Deep treatment multifunctional filter tank for printing and dyeing wastewater treatment plant

Abstract

The utility model discloses an advanced treatment multifunctional filter tank for a printing and dyeing wastewater treatment plant, which comprises a filter tank main body, and an antimony and phosphorus removal part and a denitrification part are arranged in the filter tank main body; the antimony and phosphorus removal part comprises a first filter tank and a first filler arranged in the first filter tank, a water inlet pipeline is arranged at the upper end of the filler, and a water outlet pipeline is arranged at the lower part of the filler; the denitrification part comprises a second filter tank and a second filler arranged in the second filter tank, the upper part of the second filler is provided with a water distribution pipeline communicated with the water outlet pipeline, and the lower part of the second filler is provided with a drainage channel. The method has a very high removal rate on trace antimony in the printing and dyeing wastewater, greatly reduces the use of a coagulation agent, does not produce antimony-containing hazardous waste sludge, realizes synchronous phosphorus removal, and reduces the cost of a phosphorus removal agent.

Description

Technical Field

[0001] The utility model relates to the technical field of printing and dyeing wastewater treatment, in particular to a multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plants. Background Art

[0002] Printing and dyeing wastewater originates from various processes in the textile dyeing and finishing process, including desizing, scouring, bleaching, mercerizing, and dyeing. The composition of these pollutants varies greatly, and printing and dyeing plants produce enormous amounts of wastewater. Every ton of textile consumed consumes 100-200 tons of water, of which 80%-90% is discharged as wastewater. Printing and dyeing wastewater is characterized by high water volume, high organic content, high alkalinity, and significant variability in water quality, making it one of the most difficult industrial wastewaters to treat.

[0003] Heavy metal antimony (Sb) in dyeing and printing wastewater primarily originates from the addition of antimony catalysts during the processing of polyester fiber materials and terylene in the textile industry, as well as antimony-containing auxiliaries during the finishing process. This metal is released into the wastewater downstream of the dyeing and printing industry. Consequently, antimony has been listed as a characteristic pollutant in textile and dyeing wastewater. Antimony has adverse effects on the human blood, gastrointestinal tract, and respiratory systems, and is also carcinogenic and teratogenic.

[0004] At present, the textile printing and dyeing industry generally adopts secondary treatment, and some areas adopt tertiary treatment. Conventional treatment processes are difficult to effectively reduce the content of antimony and organic matter, and it is increasingly difficult to meet the new and stringent standards. Utility Model Content

[0005] The purpose of the utility model is to provide a multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plants, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plants, comprising a filter tank body, wherein an antimony and phosphorus removal part and a denitrification part are arranged in the filter tank body;

[0008] The antimony and phosphorus removal unit includes a first filter tank and a first filler disposed in the first filter tank, wherein the upper end of the filler is provided with a water inlet pipe and the lower end of the filler is provided with a water outlet pipe;

[0009] The denitrification part includes a second filter tank and a second filler arranged in the second filter tank. A water distribution pipe connected to the water outlet pipe is arranged on the upper part of the second filler, and a drainage channel is arranged on the lower part of the second filler.

[0010] As a further solution of the present invention: the first filler includes a first contact layer, an adsorption layer, and a support layer in order from top to bottom.

[0011] As a further solution of the present invention: the first contact layer uses fine quartz sand with a particle size of 2-4 mm, and the height of the first contact layer H≤0.2 m; the adsorption layer uses pyrite sand with a particle size of 0.075-2 mm, and the height of the adsorption layer H≤2 m; the support layer uses gravel or pebbles with a particle size of 8 mm-12 mm, and the height of the support layer H≤0.2 m.

[0012] As a further solution of the present invention: a buffer tank is provided between the antimony and phosphorus removal part and the denitrification part, the outlet pipe is connected to the bottom of the buffer tank, the water distribution pipe is connected to the upper part of the buffer tank, and the height of the water distribution pipe is lower than the height of the water inlet pipe.

[0013] As a further solution of the present invention: the second filler includes, from top to bottom, a second contact layer, a filter material layer, and a supporting layer.

[0014] As a further solution of the present invention: the second contact layer uses coarse quartz sand with a particle size of 5-8mm, the height of the second contact layer H≤0.2m, the filter material layer uses a mixture of pyrite and limestone with a particle size of 2-5mm, a ratio of 4:1, the height H of the filter material layer is 1.5m-2.5m, the supporting layer uses gravel or pebbles with a particle size of 5-30mm, and is arranged in layers and grades. The height of each layer is 0.07m-0.1m, and the total height is 0.35m-0.5m.

