Equipment and method for checking poisoning reasons of activated sludge in sewage treatment plant

Abstract

The invention provides equipment and a method for checking poisoning reasons of activated sludge of a sewage treatment plant. The troubleshooting equipment comprises a cylindrical nitrification tank, an annular sedimentation tank and a poison box, the annular sedimentation tank is mounted on the outer side of the cylindrical nitrification tank, three conical sludge storage hoppers are uniformly distributed at the bottom of the cylindrical nitrification tank, a sludge pipe is connected to the lower portion of the annular sedimentation tank, a ball valve is mounted on the sludge pipe, and the bottom end of the sludge pipe extends into the bottom of the cylindrical nitrification tank. The sewage treatment device is novel in structural design and convenient to operate, the self-diagnosis capability and the pollution source searching capability of a sewage plant can be greatly improved, technical guarantee is provided for stable production, and the sewage treatment device is suitable for popularization and application. And evidence is provided for a unit for stealthily discharging toxic sewage.

Description

Technical Field

[0001] The present application relates to the technical field of sludge poisoning cause investigation, and in particular to a device and method for investigating the cause of activated sludge poisoning in a sewage treatment plant. Background Art

[0002] Sewage treatment plants often experience sudden substandard sewage due to factors such as large water collection areas, many sewage discharge units in the area, and complex and changeable water quality. The general sewage treatment plants do not have the ability to trace the source of this phenomenon. Even if the cause of the impact on the sludge is clear, the sewage discharge units will not admit it because there is no strong experimental data.

[0003] Almost all sewage treatment plants do not have countermeasures in this regard. When sludge poisoning is discovered, they always look for reasons in their own operations first, such as low DO? Large water intake? Too much or too little sludge discharge? When it is confirmed that these operations are in line with process regulations, they look for other reasons. For example, heavy metals in the influent exceed the standard? Other toxic organic matter enters the system? Because of the wide range of issues involved, reports are often filed to the government for help. Generally, before the cause is found, the sludge resumes its normal activity. One of the reasons is that the detoxification unit has finished discharging the toxic wastewater, and the sewage treatment system has slowly returned to normal because there is no continuous entry of toxic substances.

[0004] We encountered two sewage treatment plants. In one plant, the dissolved oxygen in the biological pool would suddenly increase significantly, exceeding the normal operating value by 2 times, but it still could not guarantee that the effluent ammonia nitrogen would meet the standard. They recorded this phenomenon 140 times, but have not found the cause yet. They only focused on the suspect: nitrobenzene was detected in the influent. Because they could not provide strong evidence, the case was often left unresolved. The records of the other sewage treatment plant were more specific. The effluent ammonia nitrogen suddenly exceeded the standard 6 times a year, with a total of 40 records. Finally, with the coordination of relevant departments, the culprit was found: excessive cyanide. Sewage treatment plants should pay attention to the impact of toxic and harmful substances on activated sludge.

[0005] Attention. Sewage treatment plants, especially industrial park sewage plants, urgently need to have their own toxic substance screening capabilities, and it is necessary to design a sewage treatment plant activated sludge poisoning cause screening equipment. Summary of the invention

[0006] The present application provides a device and method for troubleshooting the cause of activated sludge poisoning in a sewage treatment plant, so as to solve the problem.

[0007] The present application provides a device for investigating the causes of activated sludge poisoning in a sewage treatment plant, the investigation device comprising a columnar nitrification tank, an annular sedimentation tank and a poison tank;

[0008] The annular sedimentation tank is installed outside the cylindrical nitrification tank;

[0009] Three conical mud storage hoppers are arranged at the bottom of the columnar nitrification pool, and the three conical mud storage hoppers are evenly distributed;

[0010] The lower part of the annular sedimentation tank is connected to a mud pipe, a ball valve is installed on the mud pipe, and the bottom end of the mud pipe extends into the bottom of the cylindrical nitrification tank;

[0011] It also includes a water inlet pipe, one end of which is connected to the mud pipe, and the other end of which is connected to a water source;

[0012] The discharge end of the poison box is connected to the water inlet pipe through a pipeline;

[0013] Among them, the columnar nitrification tank is used for the aeration reaction of sludge and toxic and harmful substances; the annular sedimentation tank is used to precipitate sludge water and use the precipitated sludge for subsequent reactions; the poison box is used to prepare toxic and harmful substances and react with the sludge; the device is simple to operate and has a high degree of automation, which can improve the efficiency of investigating the causes of sludge poisoning.

[0014] In a possible design, a rubber membrane aeration plate is further installed at the bottom of the inner cavity of the columnar nitrification tank, and an aeration head is installed on the rubber membrane aeration plate. The aeration head is a universal corundum rubber membrane aeration head.

