Printing and dyeing wastewater treatment modular device based on coagulating sedimentation-biological treatment process and printing and dyeing wastewater treatment method

Abstract

The invention discloses a printing and dyeing wastewater treatment modular device based on a coagulating sedimentation-biological treatment process and a printing and dyeing wastewater treatment method, and aims to solve the problems of low organic matter removal efficiency, turbid effluent and the like which are easily caused by anaerobic treatment of printing and dyeing wastewater. The printing and dyeing wastewater treatment modular device is characterized in that a pretreatment tank, a mixed dosing-flocculation tank, a primary sedimentation tank, a UASB (Upflow Anaerobic Sludge Blanket) tank, a hydrolysis acidification tank, an anaerobic sedimentation tank, an aerobic reaction tank and a secondary sedimentation tank are sequentially arranged in an integrated box body along a water flow direction, the baffle plate in each hydrolysis unit is filled with a combined filler, the aerobic reaction tank is composed of a plurality of aerobic units connected in series, and the baffle plate in each aerobic unit is filled with an aerobic filler. By adopting a coagulating sedimentation-biological treatment process, high-chroma printing and dyeing wastewater can be treated, the removal rate of COD (Chemical Oxygen Demand) reaches 85% or above, the removal rate of ammonia nitrogen reaches 95% or above, and an excellent purification effect is shown.

Description

Technical Field

[0001] The invention relates to a water treatment device based on a coagulation sedimentation-biological treatment process and a method for treating printing and dyeing wastewater by using the water treatment device. Background Art

[0002] Printing and dyeing wastewater has always been the focus of attention in the industry and scientific research field due to its complex composition and high pollution load. At present, many sewage treatment plants use a combination of coagulation and anaerobic treatment to treat printing and dyeing wastewater. Coagulation treatment can effectively remove suspended matter and some organic pollutants in water by adding flocculants and coagulants, but it also increases the consumption and cost of reagents. Anaerobic treatment can degrade organic matter in wastewater, reduce chemical oxygen demand (COD), and produce biogas as energy recovery. However, problems such as low organic matter removal efficiency and turbid effluent may occur during anaerobic treatment, affecting the treatment effect and effluent water quality. Printing and dyeing wastewater treatment plants are currently generally faced with the challenge of treating high-salinity, high-concentration, difficult-to-degrade organic wastewater. These wastewaters contain a large amount of inorganic salts, difficult-to-degrade toxic additives, and stubborn dyes, which bring a huge burden to the existing treatment process. In order to improve the treatment efficiency and ensure that the effluent quality meets the standards, the water plant needs to optimize the process in the front-end coagulation process and biological treatment part.

[0003] At the same time, the printing and dyeing textile industry has shown a new development trend of spreading to small and medium-sized towns. A large number of small and medium-sized printing and dyeing textile enterprises have the demand for direct discharge of wastewater into natural water bodies. A small-scale modular printing and dyeing wastewater treatment equipment is urgently needed to solve industry problems such as small water volume, large water quality changes and high water discharge standards. Summary of the invention

[0004] The present invention aims to solve the problems of low organic matter removal efficiency and turbid effluent in anaerobic treatment of printing and dyeing wastewater, and provides a modular device and method for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process.

[0005] The modular device for treating printing and dyeing wastewater based on the coagulation sedimentation-biological treatment process of the present invention comprises an integrated box, a pretreatment tank, a UASB tank, a mixed dosing-flocculation tank, a primary sedimentation tank, a hydrolysis acidification tank, an anaerobic sedimentation tank, an aerobic reaction tank and a secondary sedimentation tank. The pretreatment tank, the mixed dosing-flocculation tank, the primary sedimentation tank, the UASB tank, the hydrolysis acidification tank, the anaerobic sedimentation tank, the aerobic reaction tank and the secondary sedimentation tank are sequentially arranged in the integrated box along the water flow direction. Mud discharge ports are provided at the bottoms of the mixed dosing-flocculation tank, the primary sedimentation tank, the hydrolysis acidification tank, the anaerobic sedimentation tank, the aerobic reaction tank and the secondary sedimentation tank, and a water discharge port is provided at the top of the secondary sedimentation tank.

