A system for treating leather wastewater

Abstract

The utility model belongs to sewage treatment technical field especially relates to a kind of leather wastewater treatment system, including anaerobic device, the bottom of anaerobic device is connected with sewage source, the top of anaerobic device is provided with stripping tank, the stripping tank is used to separate the gas-liquid of anaerobic device, the gas outlet of stripping tank is connected with deodorization device, and the deodorization device is used to remove the odor in gas, and external circulation mechanism is also provided on the anaerobic device.The utility model removes the substance (sulfur-containing substance and protein) producing odor in wastewater, and the hydrogen sulfide and other gases with odor generated are concentrated by deodorization device, and not emitted into air, and no odor is generated in sewage plant range.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a leather wastewater treatment system. Background Technology

[0002] Leather wastewater is complex in composition and is characterized by "three highs": high concentration, high salinity, and high color. It also has a high content of recalcitrant organic matter, making it difficult to treat. Currently, leather wastewater treatment plants use the primitive "physicochemical method (chemical precipitation) + aerobic biological treatment process". This process is difficult to remove odors and poses a threat to the health of wastewater treatment plant operators and people in the surrounding area.

[0003] Therefore, a leather wastewater treatment system is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a leather wastewater treatment system to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides a leather wastewater treatment system, including an anaerobic device. The bottom of the anaerobic device is connected to a wastewater source, and a stripping tank is provided at the top of the anaerobic device. The stripping tank is used to separate the gas and liquid in the anaerobic device. The gas outlet of the stripping tank is connected to a deodorizing device, which is used to remove odors from the gas. The anaerobic device is also equipped with an external circulation mechanism.

[0006] Preferably, the anaerobic device includes a tank, with an anaerobic device inlet at the bottom of the tank, the inlet of which is connected to the outlet of an inlet pump, the inlet of which is connected to a sewage tank via a pipeline, and an anaerobic device outlet at the top of the tank, which is connected to an external water tank via a pipeline.

[0007] Preferably, the external circulation mechanism includes a circulation pump, the upper part of the tank is provided with an anaerobic device external circulation outlet, the anaerobic device external circulation outlet is connected to the water outlet of the circulation pump through a pipeline, the lower part of the tank is provided with an anaerobic device external circulation inlet, the anaerobic device external circulation inlet is connected to the water inlet of the circulation pump through a pipeline.

[0008] Preferably, the bottom of the stripping tank is provided with an anaerobic device reflux port, which is connected to the reflux pipe in the anaerobic device. Both sides of the stripping tank are provided with stripping tank inlets. The top of the tank is provided with two anaerobic device gas producing ports, which are correspondingly connected to the two stripping tank inlets. The top of the stripping tank is provided with a stripping tank outlet, which is connected to the deodorization device.

[0009] Preferably, the deodorization device is a desulfurization device. The lower part of the desulfurization device is provided with a desulfurization device inlet, which is connected to the outlet of the stripping tank through a pipe. The top of the desulfurization device is provided with a desulfurization device outlet. The lower part of the tank is provided with an anaerobic device stripping inlet, which is located above the anaerobic device water inlet. The desulfurization device outlet is connected to the anaerobic device stripping inlet through a gas pipe.

[0010] Preferably, a biogas blower is installed on the gas pipe.

[0011] Compared with the prior art, the present invention has the following advantages and technical effects:

[0012] This utility model provides a leather wastewater treatment system that completely removes odor-causing substances (sulfur-containing substances and proteins) from the wastewater through an anaerobic device. The generated hydrogen sulfide and other odorous gases are mixed in with biogas and centrally treated by the deodorization device, so they are not released into the air and do not produce odor within the wastewater treatment plant area. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a leather wastewater treatment system proposed in this utility model;