[0015] In a possible design, a condensate drain pipe is also installed at the bottom of the annular sedimentation tank, and a valve is installed on the condensate drain pipe.

[0016] In a possible design, an air pipe is also included, one end of which is connected to the vortex blower, and the other end of which is connected to the condensate drain pipe.

[0017] In a possible design, it also includes a plastic measuring cylinder, which is installed on the wall of the cylindrical nitrification tank.

[0018] In a possible design, a peristaltic pump is also installed in the poison tank.

[0019] In a possible design, the height of the columnar nitrification tank is 1.4m-1.5m, and the hydraulic retention time in the columnar nitrification tank is 5-6h.

[0020] In a possible design, the volume of the three sludge hoppers accounts for 40% of the annular sedimentation tank, and the taper is 1:1.

[0021] In one possible design, the ratio of depth to width of the annular sedimentation tank is 4:1.

[0022] In one possible design, the method of use includes the following steps:

[0023] A. The sludge water from the sewage treatment plant is discharged into the annular sedimentation tank for sedimentation;

[0024] B. The precipitated sludge enters the sludge hopper below, and the ball valve on the sludge pipe is controlled to rotate, so that the sludge in the sludge hopper enters the sludge pipe;

[0025] C. The mud pipe is connected to the water inlet pipe, and the external water source enters the water inlet pipe. The Venturi phenomenon is used to maintain the negative pressure of the sludge and enter the cylindrical nitrification tank;

[0026] D. At the same time, the peristaltic pump in the poison box is controlled to work, and the peristaltic pump sends the toxic and harmful substances in the poison box into the inlet pipe and into the columnar nitrification tank to mix with the sludge;

[0027] E. Control the vortex fan to work, and the vortex fan sends external air into the cylindrical nitrification tank through the air pipe;

[0028] F. The rubber membrane aeration disk aerates the mixture;

[0029] G. Use a plastic measuring cylinder to detect the sedimentation ratio of the reactants in the cylindrical nitrification tank, and finally use a detection instrument to detect it.

[0030] Beneficial effects: The invention has novel structural design and convenient operation, which can greatly improve the sewage treatment plant's ability to self-diagnose and find pollution sources, provide technical guarantees for stable production, and provide evidence for catching units that secretly discharge toxic sewage. It avoids the drawbacks of traditional methods such as adding carbon sources, increasing dissolved oxygen, stopping water inflow or reducing water inflow. The investigation method of the invention can quickly investigate the cause of poisoning and quickly resume production.

[0031] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of the experimental device of the present invention;

[0035] Figure 3 A flowchart for troubleshooting of the present invention;

[0036] Explanation of the reference numerals: cylindrical nitrification tank 1, annular sedimentation tank 2, poison box 3, conical mud storage hopper 4, mud pipe 5, ball valve 6, water inlet pipe 7, pipeline 8, rubber membrane aeration plate 9, condensate discharge pipe 10, valve 11, air pipe 12, vortex fan 13, plastic measuring cylinder 14. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. For example, in the description of the present application, the directions or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0041] In addition, the expressions of indicated directions such as the X direction, the Y direction, and the Z direction used to illustrate the operation and construction of the components of the present embodiment are not absolute but relative, and although these indications are appropriate when the components are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0042] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0043] In the description of the present application, 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, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0045] like Figure 1 As shown, the present application provides a device for investigating the causes of activated sludge poisoning in a sewage treatment plant, the investigation device comprising a columnar nitrification tank 1, an annular sedimentation tank 2 and a poison tank 3;

[0046] The annular sedimentation tank 2 is installed outside the cylindrical nitrification tank 1;

[0047] The bottom of the columnar nitrification pool 1 is provided with three conical mud storage hoppers 4, and the three conical mud storage hoppers 4 are evenly distributed;

[0048] The lower part of the annular sedimentation tank 2 is connected to a mud pipe 5, a ball valve 6 is installed on the mud pipe 5, and the bottom end of the mud pipe 5 extends into the bottom of the cylindrical nitrification tank 1;

[0049] It also includes a water inlet pipe 7, one end of which is connected to the mud pipe 5, and the other end of which is connected to a water source;

[0050] The discharge end of the poison box 3 is connected to the water inlet pipe 7 through a pipeline 8;

[0051] Among them, the columnar nitrification tank is used for the aeration reaction of sludge and toxic and harmful substances; the annular sedimentation tank is used to precipitate sludge water and use the precipitated sludge for subsequent reactions; the poison box is used to prepare toxic and harmful substances and react with the sludge; the device is simple to operate and has a high degree of automation, which can improve the efficiency of investigating the causes of sludge poisoning.