[0006] A microporous aeration plate is arranged at the bottom of the pretreatment tank, and ferrous salt reagent is added to the pretreatment tank; the mixed dosing-flocculation tank is divided into a mixed dosing tank and a stirring tank by a partition, and flocculant is added to the mixed dosing tank; a water distribution pipe is arranged at the bottom of the UASB tank, and the UASB tank is connected to the previous primary sedimentation tank through the water distribution pipe, and a three-phase separator is arranged at the upper part of the UASB tank;

[0007] The hydrolysis acidification tank is composed of a plurality of hydrolysis units connected in series, each of which is provided with a hydrolysis acidification filler baffle, the hydrolysis acidification filler baffle is filled with a composite filler, a water distribution pipe is provided at the bottom of the hydrolysis acidification filler baffle, the other end of the water distribution pipe is connected to the water outlet of the previous hydrolysis unit, and a stirrer is provided at the top of each hydrolysis unit;

[0008] The aerobic reaction tank is composed of multiple aerobic units connected in series. Each aerobic unit is provided with a baffle, which is filled with aerobic fillers. A water distribution pipe is provided at the bottom of the baffle, and the other end of the water distribution pipe is connected to the water outlet of the previous aerobic unit. A microporous aeration disk is provided below the baffle.

[0009] The method for treating printing and dyeing wastewater by using a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process is implemented according to the following steps:

[0010] 1. The printing and dyeing wastewater flows into the pretreatment tank, and ferrous salt reagent is added to the pretreatment tank, and aeration is performed for oxidation reaction. The effluent from the pretreatment tank flows into the mixed dosing-flocculation tank, and ferrous chloride and sodium hydroxide are added to the mixed dosing tank for flocculation reaction. After being stirred in the stirring tank, the printing and dyeing wastewater flows into the primary sedimentation tank for solid-liquid separation. The supernatant in the primary sedimentation tank overflows into the UASB tank, and the anaerobic sludge in the UASB tank is used to degrade the pollutants in the printing and dyeing wastewater;

[0011] 2. The effluent from the UASB tank overflows into the hydrolysis acidification tank for hydrolysis treatment to obtain hydrolyzed wastewater;

[0012] 3. The wastewater after hydrolysis in the hydrolysis acidification tank overflows into the anaerobic sedimentation tank for solid-liquid separation. The effluent from the anaerobic sedimentation tank overflows into the aerobic reaction tank for biochemical treatment. The effluent from the aerobic reaction tank overflows into the secondary sedimentation tank for solid-liquid separation. Part of the sludge at the bottom of the secondary sedimentation tank flows back to the hydrolysis acidification tank, UASB tank and aerobic reaction tank to complete the treatment of printing and dyeing wastewater.

[0013] In the pretreatment tank of the modular device for treating printing and dyeing wastewater based on the coagulation sedimentation-biological treatment process of the present invention, ferrous reagent is added, and the pretreatment tank mainly receives discolored wastewater irregularly generated in the printing and dyeing textile process, wherein the pollution indicators such as COD and chromaticity are relatively high, and the device contains a large amount of sulfite ions and organic dyes which have inhibitory and toxic effects on microorganisms. Such wastewater is difficult to be treated by conventional printing and dyeing wastewater treatment processes. By setting up the pretreatment tank, sulfite ions are oxidized by oxygen under the catalysis of ferrous ions, thereby improving the biodegradability of the discolored wastewater and enhancing the impact resistance of the device for treating printing and dyeing (fading) wastewater.

[0014] The UASB pool mainly solves the impact of high-concentration organic matter on the biological treatment system at the front end. It uses granular sludge with high treatment efficiency, good impact resistance and long sludge age to pre-treat toxic and harmful high-concentration organic wastewater before hydrolysis and acidification, further improving the biodegradability of wastewater and reducing the organic load of subsequent biological treatment units. The internal tubular mesh filler has the characteristics of fast biofilm growth and high biomass load. At the same time, there is a large amount of granular sludge at the bottom of the device, which jointly promotes the treatment efficiency of the UASB unit. A standard three-phase separator is set on the top to effectively collect gases such as methane produced by the reaction.

