Excess sludge unpowered lifting and discharging application system for sewage treatment plant

Abstract

The utility model discloses an excess sludge unpowered lifting and discharging application system for a sewage treatment plant, which comprises a sludge high-position well, a sludge distribution well and a sludge thickening tank, and the sludge high-position well is communicated with the sludge distribution well through a lifting pump and a sludge discharging pipe. The sludge distribution well is communicated with the sludge thickening tank through a thickening tank feeding pipe, and a fluid energy accumulator is arranged on the sludge high-level well; an upper suction pipe, a feeding hose, an exhaust pipe and a discharging pipe are arranged on the fluid energy accumulator; the upper suction pipe is communicated with the sludge high-position well; the feeding hose is communicated with the sludge discharge pipe; and the discharge pipe is communicated with the sludge distribution well. According to the utility model, the energy dependence and consumption can be reduced, and the power consumption energy, namely the maintenance and operation cost, of a sewage treatment plant is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sludge fluid transmission technology of town sewage treatment plant more specifically, relate to a kind of for residual sludge unpowered lifting discharge application system of sewage treatment plant. BACKGROUND

[0002] The activated sludge generated by the sewage treatment plant is composed of microbial flocculation bodies, which contain bacteria, protozoa, metazoan and other microorganisms. The flocculation bodies aggregate with each other to form a complex network structure. When subjected to shear force, the network structure will deform. When the shear force is small, the interaction between the flocculation bodies can maintain the relative integrity of the structure, and the fluid shows high viscosity. With the increase of shear force, the flocculation body network structure is destroyed, the viscosity of the fluid is reduced, and the fluidity is improved. Unlike the one-dimensional water medium, it belongs to a typical non-Newtonian fluid. The existing sewage treatment plant mainly has the following two ways to guide the flow of activated sludge.

[0003] The first way is to make destructive side holes in the wall of the limited space where the activated sludge is stored for one-way flow of activated sludge.

[0004] The second way is to install a sludge lifting pump in the activated sludge storage tank, and to transfer the activated sludge to the next treatment structure or container for further treatment by means of electric drag.

[0005] The defects of the above-mentioned first way are mainly as follows:

[0006] 1) The sewage treatment plant is an important guarantee structure of municipal infrastructure, which ensures the normal operation of sewage treatment and is an important guarantee building for the safe operation of the city. If destructive holes are made, it not only deviates from the original design intention, but also damages the structure of the structure, reduces the strength of the structure, and damages the stability of the structure.

[0007] 2) After the sludge pool structure is opened, the leakage risk of waterproof performance increases, and the corrosion intensifies.

[0008] 3) The form of sludge fluid changes, the flow cannot be controlled, and the fluid process control is disorderly.

[0009] 4) If the sludge pool structure is destructively opened for flow, the maintenance cost increases, the service life shortens, and even the bearing capacity and overall stability of the entire structure need to be reevaluated.

[0010] The defects of the above-mentioned second way are mainly as follows:

[0011] 1) When activated sludge is transported by sludge lifting pump, there is a certain damage to the activated microorganisms. The activated sludge produced by the sewage treatment system needs to be returned to the front end of the process through the backflow measure to maintain the total number of activated sludge flora in the system to maintain the benign environment of sewage treatment. However, the activated sludge is a complex structure composed of microbial flocs, which contains a large number of bacteria, protozoa and metazoan microorganisms. During the operation of the sludge lifting pump, especially when the pump with high-speed rotating impeller such as centrifugal pump is used, the shear force of the impeller will cause damage to the microorganisms. These microorganisms are sensitive to environmental conditions, and strong mechanical shear may damage the cell structure of the microorganisms, leading to a decrease in the activity of the microorganisms, even death, which has an adverse impact on sewage treatment;

[0012] 2) The transmission of activated sludge by the lifting pump is easy to cause the destruction of the floc structure. The microbial flocs in the activated sludge are adhered to each other by extracellular polymeric substances (EPS), forming a relatively stable structure. The operation of the sludge lifting pump may destroy this floc structure. When the floc is destroyed, the settling performance of the sludge will be affected, which may cause problems such as sludge bulking. For example, during the sludge transportation process, if the floc is dispersed, the sludge that can settle quickly may become difficult to settle, increasing the difficulty of subsequent treatment;

