Sludge bucket gas-water combined enhanced sludge discharge device

Abstract

The utility model provides a gas-water combined enhanced sludge discharge device of a sludge bucket, and relates to the technical field of sewage treatment. A sludge bucket air-water combined reinforced sludge discharge device comprises a sludge bucket, the sludge bucket is longitudinally divided into a sewage area and a sludge area, the sludge area is provided with a water inlet pipe and an air inlet pipe, and the water inlet pipe and the air inlet pipe are both wound on the inner wall of the sludge area. The device mainly adopts an air-water combined flushing mode, so that the sludge discharging function of the sludge hopper is enhanced, and the'side wall effect 'of sludge is eliminated. The sludge hopper at the lower part of the grit chamber or the sedimentation tank scatters the sludge tightly attached to the wall of the sludge hopper under the high-speed washing of compressed air and water flow with pressure, so that one part of the attached sludge flows back into the water collecting well at the front end of the sewage plant through ascending water flow to be treated again, and the other part of the attached sludge settles at the bottom of the sludge hopper again and then is treated.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sludge-gas-water combined enhanced sludge discharge device. Background Art

[0002] As a key treatment unit in domestic sewage treatment plants and industrial wastewater treatment plants, sedimentation tanks use the density difference between suspended matter and wastewater after collision and aggregation to allow suspended matter in sewage to naturally settle in the sludge hopper under the action of gravity, thereby ensuring the solid-liquid separation of sewage and sludge. In the sewage treatment process, grit chambers, primary sedimentation tanks and secondary sedimentation tanks generally use gravity sedimentation. The settled sludge is uniformly collected in the sludge hopper and discharged regularly, while the clean water after solid-liquid separation is discharged through the triangular weir overflow. Grit chambers and primary sedimentation tanks mainly separate inorganic particles with higher density and are generally located at the pretreatment end of the sewage treatment plant. The solid-liquid separation effect of grit chambers and primary sedimentation tanks has a great influence on reducing the wear of water pumps and pipes and reducing the water inlet load of subsequent treatment units. In addition, in the activated sludge process, the secondary sedimentation tank and the biological aeration tank are an integral unit. The biological aeration tank is used for biodegradation. The secondary sedimentation tank separates the treated water from the microorganisms and then discharges it. The effluent from the secondary sedimentation tank contains a certain amount of suspended solids, mainly organisms suspended in the water. The concentration of suspended solids in the effluent directly affects the content of various pollutants in the effluent. For every 1 mg / L increase in suspended solids in the effluent, the content of various pollutants will increase. BOD5: 0.3-1.0 mg / L; CODcr: 0.8-1.4 mg / L; TN: 0.08-0.1 mg / L; TP: 0.02-0.04 mg / L. The sludge hopper is an important part of the grit tank, the first sedimentation tank, and the second sedimentation tank. It mainly collects the settled sludge and discharges it regularly.

[0003] Since the sludge has a certain viscosity, if the sludge is not discharged in time, the sludge will be tightly attached to the side wall of the sludge hopper, forming a "side wall effect", and the sludge will be difficult to discharge smoothly. At the same time, since the secondary sedimentation tank is mainly used for solid-liquid separation of activated sludge, a certain amount of activated sludge is often accumulated in the sludge hopper, and its organic matter content is high. Long-term accumulation in the sludge hopper is prone to denitrification. The generated nitrogen will disperse the settled sludge in the sludge hopper, reduce the sludge density, and eventually cause the sludge to float and affect the effluent water quality. Utility Model Content

[0004] The purpose of the utility model is to provide a sludge-gas-water combined enhanced sludge discharge device. The specific contents are as follows:

[0005] The utility model provides a sludge bucket air-water combined enhanced sludge discharge device, comprising a sludge bucket, which is longitudinally divided into a sewage area and a sludge area. The sludge area is provided with a water inlet pipe and an air inlet pipe, and the water inlet pipe and the air inlet pipe are both arranged around the inner wall of the sludge area.

[0006] Furthermore, the water inlet pipe is arranged along the inner wall of the sludge area for at least one circle.

[0007] Furthermore, the air inlet pipe is arranged along the inner wall of the sludge area for at least one circle.

[0008] Furthermore, the gas of the air inlet pipe includes line one, which comes from the blower room; the water of the water inlet pipe includes line two, which comes from the clear water tank of the sewage treatment plant.