[0015] Compared with the prior art, the modular device for treating printing and dyeing wastewater and the water treatment method based on the coagulation sedimentation-biological treatment process of the present invention have the following beneficial effects:

[0016] (1) The sewage treatment equipment and sewage treatment process adopts coagulation sedimentation-biological treatment process, which has strong impact resistance and can treat high-chroma printing and dyeing wastewater. Combined with coagulation and dosing control equipment, it can effectively treat printing and dyeing wastewater with different components under different working conditions in different seasons;

[0017] (2) The combined functional filler has strong microbial enrichment ability and long service life. Combined with the loaded sodium anthraquinone-2-sulfonate, it can greatly reduce the time required for biofilm formation in the biological treatment system and start quickly;

[0018] (3) The modular sub-tank design structure can adapt to the huge changes in water volume and obvious differences in water quality components in different scenarios by adjusting the device operation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process of the present invention;

[0020] Numbers in the figure: 1—hydrolysis and acidification filler baffle, 2—guide tube, 3—control system, 4—mixing and dosing-flocculation tank, 5—water distribution pipe, 6—microporous aeration plate, 7—baffle (polymer material woven biofilm baffle), 8—agitator, 9—sludge hopper, 10—sludge outlet, 11—overflow weir, 12—dosing module, 13—primary sedimentation tank, 14—hydrolysis and acidification tank, 15—anaerobic sedimentation tank, 16—aerobic reaction tank, 17—secondary sedimentation tank, 18—pretreatment tank, 19—UASB tank. DETAILED DESCRIPTION

[0021] Specific implementation method one: The modular device for treating printing and dyeing wastewater based on the coagulation sedimentation-biological treatment process in this implementation method comprises an integrated box, a pretreatment tank 18, a UASB tank 19, a mixed dosing-flocculation tank 4, a primary sedimentation tank 13, a hydrolysis acidification tank 14, an anaerobic sedimentation tank 15, an aerobic reaction tank 16 and a secondary sedimentation tank 17. The pretreatment tank 18, the mixed dosing-flocculation tank 4, the primary sedimentation tank 13, the UASB tank 19, the hydrolysis acidification tank 14, the anaerobic sedimentation tank 15, the aerobic reaction tank 16 and the secondary sedimentation tank 17 are sequentially arranged in the integrated box along the water flow direction. A mud discharge port 10 is opened at the bottom of the mixed dosing-flocculation tank 4, the primary sedimentation tank 13, the hydrolysis acidification tank 14, the anaerobic sedimentation tank 15, the aerobic reaction tank 16 and the secondary sedimentation tank 17, and a drainage port is opened at the upper part of the secondary sedimentation tank 17;

[0022] A microporous aeration plate 6 is provided at the bottom of the pretreatment tank 18, and ferrous salt reagent is added to the pretreatment tank 18; the mixed dosing-flocculation tank 4 is divided into a mixed dosing tank 4-1 and a stirring tank 4-2 by a partition, and flocculant is added to the mixed dosing tank 4-1; a water distribution pipe 5 is provided at the bottom of the UASB tank 19, and the UASB tank 19 is connected to the previous primary sedimentation tank 13 through the water distribution pipe 5, and a three-phase separator 19-1 is provided at the upper part of the UASB tank 19;

[0023] The hydrolysis acidification tank 14 is composed of a plurality of hydrolysis units connected in series, each of which is provided with a hydrolysis acidification filler baffle 1, the hydrolysis acidification filler baffle 1 is filled with a composite filler, a water distribution pipe 5 is provided at the bottom of the hydrolysis acidification filler baffle 1, and the other end of the water distribution pipe 5 is connected to the water outlet of the previous hydrolysis unit, and a stirrer 8 is provided at the top of each hydrolysis unit;

[0024] The aerobic reaction tank 16 is composed of a plurality of aerobic units connected in series, each of which is provided with a baffle 7 filled with aerobic filler, a water distribution pipe 5 is provided at the bottom of the baffle 7, the other end of the water distribution pipe 5 is connected to the water outlet of the previous aerobic unit, and a microporous aeration disk 6 is provided below the baffle 7.