[0013] 3) The problems that are prone to occur during the operation and maintenance of the sludge lifting pump are as follows:

[0014] 3.1) Blockage problem: The activated sludge contains various solid particles, fibrous materials and microbial metabolites. These substances are easy to cause blockage at the inlet, impeller and pipeline of the pump. Once blockage occurs, it will cause the flow of the pump to decrease, the pressure to increase, and even the motor of the pump to be damaged. For example, when treating the activated sludge produced by the treatment of industrial wastewater containing a large amount of fibers, the fibers are easy to wrap around the impeller of the pump, which needs to be cleaned frequently to ensure the normal operation of the pump;

[0015] 3.2) Component wear: The components of the sludge lifting pump, such as the impeller and the pump shell, will be worn during long-term contact with the sludge and operation. Especially when the sludge contains high-hardness particulate matter (such as sand particles), the wear will be more serious. Component wear not only reduces the efficiency of the pump, but also may cause problems such as pump leakage. For example, the gap between the worn impeller and the pump shell increases, which will reduce the conveying capacity of the pump and increase the cost of maintenance and replacement of components;

[0016] 3.3) Energy consumption problem: sludge lifting pump usually needs to consume electric energy to run. When the concentration of sludge is high, the viscosity is large, or the operation condition of the pump is unreasonable (such as the lift is too high, the flow is too large, etc.), the energy consumption of the pump will increase significantly. Moreover, as the pump parts wear and performance decline, more energy may be consumed to achieve the same lifting effect. This will increase the operation cost of sewage treatment in the long run. Practical new content

[0017] In view of the defects in the prior art, the purpose of the present application is to provide a residual sludge unpowered lifting and discharging application system for sewage treatment plants, which can reduce energy dependence and consumption, and save the power consumption energy of sewage treatment plants, that is, the maintenance and operation cost.

[0018] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0019] A residual sludge unpowered lifting and discharging application system for sewage treatment plants, comprising a sludge high-level tank, a sludge distribution tank and a sludge thickening tank, the sludge high-level tank is communicated with the sludge distribution tank through a lifting pump and a sludge discharge pipe, and the sludge distribution tank is communicated with the sludge thickening tank through a thickening tank feed pipe;

[0020] A fluid accumulator is arranged on the sludge high-level tank;

[0021] An upper suction pipe, a feed hose, an exhaust pipe and a discharge pipe are arranged on the fluid accumulator;

[0022] The upper suction pipe is communicated with the sludge high-level tank;

[0023] The feed hose is communicated with the sludge discharge pipe;

[0024] The discharge pipe is communicated with the sludge distribution tank.

[0025] Preferably, the upper suction pipe is communicated with the fluid accumulator through a pipe compensator and a feed special-shaped variable diameter joint.

[0026] Preferably, both ends of the feed hose are communicated with the fluid accumulator and the discharge pipe through quick connectors.

[0027] Preferably, two feed valves are arranged on the feed hose, one of which is arranged close to the discharge pipe, and the other is arranged close to the fluid accumulator.

[0028] Preferably, an exhaust valve is arranged on the exhaust pipe.

[0029] Preferably, the medium inlet side of the discharge pipe is communicated with the fluid accumulator through a discharge special-shaped variable diameter joint.

[0030] The medium outlet side of the discharge pipe is provided with a speed-increasing reverse gas component.

[0031] Preferably, the discharge pipe is sequentially provided with a fluid sludge sight glass, a flow meter, and a discharge quick-opening valve along the medium flow direction.

[0032] Preferably, the fluid accumulator is provided with a sludge level meter.

[0033] Preferably, the sludge discharge pipe is provided with a sludge on-off valve.

[0034] The thickening tank feed pipe is provided with a thickening tank feed valve.

[0035] Preferably, the discharge pipe adopts an S-shaped structure.