[0009] Furthermore, the water inlet pipe is arranged above the air inlet pipe.

[0010] Furthermore, the pipe body of the water inlet pipe and the pipe body of the air inlet pipe are both provided with a plurality of through holes.

[0011] Furthermore, a liquid inlet pipe is provided on the sewage area side, and a mud-water mixture is passed through the liquid inlet pipe; an overflow area is provided near the top of the sewage area, and a liquid outlet pipe is connected to the overflow area.

[0012] Furthermore, the liquid inlet pipe and the liquid outlet pipe are arranged opposite to each other.

[0013] Furthermore, a sludge discharge pipe is provided at the bottom of the sludge hopper.

[0014] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0015] In the sludge hopper of the traditional grit chamber and sedimentation tank, water inlet pipes and air inlet pipes are added. The perforations (i.e. perforated pipes) arranged in the pipe body are utilized, and two circles of closed perforated pipes are laid along the inner wall of the sludge hopper respectively. The water-flushing perforated pipes are arranged higher than the air-flushing perforated pipes. A number of microholes are arranged at regular intervals along the two sets of perforated flushing pipes to ensure that air and clean water can efficiently flush the sludge attached to the inner wall of the sludge hopper. The compressed air for flushing is mainly provided by the blower room of the sewage treatment plant, and the flushing water is mainly pumped in by the lifting pump of the clean water tank at the tail end of the sewage treatment plant.

[0016] This device mainly adopts the air-water combined flushing method to strengthen the sludge discharge function of the sludge hopper and eliminate the "side wall effect" of the sludge. The sludge hopper at the bottom of the grit chamber or sedimentation tank is flushed by compressed air and pressurized water at high speed to break up the sludge tightly attached to the sludge hopper wall, so that part of the attached sludge is returned to the front water collection well of the sewage plant through the rising water flow for further treatment, and the other part of the attached sludge is re-settled at the bottom of the sludge hopper for sludge discharge treatment, ensuring that the sludge in the grit chamber or sedimentation tank is discharged completely, and avoiding the "denitrification" of the settled sludge due to long-term accumulation, which causes the sludge to float and affect the effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a sludge bucket gas-water combined enhanced sludge discharge device provided in an embodiment of the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of area A in the middle.

[0020] Icon: 100-sludge hopper, 110-sewage area, 111-liquid inlet pipe, 120-sludge area, 121-water inlet pipe, 122-air inlet pipe, 123-sludge discharge pipe, 130-overflow area, 131-liquid outlet pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 a limitation on the present invention.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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.

[0026] Example 1

[0027] The present embodiment provides a sludge hopper gas-water combined enhanced sludge discharge device, comprising a sludge hopper 100, which is longitudinally divided into a sewage area 110 and a sludge area 120, and the sludge area 120 is provided with a water inlet pipe 121 and an air inlet pipe 122, which are both arranged around the inner wall of the sludge area 120. The water inlet pipe 121 and the air inlet pipe 122 are both provided with valves.

[0028] In this embodiment, the water inlet pipe 121 is arranged along the inner wall of the sludge area 120 for at least one circle.

[0029] In this embodiment, the air inlet pipe 122 is arranged along the inner wall of the sludge area 120 for at least one circle.

[0030] In this embodiment, the gas of the air inlet pipe 122 includes line 1, which comes from the blower room; the water of the water inlet pipe 121 includes line 2, which comes from the clear water tank of the sewage treatment plant.

[0031] In this embodiment, the water inlet pipe 121 is disposed above the air inlet pipe 122 .

[0032] In this embodiment, the tube body of the water inlet pipe 121 and the tube body of the air inlet pipe 122 are both provided with a plurality of through holes.

[0033] In this embodiment, a liquid inlet pipe 111 is provided on the sewage area 110 side, and a mud-water mixture is passed through the liquid inlet pipe 111; an overflow area 130 is provided near the top of the sewage area 110, and the overflow area 130 is connected to a liquid outlet pipe 131, and the liquid outlet pipe 131 is provided with a valve.

[0034] In this embodiment, the liquid inlet pipe 111 and the liquid outlet pipe 131 are arranged opposite to each other.

[0035] In this embodiment, a mud discharge pipe 123 is provided at the bottom of the mud hopper 100, and the mud discharge pipe 123 is provided with a valve.