[0025] In this embodiment, a control system 3 and a dosing module 12 are provided at the lower part of the mixed dosing-flocculation tank 4 , and the dosing module 12 is used to add reagents into the mixed dosing-flocculation tank 4 .

[0026] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that the mixed dosing-flocculation tank 4, the primary sedimentation tank 13, the UASB tank 19, the hydrolysis acidification tank 14, the anaerobic sedimentation tank 15, the aerobic reaction tank 16 and the secondary sedimentation tank 17 are connected through the overflow weir 11.

[0027] Specific implementation method three: This implementation method is different from specific implementation methods one or two in that a guide tube 2 is vertically arranged in the primary sedimentation tank 13 and the anaerobic sedimentation tank 15 respectively.

[0028] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the preparation process of the combined filler is as follows:

[0029] The hollow suspension sphere is filled with activated carbon (with high iodine value), immersed in an anthraquinone-2-sodium sulfonate solution with a water temperature of 45 to 55° C. for 1 to 2 days to obtain a composite filler.

[0030] The combined filler of this embodiment can shorten the sludge culture time by loading anthraquinone-2-sulfonate sodium on activated carbon.

[0031] Specific embodiment 5: This embodiment is different from specific embodiments 1 to 4 in that a sludge hopper 9 is provided at the bottom of each hydrolysis unit.

[0032] Specific implementation method 6: This implementation method is different from any one of specific implementation methods 1 to 5 in that the aerobic filler is a curtain-type biological filler.

[0033] Specific embodiment 7: This embodiment is different from specific embodiments 1 to 6 in that a sludge return pipe is connected to the bottom of the secondary sedimentation tank 17, and the other end of the sludge return pipe is connected to the hydrolysis acidification tank 14 and the aerobic reaction tank 16 respectively.

[0034] In this embodiment, the sludge from the secondary sedimentation tank is returned to the aerobic reaction tank for a long time to maintain the sludge concentration MLSS in the aerobic reaction tank and improve the removal effect of ammonia nitrogen; it is partially returned to the hydrolysis acidification tank from time to time to supplement the sludge concentration in the hydrolysis acidification tank with aerobic sludge.

[0035] Specific implementation method eight: This implementation method uses a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process to treat printing and dyeing wastewater according to the following steps:

[0036] 1. The printing and dyeing wastewater flows into the pretreatment tank 18, and ferrous salt reagent is added to the pretreatment tank 18, and aeration is performed for oxidation reaction. The effluent of the pretreatment tank 18 flows into the mixed dosing-flocculation tank 4, and ferrous chloride and sodium hydroxide are added to the mixed dosing tank 4-1 for flocculation reaction. The printing and dyeing wastewater stirred in the stirring tank 4-2 flows into the primary sedimentation tank 13 for solid-liquid separation, and the supernatant in the primary sedimentation tank 13 overflows into the UASB tank 19, and the anaerobic sludge in the UASB tank 19 is used to degrade the pollutants in the printing and dyeing wastewater;

[0037] 2. The effluent from the UASB tank 19 overflows into the hydrolysis acidification tank 14 for hydrolysis treatment to obtain hydrolyzed wastewater;

[0038] 3. The wastewater after hydrolysis in the hydrolysis acidification tank 14 overflows into the anaerobic sedimentation tank 15 for solid-liquid separation. The effluent of the anaerobic sedimentation tank 15 overflows into the aerobic reaction tank 16 for biochemical treatment. The effluent of the aerobic reaction tank 16 overflows into the secondary sedimentation tank 17 for solid-liquid separation. The sludge at the bottom of the secondary sedimentation tank 17 partially flows back to the hydrolysis acidification tank 14, the UASB tank 19 and the aerobic reaction tank 16 to complete the treatment of the printing and dyeing wastewater.

[0039] In this embodiment, when high-concentration organic wastewater is continuously discharged, the HRT of the hydrolysis acidification tank can be controlled to be 12-48 hours, the HRT of the aerobic tank can be controlled to be 12-24 hours, and the total HRT of the equipment can be controlled to be 24-72 hours.

[0040] Specific embodiment 9: The difference between this embodiment and specific embodiment 8 is that in step 1, the hydraulic retention time HRT of the hydrolysis acidification tank 14 is controlled to be 2-4 hours.