[0036] The residual sludge unpowered lifting and discharging application system for a sewage treatment plant has the following beneficial effects:

[0037] 1) Energy saving and consumption reduction, which can effectively reduce the operation cost in the sewage treatment process;

[0038] 2) Small damage to sludge flocs, which can better maintain the integrity of sludge flocs, ensure that the activated sludge maintains good settling performance in the subsequent treatment process, and improve the treatment effect;

[0039] 3) Convenient maintenance and management, which reduces the maintenance workload and cost of the equipment, and the service life of the equipment is relatively long;

[0040] 4) Avoiding the backflow of supernatant, which not only avoids the waste of energy consumption of the backflow pump, but also ensures the concentration of backflow sludge, and creates favorable conditions for the normal operation of the biochemical process;

[0041] 5) Small operation noise, which has small noise during equipment operation and will not cause large noise pollution, and is particularly suitable for places with strict requirements on environmental noise, such as residential areas around urban sewage treatment plants;

[0042] 6) Enhancing sludge activity, which can increase the oxygen content in the sludge through the disturbance and descending flow mixing of the activated sludge by vacuum suction, and then increase the activity of the sludge, which is beneficial to improve the subsequent sewage treatment effect;

[0043] 7) Strong continuous operation capability, which can realize continuous operation, can timely discharge the activated sludge at the bottom of the sedimentation tank, avoid the accumulation of sludge at the bottom of the tank, and ensure the stable operation of the sewage treatment system;

[0044] 8) The application range is wide, liquid level difference meets the requirement of vacuum degree, through ingenious device design and manufacture, it is suitable for sludge storage pool, sedimentation tank and concentration tank with various depths and has good applicability for sewage treatment systems with different scales. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a structural schematic diagram of the residual sludge unpowered lifting and discharging application system. DETAILED DESCRIPTION

[0046] In order to better understand the above technical scheme of the utility model, the technical scheme of the utility model is further explained below in combination with the drawings and embodiments.

[0047] In combination with Figure 1 As shown in the figure, the utility model provides a residual sludge unpowered lifting and discharging application system for a sewage treatment plant, which comprises a sludge high-level well 1, a sludge distribution well 2 and a sludge concentration tank 3, the sludge high-level well 1 is communicated with the sludge distribution well 2 through a lifting pump 4 and a sludge discharging pipe 5, and the sludge distribution well 2 is communicated with the sludge concentration tank 3 through a concentration tank feeding pipe 6.

[0048] A fluid accumulator 7 is arranged on the sludge high-level well 1.

[0049] An upper suction pipe 8, a feeding hose 9, an exhaust pipe 10 and a discharging pipe 11 are arranged on the fluid accumulator 7.

[0050] The medium inlet side of the upper suction pipe 8 is inserted into the sludge high-level well 2 and communicated with the sludge high-level well 2.

[0051] The feeding hose 9 is communicated with the sludge discharging pipe 5.

[0052] The discharging pipe 11 is communicated with the sludge distribution well 2.

[0053] The medium outlet side of the upper suction pipe 8 is communicated with the fluid accumulator 7 through a pipeline compensator 12 and a feeding special-shaped variable-diameter joint 13.

[0054] Both ends of the feeding hose 9 are communicated with the fluid accumulator 7 and the discharging pipe 5 through quick connectors 14.

[0055] Two feeding valves 15 are further arranged on the feeding hose 9, one of the feeding valves 15 is arranged close to the discharging pipe 5, and the other feeding valve 15 is arranged close to the fluid accumulator 7.

[0056] An exhaust valve 16 is arranged on the exhaust pipe 10.

[0057] The medium inlet side of the discharging pipe 11 is communicated with the fluid accumulator 7 through a discharging special-shaped variable-diameter joint 17.

[0058] A speed-increasing reverse gas member 18 is arranged on the medium outlet side of the discharge pipe 11.

[0059] A fluid sludge sight glass 19, a flow meter 20 and a discharge quick-opening valve 21 are sequentially arranged on the discharge pipe 11 along the medium flow direction.

[0060] A sludge level meter 22 is further arranged on the fluid accumulator 7.

[0061] A sludge switch valve 23 is further arranged on the sludge discharge pipe 5.

[0062] A thickening tank feed valve 24 is further arranged on the thickening tank feed pipe 6.

[0063] The working process of the application system for the residual sludge unpowered lifting and discharging is as follows:

[0064] 1) In the preparation stage before starting, firstly, the activated sludge enters the sludge high tank 1 through the residual sludge feed port 25 to reach the working liquid level (4.5 m), and part of the residual sludge is returned to the front-end anoxic tank of the system through the outer return sludge discharge port on the side wall of the sludge high tank 1 to complete the supply of the activated sludge system concentration. The other residual sludge to be discharged needs to be lifted and transmitted to the next structure for treatment.

