Device for treating leather industry wastewater by using aerobic granular sludge

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a device for treating wastewater in leather industry by using aerobic granular sludge, which comprises a micro-aerobic tank and an aerobic aeration tank, the micro-aerobic tank is communicated with the aerobic aeration tank, a solid-liquid separation device is arranged in the aerobic aeration tank, a drain pipe is connected onto the solid-liquid separation device, and the drain pipe is communicated with the aerobic granular sludge. A water distribution area is arranged at one end, far away from the aerobic aeration tank, of the micro-aerobic tank and is connected with a water inlet pipe; the bottom of the solid-liquid separation device is connected with a sludge return pipe, one end, far away from the solid-liquid separation device, of the sludge return pipe is connected with the micro-aerobic tank, the sludge return pipe is connected with a sludge return branch pipe, and the sludge return branch pipe is connected with a sludge recovery tank. According to the internal circulation of the solid-liquid separation device, aerobic granular sludge can be cultured, the content of microorganisms is increased, the wastewater is treated more efficiently, and meanwhile, the device has excellent settling performance, can effectively remove pollutants such as organic matters, nitrogen, phosphorus and the like in the leather wastewater, and reduces pollution to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating wastewater in the leather industry by utilizing aerobic granular sludge. Background Art

[0002] At present, there are many chemicals used in the leather production process. The wastewater contains a large number of difficult-to-biodegrade organic nitrogen compounds and phosphorus-containing compounds. The water quality and quantity fluctuate greatly, the biodegradability is poor, there are many suspended solids, it is easy to corrupt, and the amount of pollution is large. Our company relies on ABR anaerobic + oxidation ditch for treatment to remove organic pollutants. At present, it mainly relies on ABR anaerobic + oxidation ditch aerobic removal, but the energy consumption is high, and the operation effect of ABR has a greater impact on the oxidation ditch. In order to further improve the removal rate of pollutants, it is necessary to modify the oxidation ditch and further treat the pollutants to reduce the adverse impact on the environment.

[0003] The technical problems to be solved are as follows: 1. How to further improve the removal rate of COD, total nitrogen and total phosphorus in the aerobic biochemical section through the implementation of this project; 2. How to reduce energy consumption and reduce operating costs through this project; 3. How to improve the stability of AGS aerobic granular sludge under continuous flow conditions to ensure long-term stable operation and reduce maintenance costs.

[0004] Therefore, those skilled in the art urgently need to develop a device for treating leather industry wastewater using aerobic granular sludge. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a device for treating wastewater from the leather industry by utilizing aerobic granular sludge.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for treating wastewater from the leather industry using aerobic granular sludge, comprising a micro-aerobic tank and an aerobic aeration tank, the micro-aerobic tank and the aerobic aeration tank being connected to each other, a solid-liquid separation device being arranged in the aerobic aeration tank, a drain pipe being connected to the solid-liquid separation device, a water distribution area being arranged at one end of the micro-aerobic tank away from the aerobic aeration tank, and a water inlet pipe being connected to the water distribution area; a sludge return pipe being connected to the bottom of the solid-liquid separation device, and an end of the sludge return pipe being away from the solid-liquid separation device being connected to the micro-aerobic tank.

[0007] Preferably, a drug adding pipe is provided on the inner wall of the solid-liquid separation device, and a baffle is provided on the top of the solid-liquid separation device.

[0008] Preferably, the sludge return pipe is connected to a sludge return branch pipe, and the sludge return branch pipe is connected to a sludge recovery tank.

[0009] Preferably, a sludge return pump is provided on the sludge return pipe.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model is modified on the basis of the original process. Through the internal circulation of the solid-liquid separation device, aerobic granular sludge can be cultivated to increase the content of microorganisms, which can treat wastewater more efficiently. At the same time, it also has excellent sedimentation performance, which can separate mud and water faster, and make AGS stable for a long time, and the particle size and proportion remain unchanged. The sludge concentration in the reactor and the stability of the process are maintained during operation. It can effectively remove organic matter, nitrogen, phosphorus and other pollutants in leather wastewater, reduce pollution to the environment, meet national emission standards, realize the industrial application of AGS technology, promote the green development of the leather industry, explore advanced experience and technology, and have a great impact on the future treatment and comprehensive utilization of the three wastes in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the solid-liquid separation device of the utility model.

[0014] In the figure: 1- micro-aerobic tank; 2- aerobic aeration tank; 3- water distribution area; 4- solid-liquid separation device; 41- dosing pipe; 42- baffle; 5- sludge recovery tank; 6- water inlet pipe; 7- drainage pipe; 8- sludge return pipe; 9- sludge return branch pipe. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0016] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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 the present invention can be understood according to specific circumstances.

[0018] See also Figure 1-Figure 2 The utility model provides an embodiment: a device for treating wastewater from the leather industry using aerobic granular sludge, comprising a microaerobic tank 1 and an aerobic aeration tank 2, the microaerobic tank 1 and the aerobic aeration tank 2 are interconnected, a sedimentation separation zone is provided in the aerobic aeration tank 2, namely a solid-liquid separation device 4, a drain pipe 7 is connected to the solid-liquid separation device 4, a water distribution zone 3 is provided at one end of the microaerobic tank 1 away from the aerobic aeration tank 2, and a water inlet pipe 6 is connected to the water distribution zone 3; a sludge return pipe 8 is connected to the bottom of the solid-liquid separation device 4, an end of the sludge return pipe 8 away from the solid-liquid separation device 4 is connected to the microaerobic tank 1, and a sludge return pump is provided on the sludge return pipe 8.