[0015] The components include: 1. Inlet pump; 2. Anaerobic digester; 2.1. Anaerobic digester inlet; 2.2. Anaerobic digester outlet; 2.3. Anaerobic digester reflux outlet; 2.4. Anaerobic digester gas stripping inlet; 2.5. Anaerobic digester external circulation outlet; 2.6. Anaerobic digester external circulation inlet; 2.7. Anaerobic digester gas production outlet; 3. Stripping tank; 3.1. Stripping tank inlet; 3.3. Stripping tank outlet; 4. Circulation pump; 5. Desulfurization unit; 5.1. Desulfurization unit inlet; 5.2. Desulfurization unit outlet; 6. Biogas blower. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Reference Figure 1 This utility model provides a leather wastewater treatment system, including an anaerobic device 2. The bottom of the anaerobic device 2 is connected to the sewage source, and a stripping tank 3 is provided at the top of the anaerobic device 2. The stripping tank 3 is used to separate the gas and liquid in the anaerobic device 2. The gas outlet of the stripping tank 3 is connected to a deodorizing device, which is used to remove odors from the gas. An external circulation mechanism is also provided on the anaerobic device 2.

[0019] This invention completely removes odor-causing substances (sulfur-containing substances and proteins) from wastewater through the anaerobic device 2. The generated hydrogen sulfide and other odorous gases are mixed in the biogas and centrally treated by the deodorization device, without being released into the air, and no odor is generated within the sewage treatment plant area.

[0020] Furthermore, the anaerobic device 2 includes a tank, with an anaerobic device inlet 2.1 at the bottom of the tank. The anaerobic device inlet 2.1 is connected to the outlet of the inlet pump 1. The inlet of the inlet pump 1 is connected to the sewage tank through a pipeline. The anaerobic device outlet 2.2 is provided at the top of the tank and is connected to an external water tank through a pipeline.

[0021] Furthermore, the external circulation mechanism includes a circulation pump 4, an anaerobic device external circulation outlet 2.5 is provided at the upper part of the tank, the anaerobic device external circulation outlet 2.5 is connected to the outlet end of the circulation pump 4 through a pipeline, and an anaerobic device external circulation inlet 2.6 is provided at the lower part of the tank, the anaerobic device external circulation inlet 2.6 is connected to the inlet end of the circulation pump 4 through a pipeline.

[0022] The circulating pump 4 drives the wastewater to be drawn from the external circulation inlet 2.6 of the anaerobic device at the bottom of the tank to the external circulation outlet 2.5 of the anaerobic device at the top, forming a forced circulation. This significantly increases the hydraulic upflow velocity in the reactor, eliminates dead zones, ensures full contact between the wastewater and microorganisms, improves mass transfer efficiency, and promotes the degradation of organic matter.

[0023] Furthermore, the bottom of the stripping tank 3 is provided with an anaerobic device reflux port 2.3, which is connected to the reflux pipe in the anaerobic device 2. Both sides of the stripping tank 3 are provided with stripping tank inlets 3.1, and the top of the tank is provided with two anaerobic device gas producing ports 2.7, which are corresponding to and connected to the two stripping tank inlets 3.1. The top of the stripping tank 3 is provided with a stripping tank outlet 3.3, which is connected to the deodorization device.

[0024] Furthermore, the deodorization device is a desulfurization device 5. The lower part of the desulfurization device 5 is provided with a desulfurization device inlet 5.1, which is connected to the outlet 3.3 of the stripping tank through a pipe. The top of the desulfurization device 5 is provided with a desulfurization device outlet 5.2. The lower part of the tank is provided with an anaerobic device gas stripping inlet 2.4, which is located above the anaerobic device water inlet 2.1. The desulfurization device outlet 5.2 is connected to the anaerobic device gas stripping inlet 2.4 through a gas pipe. Furthermore, a biogas blower 6 is provided on the gas pipe.

[0025] After gas-liquid separation, the biogas escapes from the stripping tank outlet 3.3 and enters the desulfurization unit inlet 5.1 of the desulfurization unit 5 for biogas desulfurization. The desulfurized biogas exits from the desulfurization unit outlet 5.2, is pressurized by the biogas blower 6, and then flows back to the anaerobic unit gas stripping inlet 2.4 to enter the anaerobic unit 2. The biogas is dispersed through the biogas stripping perforated pipe in the anaerobic unit 2 to strip off the volatile toxic substance hydrogen sulfide produced during the anaerobic reaction, thereby improving the stability and efficiency of the anaerobic system.