[0041] Specific embodiment ten: The difference between this embodiment and specific embodiment eight or nine is that in step one, the hydraulic retention time HRT of the aerobic reaction tank 16 is controlled to be 4-6 hours.

[0042] Embodiment: This embodiment uses a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process to treat printing and dyeing wastewater according to the following steps:

[0043] 1. The printing and dyeing wastewater flows into the pretreatment tank 18, and ferrous salt reagent is added to the pretreatment tank 18, and aeration is performed for oxidation reaction for 40 minutes. The effluent of the pretreatment tank 18 flows into the mixed dosing-flocculation tank 4, and ferrous chloride and sodium hydroxide are added to the mixed dosing tank 4-1 for flocculation reaction for 30 minutes. The printing and dyeing wastewater stirred in the stirring tank 4-2 flows into the primary sedimentation tank 13 for solid-liquid separation, and the supernatant in the primary sedimentation tank 13 overflows into the UASB tank 19. The anaerobic sludge in the UASB tank 19 is used to degrade the pollutants in the printing and dyeing wastewater, and the hydraulic retention time of the UASB tank 19 is controlled to be 12 hours;

[0044] 2. The effluent from the UASB tank 19 overflows into the hydrolysis acidification tank 14 for hydrolysis treatment, and the hydrolysis acidification time is controlled to be 24 hours to obtain the hydrolyzed wastewater;

[0045] 3. The wastewater after hydrolysis in the hydrolysis acidification tank 14 overflows into the anaerobic sedimentation tank 15 for solid-liquid separation. The effluent of the anaerobic sedimentation tank 15 overflows into the aerobic reaction tank 16 for biochemical treatment. The hydraulic retention time of the aerobic reaction tank 16 is controlled to be 12 hours. The effluent of the aerobic reaction tank 16 overflows into the secondary sedimentation tank 17 for solid-liquid separation. The sludge at the bottom of the secondary sedimentation tank 17 partially flows back to the hydrolysis acidification tank 14, the UASB tank 19 and the aerobic reaction tank 16 to complete the treatment of the printing and dyeing wastewater.

[0046] The hydrolysis acidification tank 14 in the modular device for treating printing and dyeing wastewater based on the coagulation sedimentation-biological treatment process of this embodiment is composed of four hydrolysis units connected in series, and the aerobic reaction tank 16 is composed of two aerobic units connected in series. The UASB tank 19 is filled with tubular mesh fillers filled with anaerobic granular sludge, and a three-phase separator 19-1 is arranged on the upper part of the UASB tank 19.

[0047] In this embodiment, the printing and dyeing wastewater is lifted and then enters the pretreatment tank 18 for oxidation reaction treatment, and then flows into the mixed dosing-flocculation tank, after adding coagulants such as ferrous chloride and sodium hydroxide and mixing through a stirring device to form alum flowers, solid-liquid separation is carried out in the primary sedimentation tank, and sludge is formed after coagulation and precipitation, and enters the primary sedimentation tank mud hopper and then quickly discharged. After coagulation, the effluent pH is adjusted back to neutral at the end of the primary sedimentation tank and enters the UASB tank, and the COD in the water is greatly reduced by using anaerobic sludge, and then overflows to the hydrolysis acidification tank. Then remove part of the COD, most of the total phosphorus and chromaticity; the primary sedimentation tank is discharged with high frequency to ensure the phosphorus removal effect; the sewage in the hydrolysis acidification tank overflows to the anaerobic sedimentation tank for solid-liquid separation to prevent anaerobic sludge from entering the aerobic tank; the effluent from the anaerobic sedimentation tank overflows to the aerobic tank to remove part of the COD and chromaticity and improve the biodegradability of printing and dyeing wastewater; the effluent from the aerobic tank overflows into the secondary sedimentation tank for solid-liquid separation. A reflux device and a sludge discharge device are set at the bottom of the secondary sedimentation tank, and part of the sludge flows back to the hydrolysis acidification tank and the aerobic tank.

[0048] The equipment is supplied with air through a rotary blower. The aeration air circuit is connected to the aeration air inlet of the equipment. The aeration air circuit includes one main air pipe and two branch pipes. Each branch of the aeration air circuit adjusts the air volume through an electromagnetic flow meter and a ball valve.