[0052] In the present invention, a rubber membrane aeration plate 9 is also installed at the bottom of the inner cavity of the columnar nitrification tank 1, and an aeration head is installed on the rubber membrane aeration plate 9. The aeration head adopts a universal corundum rubber membrane aeration head. The use of a corundum rubber membrane aeration head can increase the aeration volume, improve the aeration uniformity, and thus improve the reactivity efficiency of sludge and toxic and harmful substances.

[0053] In the present invention, a condensate drain pipe 10 is also installed at the bottom of the annular sedimentation tank 2, and a valve 11 is installed on the condensate drain pipe 10. The condensate drain pipe can quickly drain the condensate generated during the aeration process to prevent the condensate from affecting the reactants.

[0054] The present invention further comprises an air pipe 12, one end of which is connected to a vortex fan 13, and the other end of which is connected to a condensate drain pipe 10. The vortex fan delivers external air into the cylindrical nitrification tank through the air pipe to improve aeration efficiency.

[0055] The present invention further comprises a plastic measuring cylinder 14, which is mounted on the wall of the cylindrical nitrification tank 1. The plastic measuring cylinder is used to detect the sedimentation ratio of the reactants in the cylindrical nitrification tank, and when the set sedimentation ratio is reached, the reaction is stopped, and then the detection is performed.

[0056] In the present invention, a peristaltic pump is also installed in the poison box 3. The peristaltic pump is used to evenly deliver the toxic and harmful substances prepared in the poison box into the water inlet pipe.

[0057] In the present invention, the height of the columnar nitrification pool 1 is 1.4m-1.5m, which is convenient for observation; the diameter is related to the design scale of the device, and the hydraulic retention time of water in the columnar nitrification pool 1 is 5-6h.

[0058] In the present invention, the volume of the three mud hoppers 4 accounts for 40% of the annular sedimentation tank, and the taper is 1:1; the ratio of the depth to the width of the annular sedimentation tank 2 is 4:1. This structure can improve the sedimentation effect.

[0059] like Figure 3 As shown, working principle: the method of using the present invention comprises the following steps:

[0060] A. The sludge water from the sewage treatment plant is discharged into the annular sedimentation tank for sedimentation;

[0061] B. The precipitated sludge enters the sludge hopper below, and the ball valve on the sludge pipe is controlled to rotate, so that the sludge in the sludge hopper enters the sludge pipe;

[0062] C. The mud pipe is connected to the water inlet pipe, and the external water source enters the water inlet pipe. The Venturi phenomenon is used to maintain the negative pressure of the sludge and enter the cylindrical nitrification tank;

[0063] D. At the same time, the peristaltic pump in the poison box is controlled to work, and the peristaltic pump sends the toxic and harmful substances in the poison box into the inlet pipe and into the columnar nitrification tank to mix with the sludge;

[0064] E. Control the vortex fan to work, and the vortex fan sends external air into the cylindrical nitrification tank through the air pipe;

[0065] F. The rubber membrane aeration disk aerates the mixture;

[0066] G. Use a plastic measuring cylinder to detect the sedimentation ratio of the reactants in the cylindrical nitrification tank, and finally use a detection instrument to detect it.

[0067] Experimental example:

[0068] like Figure 2 As shown, the effect of trivalent chromium on sludge activity was verified.

[0069] First, prepare the trivalent chromium solution: use a 10ml large pipette to take 5ml of 0.2500mol potassium dichromate solution and transfer it to a 1000ml volumetric flask; then use a 50ml large pipette to take 50ml of 0.1000mol / l ammonium ferrous sulfate solution prepared in the laboratory and transfer it to the above 1000ml volumetric flask, add about 100ml of water, and shake the volumetric flask. After a few seconds, the color of the solution turns emerald green, and water is added to the 1000ml mark. The concentration of trivalent chromium in this solution is 43.34mg / l.

[0070] After that, the activated sludge was sampled. At the end of the aerobic section of the biological pool, 20 liters of uniform mud-water mixed sample was taken. At the water inlet, 50 liters of water sample was taken from the aerated grit chamber for standby use. Aeration was carried out using a micro aerator.

[0071] The water inlet flow rate is controlled at 3.5 liters / h by a peristaltic pump;

[0072] Among them, the sedimentation tank has a capacity of 30 liters. If the sedimentation effect is not good, filter paper is used for filtration;

[0073] The flow rate of trivalent chromium solution was controlled to 35 ml / h.