[0015] As a further solution of the present invention: a drainage pipe is provided below the second filler, and the drainage pipe is connected to the drainage channel.

[0016] As a further solution of the present invention: a backwash pipe is provided above the second filler, a backwash irrigation channel is connected to the outside of the backwash pipe, and the backwash pipe is located above the water distribution pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This application utilizes a multifunctional combined filter tank that can achieve nitrogen, phosphorus, and antimony removal. Coagulation and sedimentation are commonly used in the treatment of printing and dyeing wastewater to remove antimony from the water, but this requires large amounts of reagents and is ineffective. Pyrite adsorption for antimony removal has a high removal rate for trace antimony in printing and dyeing wastewater, significantly reducing the use of coagulants, eliminating the generation of antimony-containing hazardous waste sludge, achieving simultaneous phosphorus removal, and reducing the cost of phosphorus removal reagents.

[0019] 2. This application adopts sulfur / iron autotrophic denitrification for denitrification, which does not require an external carbon source, reducing the cost of carbon source addition equipment and reagents; avoiding the penetration phenomenon caused by traditional carbon source addition; low sludge production rate, reducing sludge treatment and disposal costs; and can also increase carbon source addition according to actual site conditions, to achieve efficient combined heterotrophic / autotrophic denitrification treatment and reduce construction investment costs.

[0020] 3. This application can add an appropriate amount of limestone to the pyrite matrix according to the water quality and test results, and form a composite matrix layer through the optimization design of the composite ratio. It can not only neutralize the H+ produced during the denitrification process and maintain the pH within the appropriate range without the need for additional alkalinity; it can also use the generated Ca2+ to solve the problem of high concentrations of SO42- byproducts produced during the sulfur autotrophic denitrification process. The pyrite sand in the phosphorus and antimony removal area can be used as a supplement to the main layer matrix of the denitrification area. At the same time, pyrite sand is a natural ore and a common metal mineral in nature. The raw materials are easy to obtain and low in cost. It has high hardness and high mechanical strength. It can be used for a long time as a filter or wetland matrix and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of this embodiment;

[0022] In the figure: 1-filter body, 2-antimony and phosphorus removal part, 3-denitrification part, 4-water inlet pipe, 5-first filler, 501-first contact layer, 502-adsorption layer, 503-support layer, 6-water outlet pipe, 7-water distribution pipe, 8-second filler, 801-second contact layer, 802-filter material layer, 803-support layer, 9-drainage pipe, 10-drainage channel, 11-backwash irrigation channel, 12-backwash pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1 In an embodiment of the present invention, a multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant includes a filter tank body 1, in which an antimony and phosphorus removal part 2 and a denitrification part 3 are provided.

[0025] The antimony and phosphorus removal section 2 includes a first filter tank and a first filler 5 disposed in the first filter tank. The first filler 5 includes, from top to bottom, a first contact layer 501, an adsorption layer 502, and a support layer 503. The first contact layer 501 uses fine quartz sand with a particle size of 2-4 mm and a height H ≤ 0.2 m. The adsorption layer uses pyrite sand with a particle size of 0.075-2 mm and a height H ≤ 2 m. The support layer 503 uses gravel or pebbles with a particle size of 8 mm-12 mm and a height H ≤ 0.2 m. An inlet pipe 4 is provided at the upper end of the filler 5, and an outlet pipe 6 is provided at the lower portion of the filler 5.

[0026] The denitrification section 3 includes a second filter tank and a second filler 8 arranged in the second filter tank. The second filler 8 includes a second contact layer 801, a filter material layer 802, and a supporting layer 803 from top to bottom. The second contact layer uses coarse quartz sand with a particle size of 5-8 mm. The height of the second contact layer H≤0.2 m. The filter material layer 802 uses a mixture of pyrite and limestone with a particle size of 2-5 mm and a ratio of 4:1. The height H of the filter material layer 802 is 1.5 m-2.5 m. The supporting layer 803 uses gravel or pebbles with a particle size of 5-30 mm. They are arranged in layers and grades. The height of each layer is 0.07 m-0.1 m, and the total height is 0.35 m-0.5 m. A water distribution pipe 7 connected to the outlet pipe 6 is provided on the upper part of the second filler 8, and a drainage channel 10 is provided at the lower part of the second filler 8.