[0049] An intelligent dosing system is installed in the coagulation dosing tank to adjust the dosage in real time according to the inlet and outlet water quality.

[0050] The startup method of the modular treatment device for printing and dyeing wastewater is that the equipment is started by inoculating sludge. First, the activated sludge from the printing and dyeing wastewater treatment plant with similar working conditions to the treatment object is inoculated into the device, and the hydrolysis and acidification zone is circulated internally at a large flow rate and glucose is appropriately added. The aerobic reaction tank is aerated at a large flow rate and a proper amount of glucose is added. The startup cycle is 7-15 days. If the reactor is operated in biofilm mode, it is necessary to appropriately increase the contact area between the activated sludge and the biofilm, and discharge the excess activated sludge after the startup is completed.

[0051] When microbial inhibitory pollutants appear in the influent water and the effluent from the biological treatment system cannot meet the discharge standards, the rear end of the secondary sedimentation tank of this equipment can be connected to a deep treatment system to remove the remaining pollutants through coagulation sedimentation, advanced oxidation and other methods.

[0052] The printing and dyeing wastewater treatment modular device and the printing and dyeing wastewater treatment method of this embodiment are used to treat the printing and dyeing wastewater of the Longgang New Town Textile Industry Promotion Park in Longgang City, Zhejiang Province. The pollution indicators of the influent are as follows:

[0053] Conventional printing and dyeing wastewater:

[0054] pH <![CDATA[COD cr ]]> <![CDATA[NH3-N]]> TN TP aniline 8.21 2024 12.68 25.51 4.06 4.61

[0055] High concentration discoloration wastewater:

[0056] pH <![CDATA[COD cr ]]> <![CDATA[NH3-N]]> TN TP aniline 8.45 10200 15.30 31.24 5.58 273.56

[0057] After the typical printing and dyeing wastewater enters the modular device for treating printing and dyeing wastewater, the effluent data of each process section are as follows:

[0058]

[0059] It can be seen from the above effluent data that the modular device for treating printing and dyeing wastewater based on the coagulation sedimentation-biological treatment process and the water treatment method of the present invention show excellent purification effect, with the COD removal rate reaching more than 85%, and the removal rate of difficult-to-degrade toxic and harmful substances represented by aniline being more than 90%. The effluent from the secondary sedimentation tank meets GB 4287-2012 "Emission Standard of Water Pollutants for Textile Dyeing and Finishing Industry".

Claims

1. Modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process, characterized by The modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process comprises an integrated box, a pretreatment tank (18), a UASB tank (19), a mixed dosing-flocculation tank (4), a primary sedimentation tank (13), a hydrolysis acidification tank (14), an anaerobic sedimentation tank (15), an aerobic reaction tank (16) and a secondary sedimentation tank (17). The pretreatment tank (18), the mixed dosing-flocculation tank (4), the primary sedimentation tank (13), the UASB tank (19), the hydrolysis acidification tank (14), the anaerobic sedimentation tank (15), the aerobic reaction tank (16) and the secondary sedimentation tank (17) are sequentially arranged in the integrated box along the water flow direction. Mud discharge ports (10) are provided at the bottom of the mixed dosing-flocculation tank (4), the primary sedimentation tank (13), the hydrolysis acidification tank (14), the anaerobic sedimentation tank (15), the aerobic reaction tank (16) and the secondary sedimentation tank (17), and a water discharge port is provided at the top of the secondary sedimentation tank (17). A microporous aeration plate (6) is arranged at the bottom of the pretreatment tank (18), and a ferrous salt agent is added to the pretreatment tank (18); the mixed dosing-flocculation tank (4) is divided into a mixed dosing tank (4-1) and a stirring tank (4-2) by a partition, and a flocculant is added to the mixed dosing tank (4-1); a water distribution pipe (5) is arranged at the bottom of the UASB tank (19), and the UASB tank (19) is connected to the previous primary sedimentation tank (13) through the water distribution pipe (5), and a three-phase separator (19-1) is arranged on the upper part of the UASB tank (19); The hydrolysis acidification tank (14) is composed of a plurality of hydrolysis units connected in series, each of which is provided with a hydrolysis acidification filler baffle (1), the hydrolysis acidification filler baffle (1) is filled with a composite filler, a water distribution pipe (5) is provided at the bottom of the hydrolysis acidification filler baffle (1), the other end of the water distribution pipe (5) is connected to the water outlet of the previous hydrolysis unit, and a stirrer (8) is provided at the top of each hydrolysis unit; The aerobic reaction tank (16) is composed of a plurality of aerobic units connected in series, each aerobic unit is provided with a baffle (7), the baffle (7) is filled with aerobic fillers, a water distribution pipe (5) is provided at the bottom of the baffle (7), the other end of the water distribution pipe (5) is connected to the water outlet of the previous aerobic unit, and a microporous aeration disk (6) is provided below the baffle (7).

2. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that The mixed dosing-flocculation tank (4), the primary sedimentation tank (13), the UASB tank (19), the hydrolysis acidification tank (14), the anaerobic sedimentation tank (15), the aerobic reaction tank (16) and the secondary sedimentation tank (17) are connected to each other via an overflow weir (11).

3. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that A flow guide tube (2) is vertically arranged in the primary sedimentation tank (13) and the anaerobic sedimentation tank (15), respectively.

4. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that The preparation process of the combined filler is as follows: The hollow suspension sphere is filled with activated carbon, immersed in an anthraquinone-2-sodium sulfonate solution with a water temperature of 45 to 55° C. for 1 to 2 days to obtain a composite filler.

5. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that A sludge hopper (9) is provided at the bottom of each hydrolysis unit.

6. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that The aerobic filler is a curtain-type biological filler.

7. The modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process according to claim 1 is characterized in that A sludge return pipe is connected to the bottom of the secondary sedimentation tank (17), and the other end of the sludge return pipe is respectively connected to the hydrolysis acidification tank (14) and the aerobic reaction tank (16).

8. A method for treating printing and dyeing wastewater using the modular device for treating printing and dyeing wastewater based on coagulation sedimentation-biological treatment process as claimed in claim 1, characterized in that The method for treating printing and dyeing wastewater is implemented according to the following steps:

1. The printing and dyeing wastewater flows into the pretreatment tank (18), and ferrous salt reagent is added to the pretreatment tank (18), and aeration is performed to perform oxidation reaction. The effluent of the pretreatment tank (18) flows into the mixed dosing-flocculation tank (4), and ferrous chloride and sodium hydroxide are added to the mixed dosing tank (4-1) to perform flocculation reaction. The printing and dyeing wastewater after being stirred in the stirring tank (4-2) flows into the primary sedimentation tank (13) for solid-liquid separation. The supernatant in the primary sedimentation tank (13) overflows into the UASB tank (19), and the pollutants in the printing and dyeing wastewater are degraded by the anaerobic sludge in the UASB tank (19); 2. The effluent from the UASB tank (19) overflows into the hydrolysis acidification tank (14) for hydrolysis treatment to obtain hydrolyzed wastewater; 3. The wastewater after hydrolysis in the hydrolysis acidification tank (14) overflows into the anaerobic sedimentation tank (15) for solid-liquid separation. The effluent of the anaerobic sedimentation tank (15) overflows into the aerobic reaction tank (16) for biochemical treatment. The effluent of the aerobic reaction tank (16) overflows into the secondary sedimentation tank (17) for solid-liquid separation. The sludge at the bottom of the secondary sedimentation tank (17) partially flows back into the hydrolysis acidification tank (14), the UASB tank (19) and the aerobic reaction tank (16), thereby completing the treatment of the printing and dyeing wastewater.

9. A method for treating printing and dyeing wastewater using a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process, characterized in that In step 1, the hydraulic retention time HRT of the hydrolysis acidification tank (14) is controlled to be 2-4 hours.

10. A method for treating printing and dyeing wastewater using a modular device for treating printing and dyeing wastewater based on a coagulation sedimentation-biological treatment process, characterized in that In step 1, the hydraulic retention time HRT of the aerobic reaction tank (16) is controlled to be 4-6 hours.

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