[0065] The application needs to fill the fluid accumulator 7 with residual sludge before starting, and the filling process is as follows:

[0066] The discharge quick-opening valve 21 on the fluid accumulator 7 is closed, the exhaust valve 16 on the exhaust pipe 10 is opened, the sludge switch valve 23 on the sludge discharge pipe 5 is closed, and the two feed valves 15 on the feed hose 9 are opened. At this time, the lifting pump 4 is started, the residual sludge in the sludge high tank 1 enters the fluid accumulator 7 through the feed hose 9, and when the fluid accumulator 7 is full, the activated sludge will be guided into the sludge distribution tank 2 from the exhaust pipe 10 on the fluid accumulator 7. At this time, the fluid accumulator 7 has completed the first material flushing, and the lifting pump 4 needs to be closed, and the two feed valves 15 on the feed hose 9 and the exhaust valve 16 on the exhaust pipe 10 are closed. The sludge level meter 22 installed on the fluid accumulator 7 is observed to confirm whether it is full and whether it has the starting condition.

[0067] The thickening tank feed valve 24 on the thickening tank feed pipe 6 is opened to keep the sludge high tank 1 unobstructed to the subsequent sludge thickening tank 3.

[0068] 2) In the starting operation stage of the application, the discharge quick-opening valve 21 on the fluid accumulator 7 is opened, and at this time, the activated sludge in the fluid accumulator 7 first flows through the discharge special-shaped reducing connector 17 under the action of potential energy, and then sequentially flows through the fluid sludge sight glass 19 and the flow meter 20, and finally flows along the discharge pipe 11 on the fluid accumulator 7 to be discharged to the sludge distribution tank 2 from the speed-increasing reverse gas member 18.

[0069] 3) The normal working stage of the utility model, with the activated sludge in the fluid accumulator 7 being gradually discharged from the speed-increasing reverse air member 18, the inside of the fluid accumulator 7 presents a vacuum state, when the atmospheric pressure reaches-18Kpa, the activated sludge in the sludge elevated well 1 is under the action of atmospheric pressure and enters the fluid accumulator 7 through the upper suction pipe 8 according to the Torricelli experiment principle, since the activated sludge is a viscous fluid, continuously discharged from the fluid accumulator 7, the activated sludge in the sludge elevated well 1 is continuously sucked into the fluid accumulator 7 by the upper suction pipe 8 under the vacuum action of the inside of the fluid accumulator 7, thereby forming one-dimensional flow of fluid, so the whole process is continuous, thereby realizing the transmission of activated sludge to the next structure facility under the action of not increasing external force, that is, the goal of power-free discharge of residual sludge.

[0070] 4) The flow monitoring and temperature adjustment and conveying stage, in the operation process of the utility model, the operator can transcribe the data of the fluid sludge sight glass 19 every day, and count the sludge transmission amount, if fine adjustment of flow is needed, then fine flow adjustment is conducted by adjusting the opening degree of the discharging quick-opening valve 21 on the fluid accumulator 7, if large-scale flow adjustment is needed, then the speed-increasing reverse air member 18 of the corresponding caliber is replaced according to the required flow, so as to achieve the purpose of ideal transmission flow.

[0071] In the application system of the utility model, the pipe diameter of the thickener feed pipe 6 is 300mm, the elevation between the top of the thickener feed pipe 6 and the top of the sludge thickener 3 is 1.7m, and the elevation between the bottom of the thickener feed pipe 6 and the bottom of the sludge thickener 3 is 2.0m.

[0072] The relative elevation of the top of the sludge thickener 3 is 4.5m, so the working liquid level in the sludge elevated well 1 is 4.3m, and the height difference between the working liquid level in the sludge elevated well 1 and the bottom of the sludge thickener 3 is 1.8m.

[0073] The highest point of the fluid accumulator 7 is 1.5m from the top of the sludge thickener 3, so the vertical height of the upper suction pipe 8 is 1.8m.

[0074] The application system can effectively avoid mechanical damage of activated sludge in the transmission process, protect microbial activity, reduce damage to microbial flocculation, is conducive to maintaining the function of microorganisms in the subsequent sewage treatment process, maintains stable sludge structure, and ensures stable operation of the sewage treatment system.

[0075] The application system can improve the stability and controllability of the activated sludge conveying process, and optimize the treatment process.