[0074] The experimental results are shown in the following table:

[0075] Time Sedimentation ratio% Effluent ammonia nitrogen mg / I Outlet CODmg / I Remark 0 45 0.52 28.3 2 42 1.25 32.0 4 54 5.14 31.5 6 60 18.7 29.4 Loose sludge 8 65 22.6 35.9 Loose sludge 10 62 31.5 38.2 Loose sludge 12 68 30.9 32.1 Sludge turns black 14 65 32.1 36.6 Sludge turns black

[0076] Experimental results: Influent ammonia nitrogen = 34.5 mg / l COD = 135 mg / l MLSS = 4300 mg / l.

[0077] From the above experiments, we can see that trivalent chromium has a very fast inactivation effect on nitrifying bacteria in activated sludge, causing the effluent ammonia nitrogen to rise rapidly. Plotting the trend of the increase in effluent ammonia nitrogen can be used as direct evidence of the effect of trivalent chromium on nitrifying bacteria and can be preserved.

[0078] The effect of trivalent chromium on bacterial flocs is relatively limited, and the continuous impact will also cause the bacterial flocs to disintegrate, thereby affecting the COD value of the effluent.

[0079] In summary, the present invention has novel structural design and convenient operation, which can greatly improve the sewage treatment plant's ability to self-diagnose and find pollution sources, provide technical guarantees for stable production, and provide evidence for catching units that secretly discharge toxic sewage. It avoids the drawbacks of traditional methods such as adding carbon sources, increasing dissolved oxygen, stopping water inflow or reducing water inflow. The investigation method of the present invention can quickly investigate the cause of poisoning and quickly resume production.

[0080] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for investigating the causes of activated sludge poisoning in a sewage treatment plant, characterized in that: The inspection equipment includes a columnar nitrification tank (1), an annular sedimentation tank (2) and a poison tank (3); The annular sedimentation tank (2) is installed outside the cylindrical nitrification tank (1); The columnar nitrification pool (1) is provided with three conical mud storage hoppers (4) at the bottom, and the three conical mud storage hoppers (4) are evenly distributed; The lower part of the annular sedimentation tank (2) is connected to a mud pipe (5), a ball valve (6) is installed on the mud pipe (5), and the bottom end of the mud pipe (5) extends into the bottom of the cylindrical nitrification tank (1); It also includes a water inlet pipe (7), one end of which is in communication with the mud pipe (5), and the other end of which is connected to a water source; The discharge end of the poison box (3) is connected to the water inlet pipe (7) via a pipeline (8).

2. The device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: A rubber membrane aeration plate (9) is also installed at the bottom of the inner cavity of the columnar nitrification tank (1), and an aeration head is installed on the rubber membrane aeration plate (9). The aeration head adopts a universal corundum rubber membrane aeration head.

3. The device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: A condensate drain pipe (10) is also installed at the bottom of the annular sedimentation tank (2), and a valve (11) is installed on the condensate drain pipe (10).

4. The device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 3 is characterized in that: It also comprises an air pipe (12), one end of the air pipe (12) being connected to the vortex fan (13), and the other end of the air pipe (12) being connected to the condensate drain pipe (10).

5. The device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: It also comprises a plastic measuring cylinder (14), wherein the plastic measuring cylinder (14) is installed on the wall of the columnar nitrification tank (1).

6. The device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: A peristaltic pump is also installed in the poison box (3).

7. A device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: The height of the columnar nitrification tank (1) is 1.4m-1.5m, and the hydraulic retention time in the columnar nitrification tank (1) is 5-6h.

8. A device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: The volume of the three mud storage hoppers (4) accounts for 40% of the annular sedimentation tank, and the taper is 1:

1.

9. A device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: The ratio of depth to width of the annular sedimentation tank (2) is 4:

1.

10. A method for using a device for investigating the cause of activated sludge poisoning in a sewage treatment plant according to claim 1, characterized in that: The method of use includes the following steps: A. The sludge water from the sewage treatment plant is discharged into the annular sedimentation tank for sedimentation; B. The precipitated sludge enters the sludge hopper below, and the ball valve on the sludge pipe is controlled to rotate, so that the sludge in the sludge hopper enters the sludge pipe; C. The mud pipe is connected to the water inlet pipe, and the external water source enters the water inlet pipe. The Venturi phenomenon is used to maintain the negative pressure of the sludge and enter the cylindrical nitrification tank; D. At the same time, the peristaltic pump in the poison box is controlled to work, and the peristaltic pump sends the toxic and harmful substances in the poison box into the inlet pipe and into the columnar nitrification tank to mix with the sludge; E. Control the vortex fan to work, and the vortex fan sends external air into the cylindrical nitrification tank through the air pipe; F. The rubber membrane aeration disk aerates the mixture; G. Use a plastic measuring cylinder to detect the sedimentation ratio of the reactants in the cylindrical nitrification tank, and finally use a detection instrument to detect it.

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