[0019] Aeration is performed through the micro-aerobic pool 1, and a fan is provided on the side of the micro-aerobic pool 1. The air volume of the fan is controlled to control the dissolved oxygen concentration of the micro-aerobic pool 1, so that the dissolved oxygen in the micro-aerobic pool 1 is about 0.5 mg / L; the dissolved oxygen concentration of the aerobic aeration pool 2 is controlled at 1.0-2.0 mg / L. The dissolved oxygen concentration of the aerobic aeration pool 2 is relatively high, which is conducive to the further growth of aerobic microorganisms and the decomposition of organic matter. The biological metabolic function of microorganisms is used to decompose organic matter in the wastewater into simple inorganic matter, thereby reducing COD.

[0020] In the micro-aerobic zone, due to the low DO concentration, the growth of denitrifying bacteria can be promoted, and the reduction of nitrate and nitrite can be achieved, that is, the denitrification process. At the same time, the high DO level in the aerobic zone is conducive to the growth of nitrifying bacteria and the oxidation of ammonia nitrogen, that is, the nitrification process, thereby achieving simultaneous nitrification and denitrification.

[0021] Furthermore, a dosing pipe 41 is provided on the inner wall of the solid-liquid separation device 4, a baffle 42 is provided on the top of the solid-liquid separation device 4, a sludge return branch pipe 9 is connected to the sludge return pipe 8, and the sludge return branch pipe 9 is connected to the sludge recovery tank 5. The power generated by the aeration and water inflow of the dosing pipe 41 causes the mixed liquid to rise and collide with the baffle 42, and then the liquid disperses and flows downward to form a stable internal circulation.

[0022] This cycle promotes the granulation of AGS aerobic granular sludge, which is divided into three stages: the first stage is the aggregation of microorganisms to form small aggregates; the second stage is the development of aggregates into dense mature AGS aerobic granular sludge; the third stage is the disintegration of overgrown AGS aerobic granular sludge, and the fragments participate in granulation again.

[0023] In order to recycle the AGS aerobic granular sludge, the sludge particles settle to the bottom of the solid-liquid separation device 4 under the action of gravity. A sludge return pipe 8 is set at the bottom of the solid-liquid separation device 4 for returning the sludge to the micro-aerobic tank 1. Since the sludge in the aerobic aeration tank 2 itself is refluxed for circulation and continuously carried out in the solid-liquid separation device 4, the sludge granulation is a dynamic process. This dynamic process makes the AGS stable for a long time, and the particle size and proportion remain unchanged. The sludge concentration in the reactor and the stability of the process are maintained during operation. The remaining sludge is discharged to the sludge recovery tank 5, and the supernatant is discharged from the drain pipe 7.

[0024] This process can cultivate aerobic granular sludge, increase the content of microorganisms, and treat wastewater more efficiently. It also has excellent sedimentation performance, faster mud-water separation, and can simultaneously remove carbon, nitrogen and phosphorus from wastewater, reducing treatment steps and costs.

[0025] The working principle of the utility model is as follows: the water after anaerobic treatment enters the water distribution area 3 of the micro-aerobic pool 1 through the water inlet pipe 6 for aeration, and then flows into the micro-aerobic pool 1 and the aerobic aeration pool 2 in sequence. In the micro-aerobic pool 1, due to the low DO concentration, the growth of denitrifying bacteria can be promoted to achieve the reduction of nitrate and nitrite, that is, the denitrification process. At the same time, the high DO level of the aerobic aeration pool 2 is conducive to the growth of nitrifying bacteria and the oxidation of ammonia nitrogen, that is, the nitrification process, thereby achieving simultaneous nitrification, denitrification and denitrification; the dissolved oxygen concentration in the aerobic aeration pool 2 is relatively high, which is conducive to the further growth of aerobic microorganisms and the decomposition of organic matter. The biological metabolic function of microorganisms is used to decompose organic matter in the wastewater into simple inorganic matter, thereby reducing COD; at the same time, through the sedimentation performance of aerobic granular sludge, carbon, nitrogen and phosphorus in the wastewater are removed synchronously, reducing the processing steps and costs. The aerobic granular sludge is used to return the sludge to the micro-aerobic pool 1 through the sludge return pipe 8, thereby maintaining the recovery of the AGS aerobic granular sludge.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for treating leather industry wastewater using aerobic granular sludge, characterized in that: The invention comprises a micro-aerobic tank (1) and an aerobic aeration tank (2), wherein the micro-aerobic tank (1) and the aerobic aeration tank (2) are interconnected, a solid-liquid separation device (4) is provided in the aerobic aeration tank (2), a drainage pipe (7) is connected to the solid-liquid separation device (4), a water distribution area (3) is provided at one end of the micro-aerobic tank (1) away from the aerobic aeration tank (2), and the water distribution area (3) is connected to a water inlet pipe (6); a sludge return pipe (8) is connected to the bottom of the solid-liquid separation device (4), and the end of the sludge return pipe (8) away from the solid-liquid separation device (4) is connected to the micro-aerobic tank (1).

2. The device for treating leather industry wastewater using aerobic granular sludge according to claim 1, characterized in that: A drug adding pipe (41) is provided on the inner wall of the solid-liquid separation device (4), and a baffle (42) is provided on the top of the solid-liquid separation device (4).

3. The device for treating leather industry wastewater using aerobic granular sludge according to claim 1, characterized in that: The sludge return pipe (8) is connected to a sludge return branch pipe (9), and the sludge return branch pipe (9) is connected to a sludge recovery tank (5).

4. The device for treating leather industry wastewater using aerobic granular sludge according to claim 1, characterized in that: The sludge return pipe (8) is provided with a sludge return pump.

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