[0027] A buffer tank is located between the antimony and phosphorus removal section 2 and the denitrification section 3. An outlet pipe 6 is connected to the bottom of the buffer tank, and a water distribution pipe 7 is connected to the top of the buffer tank. The height of the water distribution pipe 7 is lower than that of the water inlet pipe 4. A drainage pipe 9 is located below the second filler 8 and is connected to a drainage channel 10. A backwash pipe 12 is located above the second filler 8 and is connected to a backwash irrigation channel 11. The backwash pipe 12 is located above the water distribution pipe 7.

[0028] When the present invention is in use, the secondary effluent from the printing and dyeing wastewater treatment plant first enters the antimony and phosphorus removal section 2 through the water inlet pipe 4. The wastewater enters from the top and passes through the fine quartz sand of the contact layer to reach the adsorption layer. Here, it fully contacts the pyrite sand, adsorbs the antimony in the water to the surface of the pyrite and fixes it. The Fe3+ or Fe(OH)3 produced in the pyrite matrix reacts with PO43 in the water to form FePO4, thereby achieving the simultaneous removal of phosphorus. Subsequently, the wastewater is fed into the water outlet pipe 6 through the pebbles or gravel of the bottom support layer and further into the water distribution area of the denitrification section 3. This area mainly controls the water quality and quantity of the denitrification zone to achieve uniform water distribution. In addition, a carbon source or alkali (if necessary) can be added here to achieve efficient combined heterotrophic / autotrophic denitrification treatment by controlling the carbon-nitrogen ratio.

[0029] Water from the distribution area enters the system through multiple points of inflow. In the denitrification filter, which uses pyrite as the primary substrate, the pyrite's sulfur and iron autotrophic denitrification process reduces NO₃-N in the water to N₂, thereby removing nitrogen. The treated water flows through bottom drainage pipes into the collection channel and then out to subsequent structures.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant, comprising a filter tank body (1), characterized in that: The filter tank body (1) is provided with an antimony and phosphorus removal part (2) and a nitrogen removal part (3); The antimony and phosphorus removal section (2) comprises a first filter tank and a first filler (5) disposed in the first filter tank, wherein an inlet pipe (4) is provided at the upper end of the filler (5), and an outlet pipe (6) is provided at the lower end of the filler (5); The denitrification section (3) comprises a second filter tank and a second filler (8) arranged in the second filter tank, a water distribution pipe (7) connected to the water outlet pipe (6) is arranged on the upper part of the second filler (8), and a drainage channel (10) is arranged on the lower part of the second filler (8).

2. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 1, characterized in that: The first filler (5) comprises, from top to bottom, a first contact layer (501), an adsorption layer (502), and a support layer (503).

3. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 2, characterized in that: The first contact layer (501) uses fine quartz sand with a particle size of 2-4 mm, and the height of the first contact layer (501) is H≤0.2 m. The adsorption layer uses pyrite sand with a particle size of 0.075-2 mm, and the height of the adsorption layer (502) is H≤2 m. The support layer (503) uses gravel or pebbles with a particle size of 8 mm-12 mm, and the height of the support layer (503) is H≤0.2 m.

4. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 1, characterized in that: A buffer tank is provided between the antimony and phosphorus removal section (2) and the denitrification section (3); the outlet pipe (6) is connected to the bottom of the buffer tank; the water distribution pipe (7) is connected to the upper part of the buffer tank; and the height of the water distribution pipe (7) is lower than the height of the water inlet pipe (4).

5. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 1, characterized in that: The second filler (8) comprises, from top to bottom, a second contact layer (801), a filter material layer (802), and a supporting layer (803).

6. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 5, characterized in that: The second contact layer uses coarse quartz sand with a particle size of 5-8 mm, and the height H of the second contact layer is less than or equal to 0.2 m. The filter material layer (802) uses a mixture of pyrite and limestone with a particle size of 2-5 mm and a ratio of 4:

1. The height H of the filter material layer (802) is 1.5 m to 2.5 m. The supporting layer (803) uses gravel or pebbles with a particle size of 5-30 mm, and is arranged in layers and grades. The height of each layer is 0.07 m to 0.1 m, and the total height is 0.35 m to 0.5 m.

7. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 1, characterized in that: A drainage pipe (9) is provided below the second filler (8), and the drainage pipe (9) is communicated with the drainage channel (10).

8. The multifunctional filter tank for deep treatment of printing and dyeing wastewater treatment plant according to claim 1, characterized in that: A backwash pipe (12) is provided above the second filler (8), the outer side of the backwash pipe (12) is connected to a backwash irrigation channel (11), and the backwash pipe (12) is located above the water distribution pipe (7).

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