobic zone 1 301 and the aerobic zone 2 302 of the aerobic tank 3 in sequence, wherein a flow pusher 11 is arranged in the anoxic tank 2 to ensure the water circulation in the anoxic tank 2, and the wastewater enters the aerobic zone 1 301 from the anoxic tank 2 through the water hole 1 21 on the first partition, and enters the aerobic zone 2 302 from the aerobic zone 1 301 through the water hole 2 22 on the second partition, and enters the MBR membrane tank 4 through the aerobic tank to membrane tank water inlet pipe 24 through the water pump 1 12 in the aerobic zone 202. The aeration membrane box 15 in the MBR membrane tank 4, under the action of the water pump 3 14, extracts the filtered water through the membrane tank to the clear water tank water inlet pipe 25 into the clear water tank 6 in the equipment room 5, and the treated sewage in the clear water tank 6 is discharged from the system through the treated outlet 7.

[0080] The system is provided with two-stage reflux, wherein water is pumped by water pump 12 through the first reflux pipe 26 from the aerobic zone 2 302 to the anoxic pool 2, and water is pumped by water pump 2 13 through the second reflux pipe 27 from the MBR membrane pool 4 to the aerobic pool 301. The water pumped out by water pump 12 is controlled by the first group of valves 16 through the pump outlet main pipe 23, and the regulated water volume is reasonably distributed to the aerobic pool to membrane pool water inlet pipe 24 and the first reflux pipe 26.

[0081] The aerobic pool of this system is provided with double aeration. For the first aeration, the blower 9 adjusts the gas volume through the aerobic pool aeration main air inlet pipe 28, and under the control of the second set of valves 17, enters the aerobic zone 1 301 and the aerobic zone 2 302 of the aerobic pool 3 through the first aeration pipe 29 and the second aeration pipe 30 respectively. The gas enters the water body for aeration through the biochemical aeration equipment 18 and the biochemical aeration equipment 19; the second aeration is performed by two submersible aerators 10 respectively arranged in the aerobic zone 1 301 and the aerobic zone 2 302. In addition, the aeration membrane box 15 in the MBR membrane pool 4 is provided by the blower 9 through the membrane pool air inlet pipe 31. Under the control of pipelines and fittings, water pump 3 14 can be used as a water inlet pump for the clean water tank 6 as well as a backwash pump and a chemical washing pump for the aeration membrane box 15. The reagent in the MBR cleaning reagent box 8 is connected to water pump 3 14 through a chemical washing pipe 32. At this time, water pump 3 14 can also be used as a chemical washing pump. There are many pipelines and fittings here, which are not the main content of this system. Only the main content is expressed. The printing and dyeing wastewater has a high organic content and needs to be discharged regularly. In the system, a discharge port 33 is set in the MBR membrane tank 4 for discharge.

[0082] The first aeration device 18 and the second aeration device 19 of the aerobic aeration device may be disc aeration, plate aeration or other forms.

[0083] The actual dosage of the activated carbon dosing device 20 of the utility model system is determined by the following activated carbon dosage experiment:

[0084] When the activated carbon concentration is greater than 0.5g / L, the COD removal rate can reach 50%. Further optimization of the dosage, when the activated carbon granules dosage is set at 1g / L and 2g / L, the COD removal effect with reaction time is shown in Figure 3 When the reaction time is 10 minutes, the activated carbon adsorption effect is basically stable. When the reaction time is extended to 120 minutes, the COD removal optimization effect is not obvious. When the reaction time is 20 minutes, the influent COD is 98 mg / L, and the effluent COD is 40 mg / L under the conditions of 1g / L and 2g / L dosage, respectively (see Figure 3 A line in) and 20 mg / L (see Figure 3 The B line in the figure shows that the effluent water is significantly improved when the dosage is 2g / L COD. Combined with the actual needs of the project, the actual dosage of activated carbon in the utility model system is 1g / L.

[0085] MBR effluent water quality index table before adding activated carbon

[0086] project Numeric COD,ppm 98 pH 7.88 Cl,ppm 420 TDS,ppm 6200

[0087] The activated carbon dosage was selected as 1g / L, and the removal effect of activated carbon on organic matter in sewage was further studied. LC-OCD was used to analyze the organic matter components, and it was found that the organic matter was composed of 26% hydrophobic organic matter (HOC) and 74% hydrophilic organic matter (CDOC). Both types of organic matter were well removed by MAC adsorption, with HOC removal rate of 71% and CDOC removal rate of 63% (measured in TOC).

[0088] It can be known that the equipment and reflux method of the system of the utility model are preferred methods, and other similar equipment can also be used. For example, the disc aerator can be replaced by tube aerator, plate aerator or other aeration methods; the centrifugal submersible aerator can be replaced by other forms of submersible aerators, and the model, number of units and position of the submersible aerator can be set as needed.