[0076] 1) Stable activated sludge conveying process: the non-powered sludge discharge device can continuously and stably convey activated sludge as long as the liquid level difference remains stable and the pipeline is not damaged after being started. This stable conveying mode can ensure that the flow and flow rate of sludge in the sewage treatment system are relatively stable, and avoids fluctuations in the sewage treatment process caused by unstable conveying equipment. For example, in the sludge reflux process, stable sludge reflux can provide a stable amount of microorganisms for the biological reaction tank, which helps to improve the efficiency and quality of sewage treatment.

[0077] 2) Controllable Delivery Flow: By rationally designing the components of the non-powered sludge discharge system, such as pipe diameter, length, and liquid level differential, the activated sludge delivery flow rate can be controlled to a certain extent. This allows operators to flexibly adjust the sludge delivery rate based on the actual needs of the sewage treatment process and optimize the treatment process. For example, at different sewage treatment stages, the sludge delivery rate can be controlled by adjusting the parameters of the non-powered sludge discharge system according to changes in water quality and sludge concentration to achieve the best treatment results.

[0078] Furthermore, the operating principle of the present invention's unpowered excess sludge lifting and discharge application system is based on the principles of liquid level and air pressure differential. The unpowered sludge discharge device utilizes the liquid level difference between the sludge high-level well storage tank and the sludge discharge well to generate a pressure differential, creating a siphon effect, thereby causing the activated sludge to flow through the pipeline. This method requires no additional power drive and relies solely on natural physical principles for continuous operation, saving energy consumption. Unlike traditional sludge lifting pumps, the unpowered sludge discharge device lacks mechanical power components such as impellers and motors, with only a single core component: the accumulator. This reduces the risk of failure and maintenance costs associated with mechanical motion. The entire system, from energy storage, upward extraction, and material descent, requires a comprehensive design and layout of the pipe shape, diameter, diameter change, and speed-increasing reverse components, taking into account the concentration, viscosity, and rheological properties of the activated sludge. The fluid accumulator utilizes a special docking mechanism for the initial charge of activated sludge, ensuring the identity of the starting material and the working medium. The accumulator is equipped with conduits for exhaust and overflow sludge discharge, ensuring clean production on-site. The discharge pipe adopts a horizontal S-bend structural design and is equipped with a quick-opening valve, ensuring that operators can flexibly and safely control the startup of the system without entering a confined space.

[0079] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A system for the unpowered lifting and discharge of excess sludge in a sewage treatment plant, comprising a sludge high-level well, a sludge distribution well, and a sludge thickening tank. The sludge high-level well is connected to the sludge distribution well via a lifting pump and a sludge discharge pipe, and the sludge distribution well is connected to the sludge thickening tank via a thickening tank feed pipe. The system is characterized by: The sludge high-level well is provided with a fluid accumulator; The fluid accumulator is provided with an upper suction pipe, a feed hose, an exhaust pipe and a discharge pipe; The upper suction pipe is connected to the sludge high-level well; The feed hose is connected to the sludge discharge pipe; The discharge pipe is communicated with the sludge distribution well.

2. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1 is characterized in that: The upper suction pipe is connected to the fluid accumulator through a pipeline compensator and a feed special-shaped reducing joint.

3. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1 is characterized in that: Both ends of the feed hose are connected to the fluid accumulator and the discharge pipe through quick connectors.

4. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 3 is characterized in that: The feed hose is provided with two feed valves, one of which is located close to the discharge pipe, and the other is located close to the fluid accumulator.

5. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1 is characterized in that: An exhaust valve is provided on the exhaust pipe.

6. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1 is characterized in that: The medium inlet side of the discharge pipe is connected to the fluid accumulator through a discharge special-shaped reducer; A speed-increasing reverse gas component is provided on the medium outlet side of the discharge pipe.

7. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 6 is characterized in that: The discharge pipe is provided with a fluid sludge sight glass, a flow meter and a discharge quick-opening valve in sequence along the medium flow direction.

8. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1 is characterized in that: The fluid accumulator is provided with a sludge level meter.

9. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1, characterized in that: The sludge discharge pipe is provided with a sludge switch valve; The concentration tank feed pipe is provided with a concentration tank feed valve.

10. The unpowered excess sludge lifting and discharge application system for a sewage treatment plant according to claim 1, characterized in that: The discharge pipe adopts an S-bend structure.

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