[0026] The leather wastewater treatment system provided by this utility model works as follows: Leather wastewater in the sewage tank is pumped to the anaerobic device 2 by the inlet lift pump 1 and mixed with high concentrations of anaerobic microorganisms. The wastewater is degraded to produce biogas, hydrogen sulfide, and sludge, which are then initially separated by a three-phase separator inside the anaerobic device 2. During the ascent, carbon dioxide and methane in the biogas can carry volatile toxic substances (such as hydrogen sulfide and some volatile fatty acids) from the liquid phase into the gas phase through the "stripping effect". During the ascent, the biogas forms a bubble aggregate, which generates strong buoyancy and drives the sludge and wastewater to the top of the anaerobic device 2 and through the stripping tank inlet 3. 1. The sludge and wastewater enter the stripping tank 3 for efficient gas-liquid separation. Due to the density difference, the sludge and wastewater flow back to the bottom of the anaerobic device 2 along the return pipe. The biogas separated during the gas-liquid separation process enters the desulfurization device 5 for desulfurization. The hydrogen sulfide (H2S) is adsorbed by iron oxide material. The hydrogen sulfide is converted into sulfate by alkaline solution (such as NaOH) or oxidant (such as FeCl3). Then, the biogas blower 6 pressurizes and flows back to the anaerobic device 2. The physical properties (such as buoyancy and stirring) and chemical properties (such as stripping of toxic substances) of biogas are used to improve the stability and efficiency of the anaerobic device 2. After treatment, the wastewater is discharged through the anaerobic device outlet 2.2.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A leather wastewater treatment system, characterized in that, The device includes an anaerobic apparatus (2), the bottom of which is connected to a wastewater source. A stripping tank (3) is installed at the top of the anaerobic apparatus (2). The stripping tank (3) is used to separate the gas and liquid in the anaerobic apparatus (2). A deodorizing device is connected to the gas outlet of the stripping tank (3). The deodorizing device is used to remove odors from the gas. An external circulation mechanism is also provided on the anaerobic apparatus (2).

2. The leather wastewater treatment system according to claim 1, characterized in that, The anaerobic device (2) includes a tank body, with an anaerobic device inlet (2.1) at the bottom of the tank body. The anaerobic device inlet (2.1) is connected to the outlet of a water inlet pump (1). The inlet of the water inlet pump (1) is connected to a sewage tank through a pipeline. The anaerobic device outlet (2.2) is provided at the top of the tank body. The anaerobic device outlet (2.2) is connected to an external water tank through a pipeline.

3. The leather wastewater treatment system according to claim 2, characterized in that, The external circulation mechanism includes a circulation pump (4), and the upper part of the tank is provided with an anaerobic device external circulation outlet (2.5). The anaerobic device external circulation outlet (2.5) is connected to the water outlet of the circulation pump (4) through a pipeline. The lower part of the tank is provided with an anaerobic device external circulation inlet (2.6), and the anaerobic device external circulation inlet (2.6) is connected to the water inlet of the circulation pump (4) through a pipeline.

4. The leather wastewater treatment system according to claim 2, characterized in that, The bottom of the stripping tank (3) is provided with an anaerobic device reflux port (2.3), which is connected to the reflux pipe in the anaerobic device (2). The two sides of the stripping tank (3) are provided with stripping tank inlets (3.1). The top of the tank is provided with two anaerobic device gas production ports (2.7), which are corresponding to and connected to the two stripping tank inlets (3.1). The top of the stripping tank (3) is provided with a stripping tank outlet (3.3), which is connected to the deodorization device.

5. The leather wastewater treatment system according to claim 4, characterized in that, The deodorization device is a desulfurization device (5). The desulfurization device (5) has a desulfurization device inlet (5.1) at its lower part. The desulfurization device inlet (5.1) is connected to the outlet (3.3) of the stripping tank through a pipe. The desulfurization device (5) has a desulfurization device outlet (5.2) at its top. The tank has an anaerobic device gas stripping inlet (2.4) at its lower part. The anaerobic device gas stripping inlet (2.4) is located above the anaerobic device water inlet (2.1). The desulfurization device outlet (5.2) is connected to the anaerobic device gas stripping inlet (2.4) through a gas pipe.

6. The leather wastewater treatment system according to claim 5, characterized in that, A biogas blower (6) is installed on the gas pipe.

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