[0089] From the above, it can be seen that the system of the embodiment of the utility model improves the biochemical treatment capacity of the system by adopting the anoxic-aerobic-MBR process and combining the PACT activated carbon technology. By adjusting the amount of activated carbon added, different improvement effects can be achieved on the biochemical system, thereby improving the emergency treatment capacity of the biochemical system. In addition, the aerobic pool aeration adopts disc aeration combined with centrifugal submerged aeration, which enhances the aeration and oxygen supply capacity of the system. The combination of the two aeration methods can cope with the deterioration of the effluent water quality caused by the fluctuation of the dissolved oxygen value caused by the fluctuation of the sludge concentration in the system. In addition, the combination of the two aeration methods can avoid the sludge bottom siltation caused by the long-term operation of the equipment due to the large bubbles when the centrifugal submerged aeration equipment is turned on, thereby ensuring a good aerobic state in the aerobic pool, improving the stability of the treatment of the system, and better coping with the impact of acute changes in the inlet water quality on the effluent. The system has well solved the problems of high organic pollutant content, difficulty in degradation, high sludge concentration, and difficulty in biochemical system treatment in printing and dyeing wastewater.

[0090] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. An emergency biochemical treatment system for printing and dyeing wastewater, characterized in that: include: The main tank body, anoxic tank, aerobic tank, MBR membrane tank, clean water tank, submersible aerator, activated carbon dosing device and blower; among them, The anoxic tank, aerobic tank, MBR membrane tank, clean water tank, activated carbon dosing device and blower are all integrated in the main tank body; The anoxic tank is provided with a pre-treated water inlet at the front end and a water outlet at the rear end, and the water outlet is connected to the aerobic tank and the MBR membrane tank in sequence; The aerobic tank is connected back to the anoxic tank via a first reflux pipe; The MBR membrane tank is connected back to the aerobic tank through a second reflux pipe; A submersible aerator is arranged in the aerobic pool; Aerobic aeration equipment is arranged at the bottom of the aerobic pool; The activated carbon dosing device is connected to the aerobic tank; A biochemical aeration device is arranged at the bottom of the MBR membrane pool; The two air supply ports of the blower are respectively connected to the aerobic aeration equipment and the biochemical aeration equipment; The rear end water outlet of the MBR membrane pool is connected to the clean water pool, and the MBR membrane pool is provided with a mud discharge outlet; The clean water tanks are respectively provided with treated water outlets.

2. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 is characterized in that: The anoxic pool is arranged at the front end of the main pool body, and a flow pusher is arranged in the anoxic pool; The rear end of the anoxic pool is separated from the aerobic pool by a first partition, and a water hole 1 connected to the aerobic pool is provided on the first partition; The flow promoter and the water passage hole are arranged staggered.

3. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 or 2, characterized in that: The aerobic pool is arranged in the middle part of the main pool body, and the aerobic pool is composed of an aerobic zone 1 and an aerobic zone 2 arranged in sequence from front to back, the front end of the aerobic zone 1 is connected to the anoxic pool, and the rear end of the aerobic zone 1 is separated from the aerobic zone 2 by a second partition, and a water hole 2 connected to the aerobic zone 2 is arranged on the second partition; The aerobic aeration equipment is composed of a first aeration equipment laid at the bottom of the aerobic zone 1 and a second aeration equipment laid at the bottom of the aerobic zone 2, wherein the first aeration equipment is connected to the blower via a second set of valves and an aeration main air inlet pipe; The biochemical aeration equipment is connected to the blower via the membrane tank air inlet pipe; The submersible aerator is composed of a first submersible aerator and a second submersible aerator. The first submersible aerator is arranged in the aerobic zone 1, and the second submersible aerator is arranged in the aerobic zone 2.

4. The printing and dyeing wastewater emergency biochemical treatment system according to claim 3 is characterized in that: The first aeration device is composed of a first aeration coil pipe laid on the bottom of the aerobic zone 1 and a plurality of aeration plates evenly arranged on the first aeration coil pipe; The second aeration device is composed of a second aeration coil pipe laid on the bottom of the second aerobic zone and a plurality of aeration plates evenly arranged on the second aeration coil pipe.

5. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 or 2, characterized in that: The MBR membrane pool is arranged at the rear end of the main pool body and is separated from the rear end of the aerobic zone II of the aerobic pool by a third partition; The aerobic zone 2 is connected to the MBR membrane pool through a water pump 1 and a water inlet pipe provided with a first set of valves.

6. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 or 2, characterized in that: The biochemical aeration equipment in the MBR membrane pool adopts an aeration membrane box, and the aeration membrane box is connected to the blower through a membrane pool air inlet pipe.

7. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 or 2, characterized in that: An equipment room is also arranged at the rear end of the main pool body, and the clean water tank, MBR membrane pool reagent box and blower are arranged in the equipment room respectively, and a water pump 3 is also arranged in the equipment room; The water pump is connected to the outlet pipe, one end of the outlet pipe is connected to the MBR membrane tank, the other end of the outlet pipe is connected to the clean water tank, and the other end of the outlet pipe is connected to the backwash end of the aeration membrane box in the MBR membrane tank; The water pump is connected to the MBR membrane tank through a dosing pipeline; A drainage outlet is arranged at the rear end of the clean water tank, and a mud discharge outlet is arranged at the bottom.

8. The printing and dyeing wastewater emergency biochemical treatment system according to claim 1 or 2, characterized in that: The first return pipe is laid in the main tank body, the first return pipe is connected to a water pump 1 arranged in the aerobic zone 2 of the aerobic tank through a first set of valves, and the rear end of the first return pipe is connected to the front end of the anoxic tank; The second reflux pipe is laid in the main tank body, the front end of the second reflux pipe is connected to the water pump 2 arranged in the MBR membrane tank, and the rear end is connected to the aerobic zone 2.

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