[0036] The workflow of this utility model:

[0037] After the mud-water mixture flows into the sludge hopper 100 through the liquid inlet pipe 111, the raw water is separated from the mud in the clarification area of ​​the sludge hopper 100. The separated clean water rises to the clean water area and then overflows through the triangular weir to be discharged to the next treatment unit; the separated large-size gravel and sludge slowly settle in the sludge hopper 100 under the action of gravity, and slide along the hopper wall to the bottom of the hopper. After the settled sludge is initially concentrated, the sludge discharge process is selected according to the sludge amount: the sludge discharge valve is opened to allow most of the settled sludge to pass through the sludge discharge valve. It is discharged by gravity to the next sludge treatment unit. After most of the settled sludge is discharged, the sludge discharge valve is closed, and the flushing valve of the air inlet pipe 122 and the flushing valve of the water inlet pipe 121 are opened to discharge compressed air and pressurized clean water from the perforated pipe in the sludge hopper 100 at high speed, effectively flushing the sludge attached to the inner wall, and the cleaning waste gas is discharged from the water surface. The cleaning waste water is returned and collected in the water collection tank at the front end of the sewage treatment plant for re-circulation treatment. After the air and water flushing is completed, the sludge discharge valve is opened again to discharge the settled sludge attached to the wall of the sludge hopper.

[0038] Main parameters of air-water combined enhanced sludge removal:

[0039] Air flushing intensity: q1 = 12 ~ 18L / (m 2 s);

[0040] Clean water flushing intensity: q2 = 2.5 ~ 3.5L / (m 2 s);

[0041] Flushing water flow rate at the inlet: v1≤1.5m / s;

[0042] Flushing air velocity at the inlet: v2≤5m / s;

[0043] Air flushing time: t1 = 3 ~ 5min;

[0044] Clean water flushing time: t2 = 4 ~ 6min;

[0045] The height spacing between the air perforated pipe and the clean water perforated pipe is: d = 300 ~ 500mm;

[0046] Perforation inner diameter: Φ = 20 ~ 30mm;

[0047] Through-hole flow rate: v3 = 2.0 ~ 3.0 m / s;

[0048] In this embodiment, the requirements for adding the air inlet pipe 121 and the water inlet pipe 122 are as follows: the number of additional circles can be selected according to the height of the sludge hopper, and the water-flushing perforated pipes and the air-flushing perforated pipes are required to be arranged at intervals.

[0049] Air-water flushing cycle: flush immediately after sludge discharge or select the flushing frequency based on actual conditions.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sludge bucket gas water combined enhanced sludge discharge device, characterized in that: The utility model comprises a sludge hopper which is longitudinally divided into a sewage area and a sludge area. The sludge area is provided with a water inlet pipe and an air inlet pipe which are both arranged around the inner wall of the sludge area.

2. The sludge bucket gas water combined enhanced sludge discharge device according to claim 1 is characterized in that: The water inlet pipe is arranged along the inner wall of the sludge area for at least one circle.

3. The sludge bucket gas and water combined enhanced sludge discharge device according to claim 1 is characterized in that: The air inlet pipe is arranged along the inner wall of the sludge area for at least one circle.

4. The sludge bucket gas water combined enhanced sludge discharge device according to claim 1 is characterized in that: The gas of the air inlet pipe includes line one, which comes from the blower room; the water of the water inlet pipe includes line two, which comes from the clear water tank of the sewage treatment plant.

5. The sludge bucket gas water combined enhanced sludge discharge device according to claim 1 is characterized in that: The water inlet pipe is arranged above the air inlet pipe.

6. The sludge bucket gas and water combined enhanced sludge discharge device according to any one of claims 1 to 5, characterized in that: The pipe body of the water inlet pipe and the pipe body of the air inlet pipe are both provided with a plurality of perforations.

7. The sludge bucket gas and water combined enhanced sludge discharge device according to claim 1 is characterized in that: A liquid inlet pipe is arranged on the sewage area side, and a mud-water mixture is passed through the liquid inlet pipe; an overflow area is arranged near the top of the sewage area, and a liquid outlet pipe is connected to the overflow area.

8. The sludge bucket gas and water combined enhanced sludge discharge device according to claim 7 is characterized in that: The liquid inlet pipe and the liquid outlet pipe are arranged opposite to each other.

9. The sludge bucket gas water combined enhanced sludge discharge device according to claim 1, characterized in that: A sludge discharge pipe is provided at the bottom of the sludge hopper.

Images